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resources:tools-software:sigmastudio:toolbox:systemschematicdesign:speakerresponsemlssa [19 Jun 2012 20:27] – created William Jahnresources:tools-software:sigmastudio:toolbox:systemschematicdesign:speakerresponsemlssa [12 Jun 2019 07:57] (current) – [MLSSA File Format] Ruben Bjerregaard
Line 12: Line 12:
 {{speakerresponsepic1.png}} {{speakerresponsepic1.png}}
  
 +This speaker response cell serves as an informational tool only. It does not have any intelligence that attempts to correct for the frequency response of the speaker. It is up to the user to tune the frequency response as needed.
 +
 +=====MLSSA File Format=====
 +Note: Speaker files are ASCII text in the MLSSA format, with header information 
 +in quotes on the first two lines. Data are delimited by commas and by line. **Note:** SigmaStudio only accepts the MLSSA file if the 2nd line in the header of the matches the following exactly: <6 white spaces> "Hz" <2 white spaces> "Mag (dB)" <7 white spaces> "deg" <New line>. If not, the following message will be shown: //Text file does not contain valid speaker data or file is Read Only//
 +
 +Here is an excerpt from an example MLSSA file:
 +
 +  30 deg OFF Axis Speaker.txt
 +  "Sensitivity Excess Phase - dB SPL/watt (8 ohms, @0.50 meters) (High)"
 +  "Hz"  "Mag (dB)"       "deg"
 +  18.42571,   84.52863,  -84.71303
 +  27.63856,   86.17458,  -106.1154
 +  36.85141,   87.69691,  -121.8004
 +  46.06427,   89.03174,  -131.5714
 +  55.27712,   90.10346,  -139.7477
 +  64.48997,   91.02969,  -145.4236
 +  73.70283,   91.75486,  -150.4895
 +  82.91568,   92.44266,  -154.1127
 +  92.12853,   92.89854,  -156.9609
 +  101.3414,   93.26881,  -159.7996
 +  110.5542,   93.58502,  -162.1092
 +  128.9799,   93.96911,  -166.0203
 +  138.1928,   94.03343,  -167.4651
 +  156.6185,   94.05841,  -170.1367
 +  184.2571,   93.83049,  -173.6306
 +  202.6828,   93.62083,  -175.2098
 +  221.1085,   93.41589,  -177.1104
 +  248.747,   93.20612,  -179.7584
 +  276.3856,   93.04501,     178.67
 +  313.237,   92.84193,   175.7724
 +  ...
 +  ...
 +
 +
 +=====Example MLSSA Files Bundled with SigmaStudio=====
 +Example MLSSA files can be found in the SigmaStudio install directory's Speaker Measurements subfolder.
 +{{ :resources:tools-software:sigmastudio:toolbox:systemschematicdesign:speaker_measurements_folder.jpg? |}}
 +
 +=====Viewing MLSSA Response=====
 +After adding an MLSSA cell to the project and selecting a response file, the response can be viewed using the Stimulus/Probe blocks.
 +{{ :resources:tools-software:sigmastudio:toolbox:systemschematicdesign:stim_probe_mlssa_basic.jpg? |}}
 +By clicking on the probe button and then the stimulus button, the response will be displayed.
 +{{ :resources:tools-software:sigmastudio:toolbox:systemschematicdesign:mlssa_response.jpg? |}}
 +
 +=====Correcting the Speaker Response=====
 +To attempt to correct the speaker response, insert filters in the signal flow between the stimulus and probe, and tune them to attempt to create the desired frequency response.
 +{{ :resources:tools-software:sigmastudio:toolbox:systemschematicdesign:screenhunter_06_jul._24_14.37.jpg? |}}
 +The result of this basic 3-band EQ on the 30 degree off-axis speaker response is shown here:
 +{{ :resources:tools-software:sigmastudio:toolbox:systemschematicdesign:screenhunter_07_jul._24_14.37.jpg? |}}
  
-<note>Note: Speaker files are ASCII text in the MLSSA format, with header information  
-in quotes on the first two lines. Data are delimited by commas and by line.</note> 
resources/tools-software/sigmastudio/toolbox/systemschematicdesign/speakerresponsemlssa.1340130449.txt.gz · Last modified: 19 Jun 2012 20:27 by William Jahn

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