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From: "Phil Allison"
Subject: Re: Sound cancellation technology?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Thu, 26 Dec 2002 17:08:56 +1100
NNTP-Posting-Date: Thu, 26 Dec 2002 16:59:18 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Lady Liberty" wrote in message
> "Bill Shymanski" said, and I quote:
> > OK, maybe I've got a bug in my bonnet this month. Anyway, while waiting
> > for an impulse test to be
> > set up on a large power transformer, I was reading a draft IEEE guide
> > covering noise suppression
> > techniques to be used with large power transformers. One of the methods
> > proposed is active
> > noise cancellation, which apparently gives 10 to 15 dB of suppression of
> > the "tonal" hum associated
> > with power transformers. The draft guide seems to indicate that this
> > technique is commercially
> > available today.
> > Other places I've read of sound cancellation being used is aboard
> > aircraft; some of the commuter jets
> > has speakers throgh the cabin to hold down the noise. Mr. Rutan used a
> > noise-cancelling headset during
> > his round-the-world flight a few years ago.
> I know it's been done in headsets for years, I'm more interested in
> they've gotten it to work in room sized spaces.
** The fag smokin, gun toting tail wagger has got her damn answer
> Lady Liberty - Colorado, U.S.A. http://www.UPAlliance.org
> West Denver area? Libertarian? Objectivist? Chess? Martial arts? Shooting?
> Classic rock? Would like woman shooting partner for Fridays.
** My Gawd - she wants to go shooting in her bedroom ??
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