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1. Delayed Speaker Impulse Response Internal Delay External Delay Upper Screen SIM 2403 Interface Network Bus Output Cable 70 70 ms Internal Delay Time Cursor position relative to Cursor x center of Data Live 30 00 ms screen Type Result 0 4 Ampl Measurement d Microphone Delay 30 00 Delayed Speaker Reference System Speaker Internal Delay Time Cursor Position System Delayed Speaker Reference Speaker Delay Figure 47a Before Setting External Delay In Single System Delay finder Select Delayed Speaker Branch 60 4 Set the Internal Delay Time for the Delay Branch to compensate for the propagation delay between the Delay speaker and the microphone by using F3 The display should appear as shown in Figure 47b SIM 2201 Sound Analyzer Delayed Speaker Impulse Response Internal Delay Source External Delay Upper Screen SIM 2403 Interface Network Bus Output Cable 70 30 00 70 ms Internal Delay Time Cursor position relative to Cursor x center of Data Live 0 00 ms screen Type Result 0 4 Ampl Measurement Microphone Delay 30 00 Delayed Speaker Refi System Speaker Internal Delay Time Cursor Position System Delayed Speaker Delay i p 30 ms 65 ms Reference Speaker Delay Figure 47b Before Setting External Delay Press F3 to Autoset Internal Delay Time
2. Section 2 Software 2 0 Boot up of the SIM System II Software 2 0 1 Installing and Updating SIM Software On the Hard Drive The hard drive is pre formatted with the original SIM System II Software installed Subsequent updates will arrive on floppy disk with installation instructions The new version is installed onto the hard disk using the Utilities function The floppies should be saved as a backup 2 0 2 Boot up from the Hard Drive 1 Insert the removable hard drive cartridge Do not slam 2 Remove any floppy disk from the floppy drive 3 Turn the SIM 2201 Sound Analyzer on After checking the A floppy drive the SIM 2201 Sound Analyzer will look to the C drive to boot the program 4 The SIM System II Program will automatically load and run 2 0 3 Boot up from Floppy Disk 1 Choose one of the three program disks available v 2 0 Lab v 2 3 Stereo v 2 3 Multi channel 2 Insert the SIM System II Program disk for that version into the floppy drive 3 If it is desired to save data on the hard disk then insert the hard drive cartridge The floppy drive is configured as the A drive and therefore the system will attempt to boot from this drive first The hard drive is configured as the C drive If the program has already been installed on the hard drive there is no need to boot from floppy disk 4 Turn the SIM 2201 Sound Analyzer on 5 The SIM System II Software will automatically load and run Note The b
3. Enable Enables default switching for speakers All on Turns on all speakers Select The Select button Menu provides switching for up to eight speakers controlled by one SIM 2403 Interface Network Speakers which are on are represented by green buttons those off by red The eight buttons are also labeled with the speaker Names entered on the Speaker Setup Panel Press number number keys 1 8 or F1 F8 to toggle individual speakers on off To select speakers at a different SIM 2403 address press PgUp PgDn Since SIM System II addresses up to eight SIM 2403 s up to sixty four speaker systems may be switched During certain Procedures some speakers may be unavaliable for switching in which case the button and speaker Name will be greyed out and the button will not toggle the speaker For example in Lobe Study the present Branch s speaker is disabled Enable Enable provides a quick way to pick a default usual set of speakers to turn on depending on the present Proce dure and Branch Selecting Enable in Single System Procedure will turn on the present Branch s speaker and mute all others As you step through the Branches each Branch s speaker will turn on as the rest are muted 70 Selecting Enable in Combined Systems Procedure will automatically turn on the present Branch s speaker and any other speakers that were previously selected in combined systems or Lobe Study Selecting Enable in Lobe Stu
4. Meyer Sound Laboratories 1993 MSPN 05 102 217 01 A Mee und _ SIM System II Reference Manual Source System Level Noise 1 kHz Sine Var Sine Input A Output B Sine Freq Mic C Source Input A Output B Mic C lt P m ed Uy Reset DISK SOURCE INDEPENDENT MEASUREMENT C SIM 2201 SOUND ANALYZER Keyboard Source Independent Measurement SIM System II Reference Manual This manual reflects Release 5 1 of the system software Meyer Mi Sound Copyright 1993 by Meyer Sound All rights reserved No part of this work covered by the copyrights hereon may be reproduced or copied in any form or by any means graphic electronic or mechanical including photocopy ing recording taping or information retrieval systems without prior written permission of the publisher Meyer Sound 2832 San Pablo Avenue Berkeley CA 94702 Phone 510 486 1166 Fax 510 486 8356 First Printing April 1993 SIM is a registered trademark of Meyer Sound Contents rodulo Minara 3 About This Reference Manual ccsesssesseseseseeeseeteeneeeeneeny 3 Physical Model a a AREA AORAR 3 Section 1 Hardware ssecssesssesssssesesssssesiesnesnessesneeneenes senses 4 1 1 Front Panel Audio Hardware c ecccsssscessssssessesessesesessteeeeeens 4 1 2 Front Panel System Hardware scccs
5. 1 kHz High 500 Hz 22 kHz Range is selected from the Generator Menu 1 1 4 Source Output The source output is a male XLR type A3 with 300 ohm balanced source impedance A green LED located next to the connector is illuminated whenever the source output is active 1 1 5 Headphone Level A rotary level control for the headphone output 1 1 6 Headphone Source Switches Three membrane switches select the measurement bus channel to be moni tored Eq Input A Eq Output B or Microphone C 1 1 7 Headphone Output A three circuit 1 4 phone jack for connecting headphones to monitor the three measure ment signal buses Connect only to headphones equipped with a three circuit stereo jack Minimum impedance is 32 ohms and monitoring is monophonic only 1 1 8 Level Meters Three LED bar meters indicate the signal headroom below full scale digital The meters indi cate the peak level as a ratio in dB to the maximum allowed by the A D converters The meters are post gain control and therefore always indicate the headroom of the converters Their decay time is 500 ms The meters show the level at the Channels A B and C respectively The signal path is version dependent Version Ch A meter Ch B meter Ch C meter v 2 0 Lab Input A Output B Mic C v 2 3 Stereo Eq In Bus Eq Out Bus Mic C v 2 3 Multi channel Eq In Bus Eq Out Bus Mic Bus 1 1 9 Signal Inputs Three female XLR type A3 connectors located
6. Loads data from disk to memory Recall Recalls data from memory to screen The data stored include averaged amplitude and phase measurements unsmoothed and the Coherence or S N data When saving data to disk the Setup must first be saved as the Setup file also serves as a subdirectory for stor ing data files Each Setup has its own data files 2 3 1 Store To store data press Data Store The Group menu 1 8 appears Data may be stored to any of the eight Groups In v 2 3 Stereo and Multi channel versions each Branch has eight memory Groups When storing data a Notepad pops up allowing you to enter up to three lines of text to annotate the stored data To exit the Notepad press lt Ctrl Enter gt If data have been stored at this Group already a prompt Overwrite Y N appears Press Y to overwrite data or any other key to select a different Group ear eas alee Figure 25 Data Store Screen Display 30 DATA V2 3 STEREO amp MULTI DATA V2 0 LAB Recall Memory Tracking Room EQ Branch Compare Compare to ae Branch Disk Drive Floppy Hard Load All Save ASCII aa Load Branch a Delete Save Branch Disk Drive H Freer Hard Save All Save Branch ASCII j Delete Branch Clear F6 Clear F6 Figure 26 Data Menu Structure 2 3 2 Recall To recall data from memory to the screen press Data Recall The Group menu 1 8 appears Sel
7. 20 dB In v 2 0 Lab the Coherence threshold is adjustable for Frequency response measurements in 10 increments Note The setting for the Coherence threshold is valid only for the current number of averages Each time the Average number is changed the Coherence threshold value automatically resets to the de fault value Hegar Exued Lokerceerios Rani rand Fri Gor Jd 1882 Hi Id Snr dore Sadie Siem Srerrsh Bali Lr ee Be Fert prec Frei Mea moan E E Wea dur we Vertical Scale aE dep i ta s zm 2 8 Hulsi a is set to Low Coherence Amplitude Trace Blanked Lt cr im Shines ee itn Mirs gt CTE ArH Figure 37 Coherence Blanking 45 2 5 9 Zoom This is a video display function designed to allow easier viewing of Frequency response data within a specific range Zoom is not available in Spectrum or Delay finder measurements There are four range selections Full Full range 7 6 Hz 22 634 kHz Low 7 6 Hz 200 Hz Mid 125 Hz 2 kHz High 1 kHz 22 634 kHz Shortcut Keys lt Control Page Up Down gt keys serve as shortcut keys for Zoom as a four position toggle Command Sequence Util Zoom Range select Full Low Mid High v 2 0 Lab The Zoom function doubles the number of lines of resolution in Frequency response measurements This increases the effective bandwidth of the measurements to greater than 1 30th octave v 2 3 Stereo and v 2
8. A B C Input Output Mic EQ Room Speaker Result Figure 1 SIM System II Physical Model Section 1 Hardware Input Level Headphone dBFS Meters Level Control 3 5 Floppy Drive Headphone Source Source Level Control Switches amp Indicators Removable Source Type Input Output Mic Hard Drive Indicators Pulse Noise 1 kHz Sine Var Sine iene A System Reset E Z Switch Power amp Drive ona LED Indicators Var Sine Freq Control Keyboard Connector Source Output Connector amp Indicator Headphone Output Connector Input A Power Switch Connector amp Indicator Output B Connector amp Indicator Phantom Power Select Switch Mic C amp Indicator Connector amp Indicator Figure 2 SIM 2201 Front Panel Controls and Indicators 1 1 Front Panel Audio Hardware 1 1 1 Source Level A rotary level control for the source output 1 1 2 Source Type The source signal type is selected from the Generator Menu and the selected source is indi cated by a green LED Noise Pink random noise Pulse A pink filtered Pulse at an average rate of 1 1 Hz The interval ranges from 9 to 1 3 Hz 1 kHz Sine Sine wave for distortion measurement and setting gains Variable Sine For manually operated sine wave sweeps 1 1 3 Sine Freq A rotary control for variable sine frequency The ranges are Low 16 Hz
9. 001 4 368375e 001 1 675267e 001 4 639234e 001 3 534277e 001 3 499455e 000 3 295355e 001 Imag 0 000000e 000 9 821295e 001 8 887328e 001 3 587669e 000 4 724140e 000 0 000000e 000 Imag 1 4383564e 002 6 845629e 001 7 903274e 001 3 264641e 000 2 904307e 000 4 097490e 000 ee h h b b b b re Se Cr Cae a 9 894276e 001 8 720998e 001 8 474381e 001 9 064807e 001 9 909747e 001 8 526236e 001 9 784470e 001 7 9391 19e 001 8 460298e 001 9 889500e 001 9 411441e 001 6 861296e 001 9 387659e 001 8 691644e 001 Coher 8 074194e 001 9 9626 14e 001 9 961203e 001 9 723826e 001 9 751457e 001 8 210352e 001 Coher 9 155470e 001 8 042046e 001 9 926020e 001 7 997649e 001 6 258271e 001 9 592857e 001 87 E Shortcut Keys v 2 0 Lab Data F5 F6 F10 Setup oOr Util F3 lt Ctrl gt F3 lt Ctrl gt Page Up lt Ctrl gt Page Dn lt Shift gt gt lt Shift gt lt lt Shift gt F1 F2 lt Shift gt F3 F4 lt Shift gt F5 F6 Averages R Space Bar Generator F1 Cursor L R arrow keys lt Ctrl gt L R Up Dn arrow keys lt Alt gt P Freeze Frequency response trace and place in memory buffer Data Clear Hides Live or Memory Traces Toggle Setup trace Offset up 1 dB Setup trace Offset down 1 dB Util Autoset delay Util Autoset delay sets to 70 ms Util Zoom Next Util Zoom Previous Util Smooth Next Util Smooth Previous Util Gain A Up D
10. 1 Press any key in response to the initial warning prompt 2 Where necessary edit the values shown in the Advanced CMOS Setup display to be as shown below Typematic Rate Programming Disabled 74 Typematic Rate Delay msec 250 Typematic Rate Chars sec 10 0 Above 1MB Memory Test Enabled Memory Test Tick Sound Disabled Memory Parity Error Check Enabled Hit lt ESC gt Message Display Disabled Hard Disk TYPE 47 RAM Area 0 300 Wait for lt F1 gt if Any Error Disabled System Boot Up Num Lock Off Weitek Processor Absent Floppy Drive Seek At Boot Enabled System Boot Up Sequence A C System Boot Up CPU Speed High Password Checking Option Setup Shadow RAM option Enabled 3 Press lt ESC gt to return to the main menu page Use the down arrow key to select Advanced Chipset Setup then press lt ENTER gt Advanced Chipset Setup Values 1 Press any key in response to the initial warning prompt 2 Where necessary edit the values shown in the Advanced CMOS Setup display to be as shown below 8 bit DMA Wait states 2 W S 16 bit DMA Wait states 2 W S DMA Clock SCLK 2 Command Delay 8 bit Cycle No Command Delay 16 bit Cycle No 8 bit I O Wait States 4 W S 16 bit I O Wait States 0 W S 3 Press lt ESC gt to return to the main menu page Use the down arrow key to select Auto Configuration with BIOS Defaults then press lt ENTER gt Auto Configuration with BIOS Defaults 1 Answer the promp
11. 2 3 Stereo v 2 3 Multi channel 2 4 4 Speakers The Speaker Setup Panel must be configured to reflect the patching of the speaker system and measurement system Type the Name of the speaker system corresponding to each of the Eq channels This Name will be used in the Branch panel Text areas annotate the speaker system type and location Speaker information is entered into the above fields so that the Speaker Panel is fully defined The Speaker Name en tered here will be used in the Branch Setup Panel Each time the Speaker menu See Procedure menu is used the Eq channel and Speaker Names will be displayed The Speaker Name Type and Location fields are saved in the Setup file Crier Figure 34 Setup Speakers Screen Display Multiple SIM 2403 access Each Speaker Panel contains labeling for the eight channels of one SIM 2403 Interface Network When addressing multiple Interface Networks it is necessary to input the speaker and microphone Names on the panel for that address Use Page Up Down keys to see the Panel for the next previous address 2 4 5 Microphones Type the Name of the microphone corresponding to each of the measurement microphone inputs to the SIM 2403 In terface Network This Name will be used in the Branch Setup Panel The Microphone Name Type and Location fields are saved in the Setup file 2 4 6 Branches Branch Naming Type the name of each Branch into the Branch Name field This Name will also serve as the
12. 61 5 Select Procedure External Delay select Pre Eq and select the Reference speaker from the Speaker menu The display should appear as shown in Figure 47c SIM 2201 Sound Analyzer Reference Speaker Impulse Response Internal Delay Source External Delay Upper Screen SIM 2403 Interface Network Bus Output Cable 70 30 00 70 ms Internal Delay Time Cursor position relative to Measurement Cursor center of d Microphone Data Live 35 00 ms screen Type Result 0 4 Ampl Delay 65 00 Delayed Speaker System Internal Delay Time Cursor Position Reference Delayed Speaker Speaker Delay System 30 ms H 65 ms Reference Speaker Delay Figure 47c Setting the External Delay In External Delay Procedure Select Reference Speaker 62 6 While observing the Delay finder trace adjust the external delay time until the peak is at center The display should appear as shown in Figure 47d The external delay line has now been adjusted so that its speaker s sound will arrive coincident with the sound from the Reference speaker at the measurement microphone po sition SIM 2201 Sound Analyzer Reference Speaker Impulse Response Internal Delay External Delay Upper Screen Red SIM 2403 Interface Network Bus Output Cable 70 30 00 70 ms Internal Delay Time Cursor position relative to Cursor c
13. Branch s filename for the data storage See also Section 3 2 Branch Menu Important note You must name each Branch for which you wish to save Frequency response data 38 Editing Addresses and Channels For each named Branch in the system the measurement points must be defined Each Eq and Microphone must have its Address 0 7 and Channel 1 8 defined The Cursor may be moved to the Eq and Mic channel fields for each Branch and the appropriate number entered The labels for speaker and microphone will be updated as new channel numbers are entered Exiting the Branch Setup Panel Pressing lt Control Enter gt will return you to the main menu bar display Ei E ae tai Bisa E a iis as miina 1 1 iii m cz F 1 s ae F iF Fes amp L r G annin E EF E a r abm aas iar AT TETT D h aL ii i LP Figure 35 Setup Branches Screen Display 2 4 7 Delay The Delay Setup Panel allows you to enter the Internal Delay Time for a Branch This might be done when estimating delay times before measurements are made 2 4 8 trace Offset The Trace Offset function repositions the amplitude response traces for convenient viewing and comparison Trace Offset is entirely a video function and does not change the values of the Frequency response measurements Nor does it affect the input range as do the Util Gain controls All data are stored and recalled with their actual ampli
