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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