ecasound resample problem

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Subject: ecasound resample problem
From: Aaron Heller (heller_AT_AI.SRI.COM)
Date: Sun Jul 25 2004 - 08:57:23 EEST

I used ecasound to resample an audio file from 96000 to 44100 kHz sample
rate and noticed that there were faint clicks in the resulting file.

To test this further, I wrote a csh script that generates 100Hz and 1kHz
sine wave files at 96000 kHz sample rate and then resamples them to
44100 and 48000, with both the resample and resample-hq options, and at
both 16-bit and 32-bit word length. All of the resampled files have
clicks.

Here is the script:

#!/bin/csh -x
foreach freq (100 1000)
   foreach st (s32_le s16_le)
     ecasound -t:5 -f:$st,2,96000 -i null \
              -el:sine_fcac,$freq,.1 -o:$st-$freq.wav
     foreach sr (44100 48000)
       foreach algo (resample resample-hq)
         ecasound -f:$st,2,$sr -i:resample,auto,$st-$freq.wav \
                  -o:$st-$freq-$sr-$algo.wav
       end
     end
   end
end

The script, audio files, and wallpaper can be found at:
   http://www.ai.sri.com/ajh/audio/resamp-test/

Any help would be appreciated. Thanks.

Aaron Heller <heller_AT_ai.sri.com>
Menlo Park, CA USA

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