Hi, It seems that when using Realtek audio driver sipxtapi has bad audio quality whereas using Sound Max driver, audio quality is good Paulo On Wed, Nov 4, 2009 at 7:51 PM, Jeremya <jer...@electrosilk.net> wrote:
> Paulo Vicentini wrote: > > Hi, > > I wonder if someone is facing also such issue: > > sipxtapi using G711a/u decode good quality RTP audio but remote end > > point decode bad voice quality > > sipxtapi (hear good quality audio)<----------> Endpoint (ATA / Xlite) > > (hear low quality audio) > > Maybe a sipXtapi g711 encoding issue? > > - Network is not the issue ( LAN) > > - Windows Vista / XP > > - main branch > > > > > Hello Paulo, > > I have a similar problem with my systems though they are Linux based. > > With some sound devices the audio from sipxtapi to the remote device has > a low level buzz. There is also an audible low level echo. I am still > working to characterize both problems. > > I suspect the echo is generated inside sipxtapi. The buzz may be device > sample rate related. I'm having a test system set up to vary the sample > rate to find out for sure. I know for certain that some devices don't > work very well at 8000 Hz sample rate - they only offer audio sampling > of 8000 Hz linear 8 bit and/or rate adjust to 11025 Hz with a very poor > quality sample rate conversion. > > The problem with using a different device sample rate to internal 8000 > Hz sample rate is that - on my systems at least - there are a lot of > messages about jitter buffer 'giving up' and there is a short break of > audio. This is based on 11436 revision from svn > > _______________________________________________ > sipxtapi-dev mailing list > sipxtapi-dev@list.sipfoundry.org > List Archive: http://list.sipfoundry.org/archive/sipxtapi-dev/ >
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