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User's Guide - Canford Audio
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1. Phase display Phase V The bar graph on the lower half of the display shows the phase shift between two selected inputs It works best for none periodic signals such as music or noise If the phase calculation detects a complete phase inversion the word inv is shown Release the buttons to return the display to the normal screen 2006 BEL Digital Audio Ltd 8 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Operation MetaData Display The BM A2 E8SHD is capable of displaying comprehensive Dolby E and D metadata information It is recommended that this section be read in conjunction with the Dolby Metadata guide issue 3 To enter the metadata display mode use the following sequence 1 Ensure that a valid Dolby encoded source is connected selected and decoding correctly 2 For Dolby E metadata select the program number required using the front panel rotary switch prior to entering the metadata display mode The unit will default to program 1 if the independent position is active 3 Press and hold the Dolby button for more than two seconds The BM A2 E8SHD will then enter the Dolby decode mode and will briefly show metadata display on the LCD The display will index to the next available metadata each time the Dolby button is pressed To exit the metadata display mode press any other button There are three routes through the metadata display depending on the source format 1 PCM The display will show PCM and the exi
2. 8 differential on 25 way D type connector 108 w r t clipping At max volume seiting 10dB At 0 5 volume setting 2dB 4 pairs unbalanced on BNC connectors 800B w r t maximum output 100dB SPL Magnetic 21 Version 1 0 BEL DIGITAL AUDIO NORDIC DIN PPM BBC PPM VU VU EXT AES EBU Housing Power Environmental Weight Computer interface O 2006 BEL Digital Audio Ltd BM A2 E8SHD Specification Overall dynamic range 54dB 12 to 42dB Attack time 5mSec Fallback 1 7Sec per 20dB decay Overall dynamic range 55dB 5 to 50dB Attack time 10mSec Fallback 1 5Sec per 20dB decay Overall dynamic range 12 to 12dB from mark 7 to mark 1 Attack time 10mSec Fallback 2 85Sec from mark 7 to mark 1 Overall dynamic range 23dB 3 to 20dB Attack time 300mSec Fallback 300mSec Overall dynamic range 80dB 20 to 60dB Attack time 300mSec Fallback 300mSec Overall dynamic range 60dB 0 to 60dB Attack time 1mSec Fallback 1 5Sec per 20dB decay 19 Rack Mount 2U high Outline Dimensions 483mm W x 256mm D 89mm H Outline Dimensions 19inch W x 10inch D x 3 5inch H 90 264 VAC 50 60Hz Autoselect Fuse 4A HAC Temperature 0 to 30 C Humidity 70 max non condens ing 6kg 14lbs 9 pin RS 232 female PC AT serial interface for Dolby card 22 Version 1 0
3. O ON A LH A 19 21 BEL DIGITAL AUDIO BM A2 E8SHD Introduction Introduction The A2 E8SHD is a 2U high quality eight channel audio monitor with an integral Dolby decoder The unit accepts audio from either one of two AES inputs or one of two SDI inputs and produces four pairs of AES and analogue outputs The SDI inputs automatically detect SD or HD video and demultiplex 8 audio channels Two active loop through outputs are available for the SDI inputs MONITOR DBE20 5 1 2 P2 24f ps th th th hatha t E Et es n E 0 9 4 otick on scale graticules which may be applied the spaces between the front panel bargraphs are supplied with the machine The LCD display shows the status of the selected audio or Dolby program and can also be used to display phase information I P source select Dolby E Ch pair Pgm Select N N Left trix atrix D lt Lim E Spkr ES Vol N Bal O Headphone SD 1 n 5 o O0 0 0 b CEN Right 0 AN Level spke J Line Out R x 1FIRICLFE 115 1RS 2L 2R Independent mix buttons B gt a Direct Group The headphone output is taken before the limiters and mutes the speakers when used A soft mute is applied to the audio when any select switches are used to reduce glitches 2006 BEL Digital Audio Ltd 1 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD In
