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From: garton@cunixa.cc.columbia.edu (Bradford Garton)
Newsgroups: comp.dsp
Subject: Re: noise cancellation
Message-ID: <1990Jun9.032245.2967@cunixf.cc.columbia.edu>
Date: 9 Jun 90 03:22:45 GMT
References: <595@mercury.iotek.UUCP>
Sender: news@cunixf.cc.columbia.edu (The Daily News)
Reply-To: brad@woof.columbia.edu (Brad Garton)
Organization: Columbia University Electronic Music Center
Lines: 19

In article <595@mercury.iotek.UUCP> garyb@iotek.UUCP (Gary Burrell) writes:
>I was just reminded by a previous article which mentioned to sine waves
>cancelling each other out of an item I heard of a few months ago.  
>
>Apparently Lotus (Sportscars not Speadsheets :)) was working on a noise
>cancillation system for a car, it was something like based on the data
>from a whole bunch of sensors out put a waveform which cancels all the regular
>(repeating) noise ie regular engine noise, road noise etc.
>
>Does any one have any information on this.  I could see all sorts of
>places were a system like this could be used, factories, aircraft etc. 

I remember hearing something about active noise suppression being used at
some power plants in Britain, but this was about 4-5 years ago and
my brain is old and tired now.

Brad Garton
Columbia University Music Department
brad@woof.columbia.edu