[Asterisk-Users] Echo

[Roy Sigurd Karlsbakk]

> > i4l uses the modem.conf file, not the zapata.conf file.
> > and no, it does not echo cancelation, i'm waiting for Mark
> > to seperate it out from the zap driver, like he did for the
> > dsp functions.
>
> Unfortunately, echo cancellation is not as easy to pull out as the dsp
> routines.  The problem is that in order to use an echo canceller like
> "mec" and "sec" varieties, you must have very good correlation between
> signal transmitted and signal received.  In other words, you need to know
> that "this byte/short in this receive buffer was the one that we received
> exactly when the physical device was transmitting that byte/short in that
> transmit buffer".  That's why echo cancellation is done in-kernel, and in
> zaptel, because we have that very correlation.

...so for this to be moved to CAPI, it needs to be done in kernel space as 
well?

-- 
Roy Sigurd Karlsbakk, Datavaktmester
ProntoTV AS - http://www.pronto.tv/
Tel: +47 9801 3356

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