4. DIGITAL AUDIO BM A2 E8SHD 8 Channel Digital Audio Monitor MONITORA DBE20 5 P2 24f ps DIRECT GROUP 8 T m s S ww 1 59 ts 1 3 BALANCE VOLUME a M d User s Guide Version 1 0 09 05 2008 BEL DIGITAL AUDIO BM A2 E8SHD BEL Digital Audio Ltd has made every effort to ensure the accuracy of information contained within this document which is nevertheless supplied for information purposes only and does not constitute any form of warranty or guarantee All trademarks acknowledged The information in this document is subject to change without notice Bel Digital Audio Ltd Unit 3 Horwood Court Bletchley Milton Keynes Bucks MK11RD Tel 01908 641063 Email info beldigital com Web www beldigital com 2006 BEL Digital Audio Ltd BEL DIGITAL AUDIO Contents INTRODUCTION Main features Typical LCD displays Bargraph scales OPERATION SELECTING SOURCES AES input mode SDI input mode Dolby mode USING THE PROGRAM SWITCH DIRECTING SOURCES TO SPEAKERS REAR PANEL AUDIO OUTPUTS UsiNG THE LCD PHASE DISPLAY METADATA DISPLAY INSTALLATION CONNECTOR RS232 Dolby interface connector pinout Analogue audio outputs CONFIGURATION Adjusting audio monitor output level Adjusting bargraph break points and ballistics Inserting bargraph graticules QUESTIONS AND ANSWERS APPENDIX SPECIFICATION 2006 BEL Digital Audio Ltd BM A2 E8SHD N
5. 2 2 2 2 4 2 P1 2 2 2 2 4 1 5 1 P1 2 2 2 P3 41 4 1 5 1 6 1 P1 2 2 1 P3 41 4 1 5 1 6 1 P7 1 P1 1 2 1 1 4 1 5 1 6 1 7 1 8 1 1 5 1 P1 4 P2 42 P1 4 P2 1 P3 1 P1 2 2 2 P3 2 P1 2 2 2 P3 1 P4 1 P1 2 2 1 P3 1 4 1 P5 1 P1 1 2 1 1 4 1 5 1 P6 1 1 4 1 2 2 2 1 2 2 1 1 P1 1 2 1 1 4 1 Note The Program Switch selects sequence elements in the order they appear in the Dolby E bit stream For example for 5 1 1 1 P1 selects 5 1 P2 selects the first 1 additional channel and P3 selects the final 1 additional channel 2006 BEL Digital Audio Ltd 20 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Specification Specification Audio inputs Digital AES Sample rate Video Input Meters Bar Graphs Analogue monitor outputs Max output level Noise THD Frequency response All analogue outputs Selected Analogue outputs Noise thd Output level AES outputs Main drive amp Noise THD Speaker driver units Peak acoustic level 2ft Shielding Scales and Ballistics 2006 BEL Digital Audio Ltd 1 x 110Q differential XLR connector and 1 x 75Q BNC connector 48 kHz 2 x SD HD SMPTE 259M 296M 274M 292M 53 element tricolour with adjustable colour break points 15dB 98dB 20 Hz to 20kHz 1dB
6. AL AUDIO BM A2 E8SHD Installation Red zone Choosing how many segments are coloured red from the top of the bargraph sets the red zone Select from none to 31 using SW1 4 2 SW1 4 1 SW2 3 8 SW2 3 7 and SW2 3 6 as follows Segment from bargraph top SW1 4 2 SW1 4 1 SW2 3 8 SW2 3 7 SW2 3 6 OFF OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF ON OFF OFF OFF OFF ON ON OFF OFF ON OFF OFF OFF OFF ON OFF ON OFF OFF ON ON OFF OFF OFF ON ON ON OFF ON OFF OFF OFF OFF ON OFF OFF ON OFF ON OFF ON OFF OFF ON OFF ON ON OFF ON ON OFF OFF OFF ON ON OFF ON OFF ON ON ON OFF OFF ON ON ON ON ON OFF OFF OFF OFF ON OFF OFF OFF ON ON OFF OFF ON OFF ON OFF OFF ON ON ON OFF ON OFF OFF ON OFF ON OFF ON ON OFF ON ON OFF ON OFF ON ON ON ON ON OFF OFF OFF ON ON OFF OFF ON ON ON OFF ON OFF ON ON OFF ON ON ON ON ON OFF OFF ON ON ON OFF ON ON ON ON ON OFF ON ON ON ON ON Note Itis not possible to set 31 red and 31 amber segments since there are only 51 segments for level display purposes Amber zone Choosing how many segments are coloured amber from the end of red zone sets the amber zone Select from none to 31 using 5W2 3 5 SW2 3 4 SW2 3 83 SW2 3 2 and oW2 3 1 as follows 2006 BEL Digital Audio Ltd 15 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Installation Segment from last RED ZONE SW2 3 5 SW2 3 4 SW2 3 3 SW2 3 2 SWw2 3 1 OFF OFF OFF OFF OFF OFF OFF OFF OFF ON OFF OFF OFF ON OFF OFF OFF OFF
7. Dolby E program to be monitored Available mix downs are selected with the Program Switch as shown in the switch position table in Appendix A The selected signal is sent to the left and right speakers and the first two bargraphs left most looking at the front of the unit The following example may help to explain the facilities provided Consider the situation where a studio wants to convey a surround sound music signal together with two technical 2006 BEL Digital Audio Ltd 5 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Operation commentaries for transmitter operators For the surround sound a 5 1 configuration might be ideal since it has 5 audio channels and one LF effects channel as shown in Appendix A However the two independent engineering feeds two different languages and not for transmission can be encoded into two unused channels to give a configuration of 5 1 1 1 The Dolby mix down The operator at the transmitter might want to listen to the music but not necessarily in full surround sound Fortunately the Dolby decoder has an auxiliary output which carries a mix down This is a stereo signal that contains a mixture of in this case all 6 music signals with any phasing or special effect applied The Dolby decoder knows that the audio is encoded as 5 14141 In order to listen to the engineering feeds it must be possible to direct the decoder to select the 5 1 1 or 1 signals and output the appropriate mix down to the aux
