[vorbis] Lossy Audio Compression Research

[Ross Vandegrift]

Hello everyone,

        I'm a student at the Universtiy of Delaware, and will be soon starting
some research on the effects of lossy audio compression on speech sounds.  I
will be preforming test with both mp3 and vorbis.

        First of all, if I use the '--ogg' switch to lame, does lame use GPSYCHO
to encode the wave, or some other psychoacoustic model (perhaps one designed for
the vorbis algorith)?  Along these lines, I'm unable to get lame-3.89 and 
libvorbis rc2 to play nicely together.  The lame build breaks when compiling
ogg support (this is probably a known bug, so I'm not posting relevant details.
If I'm wrong about it being know, we'll go from there).

        Second, since audio compression is based on the idea of a plausable
psychoacoutic model.  There seems to be some documentation on GPSYCHO, which
lame uses.  But the link 'The Vorbis probability model' on xiph.org is noteably
not a link.  Is there any addition documentation about the psychoacoustic model
that vorbis uses?

        Finally, does anyone know of similar studies that have already been
performed, either academic or not?

Thanks,
Ross Vandegrift
ross at willow.seitz.com

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