[Speex-dev] Paper on Speex and Vorbis

Jean-Marc Valin jean-marc.valin at usherbrooke.ca
Sun Mar 19 20:55:33 PST 2006

Hi all,

This should please all those who want to know more about Speex or
Vorbis. Monty and I have just finished writing this paper: "Improved
Noise Weighting in CELP Coding of Speech - Applying the Vorbis
Psychoacoustic Model To Speex" which you can get at:

It's probably the best description of the Speex encoder to data and it
has a lot of details about the Vorbis psycho-acoustic model. For those
who actually want to try the improvement described in the paper, just
configure Speex with --enable-vorbis-psy .


P.S. This will be presented at the next AES convention in Paris (May).

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