Xref: utzoo sci.physics:6317 sci.math:6069 sci.electronics:5583
Path: utzoo!attcan!uunet!mcvax!ukc!warwick!phupp
From: phupp@warwick.ac.uk (S Millington)
Newsgroups: sci.physics,sci.math,sci.electronics
Subject: Re: noise cancellation
Keywords: anti-noise
Message-ID: <258@poppy.warwick.ac.uk>
Date: 17 Mar 89 12:19:56 GMT
References: <723@wucs1.wustl.edu> <3338@aplcomm.jhuapl.edu>
Reply-To: phupp@warwick.ac.uk (S Millington)
Organization: Oh well!
Lines: 13


   This is now being introduced for gun users. The headphones cut out noise
above a certain level, by anti-noise, while still letting lower level noise
through to the users ears. This allows converstions to carry on without
removing the headphones. Cancelling external noise in stereo headphones
appears only to need a mic on the outside of the headphones to pickup the
external noise which is then fed to the appropriately phased anti-noise
circuits.

Stuart Millington.
University Of Warwick.(Don't let my ideas ALTER their reputation)
__JANET  phupp@UK.ac.warwick.cu
__OTHERS phupp@UK.ac.warwick.cu