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You're not dreaming... (archive)
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Posted by Karl in San Diego on April 17, 2000 at 23:55:48:

In Reply to: Re: Exhaust system Tuesday--Advice today (DELK) posted by Kevin B. on April 16, 2000 at 21:33:22:

I think that Yamaha was the first to use it on production bikes.

http://www.activebike.com/400page/exup.htm

Note the date (May 1988) It was known as EXUP. Ferrari uses it on the 550 Maranello.

I'm more interested in dynamic noise cancellation. I saw a TV story on Lotus' development of a system which let them run open pipes that ran silently. They did this by actively sampling the "noise" waves of the exhaust and reproducing them with a loud amplifier 180 degrees out of phase. The result was an electro/acoustically muffled exhaust. Even cooler was when the dialed the 4 cylinder turbo motor to sound like a sampled 12 cylinder Ferrari motor. Anyone else know anything about this technology?

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