Re: [Ekiga-list] speakerphone mode

[Alan Lord <alanslists gmail com>]

Damien Sandras wrote:

> That is a good idea.
>
>
> Notice we could also reuse echo cancellation algorithms from Asterisk.

Hi, forgive the intrusion.

I had a similar idea a week or so ago but am not a software engineer. I 
built and installed Asterisk on my LFS (Linux From Scratch) server. I 
have a cheap analogue PSTN (x100p) card and the standard EC with the 
Zaptel modules didn't do much - echo was bad...

I installed the OSLEC canceller from David Rowe 
(http://www.rowetel.com/ucasterisk/oslec.html) which is simply a kernel 
module that interfaces to the zaptel module. It is brilliant! Worked a 
treat...

On my desk I use the Polycom Communicator (a handsfree combined 
mic/speaker) USB audio device. And although most of the EC and noise 
suppression technology is apparently in their Windows only drivers, it 
works "OK" on my Ubuntu Desktop, but I do have some problems with echo.

I was wondering if it would be possible to use the OSLEC module in a 
more "generic" way (perhaps within ALSA) so that it could be used to 
provide EC services to almost any audio device or as a "driver" simply 
for my Polycom C100s... Is this a sensible idea?

Cheers

Alan
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