8. L 1R 3C 4C None None 2L 2R 1L 1R 4C 5C None None 2C 3C 1C 2C 3C 4C 5C 6 1L 1R 1C 1S None None None None 1L 1R None None None None 2L 2R 1L 1R None None None None 2C 3C 1C 2C 3C 4C None None None None 1L 1R 1C 1LFE 1Ls 1Rs None None 1L 1R 1C None 1Ls 1Rs None None 1L 1R None 1LFE 1Ls 1Rs None None 1L 1R None None 1Ls 1Rs None None 1L 1R 1C 1LFE 1S None None None 1L 1R 1C None 1S None None None 1L 1R None 1LFE 1S None None None 1L 1R None None 1S None None None 1L 1R 1C 1LFE None None None None 1L 1R 1C None None None None None 1L 1R None None None None None None None None 1C None None None None None 1C 2C None None None None None None 1L 1R None None None None None None 19 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Appendix A The following table shows all the possible Dolby E Program Sequences and relates them to the number of available channels and programs The mix down within a sequence can be selected with the Program Switch in the positions shown The selected mix down is sent to the left and right speakers and the first two bargraphs left most looking at the front of the unit Dolby mode A A A CO CO CO A N I N C1 fF O N W N 1 5 1 2 2 P1 5 1 2 1 P3 1 P1 4 P2 44 P1 4 P2 42 2 P1 4 2 2 1 P4 1 P1 4 2 1 1 P441 5 1 P1
9. Not connected GND Not connected Not connected Not connected c N O O N Not connected Note A standard modem lead can be used to interface to a PC 2006 BEL Digital Audio Ltd 10 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Installation Analogue audio outputs Aout 1 Aout 1 GND Aout 2 Aout 2 GND Aout 34 Aout 3 GND Aout 4 Aout 4 GND GND GND Aout 54 Aout 5 GND Aout 64 Aout 6 GND Aout 7 Aout 7 GND Aout 84 Aout 8 Configuration Bargraph meters are supplied in two groups of four to monitor inputs 1 to 4 and inputs 5 to 8 These two groups of bargraphs may be configured independently to support different meter ballistics and scales peak hold decay and different transition points between coloured areas Different scales are supported with a range of stick on scale graticules and meter type settings are made inside the unit using DIL switches 2006 BEL Digital Audio Ltd 11 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Installation Access to BM A2 E8SHD internal adjustments is obtained with the top removed Note 8 channel output interface omitted for clarity Warning Configuration instructions are for trained personnel To avoid dangerous electric shock do not remove any covers or carry out adjustments unless qualified to do so BM A2 E8SHD internal adjustments The following adjustments may be made e Analogue line output SW 1 potentiometers main bo
10. ON ON OFF OFF ON OFF OFF OFF OFF ON OFF ON OFF OFF ON ON OFF OFF OFF ON ON ON OFF ON OFF OFF OFF OFF ON OFF OFF ON OFF ON OFF ON OFF OFF ON OFF ON ON OFF ON ON OFF OFF OFF ON ON OFF ON OFF ON ON ON OFF OFF ON ON ON ON ON OFF OFF OFF OFF ON OFF OFF OFF ON ON OFF OFF ON OFF ON OFF OFF ON ON ON OFF ON OFF OFF ON OFF ON OFF ON ON OFF ON ON OFF ON OFF ON ON ON ON ON OFF OFF OFF ON ON OFF OFF ON ON ON OFF ON OFF ON ON OFF ON ON ON ON ON OFF OFF ON ON ON OFF ON ON ON ON ON OFF ON ON ON ON ON Inserting bargraph graticules The following bargraph scale graticules are supplied with each unit 2006 BEL Digital Audio Ltd 16 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Installation A E 0 nm c 5 E E E 42 DIN Ext VU VU NORDIC BM A2 E8SHD scale graticules To apply a graticule proceed as follows e back the protective backing from the chosen graticule e apply the graticule to the space between a pair of bargraphs e repeat the process for the other bargraph graticule position e ensure that the bargraph setting matches the graticule e adjust the colour transitions and peak hold decay as desired 2006 BEL Digital Audio Ltd 17 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Questions and answers Questions and answers The unit seems dead what can I do Check the power cabling and the integral fuse in the IEC mains socket at the rear of the unit Check that the power switch at the r
