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From: casley@polya.Stanford.EDU (Ross T. Casley)
Newsgroups: sci.physics,sci.math,sci.electronics
Subject: Re: noise cancellation
Keywords: anti-noise
Message-ID: <7714@polya.Stanford.EDU>
Date: 15 Mar 89 06:41:08 GMT
References: <723@wucs1.wustl.edu> <7260@fluke.COM> <1290@wpi.wpi.edu> <7973@ihlpf.ATT.COM>
Sender: Ross T. Casley <casley@polya.Stanford.EDU>
Reply-To: casley@polya.Stanford.EDU (Ross T. Casley)
Followup-To: sci.physics
Organization: Stanford University
Lines: 7

I heard a report on the CBC science show about anti-noise just a few weeks
ago.  Most of the report involved a Canadian or US company whose name I 
don't remember.  It seems that they already have an anti-noise device
which uses headsets and is intended for pilots.  They have a research
contract for developing a replacement for mufflers (silencers, if you
will) for cars.  This prototype system is not very successful, but
they are still working on it.