14. Div 0 to 90 dB 7 6 Hz 22 634 Hz 60 dB Flattop Peak tracking 0 dB 1 rms No averaging 5 Div 1 5 70 msec 10 kHz 0 ms 40 dB Half Hann Peak tracking 0 dB Accumulate vector 10 dB Div 30 dB 7 6 Hz 22 634 Hz 60 dB Hann Peak tracking 0 dB 4 vector 15 dB Div 0 to 90 dB 7 6 Hz 22 634 Hz 60 dB Flattop Peak tracking 0 dB Peak hold 28 2 2 6 Measure Menu Reference Guide Measure View Averages Generator Spectrum Eq In 1t Off Eq Out 1k Sine Mic Var Sine Noise Pulse Delay Find Room Accum Off Eq 2 Noise Result 4 Pulse 8 16 Freq Resp Room Accum Off 1 Eq 2 1K Sine Result 4 Var Sine Eq 8 Noise Group 16 Pulse Feedback Eq In Peak Hold Off Eq Out 1 kHz Sine Mic Var Sine Noise Pulse Default Original Setting t Only available setting or not adjustable Smoothing No No Off 241 6th 3rd No Data Trace Offset No No No No Store 1 8 Yes Recall 1 8 Memory Track Save Branch Save All Load Branch Load All Delete Branch Clear No No 29 2 3 Data Menu The Data Menu allows Frequency response data to be stored in memory and saved to disk Data remain in memory as long as the SIM 2201 Sound Analyzer is powered up Unless data are also saved to disk they will be lost when the system is reset or power is interrupted The main data functions are Store Siores live data in memory Save Saves memory data to disk Load
15. Pos Delay time 30 00 ms Trace Offset 4 00 dB Compare Branch Branch 2 These parameters may all be entered from the Setup Menu Each Branch also has eight memory Groups where Frequency response data may be stored When a Branch s data are saved to disk the eight data Groups are saved Shortcut keys lt Alt gt lt Alt gt N selects the next Branch lt Alt gt selects the previous Branch BRANCH V 2 3 STEREO amp MULTI Only Branches 1 and 2 Are Used in Stereo Version Figure 44 Branch Menu Structure 54 3 3 The Procedure Menu PROCEDURE V 2 3 STEREO amp MULTI Pretest Single System Speakers All Off Enable Speaker All Off Select Enable External Delay Pre Eq Post Eq Speaker All Off Lobe Stud Speakers Select obe Study Enabl All Off ee Select Enable Combined Systems Speakers Off elect S Enable All On peakers Off elect nable On Mic Compare peakers Off nable On Post Process Procedure Not Available in Stereo Version Figure 45 Procedure Menu Structure The Procedure menu guides the user through the major steps that constitute a complete analysis and adjustment cycle for a sound system and the selections resemble a typical system alignment chronology These Procedures are Pretest Setup patching verification of hookup Single System Console
16. Recall B Buffer Post Process only Group Left column Data Store Group number and data type Procedure Right column Data Recall Group number and data type Procedure Note Left column 1st 10 characters of Notepad for primary traces Right column 1st 10 characters of Notepad for secondary traces Spkr Left column Number of speakers on for primary data Right column Number of speakers on for secondary data Offset Left Column Frequency response Amplitude offset in dB for primary data Right Column Frequency response Amplitude offset in dB for secondary data 12 2 1 2 Cursor status area The lower left center box refers to the Cursor trace Data Type THD Hz dBV Data Type Delay ms Ampl Data Type Mean S N Hz dB Cursor Hz dBV Data Type THD Figure 9 Measure Spectrum Cursor Status Area Live Incoming measurement data only v 2 0 Lab Ref Generator or Input A Meas Output B or Mic C v 2 3 Stereo and v 2 3 Multi channel Eq in Eq out Mic v 2 3 Multi channel Ref mic MeasMic Mic Compare only Total harmonic distortion in percent at the Cursor position Frequency of Cursor location X axis Amplitude in dBV at the Cursor Cursor ms Ampl Data Type Delay Figure 10 Measure Delay Finder Cursor Status Area Live Incoming measurement data only v 2 0 Lab IFT Inverse Fourier Transform v 2 3 Stereo and v 2 3 Multi channel Room speaker Eq or
17. The overall status window will indicate that data is below the threshold Time Bandwidth Selection The Delay finder can be configured so that any of four different time intervals can be measured The choice of time in terval is based upon the span of time you wish to view The default setting is 70 ms Each of the Time settings has an associated Bandwidth Time Bandwidth 3 dB Increment 70 ms 10 kHz 20 us 140 ms 5 kHz 40 us 280 ms 2 5 kHz 80 us 560 ms 1 2 kHz 160 us Setting the Internal Delay Time Once the Delay finder is running the Cursor will move to the largest amplitude on its measurement trace as shown in Figure 22a The center of the screen will read the Internal Delay Time Once the Cursor has stabilized select Util Autoset delay or F3 This sets the Internal Delay Time to the value corresponding to the Cursor position The new value will become the center of the screen and the amplitude peak will move to the center of both the upper and lower screens as shown in Figure 22b Notes regarding the Delay finder and measuring loudspeakers The leftmost peak in the impulse response corresponds to the arrival of the direct sound from the loudspeaker at the microphone Echoes will appear to the right of it because they arrive after the direct sound If the echoes are stronger than or equal to the direct sound the Cursor may lock onto the echo In such instances selecting select Util Auto set delay or F3 will result i
18. aa ERGE 78 4 6 Factory Service required eessen 78 Section 5 Appendices sssscsssssssssesssssssssssestsesestestseatseateeees 79 A Connection Diagrams c sccsscsecsessessseesnsssesssessnessssseesnesseesneses 79 B Gable Pinout Charts cienne aia 83 C ISO Input Channels A and B s s s 85 D ASCII Data File Example ccccccscsessesessesssesesesereesen 86 E Shortcut KGS iiser ideiei tcana a 88 Vo AO LAD reani na a E 88 v 2 3 Stereo v 2 3 Multi channel sser 89 Introduction About This Reference Manual The SIM Reference Manual is intended to serve as a reference document for the users of SIM System II The manual is divided into five sections The main body of the manual is devoted to the v 2 0 Lab configuration Wherever differ ences occur between this and the v 2 3 Stereo and v 2 3 Multi channel versions the version related aspects are specified Section 1 Hardware This section describes the front and rear panel connectors knobs and switches Section 2 Software This section describes the system software beginning with the boot up The remainder of Section 2 is devoted to a discussion of each of the Main menus and their sub parts The order of the Main Menu choices in this manual follows the menu bar from left to right for the v 2 0 Lab configuration There are three Main Menus that appear exclusively in v 2 3 Stereo and v 2 3 Multi channel and these are covered in Section 3 The or der of
19. instantaneous amplitude and phase values are shown as yellow dots The averaged values will not appear until each frequency bin contains at least the number of averages selected 2 6 1 The Averaging Menu The Averages menu selects the number of averages and the average type The numerical selections are 2 4 8 16 First in first out Accumulator FIFO First In First Out averaging uses the last N 2 4 8 or 16 samples and divides them by N When more than N samples have been obtained then the oldest of the samples is deleted and the new one is added in This provides a continuously updated averager No weighting function distinguishes among the data all data are treated equally Until the averager has N samples for a frequency bin only the incoming instantaneous Frequency response data for that bin yellow dots will be shown After N samples are obtained for a bin the averaged data will be displayed as a trace The principal advantages to this type of averaging are that each frequency bin has the same number of samples and no restart is required when system adjustments are made Fewer averages will yield faster display of the measured data at the expense of greater stability and accuracy Mea surements substantially contaminated with noise should use more averages Systems in reverberant halls for ex ample will require more averages than near field measurements in quiet environments 47 In the Accumulator type of a
20. is designed to measure sound systems with an audience present so certain functions that could dis rupt a performance are disabled in Show Procedure During show Procedure The Generator is disabled All speakers must be on so speaker muting is disabled Only the Post Process and Quit Procedures can be selected during the show Because of these assumptions it is necessary to make absolutely sure that you are ready to move into the Show Pro cedure All steps that precede the Show Procedure should be performed before moving into the Show Procedure Note for v 2 3 Stereo users The Eq out signal passes through an internal relay that is capable of muting the speaker sends Once you have entered Procedure Show there are no commands in the software that can mute the speakers If the SIM 2201 Sound Analyzer loses power the relays will not mute and signal will continue to flow as before However it is possible that an inadvertent hardware error could cause the mute relay to close For a true hardwire parallel connection as implemented in the SIM 2403 Interface Network you should insert a Y cable in the path at the Eq Output cable in place of the To Amps cable 68 Note for v 2 3 Multi channel users When measuring during a concert it is strongly advised that the system be set into its Safe configuration The System Muting configuration of the SIM 2403 Inter face Network which is used during th
21. of some specific ap plications The scope of this text will be to give an overview of the Procedure menu The SIM Applica tions Guide will serve as a reference for the specific techniques and system design criteria developed by Meyer Sound 3 3 1 Pretest The Pretest Procedure is used to establish that proper connections signal flow and linearity are maintained in both the measurement system and the system under test Speakers All On speakers may not be muted Measure Spectrum only During Pretest Procedure the engineer is able to unobtrusively come on line hence no muting Typical tasks in clude loading a Setup file See Section 2 4 Setup Menu or creating a new one for the day s job After this is com pleted signal is passed through the sound system to determine whether the system patch is correct 3 3 2 Single System The Single System Procedure incorporates speaker muting Measurements performed in Single System will turn on only one speaker system at a time Applications include e Console drive level calibration e System distortion measurements Setting the Internal Delay Time for each Branch compensating for the propagation delay between the speaker and microphone Polarity verification Speaker system level setting Initial equalization To make and store Single System measurements follow these steps 1 Select the Single System Procedure and enable the speaker Procedure Single Sy
22. on the front panel provide direct access to the three measurement points Each channel has an LED that illuminates when the channel is active Input A and Output B are both signal inputs the nomenclature refers to the input and output respectively of the device under test The maximum signal level for these inputs is 28 volts peak They are wired pin 3 hot and incorpo rate Meyer Sound s ISO Input circuitry see Appendix D providing full transformer isolation and accommodating any connection configuration with no change in gain The Mic C input is wired pin 2 hot to conform with the accepted standard for measurement microphones and can be supplied with Phantom power 48 VDC via a front panel membrane switch v 2 0 Lab Input A Output B and Mic C are selectable v 2 3 Stereo Mic C is active Input A and Output B are patched through the Stereo Snake v 2 3 Multi channel No front panel input connections are active except in the special case of Pro cedure Mic Compare where the front panel Mic Input is used Otherwise all connections are made through the SIM 2403 Interface Network 1 1 10 Phantom Power 48 Volt Select Switch A membrane switch that toggles the phantom power to the Mic C input connector A red LED located next to the switch is illuminated when the phantom power is enabled 1 2 Front Panel System Hardware 1 2 1 Power Switch A pushbutton to switch power to the system 1 2 2 Re
23. present Branch to Additional notes for v 2 3 Stereo and Multi channel When storing and recalling data the data are tagged with the name of the Procedure These Procedure names ap pear on the Group 1 8 menu the Notepad and the data panel This helps to organize the large amount of data that may be gathered when using multiple Branches Groups and Procedures 2 3 14 Related Commands and Shortcut Keys F5 Freeze Pressing F5 stores live Frequency response traces to memory replacing any memory traces already on screen F5 is useful for quick A B comparisons and other occasions when it is not necessary to keep the data in long term memory F6 Clear Pressing F6 clears memory traces F10 Live Memory Display Toggle This key is useful when you wish to quickly toggle between live and memory traces Pressing F10 hides the memory traces Pressing it again brings back the memory traces and hides the live traces a third keypress restores both live and memory traces None of these three commands affect data stored using the Data Store command 34 2 4 Setup Menu SETUP V2 0 LAB SETUP V2 3 STEREO amp MULTI Reference Channel Generator Speakers Input A Microphones Measurement Channel Output B Branches Mic C Trace Offsets Trace Offsets Branch Delay Disk Drive Flo Disk Drive Hen Floppy Hard Delete Not Used in Stereo Version Figure 28 Setup Me
24. the Sub Menu choices typically follows their position in the pull down menu from top to bottom Section 3 Stereo and Multi channel Menus This section describes the main menu items that are specific to v 2 3 Stereo and v 2 3 Multi channel Section 4 Service This section describes service of the SIM 2201 Sound Analyzer Appendix Connection information connector pinouts and Ascii data file sample Physical Model SIM System Il is designed for not only characterizing but also electronically correcting acoustical systems Its archi tecture and nomenclature follow a physical model consisting of a loudspeaker in a room object of measurement with a measurement microphone and a parametric equalizer correction network connected in series with the input signal The excitation is assumed to be neither totally random nor predictable though known test signals such as noise or stepped sine waves may be used The instrument s three input ports are connected respectively to the correction network input A the network output B and the measurement microphone C Three different transfer functions may be computed Room Speaker the unequalized response of the speaker in the room Eq the equalizer response and Result the equalized speaker system response Excitation E Correction Kpa Object of Measurement Music Input O Signal CP 10 Parametric Equalizer Loudspeaker in Room with Measurement Microphone
25. tude values but can be displayed with an offset The offset range is 12 dB If the trace is more than 10 dB off from the desired position it is best to use Util Gain so as to preserve dynamic range In v 2 3 the Trace Offset is applied to Room and Result amplitude traces Shortcut keys or increases offset 1 dB decreases offset 1 dB Note The amplitude shown by the Cursor is its measured value not inclusive of the offset 39 2 4 9 saVe This command saves the Setup file to disk The Setup file includes Data for each Branch including the Branch Name Speaker and microphone addresses and channels Internal Delay Time Trace Offset Compare Branch and Notepad Speaker and Microphone Names Types and Locations Venue Artist and Engineer s name Average number and type e Master Gain Mic Gain all vertical scales Smoothing and Coherence threshold Setups can be saved to either the floppy or the hard drive You will be prompted for a filename The Setup filename will serve as the subdirectory name under which your present data files can be stored so it is always necessary to save a Setup before saving data files Type in the name and press lt Enter gt The directory of Setup files on the disk will be searched If the name is unique the Setup will be saved If there is a file with the same name a prompt will ap pear Overwrite Yes or No If the Y key is selected the new Setup will overwr