11. The unit will decode Dolby D and Dolby E from the AES inputs or embedded audio carried in an SD or HD SDI signal Dolby E encoding allows several separate programs or groups of audio to be carried in the same data stream The program switch is provided to allow the individual programs to be selected and their channels directed to bargraphs See the section entitled Using the program switch for more information about the Dolby E monitoring features available Decoding AES inputs Rotate the Dolby program mix switch to the independent position The unit will automatically detect and decode the Dolby signals and show up to 8 audio signals on the bargraphs The type of Dolby encoding will be shown on the display Decoding SDI inputs Dolby E or Dolby D embedded in a pair of audio signals in an SDI stream can be decoded and up to eight audio signals can be shown on the bargraphs The type of Dolby encoding will be shown on the display Select the channel pair carrying the Dolby encoded signal using the Dolby group select rotary switch So for example if the Dolby signal was encoded in the second pair of audio signals in group 1 this corresponds to channels 3 4 and is selected by rotating the Dolby group select switch to position 2 Using the program switch Dolby E encoding allows several separate programs or groups of audio to be carried in the same data stream The program switch allows individual mix downs and channels within a
12. allistics 2006 BEL Digital Audio Ltd 13 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Installation The switch adjustments for each group of four bargraphs are as follows e Channels 1 to 4 use DIL switches SW 1 1 to 8 and SW2 1 to 8 e Channels 5 to 8 use DIL switches SWA 1 to 8 and SW3 1 to 8 8 90 6 21 SW 2 3 BM A2 E8SHD bargraph adjustments AES to analogue adjust SW 1 4 8 The 18dB and 20dB settings define the relationship between AES input level and the 0 mark on an analogue scale This allows analogue scales to be used with digital signals Note When digital inputs are used with an analogue scale line outputs are less than shown on the meters since digital to analogue converters clip at 15 dB The effective loss is 3dB when the 18 dB position is selected and 5dB when the 20 dB position is selected Peak hold decay SW1 4 7 SW1 4 6 Scale type SW1 4 5 SW1 4 4 SW1 4 3 OFF OFF OFF OFF OFF ON OFF ON OFF OFF ON ON ON OFF OFF ON OFF ON ON ON OFF ON ON ON Note The ON position is obtained with a switch lever DOWN in the drawing Each bargraph has 53 tri colour segments The top and bottom segments are reserved leaving 51 Up to 31 of the remaining top most segments may be coloured red Up to 31 of segments from the end of the red zone downward may be coloured amber The remaining segments if any are always green 2006 BEL Digital Audio Ltd 14 Version 1 0 BEL DIGIT
13. ard e Bargraph settings SW1 SW2 and SW4 3 on bargraph module e Auto sum LK6 Line Out Left LK9 Line Out Right e LCD contrast potentiometer below bargraph module on main board e LK1 and LK2 under bargraph module enable SDI loop out when jumper link is placed across pins Warning mproperly terminated or unterminated inputs or outputs will reduce usable cable length Do not enable loop through unless terminations are in place 2006 BEL Digital Audio Ltd 12 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Installation Adjusting audio monitor output level In the following tables ON is obtained with a switch lever in the DOWN position The adjustments are located on the main board under the output sub board Analogue monitor output adjustments OQB setting shown Left 0 dB 0 on analogue scale OdBu on output 2 Left 4 dB 0 on analogue scale 4dBu on output Left 8 dB 0 on analogue scale 8dBu on output Left Variable adjacent pot 0 to 12 dB Right 0 dB 0 on analogue scale OdBu on output Right 4 dB 0 on analogue scale 4dBu on output Right 8 dB 0 on analogue scale 8dBu on output Right Variable adjacent 0 to 12 dB Note It is intended that only one switch lever is set to ON for each monitor output The ON position is obtained with a switch lever in the direction of the arrow downward in the above drawing Clockwise rotation increases gain Adjusting bargraph break points and b
