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Re: Little OT : Software for Active Noise Cancelling or Reduction

On Thu, Aug 06, 2009 at 09:39:18AM -0500, John Hasler wrote:
> 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.

Considering audio voice processing is done at the host anyway, why not
also cancel acoustic echo?


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