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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: rec.aviation,sci.electronics,rec.audio
Subject: Re: Noise-cancelling microphone
Message-ID: <8076@utzoo.UUCP>
Date: Mon, 25-May-87 21:23:41 EDT
Article-I.D.: utzoo.8076
Posted: Mon May 25 21:23:41 1987
Date-Received: Mon, 25-May-87 21:23:41 EDT
References: <1027@mips.UUCP> <689@cod.UUCP> <867@lll-lcc.aRpA> <2849@mit-hermes.AI.MIT.EDU>, <19549@sun.uucp>
Organization: U of Toronto Zoology
Lines: 15

> > Regarding noise-cancelling speakers and mikes, there was an article in the
> > British magazine "New Scientist" a while back about the use of "anti-noise"
> > near large sources of acoustic noise...
> 
> Sounds like New Scientist is putting one over you.  It's
> certainly not this easy (possible ?) to do this in an
> open acoustic field...

No, the idea is for real.  The key is that the speaker is right at the
source, not somewhere out in the acoustic field.  Whether it will ever
work well enough to bother with is not something I'd put bets on, but it
does not appear to be a priori ridiculous.
-- 
"The average nutritional value    Henry Spencer @ U of Toronto Zoology
of promises is roughly zero."     {allegra,ihnp4,decvax,pyramid}!utzoo!henry