[speex-dev] reduction of noise due to high microphone gain

[Tongbiao Li]

This works really well for white noise reduction.  However what I've noticed was the amplitudes of normal speech samples also get reduced.

Is this something by design, or is there a way to automatically recover the original speech sample volumes ?

<p>Thanks.

<p>Tongbiao

<p>-----Original Message-----
From: Jean-Marc Valin [mailto:jean-marc.valin at hermes.usherb.ca] 
Sent: Tuesday, August 12, 2003 12:44 PM
To: speex
Cc: Tongbiao Li
Subject: Re: [speex-dev] reduction of noise due to high microphone gain

Hi,

You might want to try the denoiser I've got in CVS (that will go into
Speex 1.1 eventually). It will remove stationary noise from the signal
and probably help the silence detection. See testdenoise.c for how to
use it. There's also a better VAD in the denoiser but speex_encode
cannot make use of it yet.

        Jean-Marc

Le mar 12/08/2003 à 15:03, Tongbiao Li a écrit :
> Hello,
> 
>  
> 
> With high microphone gain, I seem to have problem making the silence
> detection work.  
> 
>  
> 
> The speech detection works well for the rare dish sample, which has
> very low noise amplitudes in silence regions.  However, if the
> microphone gain is set to really high, noise samples are taken as
> speech, as indicated by the non-zero return value from speex_encode()
> calls.
> 
>  
> 
> I had VAD turned on.
> 
>  
> 
> Are there other settings that I need to adjust?  If not, could someone
> recommend a suppression solution in this case ?
> 
>  
> 
>  
> 
> Thank you,
> 
>  
> 
>  
> 
> Tongbiao Li
> 
>  

-- 
Jean-Marc Valin, M.Sc.A., ing. jr.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada
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