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<DIV>Hi all,<BR><BR>I know of several studies that address the concern that
audio compression<BR>algorithms may distort the audio signal in a way that makes
it less useable<BR>for acoustic analysis of speech. An example of such a study
is Van Son<BR>(2002). Van Son observed in his experiments (looking at variables
that are<BR>typically of interest to phoneticians) that the distortion caused
by<BR>compression and subsequent decompression of speech (he looked at MP3,
Ogg<BR>Vorbis and Minidisc) is not greater (and generally much smaller) than
that<BR>caused by a change of microphone. Choice of (good-quality) microphone
varies<BR>widely between projects and is usually not seen as a problem. Van
Son's<BR>conclusion is, therefore, that decompressed speech can be
considered<BR>acceptable for most acoustic phonetic applications. See:<BR><BR><A
href="http://www.fon.hum.uva.nl/rob/Publications/CoCOSDA2002paper.pdf">http://www.fon.hum.uva.nl/rob/Publications/CoCOSDA2002paper.pdf</A><BR><BR>and
also:<BR><BR><A
href="http://www3.uji.es/~gonzalez/J%20Voice.pdf">http://www3.uji.es/~gonzalez/J%20Voice.pdf</A><BR><BR>It
has been two years since I needed to look into this subject. If anybody<BR>is
aware of more recent work that perhaps changes the picture, then I would<BR>be
interested.<BR><BR>Joan<BR><BR>----- Original Message ----- <BR>From: Victor E.
Roetman<BR>Sent: Monday, September 13, 2004 4:03 AM<BR>Subject: [LTS]Re:
compressed audio for acoustic phonetics (WAS: Audio device<BR>for field language
data collection)<BR><BR><BR>I'm no expert on this, either, but when I was in
NDSIL 2002, Peter<BR>Ladefoged and others were talking about some of these
things, and they<BR>all seemed to really like minidisk, and they seemed to have
no problems<BR>with measuring anything related to speech. Minidisks use
ATRAC<BR>compression, which is similar to mp3, so I expect mp3 would not be
any<BR>different. Plus, you can choose bit rates of greater than
128kb/s,<BR>variable bit rate compression, etc, and get better results.
There is<BR>also things like FLAC lossless compression for .wav files
which<BR>typically does somewhere around 50% compression.<BR><BR>Check out <A
href="http://www.avisoft-saslab.com/compression/compression.htm">http://www.avisoft-saslab.com/compression/compression.htm</A>
for<BR>some information, and regarding lossless compression methods you
could<BR>look at <A
href="http://flac.sourceforge.net/comparison.html">http://flac.sourceforge.net/comparison.html</A><BR><BR>vic</DIV>
<DIV> </DIV>
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