14. ear is in the on position Try using a different known power source Try switching the unit off at the rear for a few seconds and then restore power For some bargraph displays ballistics or colour transition points are wrong what can do Check that the appropriate meter type and colour transition points have been selected with the DIL switches inside the unit Check that the chosen ballistics setting and bargraph scale graticules match Why do one or more input source LEDs remain red For all inputs check that a valid input is present at the rear of the unit For SD HD inputs check that high quality cable is used and that 750 terminations are in place if loop through outputs are enabled LK1 or LK2 under bargraph module enabled loop through when placed across pins in this position the loop through output must be properly terminated For AES inputs check that the input sample rate is 48 kHz Why don t the mix assign buttons work in any Dolby E program mode When the Program Switch is in positions P1 to P8 the Dolby decoder is responsible for producing the required mix downs in a Dolby E Program Sequence The individual channels that go to make the sequence components are not available and the mix assign and speaker buttons are disabled What exactly does the Program Switch do The Program Switch works when the Dolby decoder is active and receiving a Dolby E bistream It allows a particular component in a Dolby E bitstream to be
15. enabled further Dolby information will be shown as illustrated above Phase display Phase V The bar graph shows the phase relationship of two selected inputs See the Operation chapter for more information Bargraph scales The following meter types may be selected using internal switches Range Attack Fallback AES EBU _ 60dB 0 to 60dB ms 1 5Sec per 20dB decay DIN PPM 55dB 5 to 50dB 10mSec 1 5Sec per 20dB decay VU 23dB 3 to 20dB 300mSec 300mSec VU EXT 80dB 20 to 60dB 300mSec 300mSec BBC PPM 12 to 12dB mark 7 to 1 10mSec 2 85Sec mark 7 to 1 NORDIC 54dB 12 to 42dB 5mSec 1 7Sec per 20dB decay BM A2 E8SHD meter types Note Refer to the Installation chapter for bargraph settings and graticule scale fitting instructions 2006 BEL Digital Audio Ltd 3 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Operation Operation Bargraphs 1 4 show Bargraphs 5 8 show audio in group selected audio in group selected by A Group Switch LCD Menus Status Input source select by B Group Switch A Group Switch Dolby Prgm Cntrl B Group Switch r AS MONITOR SOURCE BEL MONITOH A2EBSHD TE m SD HD DOLBTI DOLBY E a OLY tix r CHANNEL PAIR DRECT CHOUN pouty gt _ 7 pe A INDEPENDENT gt X Pas E 77 42 VOLUME Mix Buttons Ch 1 4 Spkr Select Mix Buttons Ch 5 8 Dolby Enable Dolby ch pair select The BM A2 E8SHD f
16. iliary output The three separately encoded audio programs can se selected using the Program Switch Clearly the mix down of the 1 signals will be a simple mono signal When the BM A2 E8SHD is in any of the P1 to P8 Program Select modes or Dolby Down Mix modes the stereo audio available on the auxiliary output is sent to the left and right speakers and to bar graphs 1 amp 2 Refer to appendix A for a list of the available Dolby programs and channels for specific Dolby E Program Sequences Note The speaker select mix facility is defeated in Program Select or Dolby Down Mix modes Independent mode All of the Dolby E audio signals can be decoded and made available on their own not mixed by setting the Program Switch to the Independent position In the 5 1 1 1 example music might be presented on bar graphs 1 to 6 and the two engineering feeds on bars 7 and 8 It is then easy to select which of these to listen to by pressing the button under the appropriate bar graph A mix down of some or all of the channels can be obtained by selecting several audio signals to be sent to each speaker Note Independent mix down does not apply all of the phasing effects of the Dolby mix down modes Directing sources to speakers Where more than two audio signals are present i e Dolby E independent mode or de embedded mode it may be useful to direct and combine sources to selected speakers To develop a mix down of chosen sources for left or
17. l audio outputs The BM A2 E8SHD provides digital and analogue audio outputs on the rear panel Eight differential analogue on a 25 way D type connector and four pairs of AES3 on BNC connectors are available The audio carried on these is derived from the currently selected eight audio sources In effect these audio outputs are a copy of the signals shown on the unit s bar graphs They can thus be a copy of the AES inputs the two currently demuxed SDI groups or the eight decoded Dolby signals The level of the analogue outputs is adjustable in one of two ways as dictated by link LK5 on the PCB In the position shown in the picture the analogue output level can be set using the control RV1 on the PCB this is factory set to be OdB for an analogue bar graph level of OdB With the link in the other position the level of the analogue outputs will follow the setting of the main volume control It is possible to mute the output from the unit s speakers by removing all the mix button selections Link in fixed level position RV1 used to set fixed level 2006 BEL Digital Audio Ltd 7 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Operation Using the LCD phase display To enter the phase display mode ensure both LS and RS LED are extinguished Then press and hold the button under the input signal required to be the phase reference Press and hold the input button to be the variable phase input The display will show the phase of the selected signals
