[Ron Capik[_2_]]

wrote:
On Jun 5, 5:08 pm, "Richard Crowley" wrote:
dpierce wrote ...

"Richard Crowley" wrote:
The fundamental theory is the same. But reconstructing
a cancellation signal at higher frequencies requires
more processing horespower (i.e. faster processors).
More "horsepower?" In the limiting case, all the
horsepower that's needed is inverting the phase
of the signal.
At what sampling rate?

Irrelevant. Take a signal, run it through ANYTHING
that inverts the phase. A transformer, an inverting
op amp. No discrete sampling, no DSP of ANY
kind required.
However, the driver/ear canal response and microphone
response need to match exactly (or at least be damn
close) for that to work over a wide band.


Later...

Ron Capik
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