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

[Mihai B. <mi...@ha...>]

On Apr 23, 2008, at 6:06 PM, Peter Grayson wrote:

> 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.

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

Cheers
Mihai