[Speex-dev] low data rate codecs

Keith Kyzivat kamaji at gmail.com
Fri May 15 06:06:03 PDT 2009

SipXtapi, and I believe many other SIP UAs use sip at much lower  
bitrate than you are -- 8kHz vs 25kHz. Quality is very good at 8khz -  
speech quality that is.

  If you're trying to use speex to compress music, forget it as speex  
was not designed for that -- use vorbis instead.

On Apr 24, 2009, at 14:09, "Pandya, Julee" <julee.pandya at lmco.com>  

> Hi,
> I’ve been testing out the speex narrowband codec at low data rates ( 
> using linphone and Counterpath’s Eyebeam).  I’m finding that at  
> data rates of ~25 kbps, the quality of the voice call is very poor.  
>  I know speex is supposed to work at much lower data rates (~2 kbps) 
> .  Has anyone verified that speex will produce reasonable quality at 
>  low data rates?  Are there any existing VoIP software clients that  
> will utilize speex at low data rates?
> Any help is greatly appreciated!
> Thanks!
> Julee
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> Speex-dev at xiph.org
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