While I agree that the Sangoma cards are good, your statement that "software
echo cancellation doesn't really work" is ... incorrect.
Software echo cancel works very well if it's done correctly, if your audio
levels are where the canceller's "sweet spot" is, and the tail is not longer
than the longest tail that the canceller's designed to work with. Most
people don't attempt to set their stuff up correctly and they achieve poor
results and blame it on the software.
Well, I couldn't make the software echo canceler totally eliminate the
echo. It did reduce it, but not enough. I tried enabling/disabling
various algorithms, tweaking gains, thresholds, taps, etc, etc, etc...
The software approach is great in theory, but the hardware echo canceler
"just works", without configuring anything - in my experience, anyway.
I'm curious though: did you find that the software approach totally
eliminated echo in typical situations?
- Mike
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