[speex-dev] speex preprocess redux

[Jean-Marc Valin]

Hi,

The speex_preprocess_estimate_update(....) function is only used when you want
to perform adaptation without running the denoiser (e.g. when using
push-to-talk). In most cases, you probably won't need it though.

Second thing, if you want to make adaptation slower, look for a modulo (%) in
the code and increase the value next to it (default is %100 or something like that).

As for the VAD, it's a really difficult problem because 1) the latency is small
and 2) some people want different things from it (some want it to transmit
everything but the stationary background noise, others want only speech). BTW,
VAD doesn't need to be after the denoiser since it estimates the noise anyway...

Jean-Marc

Quoting Tom Harper <tharper at sightspeed.com>:

> Hi All & Jean Marc,
> 
> Once again I find myself delving into the pre-processing code to fiddle
> with the VAD, AGC and denoising code.
> 
> Where i am at is that I have implemented all of Steve Kann's mods, and
> they are 90% of the way there in terms of working, except that I am still
> having issues denoising open air mics.  But that is tangential to my
> question-
> 
> I was wondering what the following function is supposed to be used for:
> speex_preprocess_estimate_update(....)
> 
> I couldn't find anywhere in the code that references it- it appears to
> update
> the noise estimate without denoising anything- ?  If so, does this need to
> be called for AGC to work, or?
> 
> Thanks,
> Tom
> 
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