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Active mufflers

To: british-cars@autox.team.net
Subject: Active mufflers
From: "Daren Stone, D2 Mfg. Engr. C5/6, 5-9521" <DSTONE@SC9.intel.com>
Date: Thu, 6 Jan 94 07:32:50 PST
     Tim Mullen writes:

Along the topic of active suspension...

I saw a show on the Discovery channel, or The Learning Channel (or
some such cable channel) the had an "article" about Lotus's Active
sound canceling system.  The system used sensors placed around the
interior of the car to "listen" to the noise, then cancel the noise
(engine sounds, air conditioner, etc.) by generating more "noise" 180
degrees out of phase. The system was designed to eliminate the buzz of
small 2, 3, or 4 cylinder econo box cars and engines; -- to make them
more acceptable.

     >>  I  have also read about this technology being used
     for "electronic mufflers" that can cancel out
     the exhaust note. The environmental benefits are
     obvious, but the notion of a silent supercar (or any
     car really) is not only aesthetically odd, it's
     downright eerie (at least to me !). 
          If Redcar didn't make the sound she does whilst
     being rung out, she wouldn't be nearly as much fun to
     fling .... ;-)

               cheers-
                      daren


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