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AVDC100 Audio/Video Delay Corrector User Manual - lip

1. CH 1 2 out CH 3 4 in AM70 o T64 Digital Audio Generator Digital Audio Monitor Digital out CH 1 2 in CH 3 4 out Figure D 3 Initial equipment connections for the enhanced functional tests 3 On the AM70 digital audio signal generator set the controls as follows to output a 1000 Hz 500 ms tone burst signal that is repeated every 3 seconds a Press the GEN key to set the AM70 to generator mode b Press the MENU key and then select F1 c Use the up and down arrow keys to set the output signal to BURST d Use the left and right arrow buttons to set the frequency of the burst to 1000 Hz and then press ENTER e Press the MENU key and then select F2 f Use the number keys to enter 03000 3000 ms as the period of repetition and then press ENTER Press the MENU key and then select F3 h Use the number keys to enter 00500 500 ms as the burst width and then press ENTER D 24 AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification 4 On the 764 digital audio monitor set the controls as follows a b Press the MENU button to display the Top menu Use the multi function knob to highlight the Level Meters submenu and then press any soft button to open the menu Set the following parameters in the Level Meters submenu m Display mode 4 Channels Interpolation ON m Ballistics True Peak Return to the Top menu by pressing the associated soft
2. 10 BASE T U seRIAL VIDEO U para AUDIO Figure 2 8 AVDC100 rear panel connectors 2 30 AVDC100 Audio Video Delay Corrector User Manual Operating Basics Table 2 13 Functional requirements of the rear panel connectors Serial Video In 525 line 625 line 270Mbit sec BNC component serial video input SMPTE 259M compliant NOTE A valid SDI video signal input is required for the instrument to properly set itself for 525 line or 625 line measurements Serial Video Out 525 line 625 line 270Mbit sec BNC component serial video output SMPTE 259M compliant Digital Audio In Digital AES coax stereo input BNC AES3 ID 48 kHz 24 bit NOTE For A V delay measurements the audio signal must be a valid digital audio signal and should contain typical speech and action audio material where sound to action timing errors can be most visible Digital Audio Out Digital AES coax stereo output 48 kHz 24 bit BNC AES3 D os LTC Time Code SMPTE Longitudinal Time Code input female XLR an LAN Ethernet 10 Base T Ethernet interface RJ 45 RS 232 RS 232 interface DCE DB 9 Power Power mains 100 240 V 50 60 Hz Function Encode mode To provide video input that you want to be watermarked for A V delay measurement or source ID Decode mode To provide watermarked video input to be decoded later for A V delay measurement or for determining the source ID Bypa
3. ING NUT CLIP ON WITH CAPTIVE NUT AVDC100 Audio Video Delay Corrector User Manual Installation Figure 1 3 Installing the single instrument rackmount hardware AVDC100 Audio Video Delay Corrector User Manual 1 9 Installation Single Instrument Rackmount Installation Perform the following steps to install an AVDC100 instrument into an equipment rack using the single instrument rackmount hardware NOTE The numbers listed in brackets X in the following procedure refer to the parts supplied in the single rackmount kit The numbers correspond to the item numbers listed in Table 1 3 on page 1 8 and shown in Figure 1 3 on page 1 9 Refer to Figure 1 3 as needed to correctly identify and orient the parts during assembly 1 Install the support bracket 2 on the left side of the instrument using three screws 5 This bracket has a hole in the end facing the front of the instrument See Figure 1 3 2 Install the support bracket 3 on the right side of the instrument using three screws 5 NOTE You will need to measure the depth of your equipment rack to determine which of the slots in the brackets 1 to use for mounting 3 Install a bracket 1 on both sides of the instrument rackmount assembly using two screws 4 for each bracket total of four screws Do not tighten the screws The ear of each bracket should face the rear of the instrument as shown in Figure 1 3 4 Position the in
4. cc cece ecw eee eens Table A 6 Control and Data ports cece eee were eens Table A 7 AC power source characteristics eeeeee Table A 8 Mechanical characteristics 0c eee eeeeeee Table A 9 Environmental characteristics 0e000 Table A 10 EMC certifications and compliances Table A 11 Safety certification and compliance Table B 1 Definition of the MIB objects for SNMP remote control Table B 2 SNMP trap descriptions cece eeeeeeees Table C 1 Troubleshooting power on failures Table C 2 Types of firmware upgrade errors 2 005 Table D 1 Required equipment list for performance verification 1 5 1 6 1 8 2 6 2 11 2 12 2 13 2 15 2 16 2 17 2 19 2 20 2 21 2 23 2 29 2 31 A 1 A 1 A 3 A 5 A 6 A 6 A 6 A 7 A 7 A 8 A 9 B 7 B 11 C 4 C 12 D 3 AVDC100 Audio Video Delay Corrector User Manual SSS eee General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Only qualified personnel should perform service procedures To Avoid Fire or Use Proper Power Cord Use only the power cord specified for this product and Personal Injury certified for the country of use Ground the Product This product is grounded through the grounding conduc
5. Set the following parameters in the Headphones submenu Manual Left Channel 3 Manual Right Channel 4 Return to the Top menu by pressing the associated soft button Use the multi function knob to highlight the Input submenu and then press any soft button to open the menu Set the following parameters in the Input submenu m CH 1 2 input BNC unbalanced m CH 3 4 input BNC unbalanced AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification m Press the Clear Menu button to clear the menu display n Select the following front panel control settings m View Audio m Meter Scale Normal m Phase Display A 5 On the WFM601M digital video monitor set the controls as follows a b C Set the input channel to be Serial A Set the display mode to Eye Set the sweep rate to Line 6 On the SDI video cable clone set the switches for 0 meters zero of passive delay All of the delay switches will be in the OUT position 7 On the DUT AVDC100 set the controls as listed below a b Set the instrument to Bypass mode using the Mode button Press the CONFIG button to open the Configuration menu Use the arrow buttons to select 2 DECODER c Default Audio Delay and then press the Select button Use the arrow buttons to set the default audio delay to 0 Fields and then press the Select button Use the arrow buttons to select 2 DECODER a Delay Correction and then
6. The tables in this appendix list the performance characteristics of the Tektronix AVDC100 A V Delay Corrector instrument Performance Conditions The performance characteristics listed in the following tables are typical within the environmental limits if the instrument was adjusted at 25 C 5 C and you allowed a minimum warm up time of 20 minutes Platform Characteristics Table A 1 Platform characteristics Characteristic Description Display Two line 20 characters per line vacuum fluorescent Loss of power Full instrument operation recovered in lt 10 seconds All static setup parameters active before the power failure will be automatically restored After power recovery the SNMP Trap Address will be notified that the instrument has rebooted Watermark and A V Delay Correction Characteristics Table A 2 Watermark and A V delay correction characteristics Characteristic Supplemental information Watermark Signal Inserted in Encode mode only Encodes the watermark pattern whether or not the A V delay data or the source ID data is included AN Delay Data Inserted when the audio signal associated with the video signal is input to the instrument Source ID Data DI Inserted unless the source ID function is turned off menu selection Insertion Starting Point Vertical Line 23 for 525 line signals Will not interfere with existing test signals that may Line 24 for 625 line signals occupy these lines Horizontal The nomina
7. 90 fields of default or manual delay Figure 3 4 Examples of the possible audio correlation conditions AVDC100 Audio Video Delay Corrector User Manual Reference Configuring the Instrument to Correct AN Delay If you suspect that your video program is experiencing lip sync errors perform the following steps to adjust the instrument so that you can correct the A V delay in your program NOTE This procedure assumes that your audio signal is advanced less than 30 video fields relative to the video signal and that your video signal was previously watermarked by another AVDC100 1 Connect the video and audio signals of your digital video program to the instrument inputs 2 Set the instrument to Decode mode using the Mode menu 3 Set the instrument to manual delay correction mode Use the Configuration menu 2 Decoder a Delay Correction setting NOTE It is recommended that you configure the instrument for manual delay correction when you attempt to initially setup the instrument for proper A V delay measurement and correction If you use the automatic correction mode for initial instrument setup you will have to contend with the instrument automatically trying to correct the A V delay as you are attempting to set the fixed delay 4 Set the manual audio delay to 0 fields Use the Configuration menu 2 Decoder d Manual Delay setting 5 Set the automatic correction range to be 30 fields Use the Conf
8. 2 12 Power characteristics A 6 Power connection 1 11 Power cords 1 5 Preventive maintenance C 2 cleaning C 1 Primary applications 1 4 Problems Common network B 16 LEDs or display C 4 Product description 1 1 Product support contact information ix R Rackmount installation 1 8 Readout displays Bypass mode 2 9 Decode mode 2 5 Encode mode 2 4 Rear panel connections 2 30 Rear panel connectors 1 11 Reboot the instrument 2 25 Reference card viii Related documents viii Remote control B 1 Remote control configuration 2 19 Repackaging for shipment C 2 C 12 Restore or save settings 2 22 S Safety certifications A 9 Save and restore settings 2 22 Select button 2 3 Serial port configuration 2 20 Service support contact information ix Service user Preventive maintenance C 2 Shipping instructions C 2 Signal connections 1 11 2 30 Signal generation zone plates 2 14 SNMP Glossary 1 SNMP access 2 19 B 4 SNMP agent B 1 Glossary 1 SNMP MIB B 6 SNMP reference information B 6 AVDC100 Audio Video Delay Corrector User Manual Source ID 2 16 Source ID display sequence 2 8 Specifications A 1 Stand alone installation 1 7 Standard accessories 1 6 Status AES receiver 2 10 Audio signal 2 12 SDI deserializer 2 11 SDI receiver 2 11 Time Code receiver 2 11 Watermark signal 2 12 Status button 2 3 Status LEDs 2 29 Status menu 2 10 2 26 Subnet mask 2 22 2 24 B 3 Incor
9. 3 10 3 11 3 13 3 15 3 16 3 17 3 18 B 13 B 14 B 15 B 16 B 17 B 18 D 15 D 24 Table of Contents List of Tables Table 1 1 Power cord identification ccc cece eee ewes Table 1 2 Standard and optional accessories 00 Table 1 3 Parts list for the single instrument rackmount hardware Table 2 1 Error messages in Decoder mode 0 00 Table 2 2 SDI Deserializer status messages e00005 Table 2 3 Watermark signal status messages 000 Table 2 4 Test menu Toggle selections eeeeeeeeee Table 2 5 Test menu Initiate Test selections 6 Table 2 6 Encoder configuration settings eeeee0 Table 2 7 Decoder configuration settings eeeee Table 2 8 Remote Control configuration settings Table 2 9 Serial Port configuration settings Table 2 10 Network configuration settings Configuration menu Table 2 11 Network configuration settings Boot menu Table 2 12 Decoding the status LEDs 0 cece eeeee Table 2 13 Functional requirements of the rear panel connectors Table A 1 Platform characteristics 0 cece eee eee eee Table A 2 Watermark and A V delay correction characteristics Table A 3 Serial Video port 2 0 cc cece cece cece renee Table A 4 Digital Audio port ccc cece cece cree eee Table A 5 LTC Time Code port
10. A valid SDI video stream input is required for the instrument to properly set itself for 525 line or 625 line measurements c TRS Present TRS Present is displayed when the SDI deserializer detects a TRS TRS Not Present in the video input signal TRS Not Present is displayed when the SDI deserializer cannot detect a TRS in the video input signal d EDH Present EDH Present is displayed when the SDI deserializer detects an EDH EDH Not Present in the video input signal EDH Not Present is displayed when the SDI deserializer cannot detect an EDH in the video input signal AVDC100 Audio Video Delay Corrector User Manual 2 11 Operating Basics 5 Watermark Signal Use this Status menu selection to display the status of the watermark signal Table 2 3 describes the various elements of the watermark status display Table 2 3 Watermark signal status messages Message element H xx GI 525 625 Description Lists the horizontal pixel number location in the video signal where the watermark signal insertion starts The nominal value is 15 When in Decode mode it is normal for this number to occasionally change NOTE The watermark position display is intended to verify the performance of the instrument It is not intended to be an accurate measure of actual video position shift or distortion Lists the vertical television line number location in the video signal where the watermark signal insertion starts The nominal valu
11. An example follows On the digital video generator change the signal format to 525 line This brief style assumes the operator knows how to operate the equipment in the example case the digital video generator and can set it properly If you need to refer to the appropriate initial setup procedure to familiarize yourself with setting the test equipment controls These procedures provide the path to the menu locations on the AVDC100 when you need to make a setting change An example follows On the REF AVDC100 set the watermark signal intensity to level 1 Use the Configuration menu 1 ENCODER d Set WM Intensity setting This brief style assumes the operator knows how to navigate to the menu selections that is shown This example directs the operator to perform the following steps to set the watermark intensity level 1 Press the CONFIG button to open the Configuration menu 2 Use the up down arrow buttons to display 1 Encoder 3 Use the left right arrow buttons to display d Set WM Intensity and then press the Select button 4 Use the left right arrow buttons to display Set WM Intensity To WM Level 1 and then press the Select button AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Required Test Equipment Table D 1 lists the test equipment required to perform these verification procedures including equipment examples and minimum requirements where applicable Your substi
12. Data word 01001100 Modulated by image mask _ ft NS was Encoded image sequence gt 57 I be A 2 EA an aA ar 3D holographic sequence only parts of some _ ofthe images are necessary to completely detect the 8 bit data symbol without error Figure 3 1 Intra video data channel technology diagram After each of the watermark patterns is created to represent the 8 bit word the eight patterns are summed into a single master pattern which is then passed through a modulation mask The modulation mask determines the location in the video signal where it can best hide the watermark The best locations are more in the high frequency and bright luminance regions of the video and less in the low frequency and dark luminance regions The digital watermark is spread throughout the video frame The subliminal data channel is created in the video signal at 8 bits per video frame and 30 frames per second in 525 line systems 25 frames per second for 625 line systems This equates to a baud rate of about 240 but the actual rate varies as the instrument processes the video and audio signals The watermark pattern used by the AVDC100 is 3D and holographic The term 3D refers to the fact that the data payload encoded in the watermark pattern is spread through many video frames like a deck of cards The watermark pattern is holographic because the entire data payload encoded in the watermark data channel may be recovered with as
13. or directly to a PC using a Ethernet crossover cable 2 Open a DOS window on the PC and type the following command to display the current IP subnet mask and gateway addresses for the PC ipconfig 3 Use the 1 NETWORK a Config Mode selection in the Boot menu to set the AVDC100 to Manual network configuration mode 4 Use the 1 NETWORK c Subnet Mask selection in the Boot menu to set the AVDC100 subnet mask to be the same as the PC 5 Use the 1 NETWORK b IP Address selection in the Boot menu to set the IP address of the AVDC100 to be the same as the PC except change the last number by adding or subtracting 1 For example if the IP address of the PC is 192 168 1 12 then you should set the IP address of the AVDC100 to 192 168 1 11 or to 192 168 1 13 CAUTION To prevent network communication problems do not set the last number of the IP address for the AVDC100 to 0 or to 255 6 Use the 1 NETWORK d Gateway selection in the Boot menu to set the gateway address of the AVDC100 to be the same as the PC AVDC100 Audio Video Delay Corrector User Manual Appendix C User Service Upgrading the Instrument Perform the following procedure to transfer the firmware upgrade data file from Firmware the PC to the AVDC100 1 On the PC double click the transfer exe file icon to run the transfer utility NOTE The data transfer program will first look for the firmware pkg file and will quit if the file is not
14. page B 12 If you suspect that a front panel Status LED is not working properly perform the following steps to verify the complete operation of the status LEDs 1 Press the Test button to display the Test menu 2 Use the Arrow buttons to display 3 INITIATE TEST a LEDs Normal and then press the Select button 3 Continue to press the Select button to step the LED display through the following states all green all yellow and all red AVDC100 Audio Video Delay Corrector User Manual Appendix C User Service If you suspect that the front panel display module is not working properly perform the following steps to verify the operation of the display module 1 Press the Test button to display the Test menu 2 Use the Arrow buttons to display 3 INITIATE TEST b Display Pixels and then press the Select button 3 All of the display module pixels will light Press the Select button again to turn off the display module test Firmware Upgrades The AVDC100 user can upgrade the instrument firmware to newer versions using a PC connected to the LAN Ethernet port on the instrument rear panel The firmware upgrade process involves the following steps m Downloading the firmware package ZIP file from the Tektronix website m Unzipping the firmware package and using the enclosed data transfer utility to send the new firmware data to the instrument you are upgrading m Verification of instrument operation after the firmwa
15. 800 ps Decode and Bypass modes when externally terminated in 75 Q at the Serial Video input AVDC100 Audio Video Delay Corrector User Manual Appendix A Specifications Table A 4 Digital Audio port Characteristic Input Port Connector Signal requirement Input Configurations Sample Rate Input Lock Range Signal Amplitude Return Loss Output Port Connector Output Configurations Sample Rate Signal Amplitude Return Loss Digital Stereo AES Input BNC 75 Q 48KHz 24 bit 75 2 BNC AES 3 ID 24 bit Meets requirements of SMPTE 276M 1995 AES 3 ID Decode mode 75 Q internal Encode and Bypass modes Via relay contacts to the Serial Video output Bypass mode Default mode in the event of loss of power input audio still monitored Greater than 5 0 2 Vp p to 2 Vp p gt 25 dB minimum from 0 1 MHz to 6 MHz Decode mode Internally terminated in 75 Q with respect to 75 Q Encode and Bypass modes When externally terminated in 75 Q at the Digital Audio output Meets requirements of SMPTE 276M 1995 AES 3 ID Digital Stereo AES Output BNC 75 Q Decode mode 75 Q internal Encode and Bypass modes Via relay contacts from the Digital Audio input Bypass mode Default mode in the event of loss of power Locked to Digital Audio input sample rate 48 kHz nominal 0 9 Vp p to 1 1 Vp p into 75 Q gt 25 dB minimum from 0 1 MHz to 6 MHz Decode mode Internally terminated in 75 Q w
16. AM70 to generator mode Press the MENU key and then select F1 Use the up and down arrow keys to set the output signal to BURST Use the left and right arrow buttons to set the frequency of the burst to 1000 Hz and then press ENTER Press the MENU key and then select F2 Use the number keys to enter 01150 1150 ms as the period of repetition and then press ENTER Press the MENU key and then select F3 Use the number keys to enter 00500 500 ms as the burst width and then press ENTER AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification 4 On the 764 digital audio monitor set the controls as follows a b Press the MENU button to display the Top menu Use the multi function knob to highlight the Level Meters submenu and then press any soft button to open the menu Set the following parameters in the Level Meters submenu m Display mode 4 Channels Interpolation ON m Ballistics True Peak Return to the Top menu by pressing the associated soft button Use the multi function knob to highlight the Phase Display submenu and then press any soft button to open the menu Set the following parameters in the Phase Display submenu m Format LISSAJOUS SOUND STAGE m Pair A Left channel assignment 1 m Pair A Right channel assignment 3 Return to the Top menu by pressing the associated soft button Use the multi function knob to highlight the Input submenu and then pre
17. AND TESTING EQUIPMENT a DCE 00000 P eooo mM 10 BASE T O SERIAL VIDEO U DIGITAL AUDIO OJ z Video to be later encoded or decoded Audio associated with the video input gt Feed through of audio input gt Feed through of video input gt Video output must be externally terminated in 75 Q Figure 2 9 Typical signal connections for each operating mode 2 32 AVDC100 Audio Video Delay Corrector User Manual VE Reference E T a Reference This chapter describes the audio to video delay problem affecting digital video processing and transmission and how the AVDC100 Audio Video Delay Corrector uses digital watermarking technology to measure and correct audio to video delay Illustrations are provided of various video transmission systems showing where the instrument should be installed in the system to correct A V delay The Audio To Video Delay Problem Audio to video A V synchronization is not a new problem with the transition to digital video For both analog and digital video television programs start out with their video and audio synchronized but because the video and audio signals are typically transported and processed separately before final distribution as a program they can experience different processing delays which can result in the annoying video phenomenon commonly referred to as lip sync error Most lip
18. AUDIO DISPLAY The audio meter should be displayed showing peaking bursts of audio activity 7 Repeat step 6 for the REF AVDC100 D 18 AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Verify the Initial Setup Perform the following checks to verify that you connected the instruments properly in the initial setup procedure 1 On the DUT AVDC100 check for the following conditions m The BYPASS LED is illuminated m The display shows the audio meter with both channels peaking together at 2 second intervals 2 On the REF AVDC100 check for the following conditions m The BYPASS LED is illuminated m Both the VIDEO and AUDIO LEDs are green m The display shows the audio meter with both channels peaking together at 2 second intervals 3 On the digital audio monitor check for the following conditions All four bars are peaking together at 2 second intervals m Lissajous appears as a bursting vertical line 4 On the digital video monitor check for the following conditions m A locked Eye pattern display with 800 mV amplitude m The Serial Alarm light Red is OFF AVDC100 Audio Video Delay Corrector User Manual D 19 Appendix D Functional Verification Basic Functional Tests Perform the following procedures to verify the basic functional performance of the AVDC100 Decoder Operation Test 1 On the REF AVDC100 change to Encode mode 2 On the REF AVDC100 set the watermark
19. B 3 General care C 1 Generator zone plate signals 2 14 H Hardware version 2 25 Holographic watermark 3 6 Horizontal pixel number 2 12 Initial configuration 1 13 Installation Other broadcasters 3 18 rackmount 1 8 remote truck 3 17 stand alone 1 7 Studio 3 16 Typical 3 15 Intensity watermark signal 2 16 IP address 2 21 2 24 B 3 Incorrect B 13 K Key features 1 3 L LED test 2 15 LEDs status 2 29 Line number 2 12 Lip sync error Glossary 1 Loss of watermark 2 18 Index 2 MAC address 2 22 2 25 Maintenance preventive C 2 Manual audio delay 2 18 Manual structure vii Mechanical characteristics A 7 Menu trees 2 26 Menus Boot menu 2 23 2 28 Configuration menu 2 16 2 27 Mode menu 2 10 2 26 Navigation 2 10 Overview 2 10 Status menu 2 10 2 26 Test menu 2 13 2 26 MIB Glossary 1 MIB definitions B 7 MIB file B 6 Mode button 2 2 Mode menu 2 10 2 26 Navigation of menus 2 10 Network troubleshooting B 12 Network configuration 2 21 2 23 Network manager B 3 B 4 Glossary 1 Not receiving traps from server managers Trouble shooting procedure B 19 0 Operating basics 2 1 Operating modes Bypass 2 3 Decode 2 3 Encode 2 2 Optional accessories 1 6 Options and accessories 1 5 AVDC100 Audio Video Delay Corrector User Manual Index P Performance conditions A 1 Phone number Tektronix ix Pinging a host machine B 16 Pixel number
20. DNS server If you are upgrading the AVDC100 locally you can enter the address as it appears on the instrument display The colon and port number 77 that follow are not required 3 Enter the host name or IP address of the AVDC100 and then press the Return key on the PC to start the data transfer of the new instrument firmware 4 When the AVDC100 starts receiving data from the PC the instrument will display the following message Receiving data from 192 168 1 10 IP address of PC 5 While the AVDC100 is receiving data from the PC the instrument display will report on the progress of the data transfer 6 After the AVDC100 receives the upgrade data the instrument begins erasing flash memory While the flash memory is erased the instrument displays the following message Erasing Flash This takes a while NOTE This process will take from 1 to 3 minutes The flash memory erasure proceeds as fast as the flash memory allows and the time varies from instrument to instrument 7 After erasing the flash memory the AVDC100 writes the new firmware data into flash memory While the flash memory is programmed the instrument displays the following message Programming Flash MMM 168 1 10 As the programming of the flash memory begins the display again shows the IP address of the PC controlling the firmware upgrade Bar graph blocks overwrite the IP address from left to right to indicate the progress of the flas
21. Laboratory Use AVDC100 Audio Video Delay Corrector User Manual A 9 Appendix A Specifications Table A 11 Safety certification and compliance Cont Category Standards or description Terminals on this product may have different installation overvoltage category designations The installation categories are Installation Overvoltage Category CAT III Distribution level mains usually permanently connected Equipment at this level is typically in a fixed industrial location CAT II Local level mains wall sockets Equipment at this level includes appliances portable tools and similar products Equipment is usually cord connected CATI Secondary signal level or battery operated circuits of electronic equipment A 10 AVDC100 Audio Video Delay Corrector User Manual SS Aa a Appendix B Remote Control The AVDC100 A V Delay Corrector provides an internal SNMP Simple Network Management Protocol agent to facilitate remote operation of the instrument With your third party software for SNMP network control you can use the AVDC100 MIB Management Information Base to query and change instrument settings This appendix provides the following information m A description of the SNMP agent Instructions for configuring the instrument for network operation Instructions for configuring the remote network manager to communicate with the AVDC100 m Definitions of the MIB and traps used by the instrument m Techniq
22. Status menu selection to display one of the following status messages about the time code receiver m lt XX XX XX XX gt Displays the current time code as decoded from the LTC time code input in hours minutes seconds and video frames The display updates at the rate of 30 frames per second m No LTC Time Code Displayed when the instrument cannot detect a time code input signal 3 SDI Receiver Use this Status menu selection to display one of the following status messages about the SDI receiver Locked Displayed when the SDI Receiver is currently locked to the video input signal m Unlocked Displayed when the SDI Receiver cannot lock to the video input signal 4 SDI Deserializer Use this Status menu selection to display various status messages about the SDI deserializer Table 2 2 lists the different status messages you may encounter Table 2 2 SDI Deserializer status messages Message Description a Locked Locked is displayed when the SDI deserializer is currently locked to the video input signal Unlocked Unlocked is displayed when the SDI deserializer cannot lock to the video input signal b 525 4 2 2 525 4 2 2 is displayed when the SDI deserializer detects a 525 line 625 4 2 2 digital video input signal No Video 625 4 2 2 is displayed when the SDI deserializer detects a 625 line digital video input signal No Video is displayed when the SDI deserializer cannot detect a digital video input signal NOTE
