[Gta04-owner] Speex echo cancelation now working?

Belisko Marek marek.belisko at gmail.com
Fri Mar 30 13:51:53 CEST 2012


Hi,
On Fri, Mar 30, 2012 at 1:21 AM, Radek Polak <psonek2 at seznam.cz> wrote:
> Hi,
> i think i have fixed speex echo cancellation in gsm voice routing program.
> It's now pushed on github:
>
>        https://github.com/radekp/gta04-gsm-voice-routing
>
Nice work. I'm gta04 owner just from yesterday but isn't there any way to use HW
echo cancellation in modem somehow. This is just newbie question. I
browse free runner
wiki and there are modem command to enable echo cancellation.

> You can compile it on GTA04 [1]. Copy it then to /opt/qtmoko/bin or manually
> start during call. So far all looks good - I have now quite loud volume and
> the other side hears echo no more. Maybe some params can be tuned, i just
> guessed filter_length and you can do even better cancellation with:
>
> speex_preprocess_ctl(preprocess_state, SPEEX_PREPROCESS_SET_ECHO_STATE,
> echo_state);
>
> Btw it's documented here [2].
>
> So happy GSM calling,
>
> Radek
>
>
> [1] apt-get install build-essential libspeexdsp-dev
> [2] http://www.speex.org/docs/manual/speex-manual/node7.html
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regards,

marek

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