Re: noise cancellation

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Article #7802

#7802

From: Ted Goldstein
Date: Tue, 25 Apr 1989 14:59

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In article <17419@cup.portal.com> ISW@cup.portal.com (Isaac S Wingfield) writes:
>Well, there's been a lot of talk about automobile engine noise
>cancellation, using some kind of "active muffler".

All this talk about cancelling the muffler noise of a car has reminded me
of a study of highway noise I once read (sorry I don't remember where).
The conclusion they arrived at was that most noise coming from 
a highway is from car TIRES on the road surafce, and not engine noise.

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!bu-cs!purdue!mentor.cc.purdue.edu!mace.cc.purdue.edu!du4
From: du4@mace.cc.purdue.edu (Ted Goldstein)
Newsgroups: sci.physics,sci.electronics
Subject: Re: noise cancellation
Message-ID: <2283@mace.cc.purdue.edu>
Date: 25 Apr 89 14:59:03 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> <17419@cup.portal.com>
Reply-To: du4@mace.cc.purdue.edu (Ted Goldstein)
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