Re: speex echo cancellation tested?

On Wed, 2008-04-23 at 23:46 -0400, Mihai Balea wrote:
> On Apr 23, 2008, at 6:06 PM, Peter Grayson wrote:
> 
> > Hi Matt,
> >
> > On Wed, Apr 23, 2008 at 4:39 PM, Matthew Crane
<mcranenovell.com>  
> > wrote:
> >> On Wed, 2008-04-23 at 13:57 -0600, Matthew
Crane wrote:
> >>> Hello all:
> >>>
> >>> I'm investigating how well the speex echo
canceller works in the 2.1
> >>> branch of iaxclient.  Whenever I turn on
the speex AEC in our  
> >>> client,
> >>> the audio that is sent by the client.
> >>
> >> Sorry... that last sentence should read,
"...the audio that is sent  
> >> by
> >> the client is almost completely
unintelligible."
> >>
> >>> Has anyone tested the performance of the
speex echo canceller with 8
> >>> kHz-sampled audio?
> >
> > I've got a patch that's been sat upon for quite a
while now that
> > begins integrating the new (or at least greatly
improved) speex aec
> > module (introduced in speex-1.2beta2) into
iaxclient. I've been
> > holding off committing these changes because the
results have really
> > only been verified to be good on Mac. However, I
think this code goes
> > in the right direction. Even when the AEC fails to
cancel echo, it
> > doesn't make things sound worse.
> 
> You can actually find this code in
branches/team/mihai/echocan.
> As Pete said, performance is pretty good on Mac.  On
windows it seems  
> that it does not work, but at least it doesn't make
things worse.
> The reason seems to be related to crappines in Windows'
audio APIs.   
> Performance on Linux has not been tested (at least not
by me)

> Anyways, bottom line is the code currently in trunk
does not have  
> functioning AEC
> 

Thanks Pete and Mihai.  I'll have a look at the branch.  For
some
reason, I assumed that the requirement for speex-1.2beta3 in
the 2.1beta
of iaxclient was because of AEC.  

If I can verify that the latest speex AEC works well inside
of iaxclient
on linux, I might try getting one of the low-latency Windows
portaudio
implementations working.  In regards to the wmme API, you're
right --
it's unusable for AEC.

-Matt



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> If I can verify that the latest speex AEC works well
inside of  
> iaxclient
> on linux, I might try getting one of the low-latency
Windows portaudio
> implementations working.  In regards to the wmme API,
you're right --
> it's unusable for AEC.

Good luck with that.  Just to spare you some pain, I've
tried Direct  
Sound, and it does improve AEC performance., but it
introduces some  
other issues, such as audio under/overflows.  In addition to
that,  
Portmixer doesn't work with DirectSound, so you won't have
volume  
controls.

Let us know how it goes...

Mihai
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