Article View: sci.physics
Article #7722Re: noise cancellation
From: S Millington
Date: Fri, 17 Mar 1989 12:19
Date: Fri, 17 Mar 1989 12:19
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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
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Path: arc1-ca.pugleaf.net!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