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MathGroup Archive 2008

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Possible bug in WAV export

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87569] Possible bug in WAV export
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Sun, 13 Apr 2008 03:32:24 -0400 (EDT)
  • Organization: University of Bergen

Something is wrong with WAV export.  I tried the following:

snd = Play[
   Sin[440 2 \[Pi] t] + Sin[2 440 2 \[Pi] t] + Sin[3 440 2 \[Pi] t] +
    Sin[4 440 2 \[Pi] t], {t, 0, 1}, SampleRate -> 44100,
   SampleDepth -> 16]

Export["test.wav", snd, "WAV"]

The produced WAV file has a terrible buzzing sound, which is nothing 
like the sound played in Mathematica.

Re-importing it and plotting the data shows that some of the samples are 
missing (they have the most negative value):

data = Import["test.wav"][[1, 1, 1]];

ListPlot[Take[data, {200, 500}], Joined -> True]

(AIFF and FLAC export appear to be working correctly in this case.)


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