23. Subnet Mask and Gateway configuration settings appear in the Configuration menu and also in the Boot menu described starting on page 2 23 The settings for these parameters are shared between the two menus and any parameter changes appear in both menu displays Table 2 10 Network configuration settings Configuration menu Menu selection a Config Mode b IP Address AVDC100 Audio Video Delay Corrector User Manual Description Use this setting to set the instrument to the method used by your LAN Ethernet network to configure machines that connect to the network Manual Mode Use this setting if your instrument has been assigned a static network address The instrument will use the IP address subnet mask and gateway parameters you enter DHCP Server Use this setting to obtain network configuration parameters from a DHCP server One or more DHCP servers must be running on your network to use this setting Use the left and right arrow buttons to display the desired mode the up and down arrow buttons to cancel the selection and the Select button to change the configuration mode Use this setting to view or edit the IP address assigned to the instrument by your network administrator Manual Mode If the instrument is set to Manual mode in the Config Mode menu selection described above you can view or edit the IP address assigned to the instrument by your network administra tor DHCP Server Mode If the instru
24. The following two methods of rackmounting are supported m Single Instrument The hardware for rackmounting a single instrument is provided as a standard accessory The installation instructions to rackmount a single instrument are located on page 1 10 Dual Instrument You can order the optional TVF16 Zero Clearance Dual Rackmount Adapter kit to rackmount two AVDC100 instruments side by side with zero vertical clearance Instructions for installing the TVF16 adapter are included with the kit All of the hardware required for rackmounting a single AVDC100 instrument is provided as a standard accessory with each instrument Table 1 3 lists the replacement parts for the single instrument rackmount hardware The numbers in the figure item number column of Table 1 3 correspond to the item numbers shown in Figure 1 3 These item numbers are also referenced in the rackmounting installation procedure Table 1 3 Parts list for the single instrument rackmount hardware Figure item number Part number Description 020 2405 XX HARDWARE SINGLE RACKMOUNT AVDC100 complete single rackmounting hardware kit 1 1 407 3776 01 BRACKET RACK MT SAFETY CONTROLLED 2 407 3775 02 BRKT RACK MT LEFT 3 407 3775 03 BRKT RACK MT RIGHT 4 212 0535 00 SCREW MACHINE 10 32 X 0 312 TRH STL NI PL POZ 5 212 0070 00 SCREW MACHINE 8 32 X 0 312 FLH 100 DEG STL CD PL POZ 6 220 0160 00 NUT CLIP ON 10 32 RACK FRAME MOUNT
25. WFM601M DUT AVDC100 Digital Video Monitor AES out CH 1 2 out CH 3 4 in AM70 RR Digital Audio Generator Digital Audio Monitor Digital out CH 1 2 in CH 3 4 out 75 Q Term Headphones m Figure D 1 Initial equipment connections for the electrical tests D 4 AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification 2 On the TSG601 digital video signal generator set the controls as follows to output a 625 line 800 mV shallow ramp signal with 10 pedestal and 10 ramp without an ID a e f Hold down the Lock Out button while pressing the ON button to enter the Diagnostic menu Use the 7 Format Select selection and the left and right arrow buttons to set the instrument to 625 line generation mode Press the Test Signals button repeatedly to select the Shallow Ramp output signal and then press the left and right arrow buttons to select 1 10 pedestal and 10 ramp Press the Output Ampl button and then use the arrow buttons to set the signal output amplitude to 800 mV Press the ON button twice to set the TSG601 to normal operation mode Press the ID On Off button to set ID generation to OFF 3 On the AM70 digital audio signal generator set the controls as follows to output a 1000 Hz 500 ms tone burst signal which is repeated every 1 15 seconds a b Press the GEN key to set the AM70 to generator mode Press the MENU key and th
26. and maintenance C 1 Community string 2 19 B 4 Config button 2 3 Configuration 1 13 Network manager B 4 Remote control B 2 Configuration menu 2 16 2 27 Configuration initial setup 3 12 Connecting power and signals 1 11 Connectors 2 30 Contacting Tektronix ix Correction range 2 17 Correlation audio 3 8 AVDC100 Audio Video Delay Corrector User Manual D Decode mode 2 3 Decoder configuration 2 17 Default audio delay 2 18 Default gateway Incorrect B 15 Delay configuration 2 17 Delay correction accuracy 3 8 Delay correction mode 2 17 DHCP server 2 21 2 23 Diagnostics descriptions C 4 Display problems C 4 Display readouts Bypass mode 2 9 Decode mode 2 5 Encode mode 2 4 Display test 2 15 Dual rackmount kit viii E EC declaration A 8 EMC certifications A 8 Encode mode 2 2 Encoder configuration 2 16 Environmental characteristics A 7 Error messages 2 6 Exterior cleaning C 1 F Firmware upgrade 2 25 Errors C 11 Menu selection 2 15 Firmware upgrades C 5 Firmware version 2 25 Front panel illustration 1 1 Front panel buttons 2 1 Arrow 2 3 Config 2 3 Mode 2 2 Select 2 3 Status 2 3 Test 2 3 Front panel test 2 15 Index 1 Index Functional verification Basic functional tests D 14 Electrical characteristic tests D 4 Enhanced functional tests D 23 Required test equipment D 3 Test interval D 1 G Gain meter 2 8 Gateway 2 22 2 24
27. between the audio envelope variation facsimile in the watermark and the audio envelope variation facsimile extracted from the audio input signal Figure 3 2 illustrates the correlation method used by the decoder in the instrument The instrument measures A V delay by acquiring two second samples of the video and audio signals and then comparing the data words representing the audio envelope variation facsimiles In Figure 3 2 the upper WAV file represents the audio signal from the program audio input The lower WAV file represents the audio used to generate the video watermark Figure 3 2 shows an A V delay error with the video being delayed by 24 video fields relative to the audio in the original program signal your audio signal timing must be within 30 video fields of the associated fh CAUTION Because the AVDC100 measures A V delay using two second samples video signal before the instrument can accurately measure the A V delay If your audio signal is advanced more than 30 video fields with respect to the associated video signal you must add additional audio delay to bring the audio signal timing to within 30 video fields of the video signal You can use the internal delay capability of the instrument to add up to 120 additional video fields of delay creating a total delay capability of 150 video fields ee 2 2 second sample blocks _ ______ 24 field no 24 field no correlation correlation Audio signal from WET t
28. code output 10 On the DUT AVDC100 check that the time code stops incrementing 11 On the LTC generator restart the time code output 12 On the DUT AVDC100 check that the time code resumes incrementing AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Perform the following steps to check the operation of the time code receiver on the AVDC100 using an LTC time code distribution source 1 On the DUT AVDC100 remove any connected time code source 2 On the DUT AVDC100 remove and reapply power or reboot the instrument To reboot the instrument use the Test menu 4 FIRMWARE UPGRADE setting and then the Boot menu 5 REBOOT setting 3 Wait for the DUT AVDC100 to power up 4 On the DUT AVDC100 check that the time code receiver displays No LTC Timecode Use the Status menu 2 TIME CODE RECEIVER setting 5 On the DUT AVDC100 connect an SMPTE LTC time code distribution source 6 On the DUT AVDC100 check that the time code receiver now displays the correct time code xx xx xx xx hours minutes seconds video frames This concludes the electrical verification procedures for the AVDC100 AVDC100 Audio Video Delay Corrector User Manual D 13 Appendix D Functional Verification Basic Functional Tests The basic functional tests in this section require one known good AVDC100 in addition to the AVDC100 to be tested These basic functional tests check the following instr
29. control All modes This interface is only used during the internal Tektronix manufacturing process of the instrument It is not intended for the remote control of the instrument All modes To provide instrument power AVDC100 Audio Video Delay Corrector User Manual 2 31 Operating Basics LAN Ethernet network gt LTC Time Code D gt Encode Mode LTC TIME CODE a i 100 240V 10 50 60Hz 60W MAX MEASURING AND TESTING EQUIPMENT RS232 DCE SELE D Voooss O LJ 10 BASE T SERIAL VIDEQ Ju DIGITAL AUDIO J Video to be watermarked Audio associated with the video input Feed through of audio input gt Watermarked video output LAN Ethernet network gt LTC Time Code LTC TIME CODE a i 100 240V 10 50 60Hz 60W MAX MEASURING AND TESTING EQUIPMENT RS232 DCE FETTE D Kooos O LJ 10 BASE T ERIAL VIDEQ Ju DIGITAL AUDIO J Watermarked video to be decoded A Audio associated with the video input Delay corrected audio output gt Feed through of video input gt Video output must be externally terminated in 75 Q LAN Ethernet network gt LTC Time Code gt Bypass Mode LTC TIME CODE A f N 100 240V 10 50 60Hz 60W MAX MEASURING
30. diagonal vertical and horizontal the signal can show where the watermark encoder is trying to hide the watermark If the watermark signal is hard to detect using a zone plate signal it will be virtually impossible to see on program video You can use the built in zone plate signals for the following purposes m Demonstrating the effects of any existing watermark on the video signal You can view the signal effects by connecting the video signal from the AVDC100 to a picture monitor m Testing image compression You can test how well a CODEC is filtering the image frames on stationary video NOTE A moving zone plate signal not available with the AVDC100 is required to test temporal filtering by a CODEC m Indicating the resolution and aliasing of a picture monitor and for checking for de interlaced 480P converted signals m Testing composite PAL and NTSC luma chroma separation The zone plate signal is able to test a composite NTSC PAL encoder and decoder that have adaptive comb filters with vertical and horizontal filtering but often have poor diagonal frequency separation m Testing image processors such as median filters and noise reducers Median filters are non linear filters that remove sparkles but often distort the sinusoidal zone plate signal indicating their worst case effects AVDC100 Audio Video Delay Corrector User Manual Operating Basics 3 Initiate Test Use this Test menu selection to test the func
31. hee eae Winged ee Pelee Slane tan N 3 1 The Audio To Video Delay Problem 0 0 0 ee eee ee eee 3 1 Digital Watermarking u ranan ae a ed ea an 3 5 Correcting A V Delayer sena Fes See 2a aa nn 3 7 Typical Installations seni yee cae ee Laas ae a a am 3 15 AVDC100 Audio Video Delay Corrector User Manual i Table of Contents Appendices Glossary Index Appendix A Specifications 0 ccc cece eee r cece reece A 1 Performance Conditions sisiran nar raan ccc cece eee eens A 1 Platform Characteristics so ae iras a aE ccc cee eee eens A 1 Watermark and A V Delay Correction Characteristics 222202200 A 1 I O Port Electrical Characteristics 1 0 0 eee ee cece eee A 3 Power Characteristics 22 22 22 a En Rain A 6 Mechanical Physical Characteristics 222cceeeeeeeeennnn A 7 Environmental Characteristics s asri ari an aea AEEA eee eee A 7 Certifications and Compliances 0 0 0 cee eee eee A 8 Appendix B Remote Control 0 ccc cece cree cece eee B 1 SNMP Agent Description eisin a E eE eee ee eee B 1 Configuring the AVDC100 for SNMP Operation 00 B 2 Configuring the Network Manager 00 ce eee eee eee eee eee B 4 Defining the MIB 2 2 2 0 ne ale a le B 6 Network Troubleshooting cee ec cee eee B 12 Appendix C User Service cece cece cere eee e een cees C 1 Cleaning and Maintenance 0 eee cece ee eee eee eee C 1
32. in SDI out SDiin LTCin SDlout SER A In REF1 AVDC100 XLR WFM601M En AES out DUT AVDC100 Digital Video Monitor AES out CH 1 2 out AM70 Weft EINE Digital Audio Generator Digital Audio Monitor Digital out CH 1 2 in CH 3 4 out Figure D 2 Initial equipment connections for the basic functional tests AVDC100 Audio Video Delay Corrector User Manual D 15 Appendix D Functional Verification 2 On the TSG601 digital video signal generator set the controls as follows to output a 625 line 800 mV shallow ramp signal with 10 pedestal and 10 ramp without an ID a e f Hold down the Lock Out button while pressing the ON button to enter the Diagnostic menu Use the 7 Format Select selection and the left and right arrow buttons to set the instrument to 625 line generation mode Press the Test Signals button repeatedly to select the Shallow Ramp output signal and then press the left and right arrow buttons to select 1 10 pedestal and 10 ramp Press the Output Ampl button and then use the arrow buttons to set the signal output amplitude to 800 mV Press the ON button twice to set the TSG601 to normal operation mode Press the ID On Off button to set ID generation to OFF 3 On the AM70 digital audio signal generator set the controls as follows to output a 1000 Hz 500 ms tone burst signal which is repeated every 1 15 seconds a b c d Press the GEN key to set the
33. in the following assigned to the AVDC100 You can set the form XXX XXX XXX XXX IP address only if your network permanently assigns IP addresses to connecting machines Use this object to view or set the network IP address in the following subnet mask address assigned to the form XXX XXX XXX XXX AVDC100 by your network administrator Use this object to view or set the network IP address in the following gateway address assigned to the AVDC100 by form XXX XXX XXX XXX your network administrator Use this object to view the IP address of the IP address in the following DHCP server controlling the LAN Ethernet form XXX XXX XXX XXX network If the AVDC100 is set to manual network address mode the DHCP server Not Available address is not available Use this object to view the MAC address Ethernet address in the assigned to the AVDC100 on your LAN following form Ethernet network EEE Beet XXXXXX XX XX XX Use this object to save the current set of Setup1 configuration settings for the AVDC100 Setup2 Setup3 Setup4 Use this object to restore previously saved Setup1 configuration settings for the instrument In Setup2 addition to restoring the four user defined saved configurations you can restore the Setup3 factory default configuration settings Setup4 Factory AVDC100 Audio Video Delay Corrector User Manual Appendix B Remote Control Trap Definitions Notifications called traps are used to notify the remote ne
34. little as 5 of the original video frame making the watermark data channel very robust to signal corruption AVDC100 Audio Video Delay Corrector User Manual Reference Correcting A V Delay Using the AVDC100 to measure and correct A V delay in your digital video program requires two instruments One must be located at the video source and the other must be located at the last point of signal control This section describes the process required to use the instrument to correct A V delay the method of configuring the instrument to achieve maximum results and illustrations of some typical instrument installations AN Delay Correction The process for using the AVDC100 to correct A V delay starts by locating an Overview instrument configured to encode mode as close as possible to the original video source This allows for the audio and video signals of the digital video program to enter the instrument properly timed The instrument samples the audio envelope variation from the audio input in two second blocks The instrument then creates a heavily compressed trans formed facsimile of the audio envelope variation to code into data words The data words are then encoded onto the video signal as part of a permanent watermark pattern creating a record of the audio envelope variation at that point in time NOTE The system is coding only a very low bit rate representation of the audio envelope variation as opposed to a high quality repr
35. olan AES Audio Encode Decode AES Audio to Plant Archival Figure 3 7 Typical in studio installation 3 16 AVDC100 Audio Video Delay Corrector User Manual Reference Remote Production Truck The remote production truck is a good location to install an encoding AVDC100 Installation Installed at the output of the video and audio mix the program is watermarked at the point of signal origination The video and audio is then routed by normal means back to the studio see Figure 3 8 Remote Production Truck SDI Watermarked Watermarked Video Video SDI Video SDI Video Switch Transport AVDC100 Boa an stream ei AES Audio Audio Mix gt Switch Figure 3 8 Typical remote truck installation gt AVDC100 Audio Video Delay Corrector User Manual 3 17 Reference Studio Input This example puts an AVDC100 on the output of a video frame synchronizer Decode and Correct correcting the program at the input to the studio facility after downlink from an Installation outside broadcast source see Figure 3 9 Plant Reference N Watermarked MPEG SDI Video Frame Transport Stream Synchronizer AES Audio Watermarked SDI Video AVDC100 Watermarked SDI Video Watermarked A V delay Programming to corrected Plant Archival AES Audio Figure 3 9 Typical studio input decode correct installation 3 18 AVDC100 Audio Video Delay Corrector User Manual Appendices Appendix A Specifications
36. on page 2 19 and Table 2 10 on page 2 21 for information about configuring the various network parameters Refer to Appendix B Remote Control for information about how to use the instrument over a LAN Ethernet network 1 14 AVDC100 Audio Video Delay Corrector User Manual e a Operating Basics ey 7 Operating Basics Front Panel Buttons The front panel of the AVDC100 A V Delay Corrector see Figure 2 1 includes three functional areas the menu control buttons the display module and the instrument status LEDs This chapter provides the basic information required to operate the instrument by describing how to use each of these functional areas You can operate the AVDC100 from a remote location using the LAN Ethernet port and built in SNMP agent Refer to Appendix B Remote Control for more information P STATUS Tektronix AVDC 100 A V DELAY CORRECTOR aoa WEST abi i pecope pata pAMyO BYPASS SEL JSO MODE STATUS TEST CONFIG LJILILI YY Figure 2 1 AVDC100 front panel The operating information is divided into the following sections m Front Panel Buttons page 2 1 m Display Readouts page 2 4 m Menu Commands page 2 10 m Status LEDs page 2 29 m Rear Panel Connections page 2 30 Press the Mode Status Test or Config buttons to display the associated functional menu Once you have displayed the desired menu use the arrow shaped buttons to navigate the menu structure and use the center
37. or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Terms on the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product The following symbols may appear on the product A 6 CAUTION Protective Ground Refer to Manual Earth Terminal AVDC100 Audio Video Delay Corrector User Manual Preface Manual Structure This document is a user manual which describes how to install and operate the Tektronix AVDC100 Audio Video Delay Corrector instrument NOTE Updated versions of the AVDC100 user documentation and additional information about the instrument can be downloaded from the Tektronix website www tektronix com This user manual is organized into the following sections Getting Started This section provides a description of the primary features of the instrument a list of available options and accessories and instructions for installing and configuring the instrument Operating Basics This section describes the basics of how to operate the instrument Included are descriptions of the front and rear panel controls as well as each of
38. present 2 After the data transfer program finds the firmware pkg file you will be asked for the host name or IP address of the AVDC100 CAUTION To prevent unwanted data transfers you can abort the firmware upgrade process using the following methods Before you enter the host name or IP address m Press the Return key on the PC without entering a host name or IP address m Press a button on the AVDC100 front panel After you enter the host name or IP address m Press a button on the front panel while the AVDC100 is waiting for a network connection or receiving firmware upgrade data Once the AVDC100 has received the firmware upgrade data and has started erasing and programming the flash memory the instrument will not respond to the front panel buttons or remote commands At this point the firmware upgrade should be allowed to complete If the firmware upgrade is disrupted by loss of power or by some other failure the instrument will return to the Boot menu when it restarts You must then repeat the firmware upgrade process to program the instrument firmware Refer to Upgrade Errors on page C 11 for information about the error messages you may encounter and a list of possible causes AVDC100 Audio Video Delay Corrector User Manual C 9 Appendix C User Service NOTE To use a host name the instrument must have been assigned a host name by the local network administrator who has registered the host name with a
39. program Table 2 1 Error messages in Decoder mode Error message loAud loCor loEnv noDat noWM nSync stall Definition Low audio volume The audio signal was muted or not loud enough to use for decoding This message can be displayed when the A V Delay LED is yellow Low audio correlation The audio signal did not appear to match the audio extracted from video signal watermark This message can be displayed when the A V Delay LED is yellow Low audio envelope The audio signal amplitude did not vary enough for the instrument to create an audio signature This message can be displayed when the A V Delay LED is yellow No data No audio watermark data was present in the video E is displayed for the number of errors This message can be displayed when the A V Delay LED is yellow No watermark The instrument is recovering from a no watermark signal condition This message can be displayed when the A V Delay LED is red The instrument will calculate the A V delay measurement value during this condition but automatic delay correction will not use the values until this condition clears No sync No watermark sync pattern was detected Data LED is red This message can be displayed when the A V Delay LED is yellow A V measurement stall The instrument is recovering from an A V delay measurement stall condition This message can be displayed when the A V Delay LED is red The instrument wi
40. query The context is currently described by clear text and is called a community string or security name By default TEKTRONIX is configured as the community string value when the AVDC100 is shipped from the factory The 3 Remote Control c Modify Community String selection in the Configuration menu allows you to modify the default community string value NOTE To facilitate the authentication of valid queries from the network manager both the AVDC100 and the network manager must be configured with the same community string value m Enterprise Name and Object Identifier The network manager must be configured by your network administrator with the enterprise name of the AVDC100 and with the object identifier number assigned to the MIB of the instrument The default enterprise name of the AVDC100 is TEKTRONIX and the default object identifier for the MIB is 1 3 6 1 4 1 128 1 6 You cannot change these default values MIB Definitions The network manager must be configured with the MIB definitions used by the AVDC100 before the network manager can perform valid get and set commands Refer to Defining the MIB on page B 6 for a description of the MIB used by the AVDC100 AVDC100 Audio Video Delay Corrector User Manual B 5 Appendix B Remote Control Defining the MIB SNMP Reference Information B 6 The MIB Management Information Base used by the AVDC100 provides the information needed to control the ope
41. rack environment Refer to Reference starting on page 3 1 for detailed information about where to install the instrument in your digital video system Refer to Appendix D Functional Verification for procedures you can use to verify the functionality of the instrument Stand Alone Installation Rubber feet are supplied as a standard accessory with each instrument The rubber feet are provided for use when you install the instrument in a stand alone or desktop environment To install the rubber feet peel the protective cover off the back of the feet and attach them to the bottom of the instrument at the registration marks See Figure 1 2 Four feet are required one on each corner If you will be placing very heavy objects on top of the instrument you can optionally install two additional feet in the middle of the instrument Foot Foot Foot required optional required Y e 8 Oe ot A 1 Ee Attach foot here Registration marks Front panel Attach foot here p al Is j Re a o e O Foot required Foot Foot optional required Figure 1 2 Installing rubber feet stand alone installation only AVDC100 Audio Video Delay Corrector User Manual 1 7 Installation Rackmount Installation Single Instrument Rackmount Parts List 1 8 This instrument can be mounted into a standard 19 inch equipment rack
42. selections Message Description a Encoder On Displays the current status of the watermark encoder You can use this menu selection to toggle the encoder function on and off Encoder Off This selection only functions when the instrument is set to the Encode operating mode b Audio Delay On Displays the current status of the A V delay function You can use this lection to instantly toggle the A V delay on and off Audio Delay Off is SE E toogietne Ardsley This selection only functions when the instrument is set to the Decode operating mode NOTE When you use this selection to toggle the audio delay on and off the delay is instantly switched between the corrected audio delay and the fixed audio delay instead of changing at the standard rate of one video field per second Using this function on a live video signal will likely cause audio effects that will be noticed by viewers c Zone Plate On Displays the current status of the zone plate signal output You can use this menu selection to toggle the zone plate signal output Zone Plate Off function on and off You can turn the zone plate signal on in any operating mode Refer to the Caution below CAUTION To prevent you from unintentionally replacing a live video program N signal being output by the AVDC100 with the zone plate signal the instrument display will ask you to confirm your selection when you attempt to enable the zone plate signal output The AVDC100 is designed
43. set the network IP address method use the left and right arrow buttons to display the desired mode the up and down arrow buttons to cancel the selection and the Select button to change the configuration mode B 2 AVDC100 Audio Video Delay Corrector User Manual Appendix B Remote Control IP Address of AVDC100 You must enter the IP address assigned to the AVDC100 by your network administrator only when your network assigns a static IP address to connecting machines Use the 5 Remote Control b IP Address selection in the Configura tion menu to enter the IP address of the instrument Use the arrow buttons to highlight and then change each number in the IP address to a number ranging from 0 to 9 Press the Select button to save the modified IP address Subnet Mask If your network requires a subnet mask use the 5 Remote Control c Subnet Mask selection in the Configuration menu to enter this parameter Use the left and right arrow buttons to select between valid subnet masks until the address matches the one assigned by your network administrator The number displayed after the character represents the size of the network portion of the selected subnet mask Use the up or down arrow to cancel the selection or press the Select button to save the modified subnet mask Gateway If your network requires a gateway address use the 5 Remote Control d Gateway selection in the Configuration menu to enter this parameter The ga
44. the DUT AVDC100 change the controls as listed below m Set the default audio delay to 119 Fields Use the Configuration menu 2 DECODER c Default Audio Delay setting Press the Select button m Press the CONFIG button to clear the menu display 6 Wait for about 2 3 minutes while the AVDC100 instrument delay settles adjusts at the rate of one video field per second 7 On the the DUT AVDC100 check that the display reads AV 90 and D 90 AVDC100 Audio Video Delay Corrector User Manual D 29 Appendix D Functional Verification 8 On the digital video generator change the signal format to 525 line 9 On the REF2 AVDC100 set the manual delay to be 100 Fields Use the Configuration menu 2 DECODER d Manual Delay setting Press the Select button 10 Repeat steps 1 through 7 with the digital video generator in 525 line mode This concludes the enhanced performance verification procedures for the AVDC100 D 30 AVDC100 Audio Video Delay Corrector User Manual i Glossary o o Glossary Accuracy The closeness of the indicated value to the true value A V Delay The difference in the timing relationship between the video and audio signals within a digital video program Lip Sync Error The physical manifestation of A V delay in a video program where the viewer notices discrepancies in the timing between the visual and audible portions of the program MIB The MIB Management Information Base provides the infor
