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Old 15th September 2005, 06:40 AM   #1
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Join Date: Apr 2004
Location: Somerville MA
Default Stereo Calibration

Hello,
I would like to write a program that can calibrate my home theater, or at least the FR & FL channels for the time being. I have done some signal proc work, mainly on images, never on audio input. I'm looking for a few pointers to help me get started.

Can anyone give quick intro on what I'm looking for in a wave to play? It I generate a wav in matlab it (looking at it as a plot) seems to need to be postive to negative in the Y axis with time in the X axis.

How do I convert a wav to a more tradional responsivity graph?

In the end I would like to look at the systems SNR and how flat the responsivity on the system is. From there I will see what interests me. I'm going to purchase an inexpensive mic to look at this initially, from there I will at my results. Also, I want to keep the code simple so I'm going to do it in Matlab at least for starters.

Thanks,
Anthony
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Old 22nd September 2005, 01:22 AM   #2
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Join Date: Apr 2004
Location: Somerville MA
bump - someone has to know a little bit about this. I just need a few pointers to be able to code my ideas. Ideas can be a terrible thing
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Old 22nd September 2005, 03:50 AM   #3
jcx is offline jcx  United States
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Join Date: Feb 2003
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complex subject, lots of info on web hard to judge what is relevant to you

http://www.duffroomcorrection.com/wi...pulse_response

may be a starting place for sw already developed for the task

(from massive thread A how to for a PC XO. )

possibly helpful freeware:
http://audio.rightmark.org/products/rmaa.shtml

many more sw tools exist in the general area of pc sound card based audio measurement
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