26. until a usable Frequency response is obtained 8 Select Store mic Eq from the Data Menu 9 Recall the stored data from memory 10 Connect the Generator output to the console input in place of the lavalier or foot microphone select Noise under the Generator Menu and adjust the level on the SIM 2201 front panel 11 Select Memory tracking Room Eq from the Data Menu 12 Select 1 Eq from the View Menu 13 Adjust the system equalizer to match the stored Frequency response Equalization of the microphone is now complete Unplug the generator from the console input and re patch the micro phone SIM Reference Mic connect to SIM 2201 front panel Mic input EQ In Out Snake System PA or SIM 2201 Sound Analyzer Lavalier or Snake Foot Mic Console Ch Insert Ch 1 Red Send Stereo Snake k Console Mic Ch Insert Ch 1 Red In Send Ch Insert Amp Ch Insert Ch 1 Wht Rec Rec EQ out 1 Mix Console Blu Mix Console Bik EQ out 1 Blk Blu Figure 51 Mic Eq Connections for v 2 3 Stereo Left and v 2 3 Multi Channel Right 66 3 3 7 mic Compare v 2 3 Multi channel only The Mic Compare Procedure allows for comparing different measurement microphones with a single reference micro phone The Reference microphone is plugged into the mic input on the front panel and routed internally to Channel A ordinarily the Eq Input The Measurement microphone is sel
27. x rra a raaa a aee aE E 73 4 1 Non fatal failures sssesssssssseessrrrssssrrsnssnreessrreesrrrrsnrrnrnsnreeens 73 4 2 SIM 2201 BIOS Setup sssescsscscscecsessseesssesssesestesesneesneessneesnseees 74 Accessing BIOS Setup Program sssrin 74 Navigating and Selecting Values scssssseesseessessessesneesnesees 74 Standard CMOS Setup Values 00 cecseessecsesseeseesteestesseesneeseeeees 74 Advanced CMOS Setup Values 00 74 Advanced Chipset Setup Values 0 0 75 Auto Configuration with BIOS Defaults 0 0 75 Auto Configuration with Power On Defaults ccccssseseseeees 75 4 3 User Serviceable 1 3 0 weal ata h huuniotie nananana 76 AIT OVGA n lonini taena i aaar EA EEEE 76 4 3 2 IDE Disk controller ceseseeseeccssesteseeeesseseeeceseesesueecesneateseeees 76 43 3 VO Caida ininde nh n 77 4 3 4 DSP Card eessesscsesssssssstesseessncecsnceenseessecsunesnsessnseeneesseerenesses 77 435 Motherboard istic cca savccinsinssnttacescateavcinssiscesvitnenveabveseaweescatheas 77 4 3 6 SIMMs Single In line Memory Modules csssseeeeeees 77 43 7 Power SUPR ecra aE AN 77 4 3 8 DC Converter POB ssssssssssssssrisriirrrrirsrrssrsssssnsssrsrrrirrirrrrrrerrsss 78 439 FOY WVE eira eaaa EAA 78 4 3 10 Hard Drive Receptacle oc 78 4 3 11 Hard drive Cartridge 0 cesses 78 4 4 Rear panel service c sceseccecsesseseeseesescsesseeseeatsnsseeeceatsnseeeeseetens 78 4 5 Front panel S rviCe svckid astdeaten r
28. 3 Multi channel The Zoom function is a display function only and has no effect upon the number of lines of resolution in Frequency re sponse measurements 2 5 10 Print The Print utility is used to make hard copy for publication or presentation Printouts occupy approximately half a stan dard 8 1 2 by 11 page The printer must be connected to the parallel port on the rear panel marked Printer A standard D25 fully wired pin to pin cable will make the proper connection Printer model selection The system will prompt you to select a printer The following printers are permanently installed Apple LaserWriter Series HP DeskJet 500c HP LaserJet Series Il Other Press lt Enter gt to confirm your selection The Other printer is user installable Installation of a user selected printer is described in Section 2 0 5 Print format selection Once a printer is selected a sub menu will prompt you to select color or black and white mode B W Black and white no grey scale Color Prints color on the HP DeskJet 500c or other color printers and grey scale on monochrome printers 46 2 6 Averages AVERAGES V2 0 amp V2 3 Restart Vector RMS Figure 38 Averages Menu Structure SIM System II utilizes a unique form of averaging implementing Amplitude thresholding The threshold function serves to avoid some of the common inaccuracies of FFT analyzers when an unknown excitation is used The
29. 5 797662e 001 16 78467 1 1 048826e 000 1 923313e 001 1 9 252884e 001 18 31055 1 5 6631 63 001 8 4391 34e 001 1 9 786824e 001 19 83643 1 6 006017e 001 3 571306e 001 1 9 770353e 001 21 36230 1 1 691158e 001 9 381513e 002 1 7 763644e 001 22 88818 1 6 022303e 001 4 340758e 001 1 7 807058e 001 24 41406 1 2 733261e 001 7 722968e 001 1 7 033427e 001 25 93994 1 1 138830e 000 6 943674e 001 1 9 858620e 001 27 46582 1 1 405302e 000 1 034664e 000 1 9 872375e 001 28 99170 1 5 814646e 001 1 970626e 000 1 9 884516 6 001 86 30 51758 32 04346 33 56934 35 09521 36 62109 38 14697 39 67285 41 19873 42 72461 44 25049 45 77637 47 30225 22265 63 22656 25 1 Eq frequency Valid 7 629395 9 155273 10 68115 21875 00 22265 63 22656 25 Result frequency Valid 7 629395 9 155273 10 68115 21875 00 22265 63 22656 25 Notepad line 1 Notepad line 2 Notepad line 3 ee h h b b b h h b d b O 1 4 983518e 001 2 167822e 000 7 843834e 001 5 120405e 001 1 871092e 000 1 193832e 001 1 274758e 000 5 897506e 001 4 834534e 001 2 227576e 001 2 797 758e 001 7 594414e 001 3 145627e 000 4 933742e 000 Real 0 000000e 000 1 893269e 001 1 884563e 001 1 898098e 000 6 710988e 001 0 000000e 000 Real 1 104442e 000 8 867108e 001 4 380753e 001 1 732928e 001 2 270072e 000 2 630178e 000 2 200281e 000 1 481548e 000 1 618317e 000 2 049959e 000 8 288648e 001 1 862051e 000 6 395878e 001 5 475165e
30. 550 Bus Output 10 ft Cable From Previous SIM 2403 AMP 211766 1 ae Bus Extender Cable 2 ft BUSS OUT BUSS IN MICROPHONE EQIN OUT SYSTEM SAFE SYSTEM MUTING Sopa 15VA 50 60 Hz 1 4 A SLO BLO D H 000 ooo 000 g See Power Control Cable Cable 10 ft To AC Outlet From Previous SIM 2403 Figure 57 v 2 3 Multi Channel Connections Between the SIM 2201 Sound Analyzer and SIM 2403 Interface Network 81 BUSS OUT BUSS IN MICROPHONE EQIN OUT ay ine SYSTEM MUTING ig ee H O g Yellow Red Souriau 851 01A24 61S50 Souriau 851 06A24 61P50 Souriau 851 06A20 39P50 lt gt lt oS tor ma lm 10 ft 10 ft Microphone Snake EQ In Out System Snake Snake To To Equalizer From Equalizer From System To Speaker Microphones Inputs Outputs Sends Systems Figure 68 Connections Between the SIM 2403 Interface Network and the PA System 82 B Cable Pinout Charts Red White Green Blue Yellow Brown Orange White Wa vo0aQQ0o7 gt 3 5 oomo r zZzgv lt N7TDIAZVU X oO Buss Output Pinout Chart Pin 3 Color Pin 2 Color Pins 3 2 1 P q n EQ In Buss Yellow d J K EQ Out Buss B C Y Mic Buss Stereo Snake Pinout Chart Pair Pin3 Color Pin 2 Color Pin 2 Pin1 C ate 2 3 4 5 6 7 8 9 Console 1 C
31. 6 PR EAE E E E A OE E A 37 2AA Speaker Sasiia a harna 38 24S MUONO ES iseiscaisis tian tiviadiaiatsiiiavisediishiiieacdeaetc 38 24 6 BYANCN S ari iiri E AE 38 PENNE Ia S EE A EA Genie 38 Editing Addresses and Channels c sscsessessesseessessessesneeens 39 Exiting the Branch Setup Panel c secssesessseseseseeseesneens 39 ZAT DOA i cisecss ran cantante A E A A AEE 39 24 o trace ONS ict sects i A a A ia 39 PEA E E N 40 PA NOESY To ESPAA EAE E 40 2A TT AEE aa AA 41 2 412 NOW EEE E E A 41 2 4 13 Default Set p kiniinin n 41 25 UU MOMU E A E as caetedchesessenyeliene dh 42 2 0 1 Vettical SCal6 nerien 42 25 2 SMOG nia aE E E AT 43 2 5 3 Mastet Galf ainan aa an eunis 43 Setting Master Gain cesseeccecsesseesseesseessessesseeeseeeseesneesteeaeseneeaess 44 Shortcut Key Sironen AE aha 44 2 5 4 Gain A B or C v 2 0 Lab Only occ 44 2 5 5 Position Mic Gain v 2 3 Stereo and Multi channel only 44 2 5 6 Autoset Delay FI oo scececseeteeeeeeseseeteseesiesieseseneeenen 44 2 5 7 Amplitude threshold v 2 0 Lab only s es 44 2 5 8 Coherence threshold v 2 0 Lab only sssr 45 2 5 9 ZOOM anai ra ra EA 46 DAG AVERAGES A E E 47 2 6 1 The Averaging Menu ccceccsesssseseseseeceseseeeesteseeeeseenees 47 2 6 2 Average Menu Selections 48 AT GUSOT naerda ere NR 49 2 8 GENTAN asiarra A A EAA R aa 50 2 8 1 OTR FA ra aeran ea ain A EA aR 50 2 8 2 NOISE hurgintnunnip nannan aaa aan 50 2
32. 83 PUSO aironi r raa 50 2 8 4 1 KHZ SING eannan a aA 50 2 8 9 Variable SINE i isinsin aana 50 2D meN o AEAEE E E AEE E A O E E PAARS 10 o AAAA E A E aan 2 9 2 KEYS anainte a en aA ERE ASA EAE 2 9 9 Na MOS iian iraan aa AOR 294A MO a a a a 2 9 5 Procedure Section 3 Stereo and Multi channel Menus 52 Se View MENU irienn eeraa EAA E Ea 52 3 1 1 Single Channel Spectrum and Feedback Find s 52 3 1 2 Dual Channel Delay Finder and Frequency response 52 3 2 Branch Menuda aea eaa aa aa Meriter 53 IOL EA EE ae AAE A AE 54 3 3 Procedure MENU oniran na 55 KEPT ALEE EE R 56 9 9 2 OINGIC Systemi ain a iara 56 3 3 3 External Delay oiana ir RAA 57 Defitsit ae a aati 57 Post Eq Delay LIn s sessessessecsssstsssessessesseestestestesseeseensentenens 57 Pre kq Velay Lines ieira ir aE E 60 9 0 4 Lobe Studyatia E aa on E 64 3 3 5 Combined SYSTEMS 64 3 3 6 MIC EQ occ Foot Mouse Mics 3 3 7 mlc Compare v 2 3 Multi channel only 67 Microphone CValUation oo eecessesteseseseesteneeetesnssesnesneeateeteaneans 68 Acoustic response measurements without speakers s s 68 3 3 8 SNOW aaaeaii ulti tires A iriotndtentait as 68 3 3 9 POST POCE Sin a a A AAN 69 33 10 Quit aiara aa a A 69 3 3 11 Speaker Menu ceecsecssesseseesesseeseseesesneesneeseeneeeneeseee 69 SECC eraras AA E wie epee AAE 70 E O EE E A T A E teas 70 Select and Enable nisrani a 71 DUNE N EEEE E AI IEA A E A E AE 71 Section 4 Service
33. Internal Delay to Compensate for Propagation Delay and Synchronize Channels 21 SIM 2201 Sound Analyzer Source External Delay Direct sound Echo Internal Delay EQ In A Upper Screen Speaker Measurement System Microphone 70 30 00 70 ms ZANAN Mic C J som Propagation Delay Internal Delay Time Cursor position relative to Cursor center of Data Live ms screen Type Result Ampl Delay 30 00 Internal Delay Time Cursor Position Figure 22c Pre Eq Delays External Delay Does Not Affect Propagation Time Measurement SIM 2201 Sound Analyzer Direct sound Cursor on Source Internal Delay Echo 3200 Upper IFT Speaker Measurement Screen System Microphone d a i 70 30 00 70 ms N Mic C Internal Delay Time Cursor position relative to 30 ms Cursor center of F Data Live 35 00 ms screen Propagation Delay Type Result 0 2 Ampl t Delay 65 00 Internal Delay Time Cursor Position Figure 22d Characterizing Reflections Placing the Cursor on the Echo Provides Direct Measurement of Ini tial Time Delay Gap 22 the highest frequency components Always fine tune the Internal Delay setting using the smallest Delay finder time window 10 kHz bandwidth even small time offsets between the Reference and Measurement channels will degrade the quality of Frequency response data at high frequencies The Internal Del
34. Phase 0 degrees center Util Vertical scale Phase 180 degrees center The vertical scales are independently adjustable and are stored as part of the Setup file You may choose either Co herence or S N 2 5 2 Smoothing Smoothing can be applied to the Frequency response data Only amplitude and phase responses are smoothed All amplitude and phase traces are formatted the same smoothed or not All data are stored at full resolution regardless of smoothing Smoothing is never applied to Coherence or S N traces Smoothing of the amplitude and phase traces is achieved by averaging above and below each of the frequency bins Narrow 1 24th Octave No smoothing or interpolation 1 6 Octave Sixth octave smoothing and interpolation 1 3 Octave Third octave smoothing and interpolation 2 5 3 Master Gain The Master Gain menu sets the gain of the Eq In A Out B and Mic C in 10 dB increments Setting the Master gain optimizes the measurement system s gain structure to deal with different source levels Changes in the Master gain will not cause any of the Frequency response traces to move up or down since the Frequency response is sensi tive only to the relative gain between channels It will move the Spectrum response up or down since the spectrum vertical display is referred to full scale input level The default Master Gain is 0 dB for all channels v 2 0 Lab The Master Gain Menu selections refer to the gain
35. Result Delay offset between Reference channel and present Cursor position in ms Delay offset between Internal Delay Time and present Cursor position in ms Amplitude ratio at the Cursor Figure 11 Measure Frequency response Cursor Status Area Live Incoming measurement data Memory Data from recall Buffer v 2 0 Lab Ampl amplitude Phase S N signal to noise distortion or Coher Coherence v 2 3 Stereo and v 2 3 Multi channel Room speaker Result Eq 1 Eq Mean Signal to Noise or Coherence over entire bandwidth Frequency at the Cursor Amplitude in dB at the Cursor 13 2 1 3 System status area The lower right center box displays global instrument parameters Delay Thresh B W Window Delay Thresh B W Window Delay Thresh B W Window 76 06 ms 60 dB 1 6 oct Flattop Figure 12 Measure Spectrum System Status Area Internal Delay Time in ms Amplitude threshold referenced to full scale in dB Effective bandwidth of passband filter Window function applied to time record Delay 76 06 ms Thresh 40 dB BW 10 kHz Window Half Hann Figure 13 Measure Delay Finder Status Area Internal Delay Time in ms Amplitude threshold value referenced to full scale in dB Effective frequency bandwidth 3dB point Window function The Half Hann Window is applied to the Frequency response data prior to the IFT 76 06 ms 60 Coh 1 24 oct Hann Figure 14 Measure Frequency re
36. Status Area at the lower center displays information about the overall system status Acquiring Data Figure 18 Overall Status Area Acquiring Data Processing incoming data Pause A menu is open suspending processing Input disabled Space bar has disabled the input press it again to continue Data rejected Overload of the measurement inputs data are rejected Data lt threshold All signals are under the Amplitude threshold Writing Writing to disk Reading Reading from disk Searching Searching for data files on disk Printing Printing screen Averaging Complete 999 averages have been accumulated 2 2 Measure Menu The Measure menu selects the type of measurement to be made 2 2 1 Spectrum Spectrum measurements display the single channel amplitude response of each of the measured input channels as absolute amplitude in dB vs frequency in Hz Reference Channel Measure ment Channel Figure 19 v 2 0 Lab Measure Spectrum Screen Display 16 Spectrum Axes The top of the amplitude axis represents full scale digital at each frequency The vertical scale is adjustable in dB div The frequency axis is a logarithmic display with 24 points octave typical The equivalent percentage bandwidth is fixed at 1 6th octave due to the width of the flattop window Below 20 Hz the axis is linear Spectrum Cursor The Cursor value is read out in frequency and dBV rms Note that the Y axis is read in dB FS full scale while t
37. also important that care be exercised to prevent the mics from reflecting into each other or from being so far apart as to be in different acoustic environments Acoustic response measurements without speakers This type of Mic Compare measurement is dependent upon the placement of the reference microphone the one plugged into the front panel Therefore it is important that the Reference mic be placed in a position that is known to have particular type of response The Frequency response between the mics shows the difference between the two positions The microphones should be of the same type with a matched response so that the Frequency response is limited to the difference in the acoustic responses at the different positions Use the Microphone Setup Panel to label the microphones types and positions Use the Branch Setup Panel to define the Branch names and assign one mic to each of them The Eq Input and Eq Output channels are not used in the Mic Compare Procedure and their settings are irrelevant To make and store Mic Compare measurements follow these steps 1 Select the mlc Compare Procedure 2 Measure Delay finder Set the Internal Delay Time to compensate for the propagation delay between mi crophones 3 Select a Branch which owns the desired Microphone channel 4 Measure Frequency response 5 When the measurement is complete you may store it using the Data Store mlc Compare command 3 3 8 Show SIM System Il
38. ame three speakers will still be selected Summary The selection of multiple speakers made in Lobe Study Combined Systems and Mic Eq is remembered by the sys tem when the Procedure is changed Once a set of speakers has been selected from the Speaker Select Menu Speaker Enable will turn on the appropriate speakers based on the current Procedure and Branch 71 3 3 13 Procedure Menu Reference Guide Procedure Pretest Single Sys External Delay Lobe Study Comb Systems Mic EQ Mic Compare Show Post process Default Original Setting t Only Available Setting or not user adjustable Measure Spectrumt Spectrum Delay finder Freq Response Feedback find Spectrum Delay finder Spectrum Delay finder Freq Response Feedback find Spectrum Delay finder Freq Response Feedback find Spectrum Delay finder Freq Response Spectrum Delay finder Freq Response Spectrum Delay finder Freq Response Feedback find Freq Response Speaker All Ont All Off Enable All Off Select Ref Enable All Off Select Enable All Off Select Enable All On All Off Select Enable All On All Off Select Enable All On All Ont All Ont Trace Offset Not Yest Not Not Not Yest Yest Yest Yes or No Generator Off 1 kHz Sine Var Sine Noise Pulse Off 1 kHz Sine Var Sine Noise Pulse Off Noise Pulse Off 1 kHz Sine Va
