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There's no perfect solution to the multiple client problem. Each approach has advantages and drawbacks: 1) Mixing at the server - Allows a constant bandwidth for every client - Allows compatibility with regular VoIP prones - Requires transcoding, even when only on person is talking - Higher bit-rate required for the general case (one speaker is talking) 2) Sending multiple streams - Possible

CELP based coders perform poorly when you mix streams. Perhaps, we need a transform code or a subband code at somewhat higher rate 12-16 kbps that will retain the quality after transcoding and mixing. Is the speex ultra-wideband based on subband coding? -Devendra Jalihal <p>On Fri, 21 Nov 2003, Ulrich B. Staudinger wrote: > Hi, > been silent in this discussion for quite long ...

Hi, been silent in this discussion for quite long ... Am Fr, 2003-11-21 um 08.07 schrieb Jean-Marc Valin: > There's no perfect solution to the multiple client problem. Each > approach has advantages and drawbacks: > > 1) Mixing at the server > - Allows a constant bandwidth for every client > - Allows compatibility with regular VoIP prones > - Requires transcoding, even

Well, i don't know if we speak of the same ... The quality is ok, but the encoding of a PCM frame on the tested machine took 2ms, which (if the PCM frame is 7ms in length) means the machine can only encode three streams in realtime ... <p><p>Am Sa, 2003-11-22 um 03.30 schrieb Devendra Jalihal: > CELP based coders perform poorly when you mix streams. Perhaps, we need > a