45. the signal inputs to the instrument it does not reflect the A V timing relationship at the instrument outputs after any delay correction may have been applied to the audio signal A V delay at the signal outputs of the instrument is fully compensated when the displayed A V delay measurement value and the dynamic or fixed delay value are equal both are 1 in the example shown in Figure 2 3 The A V delay measurement range is from 30 to 150 video fields Values outside of this range may not be reliable Negative values indicate the correctable condition of the audio signal arriving early advanced at the instrument with respect to the video signal Positive values indicate that the audio signal is arriving late delayed at the instrument with respect to the video signal The instrument was not designed to correct delayed audio signals AVDC100 Audio Video Delay Corrector User Manual 2 5 Operating Basics 2 6 Flds is displayed when the instrument is able to use the most recent video sample to perform the A V delay measurement The symbol and an error message replaces Flds when the instrument is unable to update the A V delay measurement using the most recent video sample Table 2 1 lists the error messages you may encounter NOTE These error messages will appear intermittently during normal instrument operation A persistent error message is required to indicate that there may be a problem with the video
46. to monitor and correct A V delay in live video programs Be certain of the downstream destination of the video signal from the instrument before you enable the zone plate signal output AVDC100 Audio Video Delay Corrector User Manual 2 13 Operating Basics 2 Zone Plate Use this Test menu selection to select which zone plate signal will be output when you enable the zone plate signal generator The AVDC100 provides a built in zone plate signal generator capable of generating a zone plate signal with eight different spatial frequencies The different spatial frequencies help you to identify any visual watermark unmask ing effects that may occur as the watermarked video signal is routed through various video processing equipment such as MPEG CODECs The zone plate signals are labeled 1 8 with signal 1 having the lowest two dimensional spatial frequency limit and signal 8 having the highest spatial frequency limit The lower spatial frequency settings are for use with very high compression CODECs with low spatial resolution Zone plate signal 7 is the recommended spatial frequency for standard definition video The zone plate signals are highly stressful signals that are useful for exposing watermark effects on picture monitors These signals may expose watermarks encoded by the AVDC100 as well as watermarks that were encoded with equipment made by other manufacturers Since the zone plate signal has all of the spatial frequencies
47. to queries from the network manager Table B 1 describes each of the MIB objects defined for the AVDC100 lists the corresponding front panel menu selections where applicable and lists the possible returned values for each object Some of the MIB objects respond to get and set commands while others only respond to get commands Most of the MIB objects correspond to selections you can make using the various menus of the instrument Refer to Operating Basics starting on page 2 1 for detailed operating information for the instrument NOTE The MIB objects used by the AVDC100 are case sensitive and must be entered as they appear in Table B 1 Table B 1 Definition of the MIB objects for SNMP remote control Corresponding menu selec Entered or returned tion or display element Description values Mode menu and mode LED Use this object to view or change the current encoder operating mode of the instrument MIB object currentMode aesReceiver timeCodeReceiver sdiReceiver sdiDeserializer decoder bypass Status menu Use this object to view the status of the No Errors 1 AES Receiver N Validity Errors CRC Error Parity Error Coding Error Unlocked Status menu Use this object to view the status of the time Receiving LTC Status menu Use this object to view the status of the SDI Locked Status menu Use this object to view the status of the SDI Locked AVDC100 Audio Video Delay Corrector User Manual B 7 Appendix
48. 0 Subnet mask 255 255 255 0 Subnet mask 255 255 255 0 Default gateway 128 181 99 1 Default gateway 128 181 99 1 Default gateway 128 181 99 10 Figure B 3 Incorrect default gateway IP address AVDC100 Audio Video Delay Corrector User Manual B 15 Appendix B Remote Control Common Troubleshooting Procedures This section provides procedures to help you troubleshoot network problems you may be having with your instrument Pinging a host machine One of the utilities provided with all TCP IP installations is Ping exe For example on PCs using the Windows NT operating system look for this utility in the C winnt system32 directory of your network manager This utility allows you to send communication packets to and record the response from an indicated host machine Successful pinging determines whether or not your packets arrived at the destination To run ping use the following procedure 1 Select Run from the Start menu The Run dialog box appears 2 Type one of the following commands into the Run text box ping machineName ping IPaddress In the examples above machineName and IPaddress represent the host machine name and IP address respectively of the networked device you are trying to ping 3 Click OK A DOS window appears indicating whether or not the destination is responding to the ping In Figure B 4 the destination machine Oxford4 is not responding Ma C WINNT4S ystem32 ping exe Pinging Oxford4 cse t
49. 0 once a year to verify that the instrument still meets its functional requirements Refer to the procedure in Appendix D Functional Verification Preventive maintenance mainly consists of periodic cleaning Periodic cleaning reduces instrument breakdown and increases reliability You should clean the instrument as needed based on the operating environment Dirty conditions may require more frequent cleaning than computer room conditions Repackaging for Shipment If an instrument is to be shipped to a Tektronix field office for repair attach a tag to the instrument showing the following information m Owner s name and mailing address Serial number of the instrument m Description of the problem s encountered and or service required The AVDC100 is shipped in a carton designed to provide it with the maximum protection during transit Keep the original shipping carton for later use in case you need to reship the instrument CAUTION To prevent the loss of the warranty on your instrument Tektronix strongly recommends that you use an actual AVDC100 shipping carton that is in good condition when you ship your instrument to another location or when you return the instrument to a Tektronix service center for repair Tektronix cannot honor the warranty on your AVDC100 if the instrument arrives at the service center damaged and it was not shipped in its original carton or in a replacement carton and its supporting packaging material pur
50. 100 after about 30 seconds check for an audio delay display of F 25 Ignore all other displayed information AVDC100 Audio Video Delay Corrector User Manual D 21 Appendix D Functional Verification On the DUT AVDC100 check the Status LEDs for the following conditions m Video Green m Audio Green m Data Red m A V Delay Red On the digital audio monitor check that the Lissajous appears as alternating straight line displays along the diagonal L and R axes There should be no circles or ellipses present If there are circles or ellipses present on the digital audio monitor perform the following steps Otherwise continue to step 7 m On the DUT AVDC100 toggle the audio delay function off and then back on again Use the Test menu 1 TOGGLE b Audio Delay setting Press the Test button to clear the menu display On the digital audio monitor recheck that the Lissajous appears as alternating straight line displays along the diagonal L and R axes There should be no circles or ellipses present NOTE If the circles or ellipses are still present verify the test equipment setups particularly the standard of the digital video signal should be 625 line 10 11 12 13 14 On the digital audio generator change the burst width to 510 ms On the digital audio monitor check that the Lissajous appears with a circle or ellipse momentarily appearing along with the two straight lines On the digital video si
51. 100 Audio Video Delay Corrector User Manual SS ae eee Appendix D Functional Verification This section contains procedures for verifying the functionality of the AVDC100 instrument Three stand alone procedures are provided m Electrical Characteristic Tests The electrical characteristic tests require no additional AVDC100 instruments to check the video output jitter and amplitude the video signal integrity the watermark signal amplitude the video standard recognition 525 line 625 line the audio signal input and output the time code receiver and the input cable length requirement for no data bit errors m Basic Functional Tests The basic functional tests require one additional AVDC100 to the instrument to be tested to verify the functions of the watermark encoder the detection capability of the watermark decoder and the operation of the embedded audio delay m Enhanced Functional Tests The enhanced functional tests require two additional AVDC100 instruments to the instrument to be tested The enhanced tests verify the A V delay measurement and correction in manual and automatic delay correction modes NOTE These functional verification procedures do not currently verify the remote control functions of the instrument Test Interval Perform these procedures once every 2000 hours of operation or every 12 months to ensure that instrument performance remains within tolerance Test Prerequisites The tests in this ap
52. 100 on a different network than you use for the normal operation of the instrument you will need to modify the network settings Refer to Configuring the AVDC100 for SNMP Operation on page B 2 for more information 4 Select 4 UPDATE FIRMWARE from the Boot menu and then press the Select button The AVDC100 begins waiting for contact from the data transfer utility While the instrument waits the IP address and port number 77 on which the instrument is waiting is displayed An example display is shown below Waiting for Update 192 168 1 1 77 NOTE If the DHCP Server network configuration mode is selected on the AVDC100 the instrument may display the following message on the front panel while it is trying to retrieve an address from a DHCP server Starting Network Waiting for DHCP If the instrument fails to get an address from a DHCP server or if the message persists for more than 15 seconds use the manual network configuration mode You will have to manually configure the IP address subnet mask and gateway address of the instrument 5 Proceed to Upgrading the Instrument Firmware on page C 9 AVDC100 Audio Video Delay Corrector User Manual C 7 Appendix C User Service C 8 Non Network Installation Perform the following procedure to prepare the AVDC100 for a firmware upgrade when the instrument is not installed on a LAN Ethernet network 1 Connect the AVDC100 to a PC through a mini Ethernet hub
53. 100 to one of the following operating modes Encode mode Use this mode to enable the instrument to permanently encode the video input signal with a watermark that enables the instrument to measure A V delay and to identify a user defined source ID Decode mode Use this mode to enable the instrument to decode a previously inserted watermark from the video input signal The instrument can use the decoded watermark to measure and correct A V delay and or to identify the video source ID Bypass mode Use this mode to bypass the instrument in the video and audio signal paths In this mode the video and audio input signals pass through the instrument without any signal processing Configuring the Watermark Encoder To operate the instrument in Encode mode you must first configure the watermark encoder using the Configure menu Refer to Table 2 6 on page 2 16 for information about configuring the watermark encoder AVDC100 Audio Video Delay Corrector User Manual 1 13 Configuration Configuring the Watermark Decoder To operate the instrument in Decode mode you must first configure the watermark decoder using the Configure menu Refer to Table 2 7 on page 2 17 for information about configuring the watermark decoder Setting the Network Parameters To operate the instrument remotely over a LAN Ethernet network you must first configure the LAN Ethernet network communication parameters using the Configure menu Refer to Table 2 8
54. 30 video fields User selectable Default Audio Delay 0 120 video fields User selectable Adjustment Resolution 1 video field Rate of Delay Adjustment 1 video field per second Audio delay can be manually changed instantly using the Test mode Response to loss of watermark Holds to last measured delay value or decays to the default delay value user selectable Manual Audio Delay A valid 525 line or 625 line digital video signal must be connected to the instrument Adjustment Resolution Correction range User selectable Response to loss of watermark Ld Holds to the user selected delay value A 2 AVDC100 Audio Video Delay Corrector User Manual Appendix A Specifications 1O Port Electrical Characteristics Table A 3 Serial Video port Characteristic Description Input Port Connector BNC 75 Q Bit Rate 270 Mbps 100 ppm Input Signal Launch Amplitude for No Bit Errors Maximum Cable Length for No Bit Errors 720 mV 880 MVp p Equivalent to 200 meters of Belden 8281 Input Configurations Encode mode 75 Q internal termination Decode and Bypass modes Via relay contacts to the Serial Video output Bypass mode Default mode in the event of loss of power input video still monitored gt 15 dBm minimum from 1 MHz to 270 MHz with respect to 75 Q Return Loss Insertion Loss Equivalent to lt 25 meters of Belden 8281 cable AVDC100 Audio Video Delay Corrector User Manual Supplemental information Meets requir
55. All Settings from the Configuration menu you can save or restore up to four user defined sets of complete configuration settings for the instrument labeled Setup 1 Setup 4 In addition to restoring the four saved configurations you can restore the factory default configuration settings 2 22 AVDC100 Audio Video Delay Corrector User Manual Operating Basics Boot Menu From the Boot menu you can reboot the instrument upgrade the instrument firmware and set network configuration parameters There are two methods you can use to access the Boot menu m Select Firmware Upgrade from the Test menu m Hold down a front panel menu button when you apply power to the instrument The Boot menu provides the following menu selections 1 Network When you select Network from the Boot menu you can change the network settings listed in Table 2 11 These settings configure how the AVDC100 communicates with Network Management Stations over your LAN Ethernet network Refer to Appendix B Remote Control for information about how to use the AVDC100 over your LAN Ethernet network NOTE The Config Mode IP Address Subnet Mask and Gateway configuration settings appear in the Configuration menu and also in the Boot menu The settings for these parameters are shared between the two menus and any parameter changes appear in both menu displays Table 2 11 Network configuration settings Boot menu Menu selection a Config Mode D
56. B Remote Control Table B 1 Definition of the MIB objects for SNMP remote control Cont Corresponding menu selec MIB object tion or display element Description waterMarkSignal Status menu Use this object to view the status of the watermark signal in Encode and Decode 5 Watermark Signal operating modes Refer to Table 2 3 on page 2 12 for more information about the watermark signal status display NOTE The watermark signal gain cannot be reported via remote control On the AVDC100 front panel display the I character is a bar graph indicating the relative gain of the watermark signal The height of the bar graph varies as the watermark signal gain is measured However the I character in the returned value does not represent a measure ment or status value currentAudioDelay D or F value displayed in Use this object to view the amount of dynamic Decode mode or fixed audio delay the instrument is currently using to correct any existing A V delay measuredAudioDelay A V measurement value dis Use this object to view the current amount of played in Decode mode audio delay the instrument is measuring currentSourcelD Source ID value displayedin Use this object to view the current source ID Decode mode decoded from the watermark on the video input SourcelD Configuration menu Use this object to view or change the output status for the watermark encoder of the source 1 Encoder ID a Source ID modifySourcelD Con
57. DC100 However in some cases the A V delay will exceed the default correlation window required by the instrument to produce valid measurements The default measurement window for A V delay is 30 video fields Therefore if your system has static A V delay of 10 fields the instrument will produce valid measurements However in the event of a large static video delay for example a satellite network system that exceeds 30 video fields a fixed default audio delay must be set to bring the measurement correlation window within the 30 fields range For example if a static video delay of 100 fields is present at the instrument input the instrument should be configured for a fixed audio delay of 100 fields This internal fixed audio delay is analogous to using an external audio delay unit to optimize the audio correlation window for valid A V delay measurements and correction Figure 3 3 shows how adjusting the default audio delay results in varying ranges of audio delay correction AVDC100 Audio Video Delay Corrector User Manual 3 9 Reference 150 fields 120 fields 90 fields Actual Correction Range Default Audio Delay Setting 30 fields Actual audio correction 0 fields no delay range automatic mode when the instrument correction range is set 60 fields 30 fields to 30 fields 30 fields 120 fields 90 fields 60 fields L 90 fields 120 fields maximum delay Figure 3 3 Au
58. Mode Configuration menu 2 Decoder b Correction Range Configuration menu 2 Decoder c Default Audio Delay Configuration menu 2 Decoder d Manual Delay Configuration menu 2 Decoder e On Loss of WM Configuration menu 3 Remote Control a SNMP Access Configuration menu 3 Remote Control c Modify Community String Configuration menu 3 Remote Control d Trap Address Configuration menu 4 Serial Port a Baud Rate Configuration menu 4 Serial Port b Flow Control Configuration menu 5 Network a Config Mode Use this object to view or set the delay correc Integer range 0 30 in tion range used by the AVDC100 units of video fields Use this object to view or set the default Integer range 0 120 in audio delay correction inserted by the units of video fields AVDC100 Use this object to view or set the amount of Integer range 0 150 in manual audio delay correction inserted by the units of video fields AVDC100 Use this object to view or set how the holdToLastValue AVDC100 responds when the instrument detects a loss of the watermark signal it is using to measure and or adjust A V delay decayToDefault Use this object to view or set whether or not readonly the instrument settings can be changed from a remote location by the network manager read write Use this object to view or set the community ASCII string string used by the AVDC100 to authenticate all queri
59. Rate 300 1200 2400 4800 9600 19200 38400 5 Network b Flow Control Software Xon Xoff None c Modify Comm String A Z 0 9 lt sp gt _ d Trap Address 0 9 e On Loss of WM Hold Last Value Decay to Default a Config Mode Manual DHOP Server 6 All Settings b IP Address Edit or view only 0 9 a Save Setup 1 Setup 2 Setup 3 Setup 4 b Restore Setup 1 Setup 2 Setup 3 Setup 4 Factory Figure 2 6 Menu tree for the Configuration menu c Subnet Mask d Gateway Edit or view only 0 9 Edit or view only 0 9 AVDC100 Audio Video Delay Corrector User Manual e Show DHCP Server Not Available or shows address f Show MAC Address Shows MAC address 2 27 Operating Basics BOOT 1 Network a Config Mode b IP Address Manual Edit or DHCP Server view only 0 9 2 MAC Address a Shows MAC address 3 Versions c Subnet Mask d Gateway Edit or Edit or view only view only 0 9 0 9 a Firmware b Hardware c BootROM X X X X X X 4 Update Firmware Press to start Performs firmware update and reboots instrument 5 Reboot Press to start Exits the Boot menu and reboots instrument Figure 2 7 Menu tree for the Boot menu 2 28 AVDC100 Audio Video Delay Corrector User Manual Operating Basics Status LEDs The AVDC100 pro
60. Repackaging for Shipment 0 0 cee eee eee eee C 2 Troubleshooting Techniques 0 0 c ee cee cece eee eens C 4 Firmware Upgrades cc cee cue vee one kiti e Sone ewe ecu Sade Sate eS C 5 Appendix D Functional Verification 00 e eee eee D 1 TestIntetval a dinni nne a a hades Ape ia ee whe ee Sama tee Sead es D 1 Test Prerequisites cra sce ees eed ae ARE a BAGS ae u D 1 Test Usage and Conventions 0 cece eee eee ees D 2 Required Test Equipment e eri rers cirar ccc cee eee eee D 3 Electrical Characteristic Tests 2 0 0 eee eee eee eee D 4 Basic Functional Tests sasi eri cea aea ARE ccc cece eens D 14 Enhanced Functional Tests 0 0 ee cece cee eens D 23 AVDC100 Audio Video Delay Corrector User Manual Table of Contents List of Figures Figure 1 1 Figure 1 2 Figure 1 3 Figure 1 4 Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 Figure 2 8 Figure 2 9 Figure 3 1 Figure 3 2 Figure 3 3 audio delay settings Figure 3 4 Figure 3 5 Figure 3 6 in a terrestrial broadcast plant Figure 3 7 Figure 3 8 Figure 3 9 Figure B 1 Figure B 2 Figure B 3 Figure B 4 Figure B 5 Figure B 6 Figure D 1 Figure D 2 functional tests Figure D 3 functional tests AVDC100 front panel cece eee eee eee Installing rubber feet stand alone installation only Installing the single instrument rackmount
61. S not present sdi deserializer TRS not present at lt xx xx xx xx gt or No LTC Timecode sdiDeserializerEdh SDI deserializer EDH present sdi deserializer EDH present at lt xx xx xx xx gt or No LTC Timecode SDI deserializer EDH not present sdi deserializer EDH not present at lt xx xx xx xx gt or No LTC Timecode watermarklsPassive Watermark encode mode turns passive water mark is passive at lt xx xx xx xx gt or No LTC Timecode Watermark encode mode turns active water mark is active at lt xx xx xx xx gt or No LTC Timecode 1 The notification messages take the following form trap message followed by at followed by either xx xx xx xx timecode in hours minutes seconds and video frames or by No LTC Timecode AVDC100 Audio Video Delay Corrector User Manual B 11 Appendix B Remote Control Network Troubleshooting Basic Requirements Networks are based on standards however there are many unique characteristics of each network LAN or WAN that make it difficult to troubleshoot without a thorough knowledge of the specific network Consequently in depth network troubleshooting should be performed by an expert who knows the characteristics of your network installation This section provides some basic procedures that can eliminate some of the more common sources of network errors The information in this section is organized as indicated in the following list m Basic Requirements m IP Parameter
62. Select button to make menu selections Press the associated menu button again to exit the menu NOTE Once you have displayed a menu you must press the associated menu button to clear the menu display The instrument will then return to the default display for the currently selected operating mode Encode Decode or Bypass AVDC100 Audio Video Delay Corrector User Manual 2 1 Operating Basics Mode Button Press the Mode button to access the Mode menu where you can switch the instrument between the following operating modes Encode Mode Use this mode to enable the instrument to permanently encode the input video signal with a watermark that enables the measurement of A V delay and contains a user defined source ID Instrument operation in Encode mode is as follows m The instrument encodes one watermark onto the video signal Some portions of the watermark pattern are used to encode the source ID information and other portions are used to encode the A V delay measurement information m When you turn off the source ID or you remove the audio signal input used to encode the A V delay information the AVDC100 will still encode a watermark but the watermark will not include the respective data of the source ID and or the A V delay measurement information m Ifthe AVDC100 detects a no video condition while in Encode mode the instrument uses a relay bypass to feed through the video signal input to the video output connector Th
63. The error code may be requested by the Tektronix customer service representative who assists you in resolving the problem with your firmware upgrade AVDC100 Audio Video Delay Corrector User Manual C 11 Appendix C User Service Verifying the Upgrade Table C 2 Types of firmware upgrade errors Type of error Internal error Connection closed Invalid package data Data format error Update failure Description An internal error should be reported to your local Tektronix customer service representative along with the error code and a description of what you were doing when the error occurred The network connection terminated prematurely This may be caused by killing the data transfer utility on the PC or by network errors The firmware upgrade data was corrupted or was not appropriate for the current instrument The firmware data file was corrupted or was not a properly formatted firmware data file An unclassified firmware update error After you have completed the firmware upgrade the instrument should reboot properly and come up in an operational mode NOTE When you perform a firmware upgrade the Readme txt file that is included with the firmware upgrade package will document whether all of the current Configuration menu and instrument mode settings are preserved To verify the functional performance of your instrument perform the procedures located in Appendix D Functional Verification AVDC
64. U se the arrow buttons to select 2 DECODER a Delay Correction and se the arrow buttons to select Manual delay correction and then press se the arrow buttons to select 2 DECODER d Manual Delay and se the arrow buttons to set the manual audio delay to 0 Fields and then press the Select button Press the CONFIG button to clear the menu display AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Verify the Initial Setup Perform the following checks to verify that you connected the instruments properly in the initial setup procedure 1 On the DUT AVDC100 check for the following conditions m The DECODE LED is illuminated m The VIDEO and AUDIO status LEDs are green On the REF1 AVDC100 check for the following conditions m The ENCODE LED is illuminated m Both the VIDEO and AUDIO status LEDs are green On the REF2 AVDC100 check for the following conditions m The DECODE LED is illuminated m Both the VIDEO and AUDIO status LEDs are green On the digital audio monitor check for the following conditions m All four bars are peaking together at 3 second intervals m Lissajous appears as a bursting ellipse On the digital video monitor check for the following conditions m A locked Eye pattern display with 800 mV amplitude m The Serial Alarm light Red is OFF AVDC100 Audio Video Delay Corrector User Manual D 27 Appendix D Functional Verification Enhanced Fun
65. Unfortunately most MPEG 2 compression systems do not have a tracking audio delay corrector to make up for these variable delays in the video buffer Consequently the delay correction must be performed somewhere downstream in the video signal path In principle MPEG 2 decoding of the correct lip sync relationships is straight forward However in practice lip sync errors can still occur because of fixed systematic errors fixed delays can cure this problem and lip sync errors incurred from decoding errors video gaps and splices These conditions can affect the accuracy of the PTS decoding by MPEG decoders Terrestrial Broadcast Plant The terrestrial broadcaster receives programming from many outside sources including OB Outside Broadcast news trucks and remote production studios These remote video sources feed programming into the central broadcast facility over many means including satellite fiber cable microwave and ISDN There are also many video frame synchronizers and compression CODECs in the network as well which process the video and create latency in the signal path Once the program enters the central broadcast facility and is edited it is then sent out to the affiliate station for final distribution to the end viewer Figure 3 6 on page 3 15 shows the locations throughout a typical broadcast plant where an AVDC100 would be installed AVDC100 Audio Video Delay Corrector User Manual Reference Digital Watermark
66. User Manual Tektronix 7 AVDC100 Audio Video Delay Corrector 071 0860 00 This document applies to firmware version 1 0 www tektronix com Copyright Tektronix Inc All rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Tektronix Inc P O Box 500 Beaverton OR 97077 TEKTRONIX and TEK are registered trademarks of Tektronix Inc WARRANTY Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If a product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is lo