39. and adjusting so that the Mic input level most closely matches the Eq In and Out levels The relationship between the Eq Input and Eq Output gain and the Mic Gain is changed only when the Mic Gain is changed not the Master gain Shortcut Keys lt Shift gt F5 F6 move position Mic Gain up down 10 dB 2 5 6 Autoset Delay F3 This function is available only in the Delay finder The Internal Delay Time is set to the Cursor position 2 5 7 Amplitude threshold The Amplitude threshold is designed to improve the signal to noise ratio of Frequency response measurements by pre screening the incoming data The level at each frequency bin in the Reference channel is checked against the threshold and only data at those frequencies that clear the threshold are used for computation This is particularly useful for sources such as music where the density and frequency content of the incoming signal is variable The Am plitude threshold is adjustable for Frequency response and Delay finder measurements in v 2 0 Lab 44 2 5 8 Coherence threshold Coherence thresholding blanks Frequency response data at frequencies where there is a low signal to noise ratio The Coherence threshold ranges from 90 to 20 depending upon the number of averages selected This threshold can also be expressed as Signal to noise ratio in dB Its relationship to the averaging number is as follows Avg Coh Thresh dB SN 2 90 20 dB 4 60 3 5 dB 8 40 3 5 dB 16 20
40. atus Status Area Area Area Fig 7 Fig 18 Fig 9 Fig 12 Fig 15 Figure 5 v 2 0 Lab Main Screen Data Hex Cursor Pi System P Input ye Status Status Status Status Status Area Area Area Area Area Fig 8 Fig 18 Fig 11 Fig 14 Fig 17 Figure 6 v 2 3 Multi Channel Main Screen 11 2 1 Status Panels 2 1 1 Data Status Area The lower left area of the screen displays information about the traces in two columns The left column refers to the primary traces bright colors and the right column refers to the secondary traces muted colors Data Traces Live Memory Data Group 2 Lab Data 1 Lab Data Notes On Axis 15 vert Offset 4 00 dB 4 00 dB Figure 7 v 2 0 Lab Data Status Area Traces Live Incoming measurement data Memory Data from Recall Buffer Group Left column Data Store Group number and data type Right column Data Recall Group number and data type Note Left column 1st 10 characters of Notepad for primary traces Right column 1st 10 characters of Notepad for secondary traces Offset Frequency response Amplitude offset in dB Data Traces Live Memory Branch 1 Left 1 Left Group 2 Comb Sys 1 Single Sys Notes After Re EQ Initial EQ Spkrs 12 _ 1 Offset 0 00 dB Figure 8 v 2 3 Multi Channel Data Status Area Traces Live Incoming measurement data Memory Data from Recall Buffer Memory A Data from Recall A Buffer Post Process only Memory B Data from
41. aved to disk the Setup directory is searched for a file with the same name If there is already a file with the same name the message File Exists Overwrite Y N appears Press Y to overwrite data or any other key to return to the filename prompt If a file cannot be saved because of disk problems the message No such file or directory appears Some of the rea sons for this include Disk not present or not installed in drive completely Unformatted disk Disk is full Disk is write protected sliding tab on floppy disk shell Disk is not proper type High density 1 44M diskettes must be used Bad Sector s on disk 2 3 6 dElete Data files on disk which are no longer be needed may be deleted Press dElete from the Disk menu select a file to delete and press lt Enter gt Once a data file has been deleted it cannot be recovered 2 3 7 Save All In v 2 3 Stereo and Multi channel the Save All command provides a convenient means of saving to disk data from all Branches The Branch names are used as the filenames This command backs up your data so that an inadvertent system reset will not cause a loss of data 2 3 8 Load All In v 2 3 Stereo and Multi channel the Load All command searches the Setup directory for any files matching the present Branch names Each file that matches a Branch name is loaded into that Branch 2 3 9 save Ascii Frequency response data may be saved as an ASCII file fo
42. ay Time does not affect signals in the system under test only the time synchronization between the measurement channels Pre Eq External Delays As shown in Figure 22c an external delay line that is patched before the equalizer affects both the Reference and the Measurement channel equally as it is treated as part of the source External delays therefore will not affect the mea surement of propagation delay when the system is configured as shown in this Figure Special Procedures are used to align delay fill systems using external delay lines see Section 3 3 3 External delay Characterizing Reflections The Delay finder may also be used to obtain direct measurement of the Initial Time Delay Gap t Recognized as a primary determinant of concert hall acoustic quality t is defined as the time delay between the arrival of the direct sound and that of the first reflection at a given location As Figure 22d shows simply placing the Cursor on the ampli tude peak of the first reflection after setting the Internal Delay to compensate for propagation causes f to read in the Cursor Status Area Later arrivals t t etc may similarly be measured against the direct sound arrival Polarity Checking The Delay finder displays the system impulse response and thus preserves polarity information A positive going im pulse the highest point indicates a net non inverting system whereas a negative peak indicates inversion To check polarit
43. cecssessseeseesteesteeseesneeeeeeeees 5 1 3 Rear Panel Audio Hardware oo sseessesesestestestesseeeestesteateeteeneeneny 6 1 4 Rear Panel System Hardware scsssssssssssessessessesssesseeseeseeseees 7 Section 2 Software ssscssesssesesssesesessessesnsteesesnesneesesnesnesaaes 8 2 0 Boot up of the SIM System II Software cecsseeseeeees 8 2 1 OtalUS Panel Sapa neces an 12 2 1 1 Data Status Area oo escent 12 2 12 Cursor status area ss citi Adadcteadeadeneittd ak 13 2 1 3 System status ANCA eeseesseesseeseestesstecstesesstessteeeteseeseeeaeeees 14 2 1 4 Input Status area iior aeea A 15 2 1 5 Overall status area oo seecceeseeseestesseeseeeseesteestesnesseesnteaeesnees 16 2 2 Measure MENU aer dence nce ah dinhasioedabaan i aitendie ain 16 2 28 SPOCUUM EA EE 16 22 2 Delay TINGE anri araea dest sans aaa ATAKAE Eaa 19 Internal Delay Time ss ssssssssssssseeessrrrsssrrissssnterennreennrrresnrnensnn 20 Delay fInderaxes eneren kaaa 20 Delay finder Amplitude threshold cscessssseeetesseeeseneaeetees 20 Time Bandwidth Selection csccsccsesesseseeessesessseneenees 20 Setting the Internal Delay Time c seceecsesseesseesessesseesneesnesees 20 Notes regarding the Delay finder and measuring loudspeakers 20 Pre Eq External Delays c ceccceseecesesesesseeseeeseeteseeesneeteseseees 23 Characterizing Reflections sssscsessessesssesneesnessessesneesneeees 23 Polarity CHECKING csssccss
44. channel Menus 3 1 View Menu VIEW V 2 3 STEREO amp MULTI Room Spkr Memory Clear F6 Figure 42 View Menu Structure The View menu selects the display format for the traces Live traces and memory traces may be individually selected or viewed together 3 1 1 View Menu for Single Channel Spectrum and Feedback Find Eq Input Single channel amplitude spectrum of Eq Input Eq Output Single channel amplitude spectrum of Eq Output Microphone Single channel amplitude spectrum of Microphone 3 1 2 View Menu for Dual Channel Delay Finder and Frequency response Room speaker White Measurement of the unequalized loudspeaker room system response Eq Orange Measurement of the equalizer response Measurements of this type may be made with the loud speaker system muted if desired 1 Eq Green Measurement of the inverse of the equalizer response Measurements of this type may be made with the loudspeaker system muted View 1 Eq is not available in Delay finder 52 Note Only one of the Eq view selections Eq or 1 Eq is available at a time reSult Blue Measurement of the equalized loudspeaker room system response Group This is an amplitude and S N or Coherence display of the Room Eq and Result measurement types Memory Selects which memory traces appear on the screen Command Sequence View Memory Select Type Room speaker 1 Eq reSult Eq De
45. ctive levels To make and store Combined Systems measurements follow these steps 1 Select the Combined Systems Procedure and select or enable speakers Procedure Combined Systems Speaker Enable or Select Measure Delay Finder Set Internal Delay Time if necessary Measure Frequency response Trace Offsets are defeated When the measurement is complete you may store it using the Data Store Combined Systems command You may also recall other data i e Single System or Lobe Study while viewing Combined Systems data Data Recall recall Single System or Lobe oe 3 3 6 Mic Eq The Mic Eq Procedure provides a way to measure and correct microphone responses similar to the Procedures for speaker systems above For those who want to measure the response of a microphone in its actual environs SIM System II provides an elegant solution A typical application for this is a lavaliere mic attached to a person The SIM reference mic is placed at a conversational distance and becomes the known reference point in the measurements The signal from the lavalier mic is fed through an outboard equalizer The Eq Input and Output are monitored as usual The switching is handled in software and speakers are normally muted Reference Mic Lavalier Mic Figure 48 Reference Mic Position for Body Mic equalization 64 In order to perform these measurements in actual practice they must be carefully executed Because it
46. d to an other disk Do not attempt to save data to hard drive 4 1 3 Floppy drive dead lt FDD Failure gt No immediate action required Do not attempt to save data to floppy drive 4 1 4 BIOS battery failure lt CMOS Memory Mismatch gt The BIOS chip contains basic instructions for the computer such as disk drive configurations memory types and key board parameters The BIOS instructions are kept in CMOS memory by a lithium battery while the system is turned off If this battery fails the system will no longer be capable of booting up normally To fully remedy the problem will require battery replacement and a resetting of the BIOS In the short term the BIOS may be reprogrammed on site As an emergency backup you will find the BIOS instruction set printed on the bottom of the keyboard Follow the BIOS instructions The system will retain the BIOS settings until powered down Until the battery is replaced the BIOS will need to be reset each time the system is powered up 73 4 2 SIM 2201 BIOS Setup Accessing BIOS Setup Program 1 With the removable hard drive installed reboot the SIM 2201 by turning the power on or pressing the front panel Reset key 2 The system will begin running its POST Power On Self Test routines starting with a memory check Follow ing the memory check the system will prompt you to run the BIOS Setup Program 3 Press lt F1 gt in response to the prompt The BIOS Setup Program will run and a menu
47. dy Procedure will automatically turn off the present Branch s speaker and turn on any other speakers that were previously selected in Combined Systems or Lobe Study Select and Enable The Speaker Select menu remembers which speakers were on when the Procedure changes When multiple speak ers are selected during Combined Systems and Lobe Study the selection is maintained in memory If you select Single System one speaker only and then return to Combined Systems or Lobe Study the same speaker selection will return This is best explained by an example In this example we will assume that Branch 1 controls Speaker 1 Branch 2 controls Speaker 2 etc the default Setup 1 Select Branch 1 2 In Combined Systems Procedure select Speakers 1 4 All others should be off 3 Select Single System Procedure Speaker Enable Speaker 1 will be on all others will be muted As you step through the Branches each Branch s Speaker will turn on as the rest are muted 4 Now return to Branch 1 and select Combined Systems Speaker Enable Notice that Speakers 1 4 are now selected as they were before you entered the Single System Procedure 5 Select Lobe Study Procedure Speaker Enable Notice that Branch 1 s speaker is now off while Speakers 2 4 are still on As you step through the Branches each Branch s speaker will muted and the remaining three will be on 6 If you then select Single System Procedure and return to Lobe Study the s
48. e 65 00 ms screen N Type Result 0 4 Ampl A Delay 65 00 d Delayed N Speaker System Internal Delay Time Cursor Position Reference Delayed Speaker Speaker Delay System e 65 ms Reference Speaker Delay Figure 46a Before Setting the External Delay The Reference Speaker is Selected Step 3 57 4 Press F3 The Internal Delay Time will be set to compensate for the Reference speaker propagation delay then the SIM 2201 will select the Delayed speaker and restart the Delay finder The Delay finder display should appear as shown in Figure 46b SIM 2201 Sound Analyzer Internal Delay Delayed Speaker Impulse Response Red Red SIM 2403 Interface Network Bus Output Cable Upper Screen Bik 70 65 00 70 ms External Delay Internal Delay Time Cursor position relative to Cursor center of Measurement Microphone Data Live 35 00 ms screen Type Result 0 4 Ampl A Delay 30 00 d Delayed N Speaker j System Internal Delay Time Cursor Position Reference Delayed Speaker Speaker Delay System 30 ms e 65 ms Reference Speaker Delay Figure 46b Before Setting the External Delay F3 has been Pressed The Delay Speaker is Selected 5 Adjust the external delay line time to the same number as Delay finder readout highlighted in green in the cursor area cursor position relative to screen center labeled ms The Delay find
49. e alignment phase to mute and adjust levels carries a risk if used during a show To prevent the possibility of inadvertent speaker muting from a loss of power or software control move the System Snake on the rear of the SIM 2403 Interface Network to the Sys tem Safe position When re patching the System snake it is recommended that all amplifiers be tem porarily turned off If the speaker level controls of the SIM 2403 Interface Network have been moved from the unity gain position they must be re adjusted as follows before patching to the Safe position 1 Select Procedure Single System and Measure Frequency response 2 For each speaker system that is not already at unity e Data Store and Data Recall or F5 e Readjust speaker level on SIM 2403 Interface Network to unity fully CW e Adjust speaker system level at some point post Eq output controllers or amplifiers until the live trace over lays the stored trace When this task has been completed for all systems patch the System Snake to the System Safe position When this patch has been made the green Safe LED on the front panel of the SIM 2403 Interface Network will be il luminated The SIM 2201 could now be powered down without risk to the path of the sound reinforcement signal It is also recommended that the Source Output be unpatched from the system console Select Procedure Show 3 3 9 pOst process The Post Process Procedure enables disp
50. ect a Group to re call and press lt Enter gt The Notepad then appears allowing you to view and edit the text To exit the Notepad press lt Ctrl Enter gt 2 3 3 saVe To save the data all eight Groups in memory to disk press Data saVe If the Setup has not been saved you will be prompted for a Setup name and the Setup will be saved Next a prompt appears asking for the name to save the data as Type a name and press lt Enter gt The data is now saved to disk under the current Setup 2 3 4 Load Data loaded from disk always comes from the current Setup To load data press Data Load A menu appears listing all the data files in the current Setup directory Select a file and press lt Enter gt Shortcut Keys For faster storage and recall of data without viewing the Notepad press lt Ctrl Enter gt instead of lt Enter gt after select ing one of the eight Groups 31 2 3 5 Disk menu Select either the removable hard drive or the floppy disk to save or load data Notes on naming data files When saving data filenames must contain only the letters A Z digits 0 9 and the following characters E Filenames cannot contain spaces spaces typed into filenames are replaced by underbars _ The filename is searched for disallowed characters If any are found the message Bad characters in filename appears the offend ing characters are removed and the filename prompt re appears Before data files are s
51. ected from the SIM 2403 Interface Network All Fre quency response data are of the Result type The Measurement microphone should not be placed closer to the sound source than the Reference microphone because you will not be able to set the Internal Delay Time if the Measure ment mic signal arrives before the Reference mic signal Applications e Perform a fast diagnostic test of measurement microphones Perform measurements without the use of loudspeakers or other electrical devices An example of this is measuring the Frequency response between the stage and the audience areas of a symphonic concert hall Analyze the response of different microphones compared to a reference microphone SIM 2201 Sound Analyzer na Result EQ In Bus A internally switched Mic Bus C Mic In SIM Reference front panel Mic Mic Snake Bus Output Compare Cable Mic s Figure 52 Procedure Mic Compare Block Diagram 67 Microphone evaluation This type of Mic Compare measurement is dependent upon the quality of the Reference microphone the one plugged into the front panel Therefore it is important that only the highest quality mics be used such as the B amp K 4007 SIM Reference Microphone which is selected and matched by Briel and Kjaer for Meyer Sound The ideal Frequency re sponse between the mics would occur if the mics were capable of occupying the same position Because this is obvi ously not possible it is
