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From: jwm@stdc.jhuapl.edu (Jim Meritt)
Newsgroups: sci.physics,sci.math,sci.electronics
Subject: Re: noise cancellation
Keywords: anti-noise
Message-ID: <3338@aplcomm.jhuapl.edu>
Date: 10 Mar 89 14:09:09 GMT
References: <723@wucs1.wustl.edu>
Sender: news@aplcomm.jhuapl.edu
Reply-To: jwm@aplvax.UUCP (Jim Meritt)
Organization: JHU-Applied Physics Laboratory
Lines: 12


 have heard of this, but applied to a pair of earphones for jet pilots.
They would receive the external sound, and generate the counter wave for inside
the headset.  The radio communications would come in the same line, but now
could be easily heard.  In demo's (public) quite a few db's were 
effectively cancelled - I understand marketting is also getting them
lined up for expensive sterio sets to shut down the background noise so the
music would be clearer...



The above was test data, and not the responsibility of any organization.