67. VE machines add a generally predictable fixed delay 33 66 99 132 ms If there is synchronized A V content a compensating audio delay must be inserted Correcting video delay caused by DVE machines can be problematic when the DVE unit is dynamically inserted and removed from the video signal path Compensation of variable delay requires you to either dynamically alter the audio delay without imposing significant audio artifacts difficult or to have predetermined audio delays automatically switch in and out with the DVE effect However few if any master controls provide for dynamic delay compensation Audio signal processing is usually minimal and only adds short inconsequential delays Processes such as equalization and filtering create audio delays that are typically less than 1 ms Generally audio processing delays do not require you to add video delay to compensate for audio processing delay MPEG 2 Compression Systems MPEG 2 compression systems cause A V delay errors primarily during archiving or distribution of television programming Audio to video synchronization in MPEG 2 refers to maintaining the relative timing of the video and audio elements during the decompression process MPEG 2 transport streams have embedded time base information that is used to set a clock in the MPEG 2 decoder Picture and sound frames have time stamps indicating their presentation time PTS Presentation Time Stamp The data representing picture an
68. _1 is therefore able to find the correct addresses for TVTest_2 and Rennes in spite of having an incorrect subnet mask TVTest_1 cannot communicate with Carnac because according to the subnet mask on TVTest_1 Carnac and TVTest_1 are logically on the same network Consequently messages sent from TVTest_1 to Carnac are never routed Because these two devices do not share a medium TVTest_1 will never find the correct address for the network on Carnac and will not be able to reach Carnac B 14 AVDC100 Audio Video Delay Corrector User Manual Appendix B Remote Control Incorrect default gateway IP address The default gateway you have specified in the AVDC100 is the device that knows about your subnetwork and others on your network When you send messages for example traps from your AVDC100 to a device on another subnet the default gateway is able to route the message to the appropriate subnet If the IP address specified is incorrect messages to devices on other subnets will not reach their destination because they never made it to the default gateway IP address 128 181 96 201 Subnet mask 255 255 255 0 Default gateway 128 181 96 1 AVDC100 Carnac IP address 128 181 96 1 Gateway router Gateway router IP address 128 181 99 1 AVDC100 AVDC100 AVDC100 Rennes TVTest 2 TVTest 1 IP address 128 181 99 82 IP address 128 181 99 72 IP address 128 181 99 62 Subnet mask 255 255 255
69. al B 1 Appendix B Remote Control Configuring the AVDC100 for SNMP Operation You must set the following parameters on the AVDC100 so that the instrument can communicate over your LAN Ethernet network m Method used by your LAN to assign IP addresses manual or DHCP m IP address assigned to the AVDC100 including the subnet mask and gateway addresses m IP Address of the network manager m SNMP access permissions granted to the network manager Community string for the authentication of queries from the network manager The Ethernet parameters of the AVDC100 are configured using selections in the Configure menu Refer to Table 2 8 on page 2 19 and Table 2 10 on page 2 21 for information about the remote control and network configuration settings that you can set on the instrument Network IP Address The AVDC100 must be configured for the method used by your LAN Ethernet Method network when IP addresses are assigned to connecting machines Use the 5 Network a Config Mode selection in the Configuration menu to set the method to one of the following modes Manual Mode Use this setting if your AVDC100 has been assigned a static network address The AVDC100 will use the IP address subnet mask and gateway parameters you enter into the instrument DHCP Server Mode Use this setting to obtain network configuration parameters from a DHCP server One or more DHCP servers must be running on your network to use this setting To
70. alue determines the center of the automatic delay correction range You can set the default audio delay from 0 to 120 video fields Any automatic or manual A V delay added by the instrument will be in addition to any delay value set by this menu selection If your video signal path produces known A V delay errors you can use this menu setting to compensate for the known delay If the amount of A V delay error is greater than the instrument can correct or if the delay is so great that the instrument cannot find enough correlation between the video and audio signals you can adjust this setting to bring the A V delay within the range needed for the instrument to function NOTE For correct A V delay measurement and adjustment the default audio delay must be set not more than 30 video fields of the correct value Refer to Reference starting on page 3 1 for more information about how to configure the instrument when the A V delay in your video distribution system is large Use this setting to manually compensate for measured A V delay You can set the manual audio delay from 0 to 150 video fields When the instrument is decoding in the automatic delay correction mode use this setting to configure how the instrument responds when it detects a loss of the watermark signal on the video input Hold Last Value This setting configures the instrument to continue using the last valid A V delay measurement as the basis for A V delay correction
71. and correct A V delay and or to identify the video source ID NOTE A V delay correction can only be performed by the AVDC100 when the video signal is delayed in time relative to the audio signal The AVDC100 can measure A V delay when the video is advanced in time relative to the audio but cannot correct that type of A V delay When the AVDC100 corrects A V delay the instrument adjusts the delay at the rate of one video field per second Bypass Mode Use this mode to bypass the instrument in the video signal path In this mode both the video and audio input signals are passed through the instrument without any signal processing Signal bypassing occurs automatically when the instrument is powered off Status Button Press this button to open the Status menu in which you can view the status of various instrument monitoring functions You can view the status of the AES receiver time code receiver SDI receiver SDI deserializer watermark signal and audio signal Refer to Status Menu on page 2 10 for a description of the status displays for each of these instrument functions Test Button Press this button to open the Test menu in which you can test certain functions of the instrument or upgrade the instrument firmware Refer to Test Menu on page 2 13 for a description of the functions available using this menu Config Button Press this button to open the Configuration menu in which you set the various functional parameters that
72. ast measured value or it will decay the A V delay to a default value You set these recovery options in the Decoder settings of the Configuration menu This message is displayed when there is a repeated nSync condition This usually indicates that there is no watermark present in the video input or that the watermark is severely corrupted This message can be displayed when the A V Delay LED is red When this condition occurs while the instrument is set to automatic delay correction the instrument will either hold the A V delay to the last measured value or it will decay the A V delay to a default value You set these recovery options in the Decoder settings of the Configuration menu This message is displayed when there is an excessive loCor condition This usually indicates that the audio input does not match the audio signature in the watermark This message can be displayed when the A V Delay LED is red This condition may be caused by an incorrect audio input or by misaligned audio input Misaligned audio may be corrected by setting a default delay value when using automatic delay correction or by adjusting the manual delay value when using manual delay correction You set these options in the Decoder settings of the Configuration menu When this condition occurs while the instrument is set to automatic delay correction the instrument will either hold the A V delay to the last measured value or it will decay the A V delay to a de
73. ating an IP address you will see a temporary IP address that will automatically update when the instrument obtains a final address from a DHCP server Use the arrow buttons to highlight and then change each number in the IP address to a number ranging from 0 to 9 Press the Select button to save the modified IP address Use this setting to view or edit the network subnet mask address assigned to the instrument by your network administrator Use the left and right arrow buttons to select between valid subnet masks until the address matches the one assigned by your network administrator The number displayed after the character represents the size of the network portion of the selected subnet mask Use the up or down arrow to cancel the selection or press the Select button to save the modified subnet mask Use this setting to view or edit the network gateway address assigned to the instrument by your network administrator The gateway address is the network address of a network router which can route data packets to other local networks The gateway address is checked by the instrument against the IP address and subnet mask addresses If the network portion of the gateway address as determined by the subnet mask does not match the network portion of the IP address the instrument will not accept the gateway address Use the arrow buttons to highlight and then change each number in the gateway to a number ranging from 0 to 9 P
74. avigate you through the upper level of a displayed menu the numbered selections and the horizontal arrow buttons will navigate you through the lower level of a menu the lettered selections Use the Select button to make menu selections NOTE When you access a menu the menu display defaults back to the menu selection you last accessed when you where in that menu the previous time You can then use the arrow buttons to navigate to a different menu selection Press the Mode button to open the Mode menu which allows you to change the operating mode of the instrument between Encode Decode and Bypass Refer to Mode Button on page 2 2 for more information Press the Status button to open the Status menu see Figure 2 5 on page 2 26 which allows you to observe the status of various instrument functions using the following menu selections 1 AES Receiver Use this Status menu selection to display one of the following status messages about the audio input m No Errors Displayed when the AES Receiver detects no errors m Validity Error Displayed when the AES Receiver detects a sample that has the validity bit set m CRC Error Displayed when the AES Receiver detects a CRC error m Parity Error Displayed when the AES Receiver detects a parity error m Unlocked Displayed when the AES Receiver cannot lock to the audio input AVDC100 Audio Video Delay Corrector User Manual Operating Basics 2 Time Code Receiver Use this
75. ay settles adjusts at the rate of one video field per second 7 On the DUT AVDC100 check that the display reads AV 100 and F 80 AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Automatic A V Delay Correction Tests NOTE The following checks determine that automatic delay correction can pull in from both sides of a fixed delay setting 1 On the DUT AVDC100 set the controls as follows m Set the default audio delay to 80 Fields Use the Configuration menu 2 DECODER c Default Audio Delay setting Press the Select button m Set the delay correction mode to Automatic Use the Configuration menu 2 DECODER a Delay Correction setting Press the Select button m Set the audio delay correction range to 30 Fields Use the Configura tion menu 2 DECODER b Correction Range setting Press the Select button m Set the loss of watermark signal recovery type to Decay to Default Use the Configuration menu 2 DECODER e On Loss of WM setting Press the Select button m Press the CONFIG button to clear the menu display 2 Wait for about 2 3 minutes while the AVDC100 instrument delay settles adjusts at the rate of one video field per second 3 On the DUT AVDC100 check that the display reads AV 100 and D 100 4 On the REF2 AVDC100 set the manual delay to be 90 Fields Use the Configuration menu 2 DECODER d Manual Delay setting Press the Select button 5 On
76. ay within the 30 fields of correla tion range required by the instrument see Figure 3 4 on page 3 11 You are within range when the A V delay LED turns yellow or green 11 After the A V Delay LED turns yellow or green note the A V delay measurement on the instrument display Figure 3 5 shows what the measurement readout would look like for the example video program shown in Figure 3 2 on page 3 8 The A V delay measurement is 24 fields representing that the video is delayed 24 fields relative to the audio The F 24 indicates that the instrument is manually delaying the audio by 24 video fields NOTE The A V delay measurement represents the timing of the video signal in relation to the audio signal at the inputs to the instrument An A V delay value of 24 fields indicates that the video is delayed 24 fields in relation to the audio AV 24 Flds ID TEKSTUDIO Figure 3 5 Example A V delay measurement display AVDC100 Audio Video Delay Corrector User Manual 3 13 Reference 12 If you will be operating the instrument in automatic delay correction mode perform the following steps otherwise proceed to step 13 a Set the instrument to automatic delay correction mode Use the Configuration menu 2 Decoder a Delay Correction setting b Set the amount of default audio delay to the value noted in step 11 This value would be 24 in the example from Figure 3 2 on page 3 8 Use the Configuration menu 2 Decoder c D
77. button Use the multi function knob to highlight the Phase Display submenu and then press any soft button to open the menu Set the following parameters in the Phase Display submenu m Format LISSAJOUS SOUND STAGE m Pair A Left channel assignment 1 m Pair A Right channel assignment 3 Return to the Top menu by pressing the associated soft button Use the multi function knob to highlight the Input submenu and then press any soft button to open the menu Set the following parameters in the Input submenu m CH 1 2 input BNC unbalanced m CH 3 4 input BNC unbalanced Press the Clear Menu button to clear the menu display Select the following front panel control settings m View Audio m Meter Scale Normal m Phase Display A AVDC100 Audio Video Delay Corrector User Manual D 25 Appendix D Functional Verification 5 On the WFM601M digital video monitor set the controls as follows a Set the input channel to Serial A b Set the display mode to Eye C Set the sweep rate to Line 6 On the REF1 AVDC100 select Encode mode Press the MODE button to clear the menu display 7 On the REF2 AVDC100 select Decode mode Press the MODE button to clear the menu display 8 On the DUT AVDC100 set the controls as follows a b Select Decode mode Press the CONFIG button to open the Configuration menu U then press the Select button U the Select button U then press the Select button
78. cated Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES EEE Table of Contents General Safety Su
79. chased from Tektronix If you lose your original packaging material contact your Tektronix representative to obtain replacement packaging AVDC100 Audio Video Delay Corrector User Manual Appendix C User Service Repackaging Instructions When you ship the AVDC100 it is important to provide the instrument with the maximum protection Whenever possible use the original packaging that was shipped with the instrument If you do not have the original packaging material you can obtain new packaging material from Tektronix If for some reason you cannot obtain original packaging material follow these packaging instructions 1 Obtain a carton of corrugated cardboard having inside dimensions six or more inches greater than the dimensions of the instrument Use a shipping carton that has a test strength of at least 275 pounds 2 Surround the instrument with a protective bag antistatic preferred If the instrument is not in a cabinet wrap a cardboard piece around the bagged instrument to protect components 3 Pack dunnage or urethane foam between the instrument and the carton If using Styrofoam kernels overfill the box and compress by closing the lid There should be three inches of tightly packed cushioning on all sides of the instrument 4 Seal the carton with shipping tape industrial stapler or both AVDC100 Audio Video Delay Corrector User Manual C 3 Appendix C User Service Troubleshooting Techniques C 4 Po
80. ctional Tests Perform the following procedures to verify the enhanced functional performance of the AVDC100 Manual A V Delay Measurement Tests 1 Onthe REF2 AVDC100 set the controls as listed below m Set the manual audio delay to 25 Fields Use the Configuration menu 2 DECODER d Manual Delay setting Press the Select button m Press the CONFIG button to clear the menu display 2 Wait a minute to allow the delay changes to stabilize in the DUT AVDC100 3 On DUT AVDC100 display check that the display reads AV 25 and F 0 NOTE You may notice occasional loCor or other messages when the A V Delay LED turns yellow indicating errors Occasional errors are normal Continuous errors are not normal If you see similar error messages continuously check the settings on the digital audio generator for a burst signal output with a 1000 Hz 500 ms burst signal and a 3 second period 4 Onthe REF2 AVDC100 set the controls as follows m Set the manual audio delay to 100 Fields Use the Configuration menu 2 DECODER d Manual Delay setting Press the Select button m Press the CONFIG button to clear the menu display 5 Onthe DUT AVDC100 set the controls as follows m Set the manual audio delay to 80 Fields Use the Configuration menu 2 DECODER d Manual Delay setting Press the Select button m Press the CONFIG button to clear the menu display 6 Wait for about 2 3 minutes while the AVDC100 instrument del
81. d sound frames are sent prior to their scheduled presenta tion time The MPEG 2 decoder must correctly use the PTS time stamps to accurately schedule decoding and presentation of the video Therefore lip sync errors in MPEG 2 systems can be absolutely corrected in that the mechanism for doing so exists However this is often not the case The MPEG 2 stream can be analyzed for correct sync but proper correction requires that the MPEG 2 decoder uses the PTS correctly to ensure accurate lip sync timing in the decoding process The MPEG 2 encoder is responsible for inserting the PTS time stamps correctly Video and audio encoders can have significant delays with the delay depending on the particular model of encoder that is used and how well that encoder processes various types of motion AVDC100 Audio Video Delay Corrector User Manual 3 3 Reference For example if a video scene changes abruptly from a static scene with no motion for several seconds to a panning scene with high motion the abrupt change of motion causes virtually every frame to be encoded as an I frame This puts severe stress on the compression engine as it attempts to compute how best to encode every I frame This in turn causes the encoding buffer to fill creating increased video latency through the processing engine When the video scene becomes static the buffer empties very rapidly decreasing the amount of video latency because there is little motion to encode
82. dio correction range at various default audio delay settings After you first apply the video and audio signals of the video program that you want to A V delay correct to the instrument inputs the following possible timing correlation conditions exist when either the default or manual delays are set to 0 fields Optimum Correlation The optimum correlation condition exists when there is 100 overlap of the correction range and the video delay as shown at the top of Figure 3 4 With this condition the total measurement range is 30 fields when 0 fields is set as the default or manual delay with a total automatic correction range of 30 fields Partial Correlation The partial correlation condition exists when there is only 20 30 overlap of the correction range and the video delay as shown in the middle of Figure 3 4 With this condition depending on the dynamic range and type of audio in the program for example background noise versus speech the A V delay measurements may periodically fail to update consistently and the measurement accuracy will decrease You will see consistent loCor messages indicating a low audio correlation condition To compensate for a partial correlation condition and to increase measure ment accuracy and update consistency adjust the default or manual audio delay value to match the fixed system delay This allows the automatic correction function in the instrument to slew around the static system delay usi
83. ducts should be used only in the environment for which they are rated Pollution Degree 1 No pollution or only dry nonconductive pollution occurs Products in this category are generally encapsulated hermetically sealed or located in clean rooms Pollution Degree 2 Normally only dry nonconductive pollution occurs Occasionally a temporary conductivity that is caused by condensation must be expected This location is a typical office home environment Temporary condensation occurs only when the product is out of service Pollution Degree 3 Conductive pollution or dry nonconductive pollution that becomes conductive due to condensation These are sheltered locations where neither temperature nor humidity is controlled The area is protected from direct sunshine rain or direct wind Compliance was demonstrated to the following specification as listed in the Official Journal of the European Union Low Voltage Directive 73 23 EEC amended by 93 68 EEC EN 61010 1 A2 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use UL3111 1 Standard for Electrical Measuring and Test Equipment CAN CSA C22 2 No Safety Requirements for Electrical Equipment for Measurement 1010 1 Control and Laboratory Use ISA S82 02 01 1999 Safety Standard for Electrical and Electronic Test Measuring Controlling and Related Equipment IEC61010 1 A2 Safety Requirements for Electrical Equipment for Measurement Control and
84. e A V watermark signal To remove the A V delay watermark data remove the audio input from the encoding AVDC 100 d Set WM Intensity Use this menu selection to set the watermark signal intensity level to 1 2 or 3 with 1 being the lowest level and 3 being the highest The ability of the watermark signal to survive video processing and its potential for visual detection increase as the watermark intensity level increases 2 16 AVDC100 Audio Video Delay Corrector User Manual Operating Basics 2 Decoder Use this Configuration menu selections to change the Decoder settings listed in Table 2 7 Table 2 7 Decoder configuration settings Menu selection Description Automatic Use this setting to configure the AVDC100 to automatically correct the measured A V delay a Delay Correction In automatic correction mode the A V delay measurements are centered around the default audio delay value The instrument can measure and correct A V delays ranging about 30 video fields from the center value The accuracy of the A V delay correction decreases as difference between the center delay value and the measured delay value increases The automatic correction of AN delay is adjusted at the rate of one video field per second Manual Use this setting to configure the AVDC100 to measure AN delay and to allow the audio delay correction to be set manually using the Manual Delay setting In manual delay correction mode the audio is dela
85. e Coaxial cable BNC male to BNC male Tektronix part number All 24 in quantity 6 012 1339 00 BNC T connector Male to two females one required Tektronix part number Enhanced 103 0030 00 BNC barrel connector Female to female one required Tektronix part number Enhanced 103 0028 00 75 Q termination Termination impedance 75 Q Tektronix part number All Connector BNC male Two required 011 0102 01 Headphones 1 4 inch jack EEE Electrical AVDC100 Audio Video Delay Corrector User Manual D 3 Appendix D Functional Verification Electrical Characteristic Tests The electrical verification procedures require no additional known good AVDC100 instruments to the AVDC100 to be tested These procedures check the following electrical characteristics of the instrument m Video output jitter and amplitude m Video signal integrity m Watermark signal amplitude m Video standard recognition 525 line and 625 line Audio signal input and output m Time code receiver m Input cable length for no bit errors Refer to Test Usage and Conventions on page D 2 for operator information before you perform these tests Initial Equipment Setup Perform the following steps to set up the test equipment for the electrical tests 1 Connect the test equipment as shown in Figure D 1 LTC Time TSG601 Digital SDI Video Code Generator or Video Generator Cable Clone Distribution Source SDI out In LTC out SDin LTCIn SDlout SER A In XLR
86. e digital video monitor scan to Line 23 On the digital video monitor check that there is no watermark signal present on Line 23 On the digital video monitor scan back to Line 24 On the DUT AVDC100 enter the Test menu and select 1 TOGGLE a Encoder On the DUT AVDC100 use the Select button to toggle the watermark signal On and Off Check the results on the digital video monitor Waveform display mode Check that when the watermark signal is Off the watermark signal noise you observed in step 4 is removed Only the normal 10 bit quantizing should be noticeable On the digital video monitor select Picture display mode On the DUT AVDC100 use the Select button to toggle the watermark signal On and Off Check the results on the digital video monitor Picture display mode Check that as you use the Select button to toggle the watermark signal On and Off you cannot observe any glitches on the digital video monitor display On the digital video monitor select Waveform display mode AVDC100 Audio Video Delay Corrector User Manual D 9 Appendix D Functional Verification 13 14 15 16 17 18 19 20 On the digital audio generator temporarily turn off the audio signal output use the MEN button on the AM70 On the digital video monitor check after about 20 seconds that the ampli tude of the watermark signal noise drops noticeably On the digital audio generator restore the tone burst signal ou
87. e instrument will return to encoding when a video signal is detected You can configure the watermark encoder to operate in one of the following two modes m Is Always On Use this setting to force the AVDC100 to always encode the video signal with a watermark even if the instrument detects an existing watermark in the video input signal CAUTION To prevent damage to an existing watermark and to prevent the watermark you are encoding from being corrupted and unusable do not use the Is Always On setting for the Encoder unless you are sure that your video input signal does not contain a previous watermark encoded by an AVDC100 Adding a new watermark to video that contains an existing watermark encoded by an AVDC100 will render both the previous and new watermarks unusable and will increase the likelihood of watermark visibility m If No Watermark Detected Use this setting to encode the video signal with a watermark only when the instrument does not detect an existing AVDC100 watermark in the video input signal The watermark encoder switches off when it detects an existing watermark and switches back on when it no longer detects the existing watermark This is the recommended setting AVDC100 Audio Video Delay Corrector User Manual Operating Basics Decode Mode Use this mode to enable the instrument to decode a previously encoded watermark from the video input signal The instrument can use the decoded watermark to measure
88. e only to aid internal Tektronix personnel who use this manual When you select Serial Port from the Configuration menu you can change the serial port settings listed in Table 2 9 Table 2 9 Serial Port configuration settings Description Displays the baud rate currently used by the RS 232 port Menu selection a Baud Rate To change the baud rate use the arrow buttons to display the desired rate and then press the Select button You can select from the following baud rates 300 1200 2400 4800 9600 19200 and 38400 Displays the method of flow control currently used by the RS 232 port To change the flow control method use the arrow buttons to display the desired method and then press the Select button b Flow Control Software Xon Xoff Use this setting to prevent the receiving machine from losing characters being transmitted by the AVDC100 None Use this setting when the instrument being controlled does not support Xon Xoff flow control 2 20 AVDC100 Audio Video Delay Corrector User Manual Operating Basics 5 Network When you select Network from the Configuration menu you can change the network settings listed in Table 2 10 These settings configure how the AVDC100 communicates with Network Management Stations over your LAN Ethernet network Refer to Appendix B Remote Control for information about how to use the AVDC100 over your LAN Ethernet network NOTE The Config Mode IP Address
