Re: [Iaxclient-devel] speex echo cancellation tested?

[Peter G. <jpg...@gm...>]

Hi Matt,

On Wed, Apr 23, 2008 at 4:39 PM, Matthew Crane <mc...@no...> 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.

This patch was originally developed by Mihai and I've been using for
quite a while now. I believe that there are some general audio quality
improvements derived from this patch also. Specifically, there are
some compatibility fixes for speex-1.2beta3's agc interface.

In the next couple days I will merge this updated AEC patch into trunk.

Pete