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From: metcalf@marc.ircam.fr (Chris Metcalf)
Newsgroups: sci.physics,sci.math,sci.electronics
Subject: Re: noise cancellation
Keywords: anti-noise
Message-ID: <506@ircam.UUCP>
Date: 20 Apr 89 19:18:38 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>
Sender: news@ircam.UUCP
Reply-To: metcalf@marc.UUCP (Chris Metcalf)
Organization: l'Institut de Recherche et de Coordination Acoustique-Musique
Lines: 14

In article <859@prlhp1.prl.philips.co.uk> paszkows@prlhp1.UUCP () writes:
>just such a problem, and the conclusion drawn was that an array of speakers
>totally enclosing the person was necessary to achieve the noise cancellation. As
>you can imagine this is not very practical in a motor vehicle.

Isn't there an ambiguity as to what 'enclosing' means, i.e., doesn't an array
of speakers surrounding the car enclose the outside world as much as it
encloses the car?  (Cf. _So Long, And Thanks For All The Fish_).  More 
practically, doesn't surrounding the muffler with speakers work just fine?



Chris Metcalf -- l'Institut de Recherche et de Coordination Acoustique-Musique
metcalf%ircam@uunet.uu.net / ...!inria!ircam!metcalf / metcalf@ucbingre.bitnet