89. e various parameters listed below on the network manager Refer to the user documentation of your network manager for details about how to set these parameters m Device Name Enter the user friendly name assigned to the instrument on your network m SNMP Version The AVDC100 currently supports SNMP v1 v2 B 4 AVDC100 Audio Video Delay Corrector User Manual Appendix B Remote Control m Address Family Enter the address family of the SNMP for the AVDC100 running on the UDP IP stack The address family tells the network manager to which transport protocol the SNMP is bound m Network Address Enter the IP address assigned to the AVDC100 Time Out Interval Enter the wait period between SNMP queries This value is typically set in milliseconds m Retry Count Enter the number of times the network manager will resend queries in case of communication failure m Request Port Enter the number of the AVDC100 destination port which is a standard UDP port The request port on the AVDC100 is defined to be 161 You cannot change this default value m Notify Port Enter the number of the AVDC100 notification port for receiving notifications traps from the SNMP agent The notification port on the AVDC100 is defined to be 162 You cannot change this default value Community String The AVDC100 authenticates all the queries from a network manager Each query from the network manager is accompanied by a context for authentication of the
90. ed b 525 4 2 2 625 4 2 2 H Pixel offset for start following minutes seconds or No Video of WM signal Shows audio activity meter and video frames c TRS Present or V TV line number for Validity Error No LTC Time Code TRS Not Present start of WM signal CRC Error d EDH Present or G Gain meter for Parity Error EDH Not Present WM signal Unlocked 525 or 625 525 line or 625 line video TEST 1 Toggle On Off 2 Zone Plate 3 Initiate Test 4 Firmware Upgrade a Encoder On or Off a Level 1 8 a LEDs are Normal a Reboots Instrument b Audio Delay On or Off LEDs All Green Escape Reboot opens the Boot menu c Zone Plate On or Off LEDs All Yellow LEDs All Red Figure 2 5 Menu trees for the Mode Status and Test menus 2 26 AVDC100 Audio Video Delay Corrector User Manual Operating Basics CONFIG 1 Encoder a Source ID Source ID Is On Source ID Is Off 2 Decoder b Modify Source ID A Z 0 9 lt Sp gt _ c Watermark Encode Is Always On If No WM Detected d Set WM Intensity To WM Level 1 To WM Level 2 To WM Level 3 a Delay Correction Automatic Manual b Correction Range 0 30 Fields 3 Remote Control c Default Audio Delay 0 120 Fields d Manual Delay 0 150 Fields a SNMP Access Read Only Read Write 4 Serial Port b Community String Is Shows name a Baud
91. eeing the associated action It is the unnatural feeling of delayed video that is very annoying and causes viewers to complain about A V delay AVDC100 Audio Video Delay Corrector User Manual 3 1 Reference 3 2 Causes of A V Delay Errors Over time as video distributors have attempted to compensate for A V delay errors a number of values for A V sync tolerance have been used as informal rule of thumb guidelines in various parts of the video industry m Within a video frame m Audio can be half a video frame early to a video frame late m Audio can be 20 ms early to 40 ms late m Film editors can detect half a video frame 16 20 ms of A V delay Because the A V delay rules were informal and were not consistently applied by all of the video distributors in 1994 the International Telecommunication Union ITU established a group to investigate A V timing errors The group developed test conditions and proposed a plan for the testing of lip sync errors Subjective testing with skilled and non skilled test subjects was performed in several countries In 1995 the test results were published and in 1998 recommendation ITU R BT 1359 1 was issued which summarized their viewer test results as follows m Threshold for reliable detection of sound timing errors by a viewer 45 ms early 125 ms late m Threshold for acceptability of sound timing errors 90 ms early 185 ms late m Timing delta to move sound timing errors from detectab
92. efault Audio Delay setting c Set the automatic correction range to be n fields where n is the range of variable A V delay you expect from your video source Use the Configuration menu 2 Decoder b Correction Range setting NOTE Although the instrument will operate properly with the correction range set at the maximum 30 fields reducing the correction range to the minimum value necessary can reduce any A V delay effects caused by incorrect A V delay measurements 13 If you will be operating the instrument in manual delay correction mode adjust the amount of manual audio delay to the value noted in step 11 This value would be 24 in the example from Figure 3 2 on page 3 8 Use the Configuration menu 2 Decoder d Manual Delay setting 3 14 AVDC100 Audio Video Delay Corrector User Manual Reference Typical Installations The following pages show how the instrument can be installed in terrestrial broadcast plants in video production studios in remote production trucks and in the program input to the video production studio from a satellite downlink Figure 2 9 on page 2 32 shows the typical signal connections to the AVDC100 for each of the instrument operating modes Terrestrial Broadcast Figure 3 6 illustrates the locations throughout a typical broadcasting plant that Plant an AVDC100 would be installed AVDC100 watermark encoders are used in the facilities supplying video content as close to the program originat
93. ek com 128 181 399 881 with 32 bytes of data Request timed out Request timed out Figure B 4 Ping exe command window Ping only runs briefly and the DOS window closes when the process completes AVDC100 Audio Video Delay Corrector User Manual Appendix B Remote Control Tracing the route of TCP IP packets Sometimes it is helpful to know how far your packets made it on the way to a destination machine and which devices the packets pass through on the way The utility that provides this functionality is tracert exe Tracert can also indicate a congested point in the network To run tracert use the following procedure 1 Select Run from the Start menu The Run dialog box appears 2 Type one of the following into the Run text box tracert machineName tracert IPaddress In the examples above machineName and IPaddress represent the host machine name and IP address respectively of the networked device you are trying to reach 3 Click OK A DOS window appears see Figure B 5 indicating the progress of your packets The far right column indicates the IP address of the nodes on the network that successfully pass your tracert packets This information indicates the last good node on the path to the destination device Ma C WINNT4S ystem32 tracert exe Tracing route to ibm com 264 146 38 99 over a maximum of 38 hops lt 18 ms lt 18 ms lt 16 ms rs39aU1d6 ens tek com 128 181 240 2 lt 18 lt 18 lt 18 ri a
94. ements of SMPTE 259M for 270 Mbps signals 525 line 60 Hz 625 line 50 Hz SDI video only Launch amplitude is the signal level at the driven end of a cable or cable simulator For correct instrument operation in Bypass and Decode operating modes the video output signal from the instrument must be terminated in 75 Q Encode mode Internally terminated in 75 Q Decode and Bypass modes When externally terminated in 75 Q at the Serial Video output Decode and Bypass modes only A 3 Appendix A Specifications Table A 3 Serial Video port Cont Characteristic Supplemental information Output Port A 4 Meets requirements of SMPTE 259M for 270 Mbps signals Connector BNC 75 Q Bit Rate Encode mode Locked to the 270 Mbps Serial Video input Decode and Bypass modes Via relay contacts from the Serial Video input Signal Amplitude 720 mV 880 mVp p into 75 Q Encode mode Output amplitude input signal amplitude less 25 meters of Belden 8281 cable Output Configurations Encode mode 75 Q source impedance For correct instrument operation in Bypass and Decode operating modes the video Decode and Bypass modes Via relay output signal from the instrument must be contacts to the Serial Video input terminated in 75 Q Bypass mode Default mode in the event of loss of power Return Loss gt 15 dBm minimum from 1 MHz to 270 MHz Encode mode only with respect to 75 Q 20 to 80 Rise and Fall Times 400 ps to
95. en select F1 Use the up and down arrow keys to set the output signal to BURST Use the left and right arrow buttons to set the frequency of the burst to 1000 Hz and then press ENTER Press the MENU key and then select F2 Use the number keys to enter 01150 1150 ms as the period of repetition and then press ENTER Press the MENU key and then select F3 Use the number keys to enter 00500 500 ms as the burst width and then press ENTER AVDC100 Audio Video Delay Corrector User Manual D 5 Appendix D Functional Verification D 6 4 On the 764 digital audio monitor set the controls as follows a b Press the MENU button to display the Top menu Use the multi function knob to highlight the Level Meters submenu and then press any soft button to open the menu Set the following parameters in the Level Meters submenu m Display mode 4 Channels m Interpolation ON m Ballistics True Peak Return to the Top menu by pressing the associated soft button Use the multi function knob to highlight the Phase Display submenu and then press any soft button to open the menu Set the following parameters in the Phase Display submenu m Format LISSAJOUS SOUND STAGE m Pair A Left channel assignment 1 m Pair A Right channel assignment 3 Return to the Top menu by pressing the associated soft button Use the multi function knob to highlight the Headphones submenu and then press any soft button to open the menu
96. ens tek com 128 181 1 2 lt i lt 18 lt 18 r63a ens tek com 1 2 65 3 6 lt 18 ms lt 18 ms lt 16 ms rs6b3a en k com 134 62 1 31 Request i out Reques i out Reques i out out out out out out out out KDKEKKKKKKKKEK so oo KWKKKKK KKK KK 264 146 SKEK KEKE KK KK 1 2 3 4 5 6 2 8 9 18 11 12 13 14 15 16 a Figure B 5 Tracert exe command window AVDC100 Audio Video Delay Corrector User Manual B 17 Appendix B Remote Control Finding IP addresses for devices on your network At times you may need to find or confirm the IP address of a computer on your network or conversely the network name if all you have is an IP address You may want to find this information to ensure that IP addresses and network names you use in the Hosts file are correct The utility that will display this information is nslookup exe Use nslookup as described below 1 Point to the Start button and then select MSDOS The command line interface appears 2 Enter one of the the following commands and press Enter where machineName or IP address is the network name or IP address respec tively of the device you are trying to lookup m nslookup machineName m nslookup IP address The network name and IP address of the device you are trying to lookup is displayed If your network uses DNS the IP address and network name of the DNS server is also displayed See Figure B 6 N Command Prompt Mic
97. eo Delay Corrector User Manual A 7 Appendix A Specifications Certifications and Compliances Table A 10 EMC certifications and compliances Category Standard EC Declaration of Meets intent of Directive 89 336 EEC for Electromagnetic Compatibility and Low Voltage Directive 73 23 ECC Conformity EMC for Product Safety Compliance was demonstrated to the following specifications as listed in the Official Journal of the European Communities EN 55103 Environment Part 1 EN 55022 EN 55103 1 Annex A EN 55103 1 Annex B Part 2 IEC 61000 4 2 IEC 61000 4 3 IEC 61000 4 4 IEC 61000 4 5 IEC 61000 4 6 IEC 61000 4 11 EN 55103 2 Annex A EN 61000 3 2 Product family standard for audio video audio visual and entertainment lighting control apparatus for professional use E2 commercial and light industrial Emission Class B Radiated and Conducted Emissions Radiated magnetic field emissions Inrush Current Immunity Electrostatic Discharge Immunity RF Electromagnetic Field Immunity Electrical Fast Transient Burst Immunity Power Line Surge Immunity Conducted RF Immunity Voltage Dips and Interruptions Immunity Radiated Magnetic Field Immunity AC Power Line Harmonic Emissions Low Voltage Directive 73 23 EEC amended by 93 68 EEC EN 61010 1 A2 1995 Safety requirements for electrical equipment for measurement control and laboratory use Australia New Zea Complies with EMC Framework and demonstrated per Emi
98. er NOTE This cord is not 061 0066 11 identical to the China cord Option AC North America Option A4 220 V Tektronix part number 061 0066 12 AVDC100 Audio Video Delay Corrector User Manual 1 5 Options and Accessories Accessories 1 6 Table 1 1 Power cord identification Cont Option and part number Switzerland Option A5 230 V Plug configuration Tektronix part number 061 0154 00 China 230 V Option AC Tektronix part number NOTE This cord is not 061 0304 00 identical to the Australian cord Option A3 Table 1 2 lists standard and optional accessories that are available for the instrument Table 1 2 Standard and optional accessories mounts two AVDC100 instruments side by side in a standard 19 inch equipment rack Power cord Tektronix Accessory partnumber Standard Optional AVDC100 user manual 071 0860 XX m AVDC100 user reference card 071 0874 XX Rubber feet Qty 8 348 0844 00 for stand alone installation of instrument Single rackmount kit 020 2405 XX mounts one AVDC100 instrument into a standard 19 inch equipment rack Zero clearance dual rackmount kit TVF16 u AVDC100 Audio Video Delay Corrector User Manual Installation This section provides instructions for installing and configuring the AVDC100 A V Delay Corrector for use in your digital video system Instructions are included for installing the instrument either in a stand alone or instrument
99. er AVDC100 up stream in the video signal path The source ID characters are repeatedly displayed in a sequential manner as the watermark signal is decoded As each letter of the source ID is initially received from the video input the letter blinks three or four times to highlight which character is being received Once you have received a complete valid Source ID determined by an internal CRC check then the following sequence is performed 1 The source ID display disappears for 1 2 second 2 The complete source ID is displayed 3 Each time an end of source ID character is received the source ID display is erased and the last known valid source ID is displayed with the last character received blinking AVDC100 Audio Video Delay Corrector User Manual Operating Basics Using TEK as an example source ID the following sequence would be displayed as the instrument initially decodes the source ID watermark 1 T The T blinks 2 TE The E blinks 3 TEK The K blinks 4 The screen blanks for 1 2 second CRC check is performed 5 TEK Appears not blinking if the CRC check passes 6 TEK The T blinks 7 TEK The E blinks 8 TEK The K blinks This sequence continues until a new or different source ID is received and validated by the internal CRC check If a new source ID such as BOB appears on the video input to replace the existing TER source ID in this example then the sou
100. er to Encode Mode on page 2 2 for an overview about watermark encoding Table 2 6 Encoder configuration settings Menu selection Description a Source ID Source ID Is On Is displayed when the source ID output is enabled When the source ID output is enabled the source ID you entered into the AVDC100 using the following Encoder menu selection will be watermarked onto the video signal Source ID Is Off Is displayed when the source ID output is disabled b Modify Source ID Displays the current source ID Use the arrow buttons to highlight and then change each individual character in the source ID string You can assign a source ID string of up to 15 characters Press the Select button to save the modified source ID Press any front panel button to exit this menu selection without modifying the source ID You can assign each source ID character to be one of the following A Z 0 9 lt sp gt _ c Watermark Encode Is Always On Use this setting to force the AVDC100 to always encode the video signal with an A V delay measurement watermark even if the instrument detects an existing watermark in the video input signal Refer to the Caution on page 2 2 If No WM Detected Use this setting to limit the AVDC100 to encode the video signal with an A V delay measurement watermark only when the instrument does not detect an existing watermark in the video input signal NOTE There is no menu selection to turn off the encoding of th
101. eristics Table A 8 Mechanical characteristics Characteristic Classification Overall Dimensions Height Width Length Weight Rack Space Description Transportable platform intended for either rackmount or bench applications 1 7 in w o feet 4 3 cm 8 1 in 20 6 cm 17 4 in 44 2 cm 4 Ib 0 oz 8 8 kg 1 rack unit high 1 2 rack width standard length Environmental Characteristics Table A 9 Environmental characteristics Characteristic Cooling Method Required Clearance Use Rating Atmospherics Temperature Operating Nonoperating Humidity Operating Nonoperating Altitude Operating Nonoperating Description Convection or conduction See Atmospherics Temperature Operating requirements Top and Bottom 0 inches 0 cm Rear 4 inches 10 2 mm Left or Right clearance 3 inches 7 6 cm Rated for indoor use only 0 C to 50 C 30 C hr max gradient noncondensing derated 1 C per 1 000 ft above 5 000 ft altitude derated to 35 C maximum ambient when three or more instruments are stacked with zero vertical clearance 40 C to 71 C 30 C hr max gradient 20 to 80 relative humidity noncondensing Max wet bulb temperature 29 C at 50 C derates relative humidity to 25 at 50 C 5 to 90 relative humidity noncondensing Max wet bulb temperature 29 C at 50 C derates relative humidity to 20 at 50 C Up to 9 842 ft 3 000 m Up to 40 000 ft 12 190 m AVDC100 Audio Vid
102. es are Line 23 for 525 line video and Line 24 for 625 line video When in Decode mode it is normal for this number to occasionally change NOTE The watermark position display is intended to verify the performance of the instrument It is not intended to be an accurate measure of actual video position shift or distortion Displays the gain of the watermark signal in the form of a vertical bar graph indicating the relative presence of a usable watermark The height of the bar graph varies as the watermark signal gain is measured Greater gain enables more accurate decoding 525 is displayed when the instrument detects a 525 line digital video input signal 625 is displayed when the instrument detects a 625 line digital video input signal NOTE A valid SDI video stream input is required for the instrument to properly set itself for 525 line or 625 line measurements 6 Audio Display Use this Status menu selection to display an audio activity meter representing the relative gain of both AES audio channels left and right AVDC100 Audio Video Delay Corrector User Manual Operating Basics Test Menu Press the Test button to access the Test menu The Test menu allows you to test certain instrument functions and to upgrade the instrument firmware using the following menu selections 1 Toggle Use this Test menu selection to test the instrument by toggling the functions listed in Table 2 4 on and off Table 2 4 Test menu Toggle
103. es received from a network manager Use this object to view or set the IP address of IP address in the following the network manager This IP address will be form XXX XXX XXX XXX referenced by the AVDC100 to communicate with the network manager over the network Use this object to view or set the baud rate to bps300 be used by the RS 232 port bps1200 bps2400 bps4800 bps9600 bps19200 bps38400 Use this object to view or set the method of softwareXonXoff flow control to be used by the RS 232 none Use this object to view or set the method used manualMode by your LAN Ethernet network for assigning IP addresses to connecting machines DHCPserver AVDC100 Audio Video Delay Corrector User Manual B 9 Appendix B Remote Control Table B 1 Definition of the MIB objects for SNMP remote control Cont Corresponding menu selec Entered or returned tion or display element Description values MIB object ipAddress subnetMask gateway showDhcpServer showMacAddress saveSetting restoreSetting Configuration menu 5 Network b IP Address Configuration menu 5 Network c Subnet Mask Configuration menu 5 Network d Gateway Configuration menu 5 Network e Show DHCP Server Configuration menu 5 Network f Show MAC Address Configuration menu 6 All Settings a Save Configuration menu 6 All Settings a Restore Use this object to view or set the IP address IP address
104. escription Use this setting to set the instrument to the method used by your LAN Ethernet network to configure machines that connect to the network Manual Mode Use this setting if your instrument has been assigned a static network address The instrument will use the IP address subnet mask and gateway parameters you enter DHCP Server Use this setting to obtain network configuration parameters from a DHCP server One or more DHCP servers must be running on your network to use this setting Use the left and right arrow buttons to display the desired mode the up and down arrow buttons to cancel the selection and the Select button to change the configuration mode AVDC100 Audio Video Delay Corrector User Manual 2 23 Operating Basics Table 2 11 Network configuration settings Boot menu Cont Menu selection b IP Address c Subnet Mask d Gateway 2 24 Description Use this setting to view or edit the IP address assigned to the instrument by your network administrator Manual Mode If the instrument is set to Manual mode in the Config Mode menu selection described above you can view or edit the IP address assigned to the instrument by your network administrator DHCP Server Mode If the instrument is set to DHCP Server mode in the Config Mode menu selection described above you can only view the IP address that was dynamically assigned to the instrument by the network If the instrument is still negoti
105. esentation which would require bandwidth in excesses of the watermarking data channel technology The audio envelope itself is not encoded only the variation within the envelope After the video is encoded by the first instrument the watermarked video and the original program audio enter the network processing and distribution paths where lip sync error can develop The audio and video signals of a program usually exit the network processing paths with the video delayed relative to the audio Now the audio and video signals of the program are routed to a downstream AVDC100 which is configured to decode the watermarked video The video signal is sampled by the instrument and the previously encoded watermark is detected The embedded data words are decoded and compared with data words similarly synthesized from an audio envelope variation facsimile extracted from the active audio signal The two data words are compared for timing correlation and any timing slippage is a direct quantitative indication of lip sync error The timing slippage is measured and the value is used by an internal audio delay circuit to continually re time the audio signal in reference to the video signal The A V delay measure ment and correction values are updated every two seconds AVDC100 Audio Video Delay Corrector User Manual 3 7 Reference Audio Correlation The accuracy of the A V delay correction depends on how much correlation the instrument can detect
106. fault value You set these recovery options in the Decoder settings of the Configuration menu AVDC100 Audio Video Delay Corrector User Manual 2 7 Operating Basics 2 8 Dynamic or Fixed Delay Value This readout displays either D n or F n where n is the delay value D n dynamic delay is displayed when automatic delay correction is selected in the Decoder settings of the Configuration menu You can set the default audio delay for the automatic mode to 0 120 video fields NOTE When the AVDC100 corrects A V delay the instrument adjusts the delay at the rate of one video field per second F n fixed delay is displayed when manual delay correction is selected in the Decoder settings of the Configuration menu The manual delay correction range is 0 150 video fields Watermark Gain Meter This vertical bar graph M displays the gain of the watermark signal indicating the relative presence of a usable watermark The height of the bar graph varies as the watermark signal gain is measured Greater gain enables more accurate decoding Number of Audio Errors A number between 0 9 is displayed to represent the relative number of correctable errors detected in the audio data The letter E is displayed when there are too many audio data errors for the instrument to correct Source ID The instrument readout displays the source ID decoded from the video input signal if the signal was previously watermarked by anoth
107. figuration menu Use this object to modify the source ID to be encoded on the video input 1 Encoder b Modify Source ID waterMarkEncode Configuration menu Use this object to view or change the condition used by the AVDC100 for insertion of the 1 Encoder watermark c Watermark Encode SetWaterMarkintensity Configuration menu Use this object to set the watermark signal intensity level to be used by the encoder 1 Encoder d Set WM Intensity delayCorrection Configuration menu Use this object to view or change the delay correction mode used by the AVDC100 2 Decoder a Delay Correction Entered or returned values Displays the status of the watermark signal in the following form same as instrument display H XX V XX GI 525 H XX V XX GI 625 Integer range 0 150 in units of video fields Integer range 0 150 in units of video fields ASCII string on off ASCII string ifNoWaterMarkDetected isAlwaysOn toWaterMarkLevel1 toWaterMarkLevel2 toWaterMarkLevel3 automatic manual B 8 AVDC100 Audio Video Delay Corrector User Manual Appendix B Remote Control Table B 1 Definition of the MIB objects for SNMP remote control Cont Corresponding menu selec Entered or returned tion or display element Description values MIB object correctionRange defaultAudioDelay manualDelay onLossOfWaterMark snmpAccess communityString trapAddress baudRate flowCtrl config
108. from 30 to 150 video fields with a total audio delay correction range of up to 150 video fields m Provides status information using a 2 line 20 characters per line vacuum fluorescent display in combination with four front panel status LEDs The status information about the video and audio signals includes the presence or loss of signal validity errors CRC errors parity errors TRS and EDH status unlocked audio or video conditions 525 line or 625 line standard detection and horizontal and vertical picture offset of the watermark signal m Zone plate signal generation m Provides a 10Base T LAN Ethernet interface for SNMP control of instrument settings signal monitoring A V delay correction and firmware upgrades from a remote PC Refer to Appendix B Remote Control for information about remotely operating the instrument m Provides a SMPTE Longitudinal Time Code input XLR female to be used for time stamping of status information retrieved via remote control The LTC time code can also be displayed on the instrument front panel m Recovers full instrument operation after a loss of power AVDC100 Audio Video Delay Corrector User Manual 1 3 Product Description Primary Applications 1 4 Provides real time processing of a single channel of a 10 bit 27 Mhz SDI video stream 270 Mb 525 625 line serial component Provides real time processing of a 48 kHz stereo 24 bit synchronous AES digital audio stream A
109. gnal generator change the signal format to 525 line still use Shallow Ramp signal On the DUT AVDC100 set the manual delay to 30 fields Use the Configuration menu 2 DECODER d Manual Delay setting Wait a minute to allow the delay changes to stabilize in the DUT AVDC100 On the digital audio monitor check that the Lissajous still appears with a circle or ellipse along with the two straight lines On the digital audio generator reset the burst width to 500 ms On the digital audio monitor check that the circle or ellipse on the Lissajous has disappeared This concludes the basic verification procedures for the AVDC100 AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Enhanced Functional Tests The enhanced functional tests in this section require two additional known good AVDC100s in addition to the AVDC100 under test to check the following instrument functions m A V delay measurement accuracy m Automatic A V delay correction NOTE Perform the procedures in Basic Functional Tests beginning on page D 14 using only one additional known good AVDC100 to verify the watermark encoder and decoder functions and to verify that the audio delay is embedded properly Refer to Test Usage and Conventions on page D 2 before you perform these tests for operator information Initial Equipment Setup Perform the following steps to set up the test equipment 1 Connect the test equ
