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Re: [Linphone-developers] Improving acoustic echo cancellation on Raspbe

From: Ghislain MARY
Subject: Re: [Linphone-developers] Improving acoustic echo cancellation on Raspberry Pi using Linphone?
Date: Tue, 07 Jul 2015 08:50:44 +0200
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0


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.


Le 02/07/2015 22:13, Mark Eastwood a écrit :
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,

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