Path: utzoo!attcan!uunet!cs.dal.ca!iotek!garyb
From: garyb@iotek.UUCP (Gary Burrell)
Newsgroups: comp.dsp
Subject: noise cancellation
Message-ID: <595@mercury.iotek.UUCP>
Date: 8 Jun 90 10:44:18 GMT
Reply-To: garyb@iotek.UUCP (Gary Burrell)
Organization: IOTEK Inc
Lines: 31

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 know noise cancelation is theoretically possible but how does one 
deal with it in reality.  ie ensuring the output signals are in the opposit
phase from the input, delay due to distance traveled (does this make it 
feasable only for very small areas.)  

			Inquiring minds want to know

					Gary R. Burrell



			<<<<<<******>>>>>>
Gary R. Burrell, Iotek Inc,     |*| E-Mail: garyb@iotek.uucp	|*| 
1127 Barrington St., Suite 100, |*| Fax:    (902)420-0674	|*|   
Halifax, N.S., B3H 2P8, Canada  |*| Phone:  (902)420-1890	|*| 

Damm it Jim 
  I'm a Doctor not a Computer Scientist!
              
             *************************************