[Freeswitch-dev] VAD, TALK and NOTALK events

[KMTDBOURSE]

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?

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 http://www.vocal.com/ I see no database 
there, just a doc sheet about recommendation which is nor rigorous 
neither of any help.

  if u have any direct link for such databases I would appreciate it very much.

best


Zelda


At 00:44 20/02/2008, you wrote:
>KMTDBOURSE wrote:
> >
> >         Know that
> >
> >
> >   (OSLEC)
> >
> > pretty well. Wanna test new algorithms but need wav data. Echo Cancel
> > is also still under research process, VAD is part of a good echo
> > canceller as it freezes the algo processing in case of double-talk.
> > Generally a modified Geigel algo or energy based algo are used.
>VAD and double talk are totally different problems.
> >
> >          I have new algorithms and want to test them. Unfortunately, I
> > don't have enough data, there are out there very expensive databases
> > such as (AURORA...) but don't think they are really suitable for my tests.
>If you are serious about VAD testing, the TIA has a downloadable
>database of hand tagged audio. If you are serious about echo
>cancellation, you will start by getting your canceller through the G.168
>tests, and then look at the real world test cases that fail. No
>expensive databases are needed in either case. I can't imagine a
>standard database even being  very useful for line echo cancelller
>development. You will probably want to work out the difference between
>VAD and double talk first, though.
>
>Steve
>
>
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