On 1/28/2017 4:55 PM, Electric Comet wrote:

i guess that shop noise from machines is mostly white noise

Definitely not. There's the usually tonal hum of the motor, the whine of
the blade, etc.

but with compute power as it is i wonder if it is possible
to sample the white noise and cancel fast enough so that i
cannot hear it

Unless you're talking about doing this within headphones (which exist),
there would be problems with phase and delay. Your head isn't
stationary. If you're imagining an "anti-noise" generator somewhere in
you're shop it would somehow have to compute the exact signal to produce
that would cancel out the tool sound *where your ears are*, which is not
only a moving target, but *two* moving targets. This is not to mention
the thousands of paths the sound would take as it reflects off the
various surfaces in your shop.

I find the garden variety 3M ear protectors to be more than sufficient.

or at least cancel most of it by analyzing the predominant noises
based on previous samples










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