On Mon, 2006-02-06 at 21:46 +1100, James Harper wrote: > Just an enquiring mind wanting to know, but how is a hardware solution > different to a software solution? The echo cancellers in the Digium > hardware presumably just use the same sort of algorithms as the software > versions, so it is just that they are dedicated and perform better, that > they are closer to the source of the echo, or some other thing that I've > overlooked?
Generally they use the same algorithms, I do not know if they do infact use exactly the same or not. There was a presentation that I missed most of from Sangoma at ETEL that talked about this. They werent specifically talking about their echo cancelers when I walked in, but hardware vs software in general. I wish that I had heard more of it. The parts I did hear ended up being the buffering that is done to detect echos and how that varies somewhat. google might be of help finding a comparison between the two and why one might be better than the other. Again, I know Sangoma is a sore subject with some on this list, but the echo cancelation stuff I heard while presented by a Sangoma employee was not Sangoma specific, although it did include some research into different hardware/software based cancelers. -- Trixter http://www.0xdecafbad.com Bret McDanel UK +44 870 340 4605 Germany +49 801 777 555 3402 US +1 360 207 0479 or +1 516 687 5200 FreeWorldDialup: 635378 http://www.sacaug.org/ Sacramento Asterisk Users Group
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