52. ency response display consists only of data at frequencies whose Reference channel amplitude exceeds the Amplitude threshold If no data exceed the threshold the system will not use any data from that time record and a prompt will appear in the main status window Data lt threshold 25 Measure Frequency response screen configuration v 2 0 Lab Screen Type Upper Amplitude Avg Upper Amplitude Inst Upper S N or Coherence Lower Phase Avg Lower Phase Inst v 2 3 Stereo and v 2 3 Multi channel Signal Channels Reference Vs Measurement Reference Vs Measurement Reference Vs Measurement Reference Vs Measurement Reference Vs Measurement Colors for the different Frequency response types Color Type Blue Result White Room speaker Orange Eq Green 1 Eq Ref Vs Meas ch Eq In Vs Mic Eq Out Vs Mic Eq In Vs Eq Out Eq In Vs Eq Out Inverse v 2 3 Stereo and v 2 3 Multi channel Basic View Room speaker Eq or reSult Screen Type Upper Amplitude Avg Upper Amplitude Inst Upper S N or Coherence Lower Phase Avg Lower Phase Inst See Above See Above Signal Channels Room Eq 1 Eq or reSult Room Eq 1 Eq or reSult Room Eq 1 Eq or reSult Room Eq 1 Eq or reSult Room Eq 1 Eq or reSult v 2 3 Stereo and v 2 3 Multi channel Group View Screen Type Upper Amplitude Avg Upper Amplitude Inst Upper S N or Coherence Lower Amplitude Avg Lower Ampli
53. enever the source output is active The front and rear connec tors are hard wired in parallel 1 4 Rear Panel System Hardware 1 4 1 Power Inlet Takes universal IEC power cable 1 4 1 Mains Voltage Selector The power supply is designed to run over a wide range of line voltages The chart below shows the specified range for the two selectable settings AC Line Voltage Switch Setting 90 125 VAC 50 60 Hz 115 200 250 VAC 50 60 Hz 230 1 4 2 Power Outlet Switching courtesy outlet for video monitor 1 4 3 SVGA 15 pin D shell connector carrying video output to monitor Caution The video cable must be plugged so that the 15 pin end is connected to the SIM 2201 At tempting to connect a 9 pin VGA cable at the SVGA output may cause pins to bend Note For a detailed description of the SVGA Video Card please refer to the SVGA Video Card user s manual 1 4 4 Serial RS 232 Serial port Com 2 1 4 5 Printer Parallel port for interface with printers see Section 2 5 10 Util Print 1 4 6 Mouse Serial PC Mouse port Com 1 Note For a detailed description of the Serial Printer and Mouse ports please refer to the PTI 217 Multi I O Card user s manual v 2 3 Multi channel 1 4 7 Control D25 connector to control SIM 2403 Interface Network Note For a detailed description of the I O Driver PCB please refer to the Keithley Metrabyte P10 24 user s manual
54. enter of Data Live 0 00 ms screen Type Result 0 4 Ampl Measurement Microphone Delay 30 00 Internal Delay Time Cursor Position Delayed Speaker System Reference Delayed Speaker Speaker Delay System 30 ms j 65 ms Reference Speaker Delay Figure 47d Setting the External Delay Adjust External Delay Until Cursor Peak is Centered Note When using Procedure External Delay Pre Eq you will not be able to adjust the Internal De lay Time This would cause errors in the computation of the external delay line time The Internal De lay Time is always set to compensate for the propagation delay from the delay speaker to the mea surement microphone 63 3 3 4 Lobe Study The Lobe Study Procedure is used is to view the interaction from other speaker systems into the coverage area of the Branch being measured To make and store Lobe Study measurements follow these steps 1 Select the Lobe Study Procedure and select or enable the speakers Procedure Lobe Study Speaker En able or Select 2 Measure Delay Finder Set Internal Delay Time if necessary 3 Measure Frequency response Trace Offsets are defeated 4 When the measurement is complete you may store it using the Data Store Lobe Study command 3 3 5 Combined Systems The Combined Systems Procedure is used to add other sub systems such as delayed fill soeakers to the present Branch s coverage area and set their respe
55. er trace will move as you adjust the external delay F3 is disabled after step 4 58 When the external delay time is properly set the Delay speaker impulse response peak will be at the center 6 of the screen as shown in Figure 46c SIM 2201 Sound Analyzer Delayed Speaker Impulse Response Red Internal Delay SIM 2403 Interface Network Bus Output Cable Upper Screen Bik 70 65 00 70 ms Internal Delay Time External 35 00 ms Delay Cursor position relative to Cursor center of 0 Measurement d Microphone Data Live 0 00 ms screen N Type Result 0 4 Ampl Delay 65 00 Delayed Speaker System Internal Delay Time Cursor Position Reference Delayed Speaker Delay Speaker System 30 ms g 65 ms Reference Speaker Delay Figure 46c After Setting the External Delay The Delay Speaker Impulse Response Peak is Centered The external delay line has now been adjusted so that its speaker s sound will arrive coincident with the sound from the Reference speaker at the measurement microphone position 59 Pre Eq Delay Lines If the external delay line is patched before the system equalizer follow these steps Select the Delay Branch Set the external delay line to 0 0 ms bypassed Select Procedure Single System and Measure Delay finder The display should appear as shown in Fig ure 47a SIM 2201 Sound Analyzer
56. fault View settings Spectrum Eq Input Delay finder reSult Frequency response reSult fEedback finder Eq Input 3 2 Branch Menu SIM System II allows selection and measurement of up to 64 equalizers speakers and microphones To facilitate effi cient system management the equalizers speakers and microphones may be linked together by defining Branches The Stereo version of the SIM software accommodates two Branches and the Multi channel version accommodates sixteen The Branch menu selects a Branch for measurement When a Branch is selected the SIM 2201 and SIM 2403 auto matically select the appropriate equalizer soeaker and microphone Each Branch has three measurement points Eq Input e Eq Output Microphone From these three transfer functions are calculated Room speaker Eq and Result From Equalizer Eq In Eq Out Mic a EQ pales Room Speaker Result Figure 43 A sound system Branch Each Branch also has an associated delay time corresponding to the propagation delay between speaker and micro phone When a Branch is selected the Internal Delay Time is set to the appropriate value 53 Each Branch has a user selectable Name When data are stored and saved to disk this Name serves as the filename To be fully defined a Branch must have Example Name Left Eq and speaker address channel number and name 0 1 Mains Left Microphone address channel number and name 0 1 Mix
57. function between the Reference and Measure ment channels in the frequency domain The Hann Window of the time record has been chosen since it is optimized for random noise Data are suppressed on overload of either of the two channels Frequency response Axes The Frequency axis is a logarithmic display with 24 points octave typical and linear below 20 Hz It can be displayed as full bandwidth or in three frequency spans see Section 2 5 9 Util Zoom Amplitude Amplitude in dB vs frequency Phase Phase in degrees vs frequency Coherence Coherence in percent vs frequency dB S N Signal to noise ratio in dB vs frequency 24 po ake S N dB or ir Peers by E ELCA Sat rrr a aernionr ele EE DnE Coherence r atari find _ S N D Trace r Vertical Scale Amplitude Trace Phase Trace HE O aea m aE Figure 23 Measure Frequency response Screen Display Frequency response Cursor The amplitude and phase Cursor values are affected by interpolation and smoothing when used The S N and Coher ence traces are never interpolated or smoothed The amplitude Cursor values do not track with the Setup trace Offset The Cursor retains the actual value There fore when the Trace Offset function is used the Cursor values will appear to differ from the vertical axis values by the amount of offset applied Frequency response Amplitude threshold The default Amplitude threshold is 60 dB The Frequ
58. hannel C Input refers to the device under test input Output refers to the device under test output Mic is for microphones annan SIM 2201 Front Panel Source Input A Output B Mic C Electronic In Device Under Test Out Figure 29 v 2 0 Lab Electronic Measurement with Generator as Reference Channel SIM 2201 Front Panel Source Input A Output B Mic C Figure 30 v 2 0 Lab Acoustic Measurement with Generator as Reference Channel Select the Generator as the Reference when there is no need to use an unknown source The system should be patched as shown in Figure 29 or 30 36 SIM 2201 Front Panel Source Input A Output B Mic C E External lectronic Out Device Under Test Source n Figure 31 v 2 0 Lab Electronic Measurement with Input A as the Reference Channel SIM 2201 Front Panel Source Input A Output B Mic C g A Figure 32 v 2 0 Lab Acoustic Measurement with Input A as the Reference Channel Selecting Input A allows Source Independent Measurements using program material instead of the Generator The system should be patched as shown in Figure 31 or 32 2 4 3 Names Selects names for A B and C Channels Type the names you wish into the appropriate boxes gmi i p F E Figure 33 Setup Names Screen Display 37 v
59. hase 10 deg div 180 deg ctr 30 deg div Amplitude Threshold 60 deg div 0 deg ctr 180 deg ctr Coherence Threshold Smoothing Narrow Off 1 6 Octave f Smoothing Narrow Off 1 3 Octave ee 1 6 Octave 1 3 Octave Master Gain Master Gain 50 dB 40dB 30 dB Position Mic Gain T0 dB 10 dB 0 dB 10 dB 20 dB Autoset Delay F3 Autoset Delay F3 Apple Laserwriter Series HP DeskJet 500c Apple Laserwriter Series HP LaserJet Series II HP DeskJet 500c Other HP LaserJet Series II Other Figure 36 Util Menu Structure 42 2 5 1 3 Frequency response Vertical Scale Amplitude in dB div The amplitude traces are typically centered with unity gain at the screen center v 2 0 Lab The vertical scale is offset when the gains of the Reference and Measurement channels are different Coherence The Coherence scale shows 100 at the top of the screen and may be adjusted for full 1 2 or screen S N per Hz The signal to noise scale shows 100 dB at the top of the screen and may be adjusted for full or screen Signal to noise is calculated at maximum frequency resolution regardless of the smoothing setting Phase in degrees div The phase scale typically shows 0 degrees at the center but can be changed to 180 degrees at the center This option is available only with vector averaging Util Vertical scale
60. he Cursor value is in dBV referenced to 1V rms The Cursor follows the frequency of highest amplitude when peak tracking is enabled Spectrum Amplitude threshold The Amplitude threshold is shown as a white trace Only data at frequencies that exceed the Amplitude threshold will be allowed into the averager during Frequency response measurements Note While the Amplitude threshold line is shown in Spectrum measurements it has no effect upon them It only affects measurements displayed in Measure Frequency response MEASURE V2 0 LAB Spectrum Delay Finder Frequency Response SIM MEASURE V 2 3 STEREO amp MULTI Spectrum Delay Finder Time 70ms 140 ms 280 ms 560 ms Frequency Response SIM Feedback Find Figure 20 Measure Menu Structure 17 THD Total Harmonic Distortion THD is calculated at the Cursor frequency and displayed in the Cursor Status Area To make an accurate distortion measurement you must use a sine wave and optimize the signal to noise ratio of the system The distortion measurements are computed by analyzing the signal strength of the first nine 9 harmonics above the fundamental the Cursor position within the 22 kHz bandwidth THD is calculated when the fundamental frequency is below 10 kHz THD Example 1 Set the Generator to 1 kHz Sine or Var Sine If the Cursor does not move to the amplitude peak set
61. he time offset from the center of the screen The lower screen contains the area of the highest amplitude accuracy 5 dB There fore if accurate amplitude measurements are required make sure that Cursor is on the trace in the lower screen 19 Internal Delay Time Before accurate Frequency response measurements can be made you must compensate for any time delay between the Reference and Measurement channels This is accomplished with an internal digital delay line Delay times are selectable in increments of 20 us to a maximum of 983 04 ms Delay finder axes The center of the horizontal axis is the present Internal Delay Time This delay is applied to the Reference channel so that it can be made synchronous with the Measurement channel The horizontal values to the left and right of the cen ter represent time relative to the Internal Delay Time When the Internal Delay Time is set such that the time delay be tween the channels has been compensated the amplitude peak will be at the center of the horizontal axis The relative amplitude of the impulse response at a given time offset may be found by moving the Cursor to that time point and reading the value A ratio of 2 1 between two points on the time axis indicates a difference of 6 dB Delay finder Amplitude threshold The Amplitude threshold defaults to 40 dB If the Reference channel signal level does not exceed 40 dB relative to full scale the Delay finder will pause
62. hem against a reference mic in the near field Any sound source can be used human or a loudspeaker a speaker is easier The sound source is placed at a reference posi tion and the reference mic is placed the desired distance from it It is important that the two mics be placed so that they are both in the same axial plane of the loudspeaker to prevent the measurements from including the differences in axial response of the speaker Reference Mic Foot ney Mic Figure 50 Mic Placement for Foot Mic equalization 65 Connections should be made as shown in Figure 51 The procedure for equalizing the microphone is the same for both v 2 3 Stereo and v 2 3 Multi channel and is as follows 1 In Procedure Pretest have the subject speak If the sound source is loudspeaker run noise through it Ad just the console gain for optimum drive from the channel insert send output 2 Using the Branch Setup Panel establish a Branch with equalizer and Mic assignments that correspond to your connections Measure this Branch 3 Select mlc Eq Procedure 4 Adjust the Master gain and Mic gain so that signal levels are within 10 dB of full scale 5 Select Delay finder under the Measure menu Autoset F3 the Internal Delay Time to compensate for the propagation delay between the microphones 6 Select Frequency response under the Measure Menu and select four or eight averages with the Average Menu 7 Have the subject speak
63. inue Allows the Setup to be reset without clearing the Frequency response data array Note that if the old data remains in memory it is no longer labeled with its original Branch names 2 4 13 Default Setup The system boots up with its own default Setup This Setup is intended to provide a logical starting place so that the minimum amount of time need be spent filling out the Setup Panel There are different default Setups for the Lab Ste reo and Multi channel programs 41 2 5 Util Menu The Utilities menu contains sub menus that control the global parameters of the instrument 2 5 1 Vertical Scale Sets the vertical scale for the displays 2 5 1 1 Spectrum Vertical Scale Amplitude in dB div The amplitude scale is always referred to dB full scale O dB is at the top of the screen 2 5 1 2 Delay finder Vertical Scale Amplitude in units div 0 is always at center a value of 1 implies unity gain UTIL V2 0 LAB UTIL V 2 3 STEREO amp MULTI Vertical Scale Amplitude Spectrum amp Delay Finder Vertical Scale Amplitude Spectrum amp Delay Finder Freq Resp 1 dB div idly Freq Resp 1 div 2 dB div zdy 2 dB div Dd 6 dB div 3 div 6dB dv or 2 div 10 dB div Sdiv 10 dB div 9 diy 12 dB div 1 0 div 12 dB di 5 div 15 dB div 2 0 div is aBialy 1 0 div 20 dB div Y 2 0 div Coherence Coherence Full 1 2 S N per Hz 1 3 S N per Hz Full Phase 10 deg div i 30 deg div 60 deg div deg ctr P
