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From: donald@warwick.UUCP
Newsgroups: rec.aviation,sci.electronics,rec.audio
Subject: Re: Noise-cancelling microphone
Message-ID: <537@ubu.warwick.UUCP>
Date: Tue, 26-May-87 16:54:35 EDT
Article-I.D.: ubu.537
Posted: Tue May 26 16:54:35 1987
Date-Received: Fri, 29-May-87 00:41:53 EDT
References: <1027@mips.UUCP> <689@cod.UUCP> <867@lll-lcc.aRpA> <2849@mit-hermes.AI.MIT.EDU> <19549@sun.uucp>
Reply-To: donald@warwick.UUCP (Tim Bissell)
Organization: Computer Science, Warwick University, UK
Lines: 26
Keywords: anti-noise
Xref: utgpu rec.aviation:1394 sci.electronics:675 rec.audio:1487

With regards to anti-noise, I read a very detailed article about it in
"Chartered Mechanical Engineer" (the mag. of the British Institute of
Mechanical Engineers).  The article was by some researchers at Essex
University (are they on the net? anyone like to confirm?) and described
various projects it had been used in.  In fact there research was more
general than anti-noise; it was anti-vibration -- one of their experiments
was with resilient mountings for big diesel engines (like those in ships)
which took the form of hydraulic rams, a bit like active suspension for
cars.

One point which might convince the sceptics, their work was mainly to
do with cancelling cyclic noises (i.e. a diesel engine at constant rpm)
so they could use a computer to predict what the noise would be like based
on what it had been like before.

Hope that casts a bit of light... I read it a loooong time ago.

 


-- 
/*
 * Tim Bissell ... the six million donald man ...
 * 			           donald@uk.ac.warwick
 *    {..seismo}!mcvax!ukc!warwick!donald
 */