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Re: [Linphone-developers] VAD for Speaker and Mic

From: Aurelien Bouin
Subject: Re: [Linphone-developers] VAD for Speaker and Mic
Date: Fri, 2 Oct 2009 00:02:00 -0700 (PDT)

I am currently working on a device that have a loud speaker(2 Watts) and a 
microphone really close to the speaker, it is based on an ARM iMX27 platform 
that embed linphone 3.1.2(currently) and works with an ffmpeg that uses 
hardware for video codecs...
I am really interested in using the VAD that is implemented in 
linphone(msvolume), but i really don't know how to tune it to work correctly 
with our devices, What I did is changed completely the msvolume to use a 
halfduplex mode, I could commit our implementation If you are interested, but I 
am still interested in your solution ...what could be even better is to be able 
to chose among different audio treatment that could be implemented . . .
thank you in advance for your time,

Aurelien BOUIN

> Do you know since what version of linphone has this feature been available?
since 3.2.0 (lastest)

> Eric
> On Wed, Sep 30, 2009 at 8:31 AM, Simon Morlat <address@hidden> 
> > Hi,
> >
> > This functionality is already implemented, it is called "echo limiter".
> > In [sound] section of linphonerc, add echolimiter=1 to enable it.
> > It's useful in cases where echo canceler cannot work (for various
> > reasons). It 's  implemented in mediastreamer2/src/msvolume.c
> > and driven by coreapi/linphonecore.c, within
> > linphone_core_start_media_streams()
> >
> > Simon
> >
> > Le mardi 29 septembre 2009 20:38:43, Eric des Courtis a ├ęcrit :
> >> Hello,
> >>
> >> I would like the run linphone with a loud speaker and a mic. I don't
> >> want feedback from the speaker into the mic. I was wondering if there
> >> is a mechanism to detect incoming audio (from the rtp stream) and to
> >> mute the mic during that time to prevent feedback? If not can anyone
> >> give me pointers on what would need to be done in order to accomplish
> >> this?
> >>
> >> Cheers.
> >>
> >> Eric des Courtis
> >>
> >>
> >> _______________________________________________
> >> Linphone-developers mailing list
> >> address@hidden
> >>

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