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<br>
<font color="#0000FF">Ya really serious about algorithms and tests. That
is my job, I am doing a PhD thesis on that matter. My concern is
mathematical and statistical aspects of vad and echo canceller. I don't
know much about what is in technology; I have been surfing for a while
but encountered a lot patented algorithms so don't know what is
behind?<br><br>
I would appreciate documents on what is most recently implemented in gsm
(cellular phones) and other technologies requiring vad and echo
cancellation. had a look to
<a href="http://www.vocal.com/" eudora="autourl">http://www.vocal.com/</a>
I see no database there, just a doc sheet about recommendation which is
nor rigorous neither of any help.<br><br>
if u have any direct link for such databases I would appreciate it
very much.<br><br>
best<br><br>
<br>
Zelda<br>
<br><br>
</font>At 00:44 20/02/2008, you wrote:<br>
<blockquote type=cite class=cite cite="">KMTDBOURSE wrote:<br>
><br>
> Know that<br>
><br>
><br>
> (OSLEC)<br>
><br>
> pretty well. Wanna test new algorithms but need wav data. Echo
Cancel <br>
> is also still under research process, VAD is part of a good echo
<br>
> canceller as it freezes the algo processing in case of double-talk.
<br>
> Generally a modified Geigel algo or energy based algo are used.<br>
VAD and double talk are totally different problems.<br>
><br>
> I have new
algorithms and want to test them. Unfortunately, I <br>
> don't have enough data, there are out there very expensive databases
<br>
> such as (AURORA...) but don't think they are really suitable for my
tests.<br>
If you are serious about VAD testing, the TIA has a downloadable <br>
database of hand tagged audio. If you are serious about echo <br>
cancellation, you will start by getting your canceller through the G.168
<br>
tests, and then look at the real world test cases that fail. No <br>
expensive databases are needed in either case. I can't imagine a <br>
standard database even being very useful for line echo cancelller
<br>
development. You will probably want to work out the difference between
<br>
VAD and double talk first, though.<br><br>
Steve<br><br>
<br>
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