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Re: [Linphone-developers] Speex AEC in WB mode linphone 1.4.0

From: Simon Morlat
Subject: Re: [Linphone-developers] Speex AEC in WB mode linphone 1.4.0
Date: Thu, 21 Sep 2006 09:54:05 +0200
User-agent: KMail/1.9.4


I've never tried the echo canceler in wideband mode.
Is it known to work ?
In speex source, mdf.c I can read:
 /* FIXME: Make that an init option (new API call?) */
   st->sampling_rate = 8000;

Probably the 16000Hz is not supported.
You should ask speex author (Jean Marc Valin) to have more precise 


Le mercredi 20 septembre 2006 10:10, address@hidden a 
écrit :
> Hello,(It is my first post)
> I just tried the latest linphone version (1.4.0) which include Speex NB
> and WB and the possibility to use speex AEC.
> Unfortunatly, I found that the AEC does not work well with WB mode.
> (it seams like the AEC cut the wrong signal !)
> Does anybady succeed in making the AEC working with speex WB ?
> I found that the use of a tail length of 2048 and a framesize of 128 to
> initialize the AEC seems to be too short for WB mode. thus, as recommended
> in the speex manual, I replaced them with a 3200 tail length and a 320
> frame size.
> I also modified in "speex_ec_init"
> s->den = speex_preprocess_state_init(s->framesize, 16000); (WB mode...)
> But it still doesn't work...
> Does anybody have an idea of how to make this speex AEC work in WB mode ?
> Thanks for your help
> Sorry for my English
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> Linphone-developers mailing list
> address@hidden

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