Mark writes:
> Is it technically not feasable, meaning that a room is too large to do
> noise cancelling in, or not feasable from the linux software
> prespective?

Noise-canceling headphones only cancel noise right at the headphones so
the size of the room is not relevant.  Even so, dedicated DSP hardware
is required.  A process running under Linux cannot possibly be fast
enough.  It would have to process at least two samples per cycle of the
highest frequency of interest.  It doesn't matter how powerful your
processor is: the latency would kill you.
-- 
John Hasler


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