64. is not possible to make these measurements while someone is walking around a stage the person must remain at a fixed distance and angle to the reference microphone and to their own body mic After the gains have been set proceed to Measure Delay finder and set the Internal Delay Time Move to Measure Frequency response Since the human voice is the generator it is necessary to coax the person into speaking for long enough for you to obtain 4 to 8 samples at each frequency in the pass band of the human voice This can take a while so be patient and bear in mind that the averag ing algorithm will hold the last valid samples received It may seem silly but by far the fastest method is to have the person either sing or simulate pink noise in various ranges While it is possible to equalize the mic as the person speaks it is usually more practical to store the Room speaker Frequency response and equalize against the memory trace After the Room speaker data has been stored enable the generator so that it flows through the equalizer for the mic channel This will expedite the equalization process Figure 49 Procedure Mic Eq Signal Flow Foot Mouse Mics A popular technique in theatrical sound design is to use ground plane microphones to unobtrusively mic large stage areas where close proximity miking is not possible The mics are placed low to floor to minimize the effect of floor re flections It is possible to equalize these mics by comparing t
65. it to peak track mode by typing lt Alt P gt 2 Adjust the Source Level Control Front Panel so that the amplitude peak approaches the top of the screen The signal input meter lower right should read close to 0 dB The gain should be adjusted internally with Util Master gain to optimize the dynamic range of the instrument and maintain a desirable drive level If the drive level of the fundamental is low the readings will contain the noise products of the analyzer itself and the environment giving an inaccurately high distortion reading 3 The distortion reading is displayed in the Cursor status area If the THD exceeds 99 gt 99 will be displayed Window The flattop window is chosen as it yields the best accuracy for sine waves Overload Status Data are rejected if the measurement inputs are overloaded Measure Spectrum screen configuration v 2 0 Lab Screen Type Color Signal Channel Upper Reference White Generator or Input Ch A Lower Measurement Yellow Output Ch B Lower Measurement Orange Mic Ch C The signal channel is selected in the Setup menu v 2 3 Stereo and v 2 3 Multi channel Screen Color Signal Channel Upper White Eq Input Upper Yellow Eq Output Upper Orange Microphone Lower Not used The signal channel is selected in the View menu 18 2 2 2 Delay finder The Delay finder computes and displays the amplitude response of the measured system in the time domain Two large FFT s are perfo
66. ite the old one Any other key will return you to the filename prompt If the file cannot be saved you will be alerted by a prompt stating No such file or directory The reasons that a file cannot be saved include Disk not present Unformatted floppy disks Disk full Write protected disk Not a High density floppy disk Bad sector s on disk Setup file size The Setup file size ranges from 1 9 to 9 8 kbyte depending upon the number of Branches used 2 4 10 Load Select the disk having the desired Setup file You will be prompted with a list of the Setup files on the disk The Up Down arrow keys will select the desired file Page Up Down keys select additional pages of files if required Press lt Enter gt to Load the desired data file The Setup will load from disk and the Branch Setup Panel will show the new Setup You may change any entries if you desire In addition the other parameters listed above will be recalled If the selected disk is not present a prompt will appear as described above in the section on Setup saVe After the Setup has been loaded a prompt will appear regarding the data array You may choose to load the data ar ray that corresponds to the newly loaded Setup as well to clear the array or to continue with the old data still present 40 Load Clear old data Clears the Frequency response data array in memory so that the next cycle of measure ments may begin with a clear array Thi
67. laying multiple memory traces As the name connotes no new data are taken All data are of the Frequency response type and are obtained from the memory array The color designation closely resembles those of the Frequency response screen 3 3 10 Quit Select Procedure Quit to exit the program Before exiting you will be prompted to save the Setup and any data to disk The Generator is turned off and all speakers are unmuted 3 3 11 Speaker Menu The Speaker Menu enables remote switching of speaker systems from the keyboard This has several advantages over manual control No additional personnel are needed at the amplifier racks to control speaker muting This saves time and greatly reduces the risk of error The control is ahead of the amp racks and crossovers allowing speaker systems to be muted from a single point This is particularly advantageous with systems having multiple speakers and amplifiers fed from a single equalizer as such systems can otherwise require entire banks of amplifiers be switched off and on The SIM 2201 Sound Analyzer tracks the speaker system status This allows the speaker control function to work in conjunction with the Procedure Menu to assure measurement of the proper speaker combinations Additionally information about which speakers are on is attached to measurement data which is stored and saved to disk and is displayed on the screen for both live and memory data 69 Because muting occ
68. n an incorrect setting of the Internal Delay Time At any rate it is inadvisable to attempt to align the system from such a microphone position since the loudspeaker system may be driven into instability With speaker systems that lack optimum phase alignment it may be necessary to set the Internal Delay Time to val ues other than the time offset of the peak with greatest amplitude The Internal Delay Time should be set to align to 20 SIM 2201 Sound Analyzer Cursor on Direct sound Source Internal Delay Upper Speaker Measurement Screen System Microphone 70 70 ms Internal Delay Time Cursor position relative to Cursor center of J som i Data Live 30 00 ms Propagation Delay Type Result 0 4 Ampl ba Delay 30 00 Propagation Delay Internal Delay Time Cursor Position Figure 22a Before Setting the Internal Delay Propagation Delay Produces 30 ms Time Offset Between Ref erence A and Measurement C Channels SIM 2201 Sound Analyzer Direct sound Echo Source Internal Delay EQ In A Upper Speaker Measurement screen System Microphone 70 30 00 70 ms Internal Delay Time Cursor position relative to 30 ms Cursor center of 3 Data Live 0 00 ms screen Propagation Delay Type Result 0 4 Ampl Delay 30 00 Propagation Delay Internal Delay Time Cursor Position Figure 22b After Setting the Internal Delay Pressing F3 Sets
69. ne of these channels will cause the Frequency response traces to move up or down The vertical scale will be redrawn to reflect the offset in gain The gain for each channel can be set by first viewing the levels of the incoming data as displayed in the Input Status Area on the screen or the front panel meters and adjusted so that the input level is within 10 dB of full scale Precise control of the trace position is effected using Setup trace Offset in the Setup Panel 2 5 5 Position Mic Gain v 2 3 Stereo and Multi channel only The Position menu controls the gain of the mic channel only It is used during Setup as a coarse vertical positioning control to compensate for the acoustical gain of the loudspeaker system at each microphone point Fine control of the trace position is effected using the Setup trace Offset By setting the Mic channel gain separately from the Eq In and Out gain one can compensate for the relative gain of the Speaker Mic system Changes in the mic gain will cause the amplitude response traces of the Room speaker and the Result Types to move up or down Since a change in mic gain causes a change in the position of the trace on the screen it is advisable to find a single setting that best suits the average gain level of the different Branches Other wise it can become difficult to keep track of the actual gain relationships between sub systems The Position can be set by viewing the input levels of the incoming data
70. nnot guarantee compatibility with all printer models 2 0 6 Signing In When the program is finished loading you will be prompted to update the system time and date Press lt Enter gt to ac cept the present settings or enter new settings and press lt Enter gt The screen will then display a series of sign in prompts Here you will enter labels that will be saved with the data Notepad and will be stored along with data that you save to disk in v 2 3 2 0 7 The SIM System II Menus The SIM Software user interface is both logical and intuitive At the top of the display is the Menu Bar comprising the main system menus These are selected by typing the first letter highlighted in red of each menu When the letter is typed the menu will open to display the available sub menu choices Throughout this manual menu choices are shown in bold face type The highlighted red character in the program is denoted with an underline The main menu choice always appears first followed by a colon followed by the sub menu choices Example Measure Delay finder refers to the Main menu item Measure which is selected by the letter M Its sub menu item Delay finder is selected by the letter D and selected with lt Enter gt The command consists of M D lt Enter gt Once a Main menu is open adjacent menus may be selected with the left right arrow keys The sub menus can be selected by using either the highlighted letter
71. nu Structure The Setup menu customizes the SIM 2201 Sound Analyzer to conform to the system under test All Setup data can be saved to disk and reloaded allowing speedy restoration of the instrument state Within the Setup Panels the keyboard functions are as follows Right Left arrow s es Move within field Up DOWN arrow nssssssisssssseessessrsssesnessres Move to field above and below Ctrl L R Arrow cccceeeeeteeeeeeeeeeteeeeeees Move to beginning of next previous word BaACKSPaCE aaaea taia ERAEN Delete previous character DEL wie ire aie eae Delete current character OMG ornan eee eve these EE OTA Move to first character in field END rriei iinei aeai Move to last character in field NS aee ee eaten esemiietnatea Toggle insert mode TAB ariana Gene ee ee Move to next field ESC iae a a aa are a te atenat Restore field to last value before edit ENTER ceanna oap aA Accept entry and move to next field CTRL ENTER csceeeeeeeeeceeeeeneeeeeees Exit from panel 35 v 2 0 Lab 2 4 1 Reference channel The Reference channel can be set to Input A or Generator 2 4 2 Measurement channel The Measurement Channel can be set to Output B or Mic C Selecting Output B sets the system to measure a line level electronic device Instrumentation microphones that are preamplified may also be patched to Channel B Selecting Mic C sets the system to measure with a microphone or mic level device Channel A Channel B C
72. of options will appear 4 Press lt ENTER gt to select the first option Standard CMOS Setup Navigating and Selecting Values The keys used to navigate within the Setup Program and select values are ESC Exit to previous screen Arrow keys Move Cursor to desired location PG UP PG DN Select the values for the highlighted item PG UP decrements the value in the case of numerical values like the time of day and PG DN increments it F1 Display help screen for the highlighted item F5 Retrieves the value that the highlighted item was set to at the start of the editing session F10 Saves all changes and exits the BIOS Setup Program Standard CMOS Setup Values 1 Press any key in response to the initial warning prompt The system BIOS will show these values Base Mem 640 kB Ext Memory 15104 kB or 15360 kB 7808 kB for machines with serial numbers below D92001 1 2 Where necessary edit the values shown in the Standard CMOS Setup display to be as shown below Hard disk C type User Type Cyln Head WPcom LZone Sect Size 47 1024 6 0 1024 38 114MB You will have to type in the above values manually Hard disk D type Not Installed Floppy drive A 1 44 MB 3 12 Floppy drive B Not Installed Primary Display VGA PGA EGA Keyboard Installed 3 Press lt ESC gt to return to the main menu page Use the down arrow key to select Advanced CMOS Setup then press lt ENTER gt Advanced CMOS Setup Values
73. onsole 2 To Amp 1 To Amp 2 EQ Out 1 EQ Out 2 EQ In 1 EQ In 2 Spare kevesen perese gt gt comaenzenf nazas Buss Extender Pinout Chart Pin 3 Color Pin 2 Color Pin 2 Red 3 2 1 Eq In Buss White 6 5 4 Eq Out Buss Green 9 8 7 Mic Buss Blue Yellow Brown 83 Red HH JJ Console 1 White Console 2 Green Console 3 Blue Console 4 Yellow Console 5 Brown Console 6 Orange Console 7 White Console 8 Green To Amp 1 Blue To Amp 2 Yellow To Amp 3 Brown To Amp 4 Orange i j To Amp 5 White To Amp 6 Blue To Amp 7 Yellow To Amp 8 2 3 4 5 6 7 8 9 1 1 1 1 1 1 1 ouhAanh _o Red EQ In 1 White EQ In 2 Green EQ In3 Blue EQ In 4 Yellow EQ In5 Brown EQ In6 Orange EQ In 7 White EQ In 8 Green EQ Out 1 Blue EQ Out 2 Yellow EQ Out 3 Brown EQ Out 4 Orange EQ Out 5 White EQ Out 6 Blue EQ Out 7 Yellow EQ Out 8 aaa MaMa M OOND OnhWN A0 ea rer 3 vuna o7tn EnNn7 E5SDACKX lt S OnNngD AxXx ZT C ISO Input Channels A and B Signal Source Wiring of SIM 2201 Input Configuration Pin 1 Pin 2 Pin 3 Polarity Comments Transformer or Best CMRR Push Pull Drive lowest hum Single ended Best Drive performance C C C C Key C n c Signal high n c C i Signal low C n c C Common C n c n c No connection Figure 59 ISO Input Connection Truth Table E gt oY 5k1 5k1 PIH H Shell Chassis Earth Figure 60 ISO Inpu
74. oot up time from floppy is dependent upon whether or not the hard drive is installed Boot up from floppy with hard disk installed 1 minute Boot up from floppy w o hard disk installed 2 minutes Note The Video monitor must be connected before the system is powered up If not the display will display black and white only To correct this the system must be reset 2 0 4 Boot up of Software other than SIM 1 Insert a bootable disk into the floppy drive or insert a separate portable hard drive with the desired program 2 Turn the SIM 2201 Sound Analyzer on Caution Bootable floppies other than the SIM Software may corrupt the SIM Software on the hard disk If other programs are used it is advised that the SIM Software hard disk not be inserted When you wish to return to the SIM System I Program power down and follow the boot up Procedure as outlined in Section 2 0 2 2 0 5 Beginning the Program The function keys select the various SIM Software versions and Utilities F1 2 0 Lab For single or dual channel measurements of individual components or networks All input connections are made on the analyzer front panel This program is used for stand alone measurements and research F2 2 3 Stereo This program is used for analysis and alignment of recording studios or stereo sound reinforcement systems It uses the Stereo Snake connected to the rear panel of the SIM 2201 Sound Analyzer for access
75. output calibration distortion analysis polarity checking initial equalization and gain adjustments of individual speaker subsystems External Delay Alignment of delay lines to synchronize speaker subsystems Lobe Study Examination of the relative isolation between speaker subsystems Combined Systems Gain adjustment and equalization of combinations of speaker subsystems Mic Eq equalization of individual microphones to be used in performance mic Compare Analysis of individual microphones versus a known reference mic Show Measurement and adjustment of the system during performance pOst process Examination and printing of previously collected data Quit Unmutes speakers saves Setup and exits program 55 The Procedure menu sets global parameters to help guide the process It does not however enforce a rigid protocol Parameters are set primarily to alleviate the burden of having to design each set of measurements from scratch An orderly categorization of data is effected so that tedious note taking is not required The Speaker menu available from the Procedure menu controls and keeps track of what speaker s are on The Procedure menu affects Speaker control muting Internal Delay Time Measure menu Setup trace Offset Generator Source Data Store and Data Recall Note It is impossible to fully describe the Procedure menu outside of the context
76. own 10 dB Util Gain B Up Down 10 dB Util Gain C Up Down 10 dB Averaging Restart Disable enable input toggle Generator Off Moves cursor 1 bin L or R disables peak track Moves cursor 24 bins L or R disables peak track Moves cursor to next previous trace Cursor Peak track 88 v 2 3 Stereo v 2 3 Multi channel Branch lt Alt gt or N lt Alt gt Data F5 F6 F10 Setup 0r Util F3 lt Ctrl gt F3 lt Ctrl gt Page Up lt Ctrl gt Page Dn lt Shift gt gt lt Shift gt lt lt Shift gt F1 F2 lt Shift gt F5 F6 Averages R Space Bar Generator F1 Cursor L R arrow keys lt Ctrl gt L R Up Dn arrow keys lt Alt gt P Branch Next Branch Previous Freeze Frequency response trace and place in memory buffer Data Clear Hides Live or Memory Traces Toggle Setup trace Offset up 1 dB Setup trace Offset down 1 dB Util Autoset branch delay Util Autoset branch delay sets to 70 ms Util Zoom Next Util Zoom Previous Util Smooth Next Util Smooth Previous Util Master gain Up Down 10 dB Util Position Mic Gain Up Down 10 dB Averaging Restart Disable enable input toggle Generator Off Moves cursor 1 bin L or R disables peak track Moves cursor 24 bins L or R disables peak track Moves cursor to next previous trace Resume peak track 89 Y Uff Meyer li Sound Sound engineering for the art and science of sound Meye
