[Knack]

"Eeyore" wrote in message
...


Knack wrote:

A major problem with implementing the idea is that there will be no
available electronic schematic diagram for any ANC headphone with which
to
build the system around. I just realized that the device would have to be
hacked by someone with considerable electronic experience having data
about
various ICs in its circuitry. If ICs for the device's signal processor
output and its amplifier input are both proprietary, then I guess I'm
stuck.

That's the EASY part !

The major problem would be writing the software.

Graham

Shouldn't require any new software. The signal processing is all done by the
electronics of the ANC headphone's circuitry. Now must redirect its
anti-noise signal to a larger amplifier than that which drives the
headphone's tiny speakers. All I want to do is replace the ANC headphone's
amplifier and speakers with much larger components. The magnitude of the
amplified anti-noise need only be enough to reach the ears of a person
located only about 10" (25 cm) from a little PC type speaker. How much
anti-noise is that? It should be equal (and opposite) to the magnitude of
noise that can be heard from the center of a fan located no further than 85"
(216 cm) from a sleeper's ear. Remember that the ceiling fan is already
pretty quiet. I just want to get that noise down even further; so that
anyone can sleep through it.