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Jean Marc,<br><br>
I have been fiddling around with preprocess to try to get it sounding
<br>
less metallic/underwater- so based on some things said recently,<br>
I have been first fiddling with mean_post and mean_prior to try to <br>
get them to do change the update rate, so that update_noise gets <br>
called at the right times.<br><br>
Haven't made it too deep into the code, but I have a few <br>
questions in speex_preprocess:<br><br>
Is there a particular reason for choosing .1 as the gamma<br>
coefficient (for the <font face="Arial, Helvetica">posteriori
SNR)</font>? It seems like you started<br>
to use a predictor and then hard coded it... probably this is<br>
in some paper but I can't find it so far.<br><br>
<font face="Arial, Helvetica">Are the following best engineering
judgement or statistically based:<br>
</font><font face="Courier New, Courier">if (mean_prior<0.23f
&& mean_post<0.5f)<br>
</font><font face="Arial, Helvetica">I seem to have altered mean_prior
and mean_post such that <br>
these don't work anymore so I was wondering how you went<br>
about choosing these.<br><br>
Same question on st->gain having 2.0f as an arbitrary limit?
Seems<br>
to work but just wondering about why it works to cap it there.<br><br>
same question on:<br>
st->echo_noise[i] = (0.3f*st->echo_noise[i] + echo[i]);<br>
Seems to work well in the original code, trying to figure<br>
out why it is what it is.<br><br>
So far it seems like denoising is working well, but now I can no
longer<br>
properly handle the echo signal. arg,<br><br>
Thanks for all of your help so far!<br><br>
Tom<br><br>
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______________________________________________<br>
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<font face="verdana" size=2>Tom Harper<br>
Lead Software Engineer<br>
SightSpeed -
<a href="http://www.sightspeed.com/">http://www.sightspeed.com/</a><br>
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<font face="verdana" size=2>918 Parker St, Suite A14<br>
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