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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 14:14:17 +1100
NNTP-Posting-Date: Thu, 26 Dec 2002 14:04:44 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
wrote in message
> In sci.electronics.design Phil Allison wrote:
> > "Lady Liberty" wrote in message
> > news:firstname.lastname@example.org...
> >> How far along has sound cancelation technology come in the last 10
> >> Can they use it to completely silence a bedroom area for sleeping, yet?
> > ** No need to silence the whole room - just the area near one's head
> > would do.
> > It is still much cheaper to use sound proofing than
> > and that DOES cover the whole room.
> Though soundproofing only the ears is cheaper still.
** That, unfortunately does NOT work.
Sound enters the head via the nose and mouth as well as the ear
canal, also through the bones of the skull.
Any sound below a few hundred Hz goes around ear plugs like they are
not there - in fact ear plugs make low frequency sound seem worse since any
masking effects from mid and highs are gone.
Been there, done that with 50 Hz tones caused by compressor motors
bolted onto a common wall.
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