Just a comment: You should not interrupt at 1ms intervals.
For example:
The interrupt handler must respond within 1ms for transmission of
data. This
contradicts to block-processing of sound which might take more than
1ms.
The result is that Zaptel will not be able to do echo cancelling from
the
interrupt thread. Then Zaptel needs another thread that pre-computes
the
echo, which either adds more delay in the transmission path, or
computes the
estimated echo too often.
Zaptel is in other words not designed for efficiency.
No comment :-)
If you don't know what a fast echo canceller looks like, have a look
here:
http://www.turbocat.net/~hselasky/isdn4bsd/sources/new_ec/
I don't have a lot of echo canceler design experience, but after
glancing at your code, I have this question. What are you doing an FFT
for in your echo canceler? I can see why you'd be concerned with not
finishing block processing within 1ms if you're doing that in your echo
canceler.
Matthew Fredrickson
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