Speex dev - Aug 2004 - To: speex-dev@xiph.org

Hello I'm working about audio and video codecs. I'm making a research
about the state-of-the-art in coding technologies.

My question is about the speex codec 1.0.  I would like to know the name of the
algorithms that it uses.(LPC,CELP..). It uses more or less the same algorithm
for narrowband and wideband?

Finally i would like to ask about future codec developement projects.

Thanks for all!!!!!

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> My question is about the speex codec 1.0.  I would like to know the
> name of the algorithms that it uses.(LPC,CELP..). It uses more or less
> the same algorithm for narrowband and wideband?
Speex uses CELP in its simplest form (i.e. no fancy, patented codebook
search techniques). For wideband, a narrowband stream is encoded and
complemented with a CELP encoding of the high-band.
> Finally i would like to ask about future codec developement projects.
Well we just reached 1.0 and we're focusing mainly on fixing bugs,
tuning and various ports. No major new features planned in the short
term.

        Jean-Marc


-- 
Jean-Marc Valin, M.Sc.A.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada

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