Re: Frequencies covered by noise cancellation

On 6/7/2009 6:59 PM Mr.T spake thus:

"David Nebenzahl" <nobody@xxxxxxxxxxxxxxx> wrote in message
news:4a2c597d$0$2699$822641b3@xxxxxxxxxxxxxxxxxxxxxxxxxxx
>
Let me guess: it (inverting the signal) would work fine at low
frequencies, but progressively worse at higher frequencies?

*IF* you could provide a 100% accurate signal of the actual sound in the ear
canal,

Well, that's the hard part here, isn't it? But seemingly not impossible (well, not 100%, but close enough).

and reinject a perfectly matched inverted copy in exactly the same spot,

Trivially easy, no? A simple phase inverter oughta do the trick.

with no phase shift whatsoever, then the rest should be very simple
indeed :-) :-)

Since we're talking audio frequencies (< 8 kHz, I'm guessing), shouldn't be a big deal.


--
Found--the gene that causes belief in genetic determinism
.

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