[speex-dev] Re: [Fwd: Re: [JDEV] Videoconferencing with jabber / Re: [speex-dev] Videoconferencing with speex and jabber]

Jean-Marc Valin Jean-Marc.Valin at USherbrooke.ca
Thu Nov 27 15:08:15 PST 2003

> Hmmm.. i had the simple idea to mix the encoded streams with the method
> outstream [idx] = (stream1[idx] + stream2[idx]) / 2;

Regardless of how you mix the signals, the problem is that Speex (and
most/all other speech codecs) doesn't do a good job at compressing two
simultaneous voices. Speex uses a model of voice production to better
encode the signal, but a mix of two voices isn't well described by that
model. You need to increase the bit-rate in order to compensate for


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

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