110. h memory programming AVDC100 Audio Video Delay Corrector User Manual Appendix C User Service 8 After programming the flash memory the instrument reads back the data from the flash memory to verify the installation While the flash memory is being verified the instrument displays the following message Programming Done Verifying Flash The Verifying Flash message only appears briefly 9 After verifying the programming of the flash memory the AVDC100 displays the following message and reboots the instrument Update Complete Rebooting The instrument should reboot properly and come up in an operational mode Upgrade Errors When you abort the firmware update after it has started the following message appears on the instrument display to indicate that the operation aborted Press any button to clear the error message and return to the Boot menu Firmware Update Aborted by User If a problem is encountered while the AVDC100 is updating the firmware the instrument displays an error message in the format shown below Press any front panel button to clear the error message and return to the Boot menu lt Type of Error gt B xxxxxx Unn Table C 2 lists the various Type of Error messages you may encounter NOTE The B xxxxxx Unn display is an internal error code that identifies the specific type and location of the firmware upgrade error x character code reference n code number Make a note of this error code
111. hardware AVDC100 rear panel connectors 0ee00 AVDC100 front panel cece eee eee ence Sample display readout in Encode mode Sample display readout in Decode mode Sample display readout in Bypass mode Menu trees for the Mode Status and Test menus Menu tree for the Configuration menu Menu tree for the Boot menu ee eens AVDC100 rear panel connectors eeeeee Typical signal connections for each operating mode Intra video data channel technology diagram Audio correlation diagram ceeeeeeeee Audio correction range at various default Examples of the possible audio correlation conditions Example A V delay measurement display Typical watermark and A V correction points Typical in studio installation eeeeeees Typical remote truck installation Typical studio input decode correct installation Incorrect IP address cc cee ccc ce crcceecee Incorrect subnet mask 00 c cece eee ce eens Incorrect default gateway IP address Ping exe command window cecececevees Tracert exe command window eeseeeeeces Command prompt with nslookup results Initial equipment connections for the electrical tests Initial equipment connections for the basic Initial equipment connections for the enhanced AVDC100 Audio Video Delay Corrector User Manual
112. he active program 7 advanced 24 fields f Positive correlation Audio signal used i 7 video watermark 24 field no 24 field no correlation correlation Time 0 Figure 3 2 Audio correlation diagram 3 8 AVDC100 Audio Video Delay Corrector User Manual Reference Audio correlation can be noted by the amount of A V delay offset between the two waveforms within the two second sample see Figure 3 2 The 24 field region of no correlation caused by A V delay reduces the number of video fields available for positive correlation which is required for A V delay measurements As the amount of A V delay increases the amount of audio available to be correlated for measurement decreases The instrument displays loCor error messages when the audio correlation reaches a minimum threshold Maximizing Audio Correlation To maintain enough audio correlation to be used for A V delay measurements you should adjust the default audio delay automatic correction mode or the manual audio delay manual correction mode in the instrument to match as closely as possible the actual delay in the video program In the example shown in Figure 3 2 you would set the default or manual audio delay to be 24 video fields When you first connect the video and audio signals of your video program to the AVDC100 the instrument begins to make valid A V delay measurements assuming that the video program was previously watermarked by another AV
113. igurable source ID which allows you to embed valuable video content with a permanent ID code The ID code can be later decoded by another AVDC100 to provide verification of program play out or to identify the source of the video Refer to Reference starting on page 3 1 for detailed information about how the instrument watermarks the video signal and then uses the watermark to measure and correct A V delay Complete lip sync correction using digital watermarking requires two AVDC100 instruments the first set to Encode mode and located upstream in the signal path embeds the subliminal digital watermark the second set to Decode mode and located downstream in the signal path extracts the embedded watermark and then measures and corrects A V delay When encoding the instrument embeds data words representing a facsimile of the audio envelope variation into the video at the programming source When decoding the instrument extracts the data words from the watermarked video signal compares them to data words representing a facsimile of the audio envelope variation extracted from the active audio signal and then corrects for A V delay using one of two delay correction modes Automatic In automatic mode the instrument feeds back the measured A V delay value into an internal audio delay circuit and automatically corrects lip sync errors The normal adjustment rate is one video field per second However using the Test mode you can instantl
114. iguration menu 2 Decoder b Correction Range setting 6 Set the default audio delay to 0 fields Use the Configuration menu 2 Decoder c Default Audio Delay setting 7 Press the Config button to close the menu display 8 Allow time for the instrument delay measurements to settle AVDC100 Audio Video Delay Corrector User Manual Reference 9 Check that all of the status LEDs are illuminated green The A V Delay LED might occasionally turn yellow This is an expected condition and is usually caused when the audio signal has periods of silence or has too low of a dynamic range to allow valid audio correlation A yellow A V Delay LED condition is usually temporary and will return to green when the normal audio dynamic level return 10 If the A V Delay LED remains red then one of the two following conditions exists m The audio program applied to the instrument has zero correlation to the audio signal encoded with the video signal This is usually an indication that an incorrect audio signal is applied to the instrument m The A V delay at the input to the instrument exceeds the default audio correlation window 30 fields In this situation an unknown amount of fixed delay is required To correct this condition observe the video program and then use the Manual Delay setting to eliminate any apparent lip sync error Use the Configuration menu 2 Decoder d Manual Delay setting This will usually bring the A V del
115. ing Digital watermarking is a technology developed in the early 1990s which refers to the subliminal hiding of data within a digital image Watermarking was developed to enable the copyright protection of intellectual property and to provide protection against counterfeit money Watermarking is also used for copyright management of still images over the Internet but has only recently been applied to digital video Solution to A V Delay The AVDC100 provides an automated solution to the A V delay correction in Video problem by using a patented digital watermarking technology developed by Tektronix This digital watermarking technology allows the instrument to encode a highly compressed transformed facsimile of the audio envelope variation extracted from the audio signal input as data words into the active picture portion of the video signal that is output from the instrument From that point on anywhere downstream in the program signal path another AVDC100 can compare the data words watermarked on the video signal with data words similarly synthesized from an audio envelope variation facsimile extracted from the active audio signal Any timing shift measured between the two data words is a quantitative indication of lip sync error The timing shift measurement is reported to the user via the front panel display and can be monitored from a remote location via a LAN Ethernet network The user can use the internal delay in the AVDC100 to manua
116. ion source as possible where the video and audio signals are most likely to be in time AVDC100 decoder correctors are used in the central broadcast facility to monitor all incoming feeds They can be configured to perform automatic corrections of any lip sync error that might have developed during the video back haul process The video is then re routed to the affiliate station were another AVDC100 decoder corrector is used to again corrector for any lip sync error before final distribution to the viewer Emm Correct er dela Correct Watermark or AN delay Correct AN delay Correct Watermark AN delay Correct AN delay Network Broadcaster Correct AN dela Correct t AN delay Correct AN delay Watermark or Potential N otentia lela A V delay i problem areas Content Creation Figure 3 6 Typical watermark and A V correction points in a terrestrial broadcast plant AVDC100 Audio Video Delay Corrector User Manual 3 15 Reference Studio Installation In the studio multiple AVDC100s can be installed on the router With LAN Ethernet network remote control multiple AVDC100s could be configured as needed see Figure 3 7 Watermarked SDI Video to Plant Archival SDI Video oan AES Audio Encode Decode i SDI Video Camera pin SDI Video AVDC100 IE AES Audio Encode Decode SDI Video AVDC100 AES Audio AES Audio Encode Decode AES Audio Audio Mix SDI Video
117. ipment as shown in Figure D 3 clearly mark the AVDC100 instruments used in this procedure This procedure uses three AVDC100 instruments Without using identifying marks you may misidentify the DUT device under test and the two reference instruments N CAUTION To prevent you from incorrectly performing this procedure be sure to This procedure refers to the three AVDC100 instruments in the following manner DUT AVDC100 REF1 AVDC100 and REF2 AVDC100 2 On the TSG601 digital video signal generator set the controls as follows to output a 625 line shallow ramp signal without an ID for this test any test signal expect Pluge will function a Hold down the Lock Out button while pressing the ON button to enter the Diagnostic menu b Use the 7 Format Select selection and the left and right arrow buttons to set the instrument to 625 line generation mode c Press the Test Signals button repeatedly to select the Shallow Ramp output signal d Press the ON button twice to set the TSG601 to normal operation mode e Press the ID On Off button to set ID generation to OFF AVDC100 Audio Video Delay Corrector User Manual D 23 Appendix D Functional Verification TSG601 Digital Video Generator SDI out SDI in SDI out SDI in SDI out SDI out SER A In REF2 AVDC100 REF1 AVDC100 WFM601M Digital Video BNC T connector Monitor with barrel adapter AES in AES out AES in DUT AVDC100 AES out
118. it allows you to mount two AVDC100 instruments side by side in a standard equipment rack with zero vertical clearance viii AVDC100 Audio Video Delay Corrector User Manual Contacting Tektronix Phone Address Web site Sales support Service support Technical support This phone number is toll free in North America After office hours please leave a 1 800 833 9200 Tektronix Inc Department or name if known 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA www tektronix com 1 800 833 9200 select option 1 1 800 833 9200 select option 2 Email techsupport tektronix com 1 800 833 9200 select option 3 1 503 627 2400 6 00 a m 5 00 p m Pacific time voice mail message Outside North America contact a Tektronix sales office or distributor see the Tektronix web site for a list of offices AVDC100 Audio Video Delay Corrector User Manual AVDC100 Audio Video Delay Corrector User Manual A Getting Started SSS Se ee Product Description This chapter familiarizes you with the capabilities key features and installation requirements of the Tektronix AVDC100 Audio Video Delay Corrector instrument This chapter is divided into the following sections m Product Description lists the feature set of the instrument and describes the primary applications for its use m Options and Accessories lists the available options and accessories you can order for the instrument Installation pr
119. ith respect to 75 Q Encode and Bypass modes When externally terminated in 75 Q at the Digital Audio input AVDC100 Audio Video Delay Corrector User Manual A 5 Appendix A Specifications Table A 5 LTC Time Code port Characteristic Input Connector Input Impedance Signal Characteristics Signal Amplitude Table A 6 Control and Data ports Characteristic LAN Port Serial Port Power Characteristics XLR balanced unterminated no loop through Pin 1 Chassis GND Pin 2 LTC Pin 3 LTC gt 10 kQ Longitudinal time code per IEC Publication 461 0 2 Vp p to 5 0 Vp p balanced differential 0 2 Vp p to 2 5 Vp p single ended RJ 45 LAN connector supporting 10Base T RJ 45 Pin assignments only Pin 1 TX Pin5 NC Pin 2 TX Pin 6 RX Pin3 RX Pin7 NC Pin 4 NC Pin 8 NC 9 pin D Sub female RS 232 DCE 3 wire no hardware handshake Pin 1 Chassis GND Pin 2 RxD Pin 3 TxD Pin 7 Signal GND Table A 7 AC power source characteristics Characteristic Source Voltage Maximum Power Consumption Fuse Rating A 6 Description 100 VAC 240 VAC 10 single phase continuous range CAT II 50 Hz 60 Hz 50 Watts maximum limit of power supply 19 Watts typical F4A 250 V internal Not operator replaceable Refer servicing to qualified service personnel AVDC100 Audio Video Delay Corrector User Manual Appendix A Specifications Mechanical Physical Charact
120. l starting position is pixel 15 but this value may vary AVDC100 Audio Video Delay Corrector User Manual A 1 Appendix A Specifications Table A 2 Watermark and A V delay correction characteristics Cont Characteristic Supplemental information AN Delay Measurements Digital video and audio signals must be Video signal requirement Must be a valid 525 line connected to the instrument or 625 line digital video signal Audio signal requirement Must be a valid digital audio signal and should contain typical speech and action audio material where sound to action timing errors can be most visible Measurement Accuracy 1 video field plus 5 of the magnitude The measured A V offset can be nullified eliminating of the measured A V offset the magnitude error by adding default or manual delay as a fixed offset Measurement Range Manual delay mode Within 30 video Timing relationship of the audio input signal with fields of the Manual Delay value which respect to the video input signal can be set from 0 to 150 video fields Automatic delay mode Within 30 video fields of the Default Audio Delay value which can be set from 0 to 120 video fields Measurement Resolution 1 video field Video Field Timing 525 line mode 16 667 ms per video field 625 line mode 20 0 ms per video field Automatic Audio Delay A valid 525 line or 625 line digital video signal must be connected to the instrument Correction Range 0
121. lays the status of the watermark decoder including the A V delay measurement Figure 2 3 shows a sample display readout of the Decode operating mode AV 1 Flds ID TEKSTUDIO Figure 2 3 Sample display readout in Decode mode instrument is in the Decode operating mode you must terminate the video signal The termination can be located at the output of the AVDC100 or downstream in the video signal path N CAUTION To prevent erroneous A V delay measurement and correction when the When the instrument is being used as an audio delay unit a valid SDI video sig nal is required for the instrument to properly set the measurement mode to 525 line or 625 line The 525 625 line measurement mode must be set correctly because the AVDC100 measures and corrects audio delay in amounts of video fields not milliseconds Setting the correct measurement mode automatically sets the correct field timing 16 667 ms per field in 525 line mode or 20 0 ms per field in 625 line mode When the instrument is set to Decode mode the following watermark decoder status information is displayed AN Delay Measurement Value This readout displays AV n Flds where n is the amount of video signal delay in video fields as measured at the signal inputs to the instrument An A V delay value of 24 fields indicates that the video is delayed 24 fields in relation to the audio at the inputs to the instrument NOTE Because the A V delay measurement is taken at
122. le to unacceptable 45 ms if sound early 60 ms if sound late Video delay can occur in broadcasting plants due to video processing A V delay skewing can also occur due to MPEG 2 compression during video distribution AN Delays in Broadcast Plants Significant video delays that occur in the broadcast plant are usually the direct result of video processing Video frame synchronizers add a variable delay while DVE Digital Video Effect machines usually add a fixed delay measured in video frames Generally broadcasters must add audio delay to compensate for the delay caused by in plant video processing A video frame synchronizer that is used to synchronize an outside broadcast to the in plant reference can cause variable A V delay 33 66 ms typical depending on the phase of the input video signal to the plant reference When frame synchronizers are used there must be a compensating audio delay inserted Ideally the audio delay should track the actual delay of the video but usually the audio delay is set to some nominal value of the video delay AVDC100 Audio Video Delay Corrector User Manual Reference For example the formula 33ms 66ms 2 50 ms accounts for the 50 ms delay value that is commonly used Using 50 ms as a fixed delay correction value reduces the potential of A V delay error to 16 ms In a cascade of frame synchronizers with compensating fixed audio delays some of the delay errors will cancel Likewise D
123. lection The AVDC100 authenticates all queries received from a network manager Each of these queries is accompanied by a context for authentication This context is called the community string or security name You must configure both the AVDC100 and the network manager with matching community string values to correctly authenticate queries c Modify Community String Displays the current community string Use the arrow buttons to highlight and then change each individual character in the community string Press the Select button to save the modified community string You can assign each of the 15 community string characters to be one of the following characters A Z 0 9 lt sp gt _ d Trap Address Displays the current trap address The trap address is the IP address of the network manager that will receive SNMP traps from the AVDC100 over a LAN Ethernet network Use the arrow buttons to highlight and then change each individual number in the address Press the Select button to save the valid IP address of the network manager You can assign each of the address digits a number ranging from 0 to 9 AVDC100 Audio Video Delay Corrector User Manual 2 19 Operating Basics 4 Serial Port The RS 232 port serves no operational function and is only used during the internal Tektronix manufacturing process of the instrument It is not intended for the remote control of the instrument These menu descriptions are included her
124. ll calculate the A V delay measurement value during this condition but automatic delay correction will not use the values until this condition clears AVDC100 Audio Video Delay Corrector User Manual Operating Basics Table 2 1 Error messages in Decoder mode Cont Error message wait wrAud AV Stalled No Watermark Wrong Audio Definition Waiting for data The instrument has just entered Decode mode and is collecting audio samples This message can be displayed when the A V Delay LED is yellow Wrong audio The instrument is recovering from a wrong audio signal condition which is caused by the audio input signal not matching the watermarked video signal This message can be displayed when the A V Delay LED is red The instrument will calculate the A V delay measurement value during this condition but automatic delay correction will not use the values until this condition clears This message is displayed when there is an excessive loCor loEnv or noDat error condition This message indicates that the A V delay measurement has not been updated for an extended period of time This message can be displayed when the A V Delay LED is red This condition may be caused by long periods of silence elevator music or by leaving the audio signal disconnected from the encoder When this condition occurs while the instrument is set to automatic delay correction the instrument will either hold the A V delay to the l
125. llows power input voltage range of 100 240V 50 60 Hz with no range switch The instrument was designed to provide a solution to A V delay problems and to provide a source ID in the following digital video environments Television Broadcasting Corrects lip sync errors within a plant caused by cascading signal formats frame synchronizers video and audio processing and video latency caused by varying signal paths Video Network Operations Corrects lip sync errors caused by excessive video processing Remote Truck Production Corrects lip sync errors in the contribution path back to the studio facility Video Content Production Ensures that the programming content is robust to lip sync errors and verifies program play out by encoding a source ID AVDC100 Audio Video Delay Corrector User Manual SE ee Ss Options and Accessories This section lists the orderable options and the standard and optional accessories provided with the instrument Options The only options currently available with the instrument are the power cord options listed in Table 1 1 Table 1 1 Power cord identification Plug configuration Option and part number North America and Japan Option Standard 115 V gt Tektronix part number Locking 061 0216 00 Europe Option A1 230 V x Tektronix part number Locking 061 0215 00 United Kingdom Option A2 230 V a Tektronix part number 061 0066 10 Australia Option A3 230 V Tektronix part numb
126. lly adjust the reported A V delay or the user can set the instrument to automatically delay the audio signal to adjust for any measured A V delay lip sync error Watermarking Figure 3 1 illustrates how the Tektronix patented watermarking process works Digital Video In this example there are eight watermarking patterns used each representing 1 bit in an 8 bit data word NOTE The signal level of the watermark patterns is below the threshold of viewer detectability and is often below the quantization noise level of profes sional video disk recorders The system used by the AVDC100 to apply watermarks to digital video is called intra video data channel technology because the data channel is internal or hidden in the video signal The watermark pattern is a three dimensional spread spectrum data modulation that creates a subliminal data channel that is tied to a video image sequence Each of the watermark patterns represents a binary bit 0 or 1 determined by the phase in which the pattern was added to the video signal With eight unique patterns an 8 bit data word can be represented There are 256 possible combina tions of data words AVDC100 Audio Video Delay Corrector User Manual 3 5 Reference Original image sequence gt There are 256 possible combinations of 8 bit data words represented by pattern sequences that are 3D and holographic A unique data word is represented by each pattern sequence
127. mation needed to control the operation configure the measurements and monitor the activity of the AVDC100 from a network management station Management information is viewed as a collection of managed objects Collections of related objects are defined in a MIB module that complies with the require ments of SNMP protocol Network Manager A computer running network management software for controlling a remote machine connected to the network SNMP Simple Network Management Protocol SNMP Agent An SNMP processing entity that conveys the management information between AVDC100 and a network manager Traps Notifications called traps are used to notify the remote network manager when predefined events have taken place within an instrument Watermark Subliminal data hidden within an image AVDC100 Audio Video Delay Corrector User Manual Glossary 1 Glossary Glossary 2 AVDC100 Audio Video Delay Corrector User Manual Index Index A A V delay Glossary 1 Causes 3 2 Configuration 3 12 Correction 3 7 Correction range 2 17 Measurement display 2 5 Accessories and options 1 5 Accuracy Glossary 1 Accuracy delay correction 3 8 Address Tektronix ix Applications 1 4 Arrow buttons 2 3 Audio correlation 3 8 Boot menu 2 23 2 28 Boot ROM version 2 25 Buttons Arrow 2 3 Config 2 3 Mode 2 2 Select 2 3 Status 2 3 Test 2 3 Bypass mode 2 3 C Certifications and compliances A 8 Cleaning
128. ment is set to DHCP Server mode in the Config Mode menu selection described above you can only view the IP address that was dynamically assigned to the instrument by the network If the instrument is still negotiating an IP address you will see a temporary IP address that will automatically update when the instrument obtains a final address from a DHCP server Use the arrow buttons to highlight and then change each number in the IP address to a number ranging from 0 to 9 Press the Select button to save the modified IP address 2 21 Operating Basics Table 2 10 Network configuration settings Configuration menu Cont Menu selection c Subnet Mask d Gateway e Show DHCP Server f Show MAC Address Description Use this setting to view or edit the network subnet mask address assigned to the instrument by your network administrator Use the left and right arrow buttons to select between valid subnet masks until the address matches the one assigned by your network administrator The number displayed after the character represents the size of the network portion of the selected subnet mask Use the up or down arrow to cancel the selection or press the Select button to save the modified subnet mask Use this setting to view or edit the network gateway address assigned to the instrument by your network administrator The gateway address is the network address of a network router which can route data packets to
129. mmary cc cece cece cece cece ee eeee v Preface ear ee a Er E et Vii Contacting Tektr onixt 22 iD La A ee al ix Getting Started Product Description ccc ccc cece cece rere rere eee nn en 1 1 Instrument Functionality zeas sasis inae eeraa cee cee eens 1 1 Key Features 2 0 2 Pate Van ia eis 1 3 Primary Applications 2 22 man 2 ar er und ala 1 4 Options and Accessories cc cece cece cece ec ee nennen 1 5 Installation 0 0 ccc ccc ccc cee cece cece eee e eter eeeeees 1 7 Stand Alone Installation ee ccc eee eens 1 7 Rackmount Installation ec ences 1 8 Power and Signal Connections 0 0 eee cece eee eens 1 11 Configuration 0 cece ccc cece cece cece ee eect een en nee 1 13 Setting the Operating Mode 0 0 cece cece eee ene eee 1 13 Configuring the Watermark Encoder 0 0 0 cece ee eee eee 1 13 Configuring the Watermark Decoder 00 cece eee eee eee ee 1 14 Setting the Network Parameters 0 2 0 c cece cee eee eee eee 1 14 Operating Basics Operating Basics 0 cece cece cece cece eee e cece eens 2 1 Front Panel Buttons 0 0 c eee eect cece eens 2 1 Display Readouts cid ache oie OR eis eae IR ER 2 4 Menu Commands 0 cece cece eect n eee ences 2 10 Statusi LEDS Sia cnt its eg ae Sel te a ns 2 29 Rear Panel Connections 0 cece cee ence een eens 2 30 Reference Reference n none
130. ng the optimum correlation condition AVDC100 Audio Video Delay Corrector User Manual Reference m No Correlation The no correlation condition exists when the A V delay in the program is outside of the default correlation window as shown at the bottom of Figure 3 4 With this condition the A V Delay LED will be consistently red To correct the no correlation condition adjust the default or manual audio delay setting in 20 field increments until you observe that the A V Delay LED turns yellow or green to indicate correlation of the program audio to the watermarked audio After the A V Delay LED turns yellow or green allow the instrument to measure the A V delay and then adjust the default of manual delay to the measured value effectively creating the optimum correlation conditon Time 0 30 fields 0 fields of default or manual delay 30 fields 0 fields of default or manual delay 30 fields 0 fields of default or manual delay Actual audio delay range 20 fields of variable delay used as an example Optimum Correlation Conditions Audio correction range 30 fields automatic mode Time 0 120 fields 60 fields ZT 90 fields of default or manual delay Partial Correlation Conditions Time 0 120 fields 60 fields 90 fields of default or manual delay No Correlation Conditions Time 0 120 fields 60 fields
131. ommunicate with the AVDC100 from another device AVDC100 AVDC100 AVDC100 Rennes TVTest 2 TVTest 1 IP address 128 181 99 62 IP address 128 193 99 2 IP address 128 181 99 62 Figure B 1 Incorrect IP address AVDC100 Audio Video Delay Corrector User Manual B 13 Appendix B Remote Control Incorrect subnet mask Subnets and subnetting networks are complex and require a thorough understanding of IP addressing Call your network administrator if you think your networking problem involves subnets Figure B 2 shows a simple and fairly common subnet mask problem In Figure B 2 the subnet mask for the AVDC100 named TVTest_1 indicates that the network address is contained in the first two bytes of the IP address In dotted decimal notation the network address is 128 181 This information allows the device to communicate with any other device with the same network address without being routed through a default gateway IP address 128 181 96 201 Subnet mask 255 255 255 0 AVDC100 fo Carnac Router AVDC100 AVDC100 AVDC100 Rennes TVTest_2 TVTest 1 IP address 128 181 99 82 IP address 128 181 99 72 IP address 128 181 99 62 Subnet mask 255 255 255 0 Subnet mask 255 255 255 0 Subnet mask 255 255 0 0 Figure B 2 Incorrect subnet mask TVTest_1 can communicate with TVTest_2 and Rennes because these three devices share a medium so messages from TVTest_1 do not need to be routed TVTest