18. mming some or all of the channels The eight audio channels selected are also output at the rear of the unit as four pairs of AES signals on BNC connectors and four pairs of differential analogue signals The analogue outputs can be at a fixed level or slaved to the front panel volume control Main features e Balanced XLR and unbalanced BNC digital audio AES inputs e Two auto sensing SD HD inputs with loop through e Dolby D or Dolby E decoder e Dolby mix down program select switch e Custom channel mix downs for de embedded multiple audio and Dolby E independent mode e Two groups of four tri colour bargraphs with different meter types ballistics colour transition points peak hold and brightness settings for each group e Analogue line output and 8 selected audio outputs e Six different meter types AES EBU Nordic DIN VU Extended VU and BBC e LCD status phase display e Headphone connector with speaker mute e HS232 port for Dolby decoder remote control 2006 BEL Digital Audio Ltd 2 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Introduction Typical LCD displays Dolby status Dolby mode amp bit depth Program information J DBE20 K N 78 selected Frame rate Video mode The LCD display will show general status information related to the currently selected input such as the source selected and line standard If a Dolby input is selected and the Dolby decoder is
19. right speakers proceed as follows e Left channel mix press the left speaker select button LS until the LED above the button shows red Then press the button under the bar graph corresponding to the input audio signal required The buttons toggle and if more than one button is 2006 BEL Digital Audio Ltd 6 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Operation pressed the audio signals will be summed The left speaker audio output level is automatically adjusted to compensate for the mixing process The selected audio is indicated by the LED above the corresponding bar graph turning red e Right channel mix press the right speaker select button RS until the LED above the button shows green Then press the button under the bar graph corresponding to the input audio signal required The buttons toggle and if more than one button is pressed the audio signals will be summed The right speaker audio output level is automatically adjusted to compensate for the mixing process The selected audio is indicated by the LED above the corresponding bar graph turning green e f an input is directed to both left and right speakers the indicating LED is illuminated in amber Note that the setting of the mix buttons is retained over power down There are two sets of memories one for the Dolby mode and one for the independent mode The appropriate set is automatically selected depending on the current mode Changed using the Dolby button Rear pane
20. ront panel Selecting sources The input source select switch determines which source AES1 AES2 SDI 1 or SDI 2 is available to the Dolby decoder speaker selectors and bargraphs Repeatedly press the source select button until the required LED is illuminated Two source settings are retained over power down one for Dolby mode and one for direct mode Source LEDs are lit red until a valid source is connected when the corresponding LED will turn green AES input mode In the AES input mode the mix buttons are inoperative and the left speaker is selected as left input and right speaker the right input The input level is shown on the left two bargraphs Note AES inputs can be at 48kHz or 44 1kHz sampling rate SDI input mode The unit automatically detects SD or HD video and shows the video mode on the LCD 525 625 720 or 1080 Two groups will be demuxed to give 8 audio signals The groups are selected using the A and B group select switches Note The LCD display will indicate if a Dolby signal is present but the signal will not be decoded unless Dolby mode is active 2006 BEL Digital Audio Ltd 4 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Operation The left 4 bar graphs show the audio in the group selected by the A group switch The right 4 bar graphs show the audio in the group selected by the B group switch Dolby mode To enable the Dolby decoder press the Dolby button until the Dolby light is illuminated
