[Freeswitch-dev] VAD, TALK and NOTALK events

[Steve Underwood]

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