Article View: sci.physics
Article #7801Re: noise cancellation
From: Isaac S Wingfield
Date: Thu, 20 Apr 1989 20:12
Date: Thu, 20 Apr 1989 20:12
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Well, there's been a lot of talk about automobile engine noise cancellation, using some kind of "active muffler". The first thing that occurs to me (and I don't know, even approximately) is HOW MUCH ACOUSTIC POWER ARE WE TALKING ABOUT? Because it'll take pretty much exactly the same amount of "negative power" to make it go away. I bet it's lots of watts, and if you think even *one* acoustic watt isn,t that much, then you've never heard that much coming from a Hi-Fi (especially at low frequency). Isaac isw@cup.portal.com
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!portal!cup.portal.com!ISW From: ISW@cup.portal.com (Isaac S Wingfield) Newsgroups: sci.physics,sci.electronics Subject: Re: noise cancellation Message-ID: <17419@cup.portal.com> Date: 20 Apr 89 20:12:03 GMT References: <723@wucs1.wustl.edu> <7260@fluke.COM> <453@corpane.UUCP> <739@wucs1.wustl.edu> <20031@srcsip.UUCP> <859@prlhp1.prl.philips.co.uk> <482@atlas.tegra.UUCP> Distribution: na Organization: The Portal System (TM) Lines: 13