Re: [Ekiga-list] speakerphone mode

[yannick <sevmek free fr>]

Hi,

Le mercredi 21 novembre 2007 à 13:31 +0100, Damien Sandras a écrit :
> Le mercredi 21 novembre 2007 à 12:23 +0000, Alan Lord a écrit :
> > Damien Sandras wrote:
> > > 
> > > It is certainly worth having a look. The algorithm is probably good and
> > > could certainly be used in ekiga.
> > > 
> > > However, I fear the module itself is probably very "zapata" specific and
> > > thus not usable with standard sound applications.
> > > 
> > > Very interesting link though...
> > 
> > I don't think it is actually. If I understand what David has done (which 
> > I might not of course!) he has made a wrapper around the EC itself to 
> > interface to the zaptel driver. In fact one has to patch the zaptel 
> > sources so that it knows where and how to use the OSLEC canceller.
> 
> It might be interesting to use the same echo canceller.
> 
> But perhaps it is the same one than the one we are using written by
> Jean-Marc Valin ?

I doubt that:

The author refers to Jean-Marc Valin as a helper, not as an author for
OLSEC. IMHO, you should discuss it with Jean-Marc Valin.

Quote from the URL above
"Background and Credits
Oslec started life as a prototype echo canceller and G168 test framework
from Steve Underwoods Spandsp library. Steve wrote much of the DSP code
used in Asterisk, and the Zaptel echo cancellation code is heavily based
on his work.

Using the Spandsp G168 test framework, a high performance echo canceller
has been developed and carefully tested. Working together with alpha
testers the performance has been brought to a beta state. More.

Thanks to Steve Underwood, Jean-Marc Valin, and Ramakrishnan
Muthukrishnan for their suggestions and email discussions. Thanks also
to those people who collected echo samples for me such as Mark, Pawel,
and Pavel. Thanks Nic Bellamy for help with testing, explanation of long
path issues, and MMX support. Thanks Tzafrir for testing and
patches/enhancements and Dmitry for help with multithreaded and locking
issues.

Thanks Vieri for finding a circuit with a tail > 32ms, and Patrick for
submitting a Zaptel 1.2.18 patch. Thanks Dave Fullerton and Carlton
O'Riley for Zaptel 1.4.3/1.4.4 patches. Thanks Bill Salibrici for
finding a memory leak.

Thanks to Peter Schlaile for porting Oslec to mISDN. Thanks also to
Kristijan Vrban for sending me some ISDN hardware so I can help with the
ISDN/Oslec testing!"

Regards,
Yannick


> -- 
>  _     Damien Sandras
> (o-      
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