77. place the Power Supply Take care to insure that cables are connected to DC Conveter PCB e Fans 2 Hard drive Floppy Drive Tie wrap cables as before 77 4 3 8 DC Converter PCB Remove screws from DC Converter PCB Remove input and output cabling from PCB Replace and reconnect 4 3 9 Floppy drive Remove top cover 8 screws Remove power and signal connections from the hard and floppy drives Note orienta tion of signal connecors Remove 4 screws from the bottom panel that hold the drive bay Lift drive bay and remove Unscrew drive bracket 8 screws and remove Replace and reconnect 4 3 10 Hard Drive Receptacle Same as floppy drive above 4 3 11 Hard drive Cartridge Remove and replace 4 4 Rear panel service 1 Remove top cover 2 Remove power supply screws 4 3 Remove rear panel screws 4 Fold down panel 4 5 Front panel service Remove top cover Front panel screws on chassis side and bottom 5 Disconnect front panel cabling Fold down panel Pay 4 6 Factory service required The user serviceable failures are limited primarily to the replacement of computer PCB s Any failures in the audio sig nal path will require the system to be returnde to the factory for recalibration This would include 1 Audio channel failure 2 Excess noise or distortion 3 Switching routing errors 78 Section 5 Appendices A Connection Diagrams System Phones Input Le
78. quency response and in all ver sions for Delay finder Type Selects averaging type Vector Selects Vector Averaging which affords the best rejection of contaminated data It requires an ab solutely stable time relationship between channels and works well for indoor applications Rms Selects RMS Power Averaging which affords less rejection of contaminated data RMS averaging is more tolerant of time variance between channels It is preferable for outdoor applications or when speakers or mics are moving slightly Coherence blanking is disabled Default Average settings e Average num type Measure Spectrum 1 RMS e Average num type Measure Delay finder Accum Vector e Average num type Measure Frequency response 4 Vector e Average num type Measure fEedback finder Peak hold e Average num type Procedure External Delay 2 Vector Note In v 2 3 Stereo and Multi channel you may have a different number of averages for Room and Result types than for Eq and 1 Eq types This allows more averages for acoustical measurements in reverberant environments better noise rejection and fewer for equalizer measurements greater speed 48 2 7 Cursor CURSOR V2 0 LAB Peak Track Alt P Figure 39 Cursor Menu Structure The Cursor appears as an X on the display and can be placed on any of the traces The description of that trace will then be found in the Cursor Sta
79. r Sine Noise Pulse Off 1 kHz Sine Var Sine Noise Pulse Off 1 kHz Sine Var Sine Noise Pulse Off 1 kHz Sine Var Sine Noise Pulse Offt Offt 72 Section 4 Service In the event that a malfunction occurs in the SIM hardware call Meyer Sound as soon as possible The system is cov ered by a limited one year warranty Failure types There are three types of failure modes Non fatal hardware failure modes that may be circumvented temporarily in the field Fatal hardware failure modes that are user serviceable Fatal hardware failure modes that require factory service and calibration 4 1 Non fatal failures 4 1 1 Power supply surge protection The power supply contains current surge protection circuits designed to limit in rush current It is possible that during turn on this circuit will engage The system will appear to be totally dead al though anything plugged onto the courtesy outlet such as the monitor may function normally This is most likely to occur in the event of an immediate re powering after shut down If this should occur simply wait at least fifteen sec onds and try again The system should power up normally 4 1 2 Hard drive dead or missing lt HDD Failure gt Power down Remove hard drive cartridge Insert floppy disk of the program that you wish to run and reboot Bootup will take approximately two minutes The floppy disk may be removed after boot up so that data can be save
80. r Sound Laboratories Inc 2832 San Pablo Avenue Berkeley CA 94702 510 486 1166 FAX 510 486 8356
81. r post processing and analysis in math programs or other applications The resulting ASCII data table is tab delimited and includes real and imaginary parts coherence and data validity flags for each frequency bin A sample ASCII data file may be found in the Appendix 2 3 10 Panel Pressing Data Panel displays a table of all the stored data in all the Branches labeled with name Group number and the first 10 characters of the Notepad In v 2 3 Stereo and Multi channel each Group s Procedure name also ap pears 32 He oT ee mu AREH Thre of Figure 27 v 2 3 Multi channel Data Panel Screen Display 2 3 11 Notepad Whenever data are stored or recalled a Notepad appears allowing three lines of text to be entered annotating the data In addition the Notepad displays the following Branch number Group number Procedure in which data was stored Microphone name Speaker status which speakers were on Averaging type and number Amplitude threshold Coherence threshold Time and date that the data was stored Internal Delay Time Venue Artist Engineer s name All of these Notepad items stay with the data when it is saved to and loaded from disk The Notepad may be skipped when storing and recalling data see lt Ctrl Enter gt shortcut key above 33 v 2 3 Stereo and Multi channel 2 3 12 Viewing Memory Data Data recalled from memory will normally match the type being viewed For example if you are vie
82. relative to the present settings For example selecting 10 dB will increase the gains of channels A B and C by 10 dB v 2 3 Stereo v 2 3 Multi channel The Master Gain Menu selections refer to the actual gain settings of the Eq and Mic channels They are listed in separate columns For example selecting 10 dB on the Eq channels will set the gain of the Eq channels to 10 dB The gain of the Mic channel will maintain its relationship with the Eq channel 43 Setting Master Gain The gain for each channel can be set by first viewing the levels of the incoming data as displayed in the Input Status Area on the screen or the front panel meters and adjusted so that the input level is within 10 dB of full scale input drive If the gain is too high an overload will be indicated and the data will be rejected If the gain is too low the input level will read consistently lower than 10 dB FS full scale and the effect of the Amplitude threshold will cause data acquisition to be slowed For signals with wide dynamic range bear in mind that an occasional overload is tolerable as data are rejected Shortcut Keys v 2 0 Lab No shortcut key for master gain lt Shift gt F1 F6 may be used to set individual gains v 2 3 Stereo v 2 3 Multi channel lt Shift gt F1 F2 move master gain up down 10 dB 2 5 4 Gain A B or C v 2 0 Lab only Controls the gain of the selected channel only in 10 dB increments Changes in gain of any o
83. require the removal of the other DSP boards as well Be careful not to bend the pins Remove screw on bracket card Set the replacement DSP card address according to Figure 56 then install it Ensure proper connection of the ribbon cables Room Slot 2 Eq Slot 3 Result Slot 4 Addr 280 Hex Addr 320 Hex Addr 340 Hex A switch depressed Figure 54 Setting the Addresses of DSP cards for the SIM 2201 4 3 5 Motherboard Remove all PC bus cards as above Remove motherboard power supply connections Remove battery connection Use a needlenose pliers or flathead screwdriver to unlock the plastic fasteners and ease the motherboard over each fastener It is easiest to work your way up from the rear Remove the SIMM s see below and move them to the new motherboard Place board into conductive plastic bag Install new motherboard 4 3 6 SIMMs Single In line Memory Modules There are 4 SIMMs each containing 4 Mbytes of memory Remove by unlocking the both of the clips and sliding out It is necessary to remove them in order from last to first and insert them in the reverse order 4 3 7 Power Supply Remove screws 4 from rear panel and fold down Note the two plastic fasteners that hold the bottom of the Power Supply Unscrew the power supply from the rear panel 4 Screws Clip away wire tie on power supply output cables and disconnect Each of the cables are indentical therefore it is not important to keep track of their routing Re
84. rmed in transfer function mode Reference vs Measurement channel A half Hann window is ap plied to the frequency data and an inverse Fourier Transform IFT is then taken This yields a calculation of the im pulse response which resembles the response that would be seen if an ideal pulse were applied to the system input and the system output were viewed on an oscilloscope SIM System II utilizes an advanced implementation of the IFT that prevents the phantom echoes or wrap around artifacts of conventional sampling algorithms The Delay finder is useful for identifying time offset between the reference and measurement channels timing and relative level of echo structures time domain characteristics of filters and circuits polarity Because sine waves cannot be used for time domain measurements the generator waveform will automatically be set to noise The upper screen displays the relative amplitude versus time at the selected Time Bandwidth The lower screen displays the same data with a 10x magnified time axis Upper Screen Lower Screen Upper screen magnified x10 ERTE Mieri Miabi Figure 21 Measure Delay Finder Screen Display Note The display in the upper screen may contain an amplitude response error due to sampling that varies dependent upon the data spectral density and type This may cause the amplitude to ap pear lower than its actual value The margin of error is proportional to t
85. rom top of card cage 4 screws Remove screws 4 from rear panel and fold down Note the two plastic fasteners that hold the bottom of the Power Supply The SVGA card is located in slot 6 of the motherboard PCB Remove SVGA connector from rear bracket 2 screws Remove screw on bracket card Replace the SVGA card 4 3 2 IDE Disk controller Remove hold down bracket from top of card cage 4 screws Remove screws 4 from rear panel and fold down Note the two plastic fasteners that hold the bottom of the Power Supply The IDE card is located in slot 7 of the motherboard PCB Remove serial and mouse port connectors from rear bracket 4 screws Remove floppy hard drive drive LED indicator connectors from component side Remove screw on bracket Replace the IDE card 76 4 3 3 I O Card Remove hold down bracket from top of card cage 4 screws Remove screws 4 from rear panel and fold down Note the two plastic fasteners that hold the bottom of the Power Supply The I O card is located in slot 8 of the motherboard PCB Remove D25 connector from rear bracket 2 screws Remove screw on bracket card Replace the I O card 4 3 4 DSP Card Remove hold down bracket from top of card cage 4 screws The DSP cards are located in slots 2 3 and 4 of the motherboard PCB Remove the ribbon connector from that connects to the Delay PCB Slot 5 The ribbon connectors are specific lengths to prevent connection errors To remove the card from slot 4 will
86. s has no effect upon data that have been saved previously to disk Load Load all data Loads the Frequency response data from disk for all Branches using the present Branch names as filenames Load cOntinue Allows the Setup to be reset without clearing the Frequency response data array Note that if the old data remain in memory they are no longer labeled with their original Branch names 2 4 11 dElete Deletes the Setup file from the directory If there are data files present a prompt will appear asking Delete X Branches in Setup lt Setup filename gt Yes No X is the number of data files to be deleted If Yes is selected the Setup file and its data will be deleted If No is se lected the Setup file will not be deleted 2 4 12 New This command resets the Setup Panel to the default setting Names are cleared Internal Delay Time s set to 0 ms e Trace Offset s set to 0 dB Compare Branch numbers reset to default settings Utility and Average parameters such as Gain and Smoothing are not affected by this command After the Setup has been cleared a prompt will appear regarding the data array You may choose to clear out the data array as well or to continue with the old data still present 2 4 12 1 New Clear old data Clears the Frequency response data in memory so that the next cycle of measurements may begin with a clear array This has no effect upon data that have been saved to disk 2 4 12 2 New cOnt
87. s off the Generator Once the Generator has been turned off you must select one of the Genera tor functions below to reactivate it 2 8 2 Noise Pressing Noise selects pink random noise with equal energy per octave It is primarily used for Frequency response and Delay finder measurements 2 8 3 Pulse Pressing Pulse selects a pink filtered pulse at an average rate of 1 1 Hz The interval ranges randomly from 0 9 to 1 3 Hz 2 8 4 1 kHz Sine Pressing Sine selects a 1 kHz sine wave for distortion and gain structure testing 2 8 5 Variable sine Variable sine is used for selectable sine frequencies and sweeps Two frequency ranges are available High and Low The Sine Freq control is located on the front panel 50 2 9 Help 2 9 1 Setup Describes keyboard functions for the Setup panels 2 9 2 Keys Furnishes a complete list of the Shortcut keys 2 9 3 Names Shows the acceptable characters for filenames 2 9 4 Info Gives version numbers of the software in use v 2 3 Stereo v 2 3 Multi channel 2 9 5 Procedure Provides a brief guide to the Procedures menu Note The Help menu text is maintained on the system disk as a separate file If the program has booted from a SIM Software bootable floppy that floppy must remain in the drive to access the help files HELP V2 0 LAB HELP V2 3 STEREO amp MULTI Procedures Figure 41 Help Menu Structure 51 Section 3 Stereo and Multi
88. s or the up down arrow keys The presently selected sub menu is always shown with a dark gray background To select the current sub menu sim ply press the lt Enter gt key You may also cancel without changing any settings by pressing lt Esc gt at any time For more information use the Help Menu Keys selection Procedure Measure View Branch Data Setup Util Averages Generator Help No menus have been selected Procedure Measure View Branch Data Setup Util Averages Generator Help Spectrum Delay finder Frequency response fEedback finder The Measure menu has been selected using the M key The current selection Frequency response is highlighted Procedure Measure View Branch Data Util Generator Setup Averages Spectrum Time Delay finder 70 ms Frequency response 140 ms fEedback finder 280 ms 560 ms The Delay finder menu has been selected using the D key Pressing lt Enter gt to accept the selection has caused the Delay Time sub menu to appear The current selection 70 ms is highlighted Figure 4 Pull Down Menus 10 System Time Menu Bar and Date DN waa alis Measurement Average Generator Type x Software Number and Status Version Type Amplitude Upper Display 1 Threshold M gsurement De p Horizontal Lower Display Measurement Type 4 Channel 5 Names tity Lei MS tat G lE Ehe i z i n j Data a Cursor Status St
89. scsscssssessessessnssseesessccsesseeseeaneeseeseeseesnensees 23 2 2 3 FEQUENCY FOSPONSE ahanda ehre er 24 Frequency response CUISOM cesceecsesseecstecsteeseestessteeeteeseeseeeeeees 25 2 2 ATECADACK TINGE maineira a 27 23 Data Menu ts aaa AAAA E nian AA 30 AINSOO a raina ra a AAE 30 PAREA ACCA EERTE AN E 31 p e E L E EEE A A A 31 PAR Ro o E o E tise detinatietee 31 Shortcut KEYS inpren nnair aht an 31 23 5 DISK MONU Siiri ia aanraai anaa aidait tn 32 Notes on naming ata TES ce ceseesesesseesteetesneeseeseenteateeteetenneens 32 A eins secs sess bc dees Ses ansssisssi itsn Sansvsv ans biasta ctaysvatiaucttatvasstateanes 32 2 977 SAVE All acute neat Atte alana dthiel din ata A 32 223 8 LOGO Al sage credesesi tides anssaleergrettapreaaieanteen decane 32 2 39 SAVO ASCI is setae EA 32 2 910 PANG see Sees rete tettear Sera rece A ee eet rans eee te 32 2S ANOLE DAM aerer E S 33 2 3 12 Viewing Memory Datta csccceccsessescesessesteecesesesneeeeseenees 34 23 13 Memory Irackie henaa 34 OOMV EG CEAPA EEA AEE A T AT 34 Branch Compal E n niniin a A aE OTA 34 Additional notes for v 2 3 Stereo and Multi channel 34 2 3 14 Related Commands and Shortcut Keys s s 34 EALE e PAE AE E A N A T 34 F6 Cleat rees a A a AG 34 F10 Live Memory Display Toggle s es 34 2 4 SOUP MENU Maranon cane aaa 35 2 4 1 Reference channel c ccsesesessesseseseseeseeeeeeeeeeeeeeeeeees 36 2 4 2 Measurement CHANNEL isernia 3