132. or troubleshooting suspected problems with the instrument m Procedure to upgrade the firmware of the instrument Refer to Appendix D Functional Verification for procedures you can perform to verify the operation of the instrument Cleaning and Maintenance This section provides information about how to clean the instrument and how to perform preventive maintenance General Care Protect the instrument from adverse weather conditions The instrument is not waterproof CAUTION To avoid damage to the instrument do not expose it to sprays liquids or solvents Do not use chemical cleaning agents they may damage the instrument Avoid chemicals that contain benzene toluene xylene acetone or similar solvents Cleaning the Exterior Clean the exterior surfaces of the instrument with a dry lint free cloth or a soft bristle brush If dirt remains use a cloth or swab dampened with a 75 isopropyl alcohol solution A swab is useful for cleaning in narrow spaces around the controls and connectors Do not use abrasive compounds on any part of the instrument and use only enough solution to dampen the cloth or swab Use a 75 isopropyl fh CAUTION Avoid getting moisture inside the instrument during exterior cleaning alcohol solution as a cleanser and rinse with deionized water AVDC100 Audio Video Delay Corrector User Manual C 1 Appendix C User Service Preventive Maintenance It is recommended that you check the AVDC10
133. other local networks The gateway address is checked by the instrument against the IP address and subnet mask addresses If the network portion of the gateway address as determined by the subnet mask does not match the network portion of the IP address the instrument will not accept the gateway address Use the arrow buttons to highlight and then change each number in the gateway to a number ranging from 0 to 9 Press the Select button to save the modified gateway When you set the instrument network configuration to DHCP Server mode use this setting to view the IP address of the DHCP server providing the network configuration parameters to connecting machines You cannot edit the displayed IP address There may be more than one DHCP server on a network This option will display Not available in DHCP Server mode if the instrument is still negotiating for a DHCP lease or if it could not find a DHCP server A DHCP lease is a temporary network configura tion provided by a DHCP server for a finite period of time If the instrument is set to manual IP address mode the DHCP server address will display Not available Use this setting to view the MAC Media Access Control address assigned to your instrument by Tektronix Each AVDC100 is assigned a unique MAC address that you cannot edit You will use the MAC address to configure the remote network manager to communicate with the instrument 6 All Settings When you select
134. ovides procedures for installing the instrument in your digital video system either as a stand alone instrument or in your existing equipment rack m Configuration provides procedures for configuring the instrument settings for operation in your system Instrument Functionality The AVDC100 Audio Video Delay Corrector see Figure 1 1 is a half rack width 1RU high instrument designed for both the measurement and correction of audio to video A V delay commonly known as lip sync error in television broadcast and network digital video production and distribution systems The instrument uses a patented digital watermarking technology developed by Tektronix which embeds a subliminal data channel watermark into the active video to implement the A V delay measurement This technology allows you to install the instrument directly into the live video and audio program paths Once installed the instrument can monitor and correct static or variable lip sync errors in the digital video system Tektronix AVDC 100 A V DELAY CORRECTOR ee eee en DECODE DATA Ei FIG IE BYPASS a SEL gt MODE STATUS TEST CON Figure 1 1 AVDC100 front panel AVDC100 Audio Video Delay Corrector User Manual 1 1 Product Description 1 2 In addition to using the watermark for lip sync error measurement and correction the instrument also can embed a user conf
135. pendix comprise a valid confirmation of the functionality of the instrument when the following performance conditions have been met m The instrument must be operating in an environment with temperature altitude humidity and vibration within the operating limits described in Appendix A Specifications m The instrument must have had a warm up period of at least 20 minutes AVDC100 Audio Video Delay Corrector User Manual D 1 Appendix D Functional Verification Test Usage and Conventions D 2 Note the following usage requirements and procedure conventions before using the test procedures The test procedures are written to be performed from beginning to end If you attempt to perform a procedure out of sequence the test equipment settings may be different from those listed in the initial setup procedure You should refer to previous steps to check for changes in the test equipment settings These procedures are written for qualified personnel only It is assumed that you are familiar with test equipment in general The Initial Equipment Setup procedures are written in a detailed step by step style for the specific test equipment listed in Table D 1 This style can help you become familiar with operating the test equipment required for the other test procedures that follow each initial equipment setup procedure All other procedures are written in a brief style which makes the procedures easy to use for experienced operators
136. press the Select button Use the arrow buttons to select Manual delay correction and then press the Select button Use the arrow buttons to select 2 DECODER d Manual Delay and then press the Select button Use the arrow buttons to set the manual delay to 0 Fields and then press the Select button Press the STATUS button to open the Status menu Use the arrow buttons to select 6 AUDIO DISPLAY The audio meter should be displayed showing peaking bursts of audio activity AVDC100 Audio Video Delay Corrector User Manual D 7 Appendix D Functional Verification Verify the Initial Setup Perform the following checks to verify that you connected the instruments properly in the initial setup procedure 1 On the DUT AVDC100 check for the following conditions m The BYPASS LED is illuminated m The display shows the audio meter with both channels peaking together at 1 15 second intervals On the digital audio monitor check for the following conditions m All four bars are peaking together at 1 15 second intervals m Lissajous appears as a bursting vertical line On the digital video monitor check for the following conditions m A locked Eye pattern display with 800 mV amplitude m The Serial Alarm light Red is OFF Electrical Tests The following procedures verify the electrical performance of the AVDC100 Encode Mode SDI Output Jitter and Amplitude Tests 1 2 3 4 5 6 D 8 On the digital video moni
137. procedure in Configuring the Network Manager beginning on page B 4 to ensure that the network parameters on the network management station are correct Sources of Information If you need more information about network troubleshooting some potential resources are listed below NOTE These resources may provide you with more information This information is supplied as is with no warranty as to its fitness written or implied The best source of network troubleshooting help is your network administrator m Cisco Systems Inc http www cisco com This site is particularly useful for networks that use Cisco devices This URL was valid as of November 1999 m Dulaney E Lawrence S Scrimger R Tilke A White J Williams R Wolford K MCSE Training Guide TCP IP Indianapolis IN New Riders 1998 This is a training guide for Microsoft Certified Systems Engineer certifica tion and covers TCP IP and network troubleshooting m Taylor E Network Troubleshooting Handbook New York NY McGraw Hill 1999 AVDC100 Audio Video Delay Corrector User Manual B 19 Appendix B Remote Control B 20 AVDC100 Audio Video Delay Corrector User Manual See ee aes Appendix C User Service This appendix contains the following user service information to help you maintain your AVDC100 instrument m Procedures for cleaning and performing preventive maintenance m Procedure for repackaging the instrument for shipment m Techniques f
138. quipment setup exchange the positions of the REF AVDC100 and the DUT AVDC100 Refer to Figure D 2 on page D 15 Perform the procedure in Verify the Initial Setup on page D 19 Repeat steps 1 through 8 of the previous Decoder Operation procedure with the positions of the DUT AVDC100 and the REF AVDC100 reversed The test results should be identical if the DUT AVDC100 encoder is working normally In the test equipment setup return the REF AVDC100 and DUT AVDC100 to their original positions Refer to Figure D 2 on page D 15 Perform the procedure in Verify the Initial Setup on page D 19 Audio Delay Tests 1 On the REF AVDC100 change to Bypass mode CAUTION To ensure you perform this test correctly verify the following instrument settings these will already be set if you properly performed this procedure from the beginning On the digital video generator check that the signal format is 625 line On the DUT AVDC100 check that the delay correction mode is manual Use the Configuration menu 2 DECODER a Delay Correction setting On the digital audio generator check that the output is configured for a 1000 Hz 500 ms tone burst signal repeated every 1 15 seconds On the DUT AVDC100 change the following settings m Select Decode mode m Set the manual audio delay to 25 Fields Use the Configuration menu 2 DECODER d Manual Delay setting m Press the MODE button to clear the menu display On the DUT AVDC
139. r 13 On the headphones that you have connected to the digital audio monitor listen for a tone burst signal with pure tone and no distortion AVDC100 Audio Video Delay Corrector User Manual D 11 Appendix D Functional Verification Decode Mode Video Signal Detection Test 1 2 On the cable clone select 300 meters of cable On the DUT AVDC100 check that the VIDEO LED is no longer illuminated On the cable clone select 225 meters of cable On the DUT AVDC100 check that the VIDEO LED illuminates On the cable clone select 0 meters of cable Encode and Decode Modes LTC Time Code Receiver Tests Perform the following steps to check the operation of the time code receiver on the AVDC100 using an LTC time code generating instrument 1 2 8 9 Turn off the LTC generator On the DUT AVDC100 remove and reapply power or reboot the instrument Test menu 4 FIRMWARE UPGRADE Wait for the DUT AVDC100 to power up On the DUT AVDC100 check that the time code receiver displays No LTC Timecode Use the Status menu 2 TIME CODE RECEIVER setting Apply power to the LTC generator do not enable the time code output On the DUT AVDC100 check that the time code receiver now displays a time code value of 00 00 00 00 hours minutes seconds video frames On the LTC generator start the time code output On the DUT AVDC100 check that the time code starts incrementing On the LTC generator stop the time
140. ration configure the measurements and monitor the activity of the AVDC100 from a remote location using third party network management software Notifications called traps are used to notify the remote network manager when certain significant events have taken place within the instrument Refer to Table B 2 on page B 11 for a list of the events that will result in traps being sent to the network manager You can download the MIB used by the AVDC100 from the Tektronix website at the following URL http www tek com Measurement video audio From there follow the links to Software amp Drivers and then to Video Test to locate the AVDC100 MIB Management information in the MIB is viewed as a collection of managed objects Collections of related objects are defined in MIB modules that comply with the protocols for SNMP v1 v2 The AVDC100 MIB uses the following SNMP v1 v2 documents m Structure and Identification of Management Information for TCP IP based Internets rfc1065 A Simple Network Management Protocol rfc1157 m Concise MIB Definitions rfc1212 You can access SNMP reference information on the Internet at the following URLs http www cis ohio state edu Services rfc index html http www ietf org rfc html These URLs were valid as of March 2001 AVDC100 Audio Video Delay Corrector User Manual Appendix B Remote Control MIB Definitions The MIB of the AVDC100 contains objects commands that respond
141. rce ID display changes as the source ID is updated 1 BEK The B blinks 2 TOK The O blinks 3 TEB The B blinks 4 The screen is blanked for 1 2 second CRC check is performed 5 BOB Appears not blinking if the CRC check passes 6 BOB The B blinks 7 BOB The O blinks 8 BOB The B blinks This new sequence will continue until a new or different source ID is received and validated by the internal CRC check Bypass Mode Readouts When the instrument is set to the Bypass operating mode the readout displays the operating mode the firmware version number and the date and time of the firmware release Figure 2 4 shows a sample display readout when the instru ment is set to the Bypass operating mode Bypass Mode v1 0 3 14 01 Figure 2 4 Sample display readout in Bypass mode AVDC100 Audio Video Delay Corrector User Manual 2 9 Operating Basics Menu Commands Menu Navigation Mode Menu Status Menu The instrument provides five menus Mode Status Test Configuration and Boot to control its various settings and functions This section lists the contents of the menus and describes each of the available settings Refer to Menu Trees on page 2 26 to view menu trees for the five menus Press the associated menu button to display a menu Once you display a menu use the arrow buttons to navigate through the menu structure to a menu entry Typically the vertical arrow buttons will n
142. re upgrade NOTE You can perform the firmware upgrade on a remote AVDC100 after the firmware upgrade process is initiated from the instrument front panel When you perform a firmware upgrade the Readme txt file that is included with the firmware upgrade package will document whether all of the current Configuration menu and instrument mode settings are preserved Downloading the Before you download the AVDC100 firmware upgrade package verify that your Firmware Package PC meets the requirements listed below PC System Requirements The data transfer utility for upgrading the AVDC100 uses the WinSock 2 0 API which should be pre installed on the following PC systems m Windows 98 m Windows NT 4 0 m Windows 2000 m Windows ME systems AVDC100 Audio Video Delay Corrector User Manual C 5 Appendix C User Service Preparing the AVDC100 C 6 Users of Windows 95 may obtain an installation package for WinSock 2 0 from Microsoft The last known URL for this package is http www microsoft com windows95 downloads contents wuadmin tools s_wunetworkingtools w95sockets2 default asp Additionally your PC requires the following minimum system requirements to load and operate the data transfer utility used to upgrade the AVDC100 m Ethernet interface m 5 MB of free disk space Firmware Package Download You can download the latest version of the AVDC100 firmware from the Tektronix website at the following URL http ww
143. rect B 14 T Technical support contact information ix Tektronix contacting 1x Test button 2 3 Test menu 2 13 2 26 Time code display 2 11 Tracing TCP IP packets B 17 Trap address 2 19 Trap definitions B 11 Traps Glossary 1 Troubleshooting AVDC100 C 4 Common procedures B 16 Information sources B 19 Network management stations B 19 networking B 12 Pinging a host machine B 16 Tracing TCP IP packets B 17 TV line number 2 12 TVF16 dual rackmount kit viii U URL Tektronix ix User service General care C 1 Preventive maintenance C 2 Index 3 Index V Watermark configuration 2 16 Watermark gain meter 2 8 2 12 Versions 2 25 Watermark signal intensity 2 16 Vertical television line number 2 12 Web site address Tektronix ix W Z Watermark Glossary 1 Zone plate signal generator 2 14 Insertion 3 5 Index 4 AVDC100 Audio Video Delay Corrector User Manual
144. ress the Select button to save the modified gateway AVDC100 Audio Video Delay Corrector User Manual Operating Basics 2 MAC Address Use this Boot menu selection to view the MAC address assigned to your instrument by Tektronix Each AVDC100 is assigned a unique MAC address that you cannot edit The MAC Media Access Control address is the world wide unique hardware number assigned to a machine 3 Versions Use this Boot menu selection to view the current version numbers of the firmware hardware and Boot ROM of your instrument You cannot edit the displayed version numbers 4 Update Firmware Use this Boot menu selection to upgrade the instrument firmware The instrument will automatically reboot when the firmware upgrade is complete Refer to Firmware Upgrades on page C 5 for instructions on how to perform an upgrade if the instrument firmware 5 Reboot Use this menu selection to exit the Boot menu and reboot the instrument AVDC100 Audio Video Delay Corrector User Manual 2 25 Operating Basics Menu Trees Figure 2 5 Figure 2 6 and Figure 2 7 illustrate the selections available in each of the menus MODE re Dem pas STATUS 1 AES Receiver 2 Time Code 3 SDI Receiver 4 SDI Deserializer 5 Watermark Signal 6 Audio a No Errors Receiver a Locked a Locked or Unlocked a H xx V xx G i 525 625 Display or one of the a XX XX XX xx hours Unlock
145. rosoft R gt Windows NI CTM gt lt C gt Copyright 1985 1996 Microsoft Corp C gt nslookup oxford4 Server dnsmaster tek com Address 128 181 5 11 Name oxford4 cse tek com Address 128 181 39 88 C2 gt Figure B 6 Command prompt with nslookup results AVDC100 Audio Video Delay Corrector User Manual Appendix B Remote Control Troubleshooting Network If the solutions listed below do not solve your network problems call your Management Stations network administrator Problem am not receiving traps from the AVDC100 that is supposed to be sending me traps Reason 1 The network management station is not connected to the network Solution If you can ping the local machine but cannot ping any other device on the network check the physical network connections to ensure that your network cable is not loose Check at both the network interface card in your device the LAN connector and the network connection Reason 2 The TCP IP parameters on the remote AVDC100 are incorrect Solution Ping the remote AVDC100 from the network management station using the procedure described in Pinging a host machine on page B 16 If you cannot successfully ping the AVDC100 follow the procedure in Configuring the AVDC100 for SNMP Operation on page B 2 to ensure that the network parameters on the remote AVDC100 are correct Reason 3 The TCP IP parameters on the network management station are incorrect Solution Follow the
146. s m Common Troubleshooting Procedures m Troubleshooting Network Management Stations m Sources of Information If you cannot resolve problems using the procedures described in this section see your network administrator Fulfill the following requirements before troubleshooting your host machines m Your third party network management software is loaded on a host machine that fulfills the minimum requirements required by the software m Your network is a TCP IP network or minimally UDP IP for SNMP environments m Additional applications loaded on your network management station are not using the ports assigned to the network management software AVDC100 Audio Video Delay Corrector User Manual Appendix B Remote Control IP Parameters The illustrations in this section depict how each IP parameter IP address subnet mask and default gateway can negatively impact network connectivity Incorrect IP address If the IP address for your AVDC100 is incorrect not unique then you may or may not be able to communicate over the network In Figure B 1 TVTest_1 uses the same IP address as Rennes If Rennes is started first TVTest_1 will recognize the IP address conflict and will not load TCP IP consequently the AVDC100 named TVTest_1 will not be reachable over the network If your IP address is incorrect and the IP address does not exist on your subnet you may be able to communicate from the AVDC100 but you may not be able to c
147. signal intensity to level 1 Use the Configuration menu 1 ENCODER d Set WM Intensity setting Press the CONFIG button to close the menu display 3 On the the REF AVDC100 check the display for WM W1 and ACTIVE 4 On the REF AVDC100 note the source ID display 5 On the DUT AVDC100 change to Decode mode Press the MODE button to close the menu display 6 After 20 seconds on the DUT AVDC100 check that the Status LEDs are all green except that the A V Delay LED may occasionally go yellow 7 On the DUT AVDC100 check that the display reads AV 0 Flds F 0 with the watermark gain meter W at full amplitude and 0 errors 8 On the DUT AVDC100 check that the source ID display reads the same as the REF AVDC100 source ID noted in step 4 NOTE You will need to allow time for the ID display on the DUT AVDC100 to fill in Refer to Source ID on page 2 8 for more information about how the AVDC100 updates the source ID display You may notice occasional loCor or other messages when the A V Delay LED turns yellow indicating errors Occasional errors are normal Continuous errors are not normal If you see similar error messages continuously check the settings on the digital audio generator for a burst signal output with a 1000 Hz 500 ms burst signal and a 1 15 second period AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Encoder Operation Test 1 In the test e
148. ss any soft button to open the menu Set the following parameters in the Input submenu m CH 1 2 input BNC unbalanced m CH 3 4 input BNC unbalanced Press the Clear Menu button to clear the menu display Select the following front panel control settings m View Audio m Meter Scale Normal m Phase Display A AVDC100 Audio Video Delay Corrector User Manual D 17 Appendix D Functional Verification 5 On the WFM601M digital video monitor set the controls as follows a Set the input channel to be Serial A b Set the display mode to Eye c Set the sweep rate to Line 6 On the DUT AVDC100 set the controls as follows a Set the instrument to Bypass mode using the Mode button b Press the CONFIG button to open the Configuration menu c Use the arrow buttons to select 2 DECODER c Default Audio Delay and then press the Select button d Use the arrow buttons to set the default audio delay to 0 Fields and then press the Select button e Use the arrow buttons to select 2 DECODER a Delay Correction and then press the Select button f Use the arrow buttons to select Manual delay correction and then press the Select button g Use the arrow buttons to select 2 DECODER d Manual Delay and then press the Select button h Use the arrow buttons to set the manual delay to 0 Fields and then press the Select button i Press the STATUS button to open the Status menu j Use the arrow buttons to select 6
149. ss mode To feed the video input through the instrument without adding or monitoring a watermark Encode mode To output the watermark encoded video that you want to later monitor for A V delay or source ID Decode mode To output feed through the video signal on the input Bypass mode To feed the video input through the instrument without adding or monitoring a watermark All modes If you enable the zone plate generator from the Test menu the video output signal will be replaced by the selected zone plate signal Refer to 2 Zone Plate on page 2 14 for more information Encode mode To provide audio input so that the AVDC100 can extract the audio envelope variation facsimile for use in the A V measurement watermark Decode mode To provide audio input so that the AVDC100 can measure and or correct A V delay Bypass mode To feed the audio input through the instrument Encode mode To feed the audio input through the instrument Decode mode To provide A V delay corrected audio Bypass mode To feed the audio input through the instrument All modes To provide LTC Time Code input to be used for time stamping of status information retrieved via remote control All modes To provide a 10Base T LAN Ethernet interface for SNMP control of instrument settings signal monitoring A V delay correction and firmware upgrades from a remote PC Refer to Appendix B Remote Control for more information about using the AVDC100 via remote
150. ssion standard land declaration of AS NZS 2064 Industrial Scientific and Medical Equipment conformity FCC Compliance Emissions comply with FCC Code of Federal Regulations 47 Part 15 Subpart B Class A Limits To ensure compliance with the above requirements only high quality shielded interface cable should be attached to this instrument High quality cables have a reliable continuous outer shield braid and foil that has low impedance connec tions to shielded connector housings at both ends 2 Peak Inrush Current 8 9 A 264 VAC 50 Hz A 8 AVDC100 Audio Video Delay Corrector User Manual Appendix A Specifications Table A 11 Safety certification and compliance Category Safety Certification Compliance Equipment Type Safety Class Installation Overvoltage Category Pollution Degree Pollution Degree Definition European Union Compliance Listing by a U S Nationally Recognized Testing Laboratory Canadian Certification Additional Compliance Standards or description Test and measuring Class 1 as defined in IEC 61010 1 Annex H grounded product Overvoltage Category II as defined in IEC 61010 1 Annex J Pollution Degree 2 as defined in IEC 61010 1 Note Rated for indoor use only A measure of the contaminates that could occur in the environment around and within a product Typically the internal environment inside a product is considered to be the same as the external environment Pro
151. strument rackmount assembly to the desired position in the equipment rack Attach the front and rear brackets to the equipment rack using two screws 4 for each of the four brackets total of eight screws NOTE This kit provides eight clip on nuts 6 for use on equipment racks that do not have threaded mounting rails Figure 1 3 shows how to attach the nuts to the mounting rails of the equipment rack 5 Tighten the bracket screws that you left loose in step 3 on both sides of the instrument and rackmount hardware assembly You are now ready to connect power and signal cables to the instrument AVDC100 Audio Video Delay Corrector User Manual Installation Power and Signal Connections Connecting Power Connecting Signals After you have installed the instrument for stand alone or rackmount use you are ready to connect the power and signal cables to the instrument Figure 1 4 shows the instrument rear panel To supply power to the AVDC100 connect the power cord to the power input connector on the rear panel of the instrument and then connect the power cord to the local mains supply You can operate the AVDC100 using a grounded mains supply with a line voltage range of 100 VAC to 240 VAC and a frequency range of 50 Hz to 60 Hz The AVDC100 is grounded through the power cord The line fuse is internal and is not user replaceable Refer to Table 1 1 on page 1 5 for a listing of the optional power cords you may req
152. sync problems are caused in the studio from video processing Satellite links frame synchronizers and digital video effect machines DVEs usually add a predictable delay which can be compensated by adding fixed delays at certain points in the signal path However delay latency in the digital video signal path is increasing With the advent of MPEG program distribution the video signal can be subjected to multiple encoding and decoding compression processes with any delay errors being cumulative More variable delay can be added from complex video and audio special effects The resulting combined signal delays can be noticeably variable and large enough to generate viewer complaints The standard method of manually adjusting audio delay to synchronize the audio and video signal no longer works well with digital video signals to maintain audio and video synchronization The AVDC100 solves this problem by providing automatic real time and in service audio delay correction Human Visualand Humans are conditioned to expect to see something happen before hearing it Auditory Perceptions This is due to the natural difference in the speed of sound slow and the speed of light fast One common example of this natural experience is seeing a baseball player bat a ball before hearing the crack of the bat A V delay that is due to video processing results in the viewer experiencing the unnatural circumstance of hearing the sound of an event before s
153. teway address is the network address of a network router which can route data packets to other local networks The gateway address is checked by the instrument against the IP address and subnet mask addresses If the network portion of the gateway address as determined by the subnet mask does not match the network portion of the IP address the instrument will not accept the gateway address Use the arrow buttons to highlight and then change each number in the gateway to a number ranging from 0 to 9 Press the Select button to save the modified gateway address IP Address ofthe The AVDC100 must know the valid IP address of the network manager that will Network Manager be receiving SNMP trap messages generated by the instrument Enter the IP address of the network manager using the 3 Remote Control d Trap Address selection in the Configuration menu Use the arrow buttons to highlight and then change each individual number in the address Press the Select button to save the valid IP address You can assign each of the address digits a number ranging from 0 to 9 AVDC100 Audio Video Delay Corrector User Manual B 3 Appendix B Remote Control SNMP Access The SNMP access permissions granted by the AVDC100 to the network manager Permissions are configured using the 3 Remote Control a SNMP Access selection in the Configuration menu You can configure the SNMP access to be one of the following permissions Read Only Use this selection
