[Homeroast] Noise canceling headphones

David Liguori liguorid at albany.edu
Fri Jul 2 10:32:24 CDT 2010

On 7/2/2010 11:13 AM, raymanowen at gmail.com wrote:
> Just what I was thinking- the jet jocks on the flight line risked having
> their hearing destroyed by the compressor whine of taxiing aircraft, except
> for the Mickey Mouse ear protectors they wore. I wish I had been able to
> acquire a pair for the pistol range, with their>30 dB reduction.
> My experience with the active noise-canceling hearing protectors is that
> they tend to "motorboat," or oscillate at very low frequencies if the (-)
> feedback amplitude was too high. They might work if the (-) feedback can be
> notched or the pass band peaked in the LF "pop" and the HF "crack" range. If
> you're going to want active noise suppressors, take it all the way.
> Cheers, Mabuhay -RayO, aka Opa!
So you want to add a couple of poles to the transfer function?  Hope you 
can get it past the Greeks and Italians.

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