21. selected and sent as a stereo signal to the unit s speakers the left most two bargraphs What do the mix assign and left right speaker buttons do These buttons are enabled whenever more than two audio signals are available in Dolby E independent mode and de embedded mode The buttons underneath the bargraphs work with the left right speaker buttons to control an 8x2 mixer This allows up to eight audio channels to be assigned to the left or right audio output channels and so allow custom mix downs It does not affect signals sent to the bargraphs What is the RS232 port for This is provided in accordance with Dolby licence requirements to allow Dolby decoder firmware to be updated 2006 BEL Digital Audio Ltd 18 Version 1 0 BEL DIGITAL AUDIO Appendix A BM A2 E8SHD Appendix A The following table shows all the possible Dolby E Program Configurations or Dolby Digital Coding modes supported by the unit and what each of the eight channels carries Dolby modes 2006 BEL Digital Audio Ltd Ch1 Ch2 Ch3 Ch4 Ch5 Cho Ch7 1L 1R 1C 1LFE 1Ls 1Rs 2L 2R 1L 1R 1C 1LFE 1Ls 1Rs 2C 3C 1L 1R 1C 1S 2C 2S 2L 2R 1L 1R 1C 1S 3L 3R 2L 2R 1L 1R 1C 1S 3C 4C 2L 2R 1L 1R 1C 1S 4C 5C 2C 3C 1L 1R 3L 3R 4L 4R 2L 2R 1L 1R 3L 3R 4C 5C 2L 2R 1L 1R 3C 4C 5C 6C 2L 2R 1L 1R 4C 5C 6C 7C 2C 3C 1C 2C 3C 4C 5C 6C 7C 8C 1L 1R 1C 1LFE 1Ls 1Rs None None 1L 1R 1C 1S None None 2L 2R 1L 1R 1C 1S None None 2C 3C 1L 1R 3L 3R None None 2L 2R 1
22. t on the next button press 2 Dolby D The display will show the Dolby Digital metadata 3 Dolby E The display will show the metadata for the currently selected program If parts of the metadata are not available a warning is shown and the missing metadata will not be displayed e g Audio production information not present mix level and room type not shown Typical Metadata display Note The Dolby decoder card CAT552 currently used in the BM A2 E8SHD does not carry all metadata As these become available software upgrades will be announced 2006 BEL Digital Audio Ltd 9 Version 1 0 BEL DIGITAL AUDIO BM A2 E8SHD Installation Installation The BM A2 E8SHD is designed to be installed in 19 inch bays an equipment tray Ventilation is by natural convection Connector I O The balanced AES digital audio input uses a balanced XLR connector and the unbalanced AES digital audio SPDIF compatible I O uses BNC connectors SDI use BNC connectors and the analogue monitor line outputs use balanced XLRs The analogue outputs are provided on a 25 way D connector An RS232 connector is provided for remote programming of the Dolby decoder CE BEL DIGITAL ADDIG LTO MADE IN THE EC The A2 E8SHD rear view RS232 Dolby interface connector pinout Connector type 9 way D female opeed 9600 bps Format 8 bit no parity 2 stop bits Pin Description Not connected Rx from host Tx to host
23. troduction Eight high resolution tri colour bar graphs are provided with user selectable ballistics and colour break points Up to eight de embedded or Dolby E decoded audio inputs can be selected individually or mixed and directed to each speaker Bargraph meters are arranged in two groups of four the left hand group handles inputs 1 to 4 and the right hand group handles inputs 5 to 8 Each bargraph group can be configured for different meter types and scales and have different colours for level transition points The Dolby decoder decodes Dolby D or Dolby E from the AES inputs or from any group of the SDI embedded audio Dolby E is implemented using two operational modes Independent where all eight channels are available and Dolby Mix Down or Program mode where a selected mix of channels is available according to the encoding used An example would be 5 1 1 1 where three programs are available the 5 1 mix down and the two additional programs 1 and 1 In Independent mode an 8 x 2 matrix allows any of the Dolby E decoded channels to be fed to either or both of the left or right analogue audio output channels This special mix down facility allows a stereo version of a complete Dolby E encoded signal to be heard for all programs This is particularly helpful with Dolby E encoded signals where up to 8 audio signals of a surround sound source can be heard using individual audio elements or a complete aural impression by su
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