Speex dev - Aug 2005 - Help needed regarding AGC

Hello All, 
 
I use AGC as one of speex preprocess options in VOIP application. In most cases
it works very fine.
 
However, at the very beginning of a call when no one has started talking [ and
some times in the middle of calls], AGC makes large noise and it gradually
increases. Interestingly, when someone starts talking, from that point it works
very well.
Is it the normal behaviour? Since there is no level to compare at that point, it
may assume no speech as normal talk.

Can anyone please put some light on this issue. Thanks in advance.

Regards

Shantanu

 

 

 


		
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Yes, the problem is that as long as nobody as talked yet, it's
impossible to know the level of voice. The only thing I can suggest is
to force a maximal gain or try to detect the situation and not apply AGC
until someone talks.

	Jean-Marc

Le jeudi 11 ao?t 2005 ? 08:49 -0700, Shantanu Gramsci a ?crit
:
> Hello All, 
>  
> I use AGC as one of speex preprocess options in VOIP application. In
> most cases it works very fine.
>  
> However, at the very beginning of a call when no one has started
> talking [ and some times in the middle of calls], AGC makes large
> noise and it gradually increases. Interestingly, when someone starts
> talking, from that point it works very well. 
> 
> Is it the normal behaviour? Since there is no level to compare at that
> point, it may assume no speech as normal talk. 
> 
> Can anyone please put some light on this issue. Thanks in advance.
> 
> Regards
> 
> Shantanu
> 
>  
> 
>  
> 
>  
> 
> 
> 
> ______________________________________________________________________
> Start your day with Yahoo! - make it your home page 
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-- 
Jean-Marc Valin <Jean-Marc.Valin@USherbrooke.ca>
Universit? de Sherbrooke