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  Problem detecting average sound volume  (Read 1231 times)
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Offline dranonymous

Junior Devvie




Hoping to become a Java Titan someday!


« Posted 2005-07-03 21:36:58 »

Ok, I thought this was simple and maybe I'm doing something dumb.  I want to show the approximate / average volume of a sound.  I did the following -

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         sampleTotal += Math.abs(recordBuffer[1] * 256) + Math.abs(recordBuffer[0]);
         sampleTotal -= averageSampleBuffer[leadingSample];
   
         averageSampleBuffer[leadingSample] = Math.abs(recordBuffer[1] * 256) + Math.abs(recordBuffer[0]);
         averageVolume = sampleTotal / averageSampleBuffer.length;
         
         leadingSample++;
         leadingSample = leadingSample % averageSampleBuffer.length;


What I thought I could do was sample the first 2 bytes of a signed 16 bit audio stream every so often.  The sampling would occur as fast as my polling loop.  This doesn't seem to work though.  If I normalize the averageVolume, I don't seem to get above the half way point.  There also seems to be too much volume, even when things are quite.

Whats the right way to do this?  I want to show graphically the volume, but ultimately this is going to be used as a VOX, rather than having push a button to start and stop recording.

Cheers,
Dr. A>
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