154. the menu selections Reference This section describes the audio to video delay problem affecting digital video transmission and how the instrument uses digital watermarking technology to measure and correct audio to video delay Illustrations are provided of various video transmission systems showing where the instrument should be installed in the system to correct A V delay Appendices This section contains the product specifications instructions for configuring the instrument for SNMP operation on a LAN Ethernet network instructions for user servicing of the instrument including firmware upgrades and procedures to verify the functionality of the instrument Glossary This section contains definitions for various terms used in the manual Index This section contains the index for the manual AVDC100 Audio Video Delay Corrector User Manual vii Preface Related Documents The following related documents are available for the AVDC100 Audio Video Delay Corrector m The AVDC100 Audio Video Delay Corrector Reference Card Tektronix part number 071 0874 XX is a standard accessory provided with each instru ment The reference card serves as a quick reference aid for navigating the menu system and for understanding the front panel display codes and status LEDs m The TVF16 Dual Rackmount Adapter Installation Instructions Tektronix part number 075 0646 XX is provided with the TVF16 Dual Rackmount Adapter kit The TVF16 adapter k
155. tion of the instrument display module and LEDs Table 2 5 lists each of the available tests Table 2 5 Test menu Initiate Test selections Message a LEDs Normal LEDs All Green LEDs All Yellow LEDs all Red b Display Pixels Description Use the arrow buttons to toggle the front panel LEDs through the different color selections LEDs that do not light or do not display the correct color are defective Illuminates all of the pixels in the display module Pixels that do not illuminate indicate a defective display module Press the Select button to return to the Test menu display 4 Firmware Upgrade Use this Test menu selection to open the Boot menu where you can reboot the instrument or upgrade the instrument firmware Refer to Boot Menu on page 2 23 for more information Refer to Firmware Upgrades on page C 5 for complete instructions on how to upgrade the instrument firmware AVDC100 Audio Video Delay Corrector User Manual 2 15 Operating Basics Configuration Menu Press the Config button to access the Configuration menu The Configuration menu allows you to set various measurement and network parameters NOTE For menu selections with more than one setting the asterisk character appears on the display by the current menu setting The Configuration menu provides the following menu selections 1 Encoder Use this Configuration menu selection to change the Encoder settings listed in Table 2 6 Ref
156. to configure the SNMP agent to only allow the network manager to receive instrument parameters get operations Read and Write Use this selection to configure the SNMP agent to allow the network manager to both receive and change the instrument parameters get and set operations Community String for The AVDC100 authenticates all the queries from a network manager Each query Query Authentication from the network manager is accompanied by a context for authentication of the query The context is currently described by clear text and is called a community string or security name By default TEKTRONIX is configured to be the community string value when the AVDC100 is shipped from the factory The 3 Remote Control c Modify Community String selection in the Configuration menu allows you to modify the community string value Use the Arrow buttons to highlight and then change each individual character in the community string Press the Select button to save the modified community string You can assign each of the 15 community string characters to be one of the following characters A Z 0 9 lt sp gt _ NOTE To facilitate the authentication of valid queries from the network manager both the AVDC100 and the network manager must be configured with the same community string value Configuring the Network Manager To enable your third party network management software to communicate with the AVDC100 you must configure th
157. tor change the display mode to JITTER Record the Jitter P P value value 1 On the DUT AVDC100 change the operating mode to ENCODE On the digital video monitor record the Jitter P P value value 2 Check that value 2 minus value 1 is less than 0 15 UI On the digital video monitor change the display mode to EYE leave the DUT AVDC100 in Encode mode On the digital video monitor check that the EYE amplitude is between 725 mV and 850 mV AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Encode Mode Video Signal Integrity Watermark Signal Amplitude and 525 Line 625 Line Video Recognition Tests 1 10 11 12 On the DUT AVDC100 change the following settings Turn on the source ID output Use the Configuration menu 1 ENCODER a Source ID setting m Set the watermark signal intensity level to 3 Use the Configuration menu 1 ENCODER d Set WM Intensity setting On the digital video monitor change the following settings m Select Waveform display mode m Enter the Line Select mode and then select Line 24 m Select X10 Gain On the digital video monitor adjust the vertical position control to display the Shallow Ramp signal On the digital video monitor you should see a watermark signal noise amplitude of not more than three minor divisions at X10 gain on Line 24 as measured by the graticule The signal should be clean and free of glitches On th
158. tor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Observe All Terminal Ratings To avoid fire or shock hazard observe all ratings and markings on the product Consult the product manual for further ratings information before making connections to the product Do not apply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Do Not Operate Without Covers Do not operate this product with covers or panels removed Use Proper Fuse Use only the fuse type and rating specified for this product Avoid Exposed Circuitry Do not touch exposed connections and components when power is present Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry Provide Proper Ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation AVDC100 Audio Video Delay Corrector User Manual v General Safety Summary vi Symbols and Terms A A Terms in this Manual These terms may appear in this manual WARNING Warning statements identify conditions
159. tput On the DUT AVDC100 verify the instrument is detecting 625 line video Use the Status menu 5 WATERMARK SIGNAL setting On the digital video generator change the signal format to 525 line but still use Shallow Ramp signal On the DUT AVDC100 check that the 625 display has changed to 525 On the digital video generator return the signal format to 625 line but still use Shallow Ramp signal On the DUT AVDC100 check that the 525 display has returned to 625 Decode Mode Video Signal Integrity Test 1 On the DUT AVDC100 use the Mode arrow and Select buttons to repeatedly switch between the Decode and Bypass operating modes On the digital video monitor check that there are no changes in the display Waveform display mode On the digital video monitor change the following settings m Select the Eye display mode m Exit the Line Select mode m Select X1 Gain On the digital video monitor adjust the vertical position control to display the Eye diagram waveform On the DUT AVDC100 use the Mode arrow and Select buttons to repeatedly switch between the Decode and Bypass operating modes On the digital video monitor check that there are no changes in the display Eye display mode AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Encode and Decode Modes AES I O Tests 1 On the DUT AVDC100 change to Bypass mode 2 On the DUT AVDC100 display the audio acti
160. tute test equipment must meet or exceed the requirements Table D 1 Required equipment list for performance verification A V delay corrector Known to be operating properly Tektronix AVDC100 A V Delay Basic One required for the basic test Corrector Enhanced two required for the enhanced test Serial digital video signal Generate serial digital video test signals Tektronix TSG601 Serial All generator 525 line and 625 line Component Generator Serial digital video signal Monitor serial digital video test signals Tektronix WFM601M Serial All monitor 525 line and 625 line Digital Component Waveform Monitor Digital audio signal generator Generate digital audio test signals Tektronix AM70 Digital Audio All AES coaxial output or adapter Generator Digital audio signal monitor Monitor digital audio test signals Tektronix 764 Digital Audio All Monitor SMPTE LTC time code XLR input to AVDC100 Horita TG 50 LTC Time Code Electrical generator or SMPTE Generator time code per IEC461 from Requires RCA to XLR adapter plant distribution cable described below Time code cable XLR male signal connection to AVDC100 RCA to XLR adapter cable Electrical One required connections shown below RCA XLR male Cable male Tip Core Pin 3 Sleeve Shield Pins 1 2 SDI cable clone Passive delay equivalent to 0 300 meters of Faraday SC75A800B G or Electrical Belden 8281 cable delay resolution of 25 meters equivalent 75 Q coaxial cabl
161. twork manager when certain significant events have taken place within the instrument Each of the notification messages include the LTC time code indicating when the message was generated Table B 2 lists the triggering events that will result in each trap being sent to the network manager Table B 2 SNMP trap descriptions Trap Triggering event s Notification message VideoStatus Video present video present at lt xx xx xx xx gt or No LTC Timecode Video not present video not present at lt xx xx xx xx gt or No LTC Timecode LossConfidenceFlag Loss of confidence flag loss of confidence flag at lt xx xx xx xx gt or No LTC Timecode Return of confidence flag confidence flag OK at lt xx xx xx xx gt or No LTC Timecode TimeCode LTC present LTC present at lt xx xx xx xx gt or No LTC Timecode LTC not present LTC not present at lt xx xx xx xx gt or No LTC Timecode SdiDeserializerLocked SDI deserializer locked sdi deserializer locked at lt xx xx xx xx gt or No LTC Timecode SDI deserializer unlocked sdi deserializer unlocked at lt xx xx xx xx gt or No LTC Timecode SdiDeserializerNoVideo No video at the SDI deserializer sdi deserializer no video at lt xx xx xx xx gt or No LTC Timecode Video present at the SDI deserializer sdi deserializer video present at lt xx xx xx xx gt or No LTC Timecode SdiDeserializerTrs SDI deserializer TRS present sdi deserializer TRS present at lt xx xx xx xx gt or No LTC Timecode SDI deserializer TR
162. ues for troubleshooting network problems with the instrument SNMP Agent Description The AVDC100 provides a built in SNMP agent to facilitate remote operation of the instrument using the LAN Ethernet port The function of the SNMP agent is to receive queries from a network manager operating remotely If the query is valid the instrument responds by returning a value for the parameter specified in the query The SNMP agent also allows you to modify the operation of the instrument by accepting new values for specified parameters You can use any third party SNMP management software to manage the SNMP agent in the AVDC100 However the network manager must be configured to recognize the various AVDC100 parameters by using the MIB Management Information Base supplied with the instrument The AVDC100 MIB contains all of the instrument parameters that you can control using a network manager The AVDC100 constantly monitors the video and audio inputs for certain predefined abnormal events When one of these events occurs the instrument uses traps to promptly report the event to the network manager The instrument also reports when the abnormality is corrected The report is a simple text message describing the event and the LTC time code indicating when the event occurred You can log these events to a database or to a text file for later review of instrument performance over an extended period of time AVDC100 Audio Video Delay Corrector User Manu
163. uire to connect the AVDC100 to your local mains supply Refer to Rear Panel Connections on page 2 30 for a description of each rear panel connector the required format of the signal inputs and outputs and the various functions the connectors perform for each operating mode Encode Decode and Bypass Figure 2 9 on page 2 32 shows the typical signal connections to the AVDC100 for each of the instrument operating modes N 100 240V 10 50 60Hz 60W MAX MEASURING AND TESTING EQUIPMENT LTC TIME CODE RS232 DCE rr eoooo MI Nes e000 _ JEO 10 BASE T SERIAL VIDEO me DIGITAL AUDIO Figure 1 4 AVDC100 rear panel connectors AVDC100 Audio Video Delay Corrector User Manual 1 11 Installation 1 12 AVDC100 Audio Video Delay Corrector User Manual Configuration After you have installed the instrument and connected the power and signal cables you are ready to configure the instrument for operational use Initial configuration includes the following Setting the operating mode Configuring the watermark encoder Configuring the watermark decoder Setting the network Ethernet communication parameters Refer to Configuring the Instrument to Correct A V Delay on page 3 12 for more information Setting the Operating Mode The AVDC100 provides three operating modes depending on the desired use of the instrument Use the Mode button to set the AVDC
164. ument functions m Watermark encoder m Watermark decoder m Correctness of the embedded audio delay NOTE These basic functional tests using one additional known good AVDC100 have no capability to verify the A V delay measurement function in either Manual or Automatic correction modes nor do they have any capability to verify the performance of the automatic delay correction function To test these additional functions you must perform the procedures listed in Enhanced Functional Tests starting on page D 23 To perform the enhanced functional tests you must use two known good AVDC100 instruments Refer to Test Usage and Conventions on page D 2 for operator information before you perform these tests AVDC100 Audio Video Delay Corrector User Manual Appendix D Functional Verification Initial Equipment Setup Perform the following steps to set up the test equipment 1 Connect the test equipment as shown in Figure D 2 CAUTION To prevent you from incorrectly performing this procedure be sure to clearly mark which AVDC100 instrument is the DUT device under test This procedure uses multiple AVDC100 instruments If you do not use any identifying marks you may misidentify the DUT and the known good instrument during the procedure This procedure refers to the AVDC100 being tested as the DUT AVDC100 and refers to known good instrument as REF AVDC100 TSG601 Digital Video Generator SDI out SDI
165. various functions of the connectors for each of the three operating modes Encode Decode and Bypass Refer to Figure 2 9 on page 2 32 for an illustration of the typical signal connections to the AVDC100 for each of the instrument operating modes NOTE The video and audio signal inputs to the AVDC100 are relay bypassed to their respective output connectors in the event of a power failure CAUTION To prevent A V delay measurement and correction errors take the following precautions When the instrument is set to the Decode operating mode be sure to terminate the video signal output from the instrument The termination can be located at the output of the instrument or downstream in the video signal path When the instrument is being used as an audio delay unit be sure to connect a valid SDI video signal to the instrument A valid SDI video signal is required for the instrument to properly set the measurement mode to 525 line or 625 line The 525 625 line measurement mode must be set correctly because the AVDC100 measures and corrects audio delay in amounts of video fields not milliseconds Setting the correct measurement mode automatically sets the correct field timing 16 667 ms per field in 525 line mode or 20 0 ms per field in 625 line mode N 100 240V 10 50 60Hz 60W MAX MEASURING AND TESTING EQUIPMENT LTC TIME CODE RS232 DCE o0o000 Te ei re CL 1 J
166. vel of the watermark signal In the Configuration menu you can set the watermark signal intensity level to 1 2 or 3 with 1 being the lowest level and 3 being the highest The ability of the watermark signal to survive video processing and its potential for visual detection increase as the watermark intensity level increases Watermark Encoding Status The readout displays either ACTIVE or PASSIVE The word ACTIVE is displayed when the watermark encoder is actively inserting a watermark onto the video signal PASSIVE is displayed and the instrument stops inserting the watermark signal when it detects a previously existing watermark or when it cannot detect a video input signal NOTE The AVDC100 encodes one watermark onto the video signal Some portions of the watermark pattern are used to encode the source ID information and other portions are used to encode the A V delay measurement information When you turn off the source ID or you remove the audio input used to encode the A V delay information the AVDC100 will still encode a watermark pattern but the watermark will not include the respective data of the source ID and or the A V delay measurement information Source ID The readout displays the source ID you entered in the Encoder settings of the Configuration menu AVDC100 Audio Video Delay Corrector User Manual Operating Basics Decode Mode Readouts When the instrument is set to the Decode operating mode the readout disp
167. vides four status LEDs Video Audio Data and A V Delay to indicate the current status of various parameters being monitored by the instrument Each of the LEDs can assume four different states to indicate different monitoring conditions Off Green Yellow and Red Table 2 12 lists the different monitoring conditions that are indicated by the status LEDs Table 2 12 Decoding the status LEDs LED Video Off Green Yellow Red Audio Off Green Yellow Red Data Green Yellow Red AN Green Delay Yellow Red No video signal Video SDI locked Video SDI unlocked not used No AES signal Audio OK Low audio envelope Low audio or no audio No video signal Video SDI locked Video SDI unlocked not used No AES signal Audio OK Low audio envelope Low audio or no audio Data OK WM sync adjustment No WM sync detected AN value updated AN value not updated Persistent A V problem Bypass mode No video signal Video SDI locked Video SDI unlocked not used No AES signal Audio OK Low audio envelope Low audio or no audio off off off off off off 1 The Data and A V Delay status LEDs are not used in the Encode or Bypass operating modes and are forced off AVDC100 Audio Video Delay Corrector User Manual 2 29 Operating Basics Rear Panel Connections Table 2 13 describes the functional requirements for each of the rear panel connectors see Figure 2 8 Included are the
168. vity meter Use the Status menu 6 AUDIO DISPLAY setting 3 On the digital audio monitor change the controls as listed below m Select the Channel Status view m Configure the Channel Status view to show the decoded text from the DUT AVDC100 output 4 Onthe DUT AVDC100 use the Mode arrow and Select buttons to repeatedly switch between the Encode and Decode operating modes 5 On the DUT AVDC100 as you repeatedly switch between the Encode and Decode operating modes check for the following conditions On the digital audio monitor check that there are no changes in the Channel Status decoded text display m On the DUT AVDC100 the audio activity meter indicates active audio in both of the Encode and Decode operating modes m On the DUT AVDC100 the VIDEO and AUDIO status LEDs are green 6 On the digital audio monitor select the Audio display mode 7 On the DUT AVDC100 change to Bypass mode 8 On the digital audio monitor check for the following conditions m All four bars are moving together and peaking at identical amplitudes m The Lissajous display is a vertical line 9 On the DUT AVDC100 change to Encode mode 10 On the digital audio monitor check that the display does not change 11 On the DUT AVDC100 change to Decode mode 12 On the digital audio monitor check for the following conditions m All four bars are moving together and peaking at identical amplitudes m The Lissajous display is elliptical or circula
169. w tek com Measurement video audio From there follow the links to Software amp Drivers and then to Video Test to locate the AVDC100 firmware upgrade package When you download the upgrade package you will receive a self extracting ZIP file containing the following files m transfer exe data transfer utility program m firmware pkg AVDC100 firmware upgrade data file m readme txt release notes There are two methods for preparing the AVDC100 for firmware upgrade depending on whether or not the AVDC100 is installed on a LAN Ethernet network Network Installation Perform the following procedure to prepare the AVDC100 for a firmware upgrade when the instrument is installed on a network 1 Connect the AVDC100 to your LAN Ethernet network using a standard Ethernet cable 2 Access the Boot menu on the AVDC100 using one of the following methods m Hold down one of the front panel menu buttons when you apply power to the instrument m Select 4 FIRMWARE UPGRADE from the Test menu AVDC100 Audio Video Delay Corrector User Manual Appendix C User Service 3 Use the 1 NETWORK selection in the Boot menu to verify that the network settings on the AVDC100 are configured properly for your network NOTE If you upgrading the AVDC100 on the same network you use for the normal operation of the instrument you should not have to modify the network settings already configured in the AVDC100 If you are upgrading the AVDC
170. wer on Problems Network Problems Status LED or Display Problems This section provides techniques to use when you suspect there are problems with the AVDC100 This section does not identify specific problems related to functional verification or adjustments The diagnostic techniques provided in this section can help you determine that a problem exists with the instrument but will not isolate any problems to a specific module in the instrument If you discover problems exist with your instrument contact your local Tektronix service center for assistance Power on diagnostics run when you first power on the instrument These diagnostics check various portions of the hardware and firmware for correct operation If error messages occur during the power on diagnostics there may be an instrument failure that prevents the instrument from operating properly Table C 1 lists some of the symptoms of instrument problems that you may encounter during power on and lists various possible solutions Table C 1 Troubleshooting power on failures Symptom Possible causes and recommended actions Instrument does not power on Verify that the power cord is connected to the instrument and to the power source Check that power is available at the power source Contact your local Tektronix service center Power on diagnostics fail Contact your local Tektronix service center If you suspect networking problems refer to Network Troubleshooting on
171. when a loss of watermark signal is detected Decay to Default This setting configures the instrument to slowly adjust the A V delay correction value back to the default audio delay value set by the Default Audio Delay menu selection described above when it detects a loss of the watermark signal AVDC100 Audio Video Delay Corrector User Manual Operating Basics 3 Remote Control Use this Configuration menu selection to change the remote control settings listed in Table 2 8 These settings configure how the instrument responds to messages from Network Management Stations over your LAN Ethernet network Refer to Appendix B Remote Control for information about how to use the AVDC100 over a LAN Ethernet network Table 2 8 Remote Control configuration settings Menu selection Description a SNMP Access Use this setting to configure whether or not the instrument settings can be changed from a remote location Read Only This setting allows the instrument settings and status to be viewed from a remote location using the get command but no changes can be made Read Write This setting allows the instrument settings and status to be viewed and changed from a remote location using both the get and set commands b Community String Use this setting to view the community string By default the instrument is configured with a community string value of TEKTRONIX that you can change using the Modify Community String menu se
172. will be used by the instrument These parameters include the watermark signal intensity the method of A V delay correction the source ID and network communication Refer to Configuration Menu on page 2 16 for a description of the parameters you set using this menu Arrow and Select Buttons The arrow shaped buttons and the Select button work together to allow you to navigate through the various menu structures Press the arrow shaped buttons to navigate through the menu structure and then use the center Select button to make menu selections AVDC100 Audio Video Delay Corrector User Manual 2 3 Operating Basics Display Readouts Encode Mode Readouts 2 4 The AVDC100 uses a two line 20 characters per line vacuum fluorescent display module to show instrument status for the current operating mode of the instrument Encode Decode or Bypass when there is no active menu This section describes the status and message readouts for each operating mode When the instrument is set to the Encode operating mode the readout displays the status of the watermark encoder Figure 2 2 shows a sample display readout when the instrument is set to the Encode operating mode ACTIVE ID TEKSTUDIO Figure 2 2 Sample display readout in Encode mode When the instrument is set to Encode mode the following watermark encoder status information is displayed Watermark Intensity Level The readout displays WM Wn where n is the intensity le
173. y apply an audio delay of up to 150 video fields m Manual In manual mode the instrument measures the A V delay value and the user manually corrects audio delay either by using the instrument front panel controls or by using remote control commands over a 10Base T LAN Ethernet network AVDC100 Audio Video Delay Corrector User Manual Product Description Key Features Each instrument provides the following key features m Measures and or corrects audio to video delay errors in a digital video distribution chain by decoding a watermark previously encoded by another AVDC100 upstream in the signal path NOTE The AVDC100 can measure A V delay when the video signal is advanced or delayed relative to the audio signal but can only correct A V delay when the video is delayed relative to the audio Advanced audio is the normal condition because video processing usually causes latency only in the video signal The instrument encodes one watermark pattern onto the video signal that contains data for both the A V delay measurement and for the source ID code When you turn off the source ID or when you remove the audio input used to encode the A V delay measurement data the instrument will still encode a watermark pattern but the watermark will not include the respective data of the source ID and or the A V delay measurement m Inserts or decodes program Source ID for play out verification m Provides A V delay error measurements
174. yed and held at the manual delay value b Correction Range Use this setting to configure the A V delay correction range when the instrument is set to the automatic delay correction mode You can set the correction range to 0 30 video fields The AVDC100 uses this setting plus the Default Audio Delay setting to determine the overall correction range For example if you set the Default Audio Delay to 60 fields and the Correction Range is set to 10 fields then the overall range of audio delay correction would be from 50 to 70 fields You can tighten or loosen the audio delay correction range with the Correction Range setting and you can move the center of the correction range using the Default Audio Delay setting NOTE Setting the correction range to a lower number will decrease the chance that a noticeable change of audio delay will occur in the video program when the automatic delay correction algorithm encounters a problem AVDC100 Audio Video Delay Corrector User Manual 2 17 Operating Basics Table 2 7 Decoder configuration settings Cont Menu selection c Default Audio Delay d Manual Delay e On Loss of WM Description Use this setting to configure the instrument for a default audio delay The default audio delay is the expected A V delay in automatic delay correction mode The instrument will use this delay value if it cannot reliably measure the A V delay from the video input The default delay v

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