90. set Switch A membrane switch that resets the system 1 2 3 Power LED This green LED lights when the system is powered 1 2 4 Drive LED This LED lights when the hard drive is reading or writing 1 2 5 Floppy Drive The drive accepts standard 3 5 1 44 Mbyte floppy disks 1 2 6 Removable Hard Drive This removable cartridge contains a 120 Mbyte IDE auto parking hard drive The cartridge may be removed when the system is to be shipped The cartridge should not be removed or inserted while the system is powered up Switched Auxiliary AC Power Outlet Mains Voltage Selector Switch Source N o PER z SM SOURCE INDEPENDENT MEASUREMENT SIM 2201 SOUND ANALYZER SIM 2403 Control or Output Power Supply Cooling Fan Control Port v 2 3 only AC Power Inlet Mouse Port SVGA Video Port Printer Port Serial Port Figure 3 SIM 2201 Rear Panel Controls and Connectors 1 3 Rear Panel Audio Hardware 1 3 1 Bus Input A 39 pin Multi connector which carries audio signals to the SIM 2201 Sound Analyzer v 2 0 Lab Not used v 2 3 Stereo The Stereo Snake is connected here v 2 3 Multi channel The Bus Output Cable from the SIM 2403 Interface Network is connected here 1 3 2 Source Output A male XLR with 300 ohm balanced source impedance A green LED located next to the Source Output front panel connector is illuminated wh
91. sponse Status Area Internal Delay Time in ms Coherence threshold in percent Effective bandwidth of passband filter Window function applied to time record 14 2 1 4 Input status area The input status area at the lower right displays information about incoming signal levels gains and channel names Reference Measurement Gain A B C dB FS Speaker Gain In Out Mic dB FS Eq Speaker Microphone Gain In Out Mic dB FS Reference Measurement Gain dB FS in 20 3 2 JA out 10 6 7 1B mic 30 _ C Figure 15 v 2 0 Lab Input Status Area Reference channel name Generator or A Measurement channel name B or C Gain 20 to 50 dB of each channel Signal levels of each channel referenced to full scale in dB EQ SPEAKER chn Name Gain dB FS in 20 3 2 out 20 3 6 mic 30 6 7 Figure 16 v 2 3 Stereo Input Status Area Channel number and name for speaker Gain 20 to 50 dB of each channel Signal levels of each channel referenced to full scale in dB EQ SPEAKER MICROPHONE adr chn Name adr chn Name o msc o Gain dB FS in 20 3 2 out 20 3 6 mic 30 6 7 Figure 17 v 2 3 Multi Channel Input Status Area Address and Channel number of Eq Name for speaker Address channel number and name for microphone Gain 20 to 50 dB of each channel Signal levels of each channel referenced to full scale in dB 15 2 1 5 Overall status area The Overall
92. stem Speaker En able 56 2 Measure Delay Finder Set the Internal Delay Time 3 Measure Frequency response 4 When the measurement is complete you may store it in memory using the Data Store Single System com mand 3 3 3 External Delay The External Delay Procedure is used to set an external delay line for the Branch being measured The external delay line may be connected before or after the equalizer the alignment sequence is different in each case Delay finder is automatically selected during this Procedure Definitions Delay Branch The Branch that owns the Delay speaker and equalizer into which the External Delay Line is patched Reference Speaker The speaker to which the Delay speaker is to be synchronized Post Eq Delay Lines If the external delay line is patched after the system equalizer follow these steps 1 Select the Delay Branch 2 Set the external delay line to 0 0 ms bypassed 3 Select Procedure External Delay select Post Eq and select a Reference speaker Press lt Enter gt The Delay finder display should appear as shown in Figure 46a SIM 2201 Sound Analyzer Reference Speaker Impulse Response Internal Delay EQ In Bus Output Cable Upper IFT Screen 70 0 00 70 ms External Delay Internal Delay Time Cursor position relative to 0 Measurement l Cursor Z center of d Microphone Data Liv
93. t Load BIOS Setup Default Values from ROM Table Y N by pressing lt N gt and lt EN TER gt 2 Press lt ESC gt to return to the main menu page Use the down arrow key to select Auto Configuration with Power On Defaults then press lt ENTER gt Auto Configuration with Power On Defaults 1 Answer the prompt Load Power On Default Values from ROM Table Y N by pressing lt N gt and lt ENTER gt 2 Press lt ESC gt to return to the main menu page Saving the Changes 1 Use the down arrow key to select Write to CMOS and Exit then press lt ENTER gt 2 Answer the prompt Write to CMOS and Exit Y N by pressing lt Y gt and lt ENTER gt The BIOS is now configured The SIM software will run from the removeable hard drive Note that until the backup battery is replaced you will have to reconfigure the BIOS after each time that you turn the SIM 2201 off Pressing the front panel reset key will not affect the BIOS however 75 4 3 User Serviceable All user serviceable repairs require the removal of the top cover 8 screws 1 Not used 2 Room DSP V2 3 Only 3 EQ DSP V2 3 Only 4 Result DSP 5 Delay 6 SVGA 7 IDE Disk Controller 8 Metrabyte I O Multi channel only Mic Phantom Power DC DC Converter A D PCB Internal Switcher PCB Oscillator PCB i rive Meter PCB Bay Figure 53 SIM 2201 PCB layout 4 3 1 SVGA Remove hold down bracket f
94. t Circuit Configuration patented 85 D ASCII Data File Example Data Save Ascii saves to disk a file containing the current measurement data in Ascii format This allows porting SIM System I measurement data into other programs for post analysis Below is an example of an Ascii data file including header and data for one Group ASCII 101 format 1 Branch number Left Branch name Venue Engineer s name Artist Mon Mar 15 14 01 47 1993 date time 0 00 Branch delay in ms 0 00 trace offset in dB 60 transfer function Amplitude threshold in dB 4 number of room result averages 0 Group number 0 7 1 data flag 0 no data 1 data in this Group 2 Procedure number 2 single sys 0 Branch Eq address 1 speakers on 0 Branch mic address 1 Branch mic channel 4 Group number of room result averages 0 Group average type 0 vector 1 RMS 1 Group avg sum type 0 none 1 cycle 2 accumulate 60 Group tranfer function Amplitude threshold dB 60 Group Coherence threshold 732222051 Group time date code 0 00 Group delay time 0 00 Group trace offset in dB Room Frequency Valid Real Imag Valid Coher 7 629395 1 8 300267e 001 5 306641 e 001 1 8 83681 5e 001 9 155273 1 1 866838e 001 9 649961e 001 1 9 898558e 001 10 68115 1 2 940286e 001 8 383676e 001 1 9 881984e 001 12 20703 1 5 385644e 001 7 546250e 001 1 9 863895e 001 13 73291 1 7 8601 23 e 001 7 340807e 001 1 8 880601 e 001 15 25879 0 0 000000e 000 0 000000e 000 1
95. to the In put A and Output B channels A single microphone is patched into the front panel Microphone input C F3 2 3 Multi channel This program is used for analysis and alignment of complex sound reinforcement systems It uses the SIM 2403 Interface Network plugged into the rear panel of the SIM 2201 Sound Analyzer to access eight equalizer input and output channels and eight microphones The system can expanded to include up to eight SIM 2403 Interface Networks for a maximum of sixty four equalizer channels and microphones v 2 3 Stereo and v 2 3 Multi channel utilize three DSP engines for parallel processing to achieve a three fold im provement in data acquisition speed over v 2 0 Lab F9 Utilities This program is used for computer related utility functions A sub menu will appear with the following selections F1 Install This is used for installing new releases of the SIM Software from floppy disks onto the hard disk Fol low the instructions to install each of the programs F2 Format disk Follow the instructions to format blank 1 44 Mbyte high density 3 5 inch floppies F3 Select a SIM Printer This utility contains a library of 128 printer drivers including both color and black and white printers Follow the instructions to install the printer driver for your printer The selected printer will appear as the Other printer in the Util Print menu Many of the drivers have not been tested and Meyer Sound ca
96. tude Inst Lower S N or Coherence Lower Amplitude Avg Lower Amplitude Avg Lower Amplitude Inst Lower S N or Coherence Color Blue Yellow Red White Yellow Red Orange Green Yellow Red Bright colors are used for all primary Live traces Muted colors are used for all secondary Memory traces Signal Channels Result Result Result Room Room Room Eq 1 Eq Eq or 1 Eq Eq or 1 Eq 26 2 2 4 fEedback finder v 2 0 Lab Not used v 2 3 Stereo and v 2 3 Multi channel Feedback finder is similar to Spectrum with the addition of a peak hold function It is used to identify feedback frequencies when equalizing sound systems The highest amplitude value at each frequency is held until the Average Restart command is given fre irun Forlag finder Partie reap In Out or Mic Not Used Figure 24 Measure Feedback Find Screen Display 27 2 2 5 Default Measure settings Measure Spectrum Vertical Scale Horizontal Scale Amplitude threshold Window Cursor Master Gain Averages Measure Delay finder Vertical Scale Horizontal Scale Internal Delay Time Amplitude threshold Window Cursor Master Gain Averages Measure Frequency response Vertical Scale Horizontal Scale Amplitude threshold Window Cursor Master Gain Averages 2 2 5 4 Measure fEedback finder Vertical Scale Horizontal Scale Amplitude threshold Window Cursor Master Gain Averages 15 dB
97. tus Area Type Room speaker Eq Result Eq In Out Mic Measurement Trace Amplitude Phase Coherence X axis position Frequency Time Y axis value dB dBV Degrees Coherence The default status of the Cursor is Peak Tracking in which the Cursor finds the highest value of the amplitude trace Peak tracking is not used on Phase traces The peak track function is updated with each new measurement cycle Left and Right arrow keys move the Cursor on the horizontal axis Control Left and Right arrow keys move the Cursor on the horizontal axis by 24 bins approximately one octave If the L R arrow keys are used the automatic peak tracking function will be halted To restore the peak tracking func tion type lt Alt P gt The peak track function will be restored automatically any time the Measurement is changed The Up Down arrow keys move the Cursor to the next previous trace When a menu is open the arrow keys are used for navigating among selections v 2 0 Lab On Turns Cursor on Peak Track Enables peak tracking mode 49 2 8 Generator GENERATOR V2 0 amp V2 3 Off F1 Var Sine Low 16 1k High 500 22k Figure 40 Generator Menu Structure The Generator serves as a convenient excitation signal when Source Independent Measurements are not required Its output is capable of a maximum voltage swing of 26 dBV and its source impedance is 300 2 8 1 Off F1 Shortcut key F1 turn
98. urs after the Eq outputs speakers may be muted after storing the Room speaker Fre quency responses and equalizers may be adjusted while being viewed against the stored Room speaker data This is very advantageous in situations requiring an absolute minimum amount of disturbance Speaker switching is closely tied to the present Procedure Each Procedure has a different strategy for selecting speakers Pretest All speakers are turned on and may not be muted Single System Only the present Branch s speaker is selected All others are muted Lobe Study Any combination of speakers may be selected except the present Branch s e External Delay Any single speaker may be selected except the present Branch s Combined Systems Any combination of speakers may be selected however the present Branch s speaker is always on and cannot be muted Mic Eq Mic Compare Any combination of speakers may be selected Show Quit All speakers are turned on and may not be muted Speakers switching also follows Branch changes making it unnecessary to do speaker switching when a different Branch is selected The speaker Menu allows individual manual switching of speakers and provides four options all Off Mutes all speaker systems Allows system equalization when when it is important to minimize the use of test signals in a venue Select A Button Menu providing individual speaker on off switching
99. vel Puise Var Sine System Reset Phones Power Keyboard To Keyboard Ua A A F a al A Microphone To DUT From at Input DUT DUT Input Output Figure 55 v 2 0 Lab Connections 79 80 To Monitor SOURCE BUSS INPUT a To Console Line Input SVGA Cable IEC Power 15 pins Cable D9 shell To AC Outlet Measurement Microphone Monitor To Front Panel Mic Input ih Ly dd G S gt Pe ES gt p P CU C B A To Equalizer From Equalizer Inputs Outputs Figure 56 v 2 3 Stereo Connections E B To Speaker Systems z 2 O Souriau 851 01A20 39550 From System Sends To Monitor c l SN SOURCE iS To Console BUSS INPUT A Line Input Grn SVGA IEC Power Cable Cable 15 pins D9 shell To AC Control To Souriau Outlet Cable Monitor 851 01A20 39
100. veraging all data samples are averaged until a Restart command flushes out the averager As each new sample comes in it is added to the others the sum of which is divided by the accumulated number of samples Accumulator averaging yields very quick display and increased stability with more samples It has three distinct disad vantages from FIFO averaging Each frequency bin contains an unknown number of samples Later averages have very little effect on the total This means that if the system under test changes the change will be barely detectable A Restart is required any time the system under test changes The Accumulator averaging option is available in Measure Delay finder for all system software versions In v 2 0 Lab the Accumulator is also available for Frequency response measurements Regardless of which averaging type is chosen an automatic Restart will occur whenever The Branch is changed The Internal Delay Time is changed The Position Mic Gain is changed e The Speaker Selector is changed The Branch Eq or Microphone Setup Panels are edited This prevents the averager from containing data of different sources or types 2 6 2 Average Menu Selections Restart Restarts averager and clears out all previous samples from the averager Shortcut key R Numerical Selections Select the number of averages Accum Accumulating average limited to 999 samples available in v 2 0 Lab Fre
101. wing a Room re sponse selecting Data Recall brings up Room memory traces In Group view Room Eq and Result memory traces are displayed However these defaults may be easily overridden Any recalled memory trace may be viewed by using the View Memory menu For example a Room memory trace may viewed along with a live Eq trace See Memory Tracking 2 3 13 Memory Tracking In v 2 3 Stereo and Multi channel Memory Tracking conveniently automates commonly used memory views There are two types of Memory Tracking Room Eq and Branch Compare Room Eq Room Eq Memory Tracking works as follows In Eq view the Room memory traces are recalled and in Room view the Eq memory traces are recalled Result view recalls Result traces This feature is useful during system equaliza tion In Room Eq memory tracking all data are recalled from the present Branch Branch Compare During Branch Compare Memory Tracking traces are automatically recalled from a Compare Branch Each Branch can be assigned a Compare Branch this is done in the Branch Setup Panel Example If Branch 1 and 2 are being compared to Branches 5 and 6 respectively then Branch 5 s memory traces are displayed while Branch 1 is being measured and changing to Branch 2 brings up Branch 6 s memory Memory Tracking is initially off and is selected from the Data menu When selecting Branch Compare Memory Track ing you must also select which Branch you wish to compare the
102. y 1 View the Delay finder response in the lower screen which contains the full resolution needed 2 Measure in the near field on axis of the speaker system whenever possible 3 Verify any questionable responses by viewing the phase response refer to Section 2 2 3 Frequency re sponse Multiway loudspeaker systems can exhibit complex interactions in their crossover regions It can be misleading to try to ascertain polarity information based on single drivers since those that appear to be reversed in polarity may actu ally be optimized in their crossover range Therefore the most accurate method for measuring polarity is to view the phase response in Frequency response measurements 23 Measure Delay finder screen configuration v 2 0 Lab Screen Type Color Signal Channels Upper Time Blue Reference Vs Measurement Lower Time 10 Blue Reference Vs Measurement v 2 3 Stereo and v 2 3 Multi channel Screen Type Color Signal Channels Upper Time Blue Result Eq Input Vs Mic Lower Time 10 Blue Result Eq Input Vs Mic The Result impulse response is the default Room spkr or Eq may be selected under the View Menu Colors are as follows Color Type Signal Channels Blue Result Eq Input Vs Mic White Room speaker Eq Output Vs Mic Orange Eq Eq Input Vs Eq Output Note The 1 Eq Type is not available in Delay finder 2 2 3 Frequency response Frequency response measurements display the difference transfer

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