Re: [Linphone-developers] Improving acoustic echo cancellation on Raspberry Pi using Linphone?

[Ghislain MARY]

Hi,

The speex echo canceller is quite long to converge. It's the reason why 
we have our own repository for speex with changes to save and restore 
the echo canceller state.
To check if this is enabled in your case, look for a .linphone.ecstate 
file next to your linphonerc file after a call. If it's there the echo 
canceller should converge quite fast.
Otherwise the Linphone you are running may be using the "standard" speex 
library and there's not much to be done.

Cheers,
Ghislain

Le 02/07/2015 22:13, Mark Eastwood a écrit :
> Hi,
> > I’m using two RPi to communicate as speakerphones using the Linphone SIP 
> > clients and despite tuning the echo parameters exhaustively I still get quite a 
> > lot of echo for the first several seconds of a call - I’m driving the speaker 
> > quite loud and also want maximum microphone sensitivity (Alsamixer levels set 
> > around 82 each) which isn’t ideal for reducing echo.  I’m struggling to make 
> > further improvements using the .linphonerc file parameters and wondered if 
> > anyone has additional suggestions for how I might reduce this initial echo. Are 
> > there additional parameters I can play with somewhere?
> >
> > Many thanks for any help,
> >
> > Mark
> _______________________________________________
> Linphone-developers mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/linphone-developers