From: "Phil Allison"
Subject: Re: Sound cancellation technology?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Fri, 27 Dec 2002 10:06:30 +1100
NNTP-Posting-Date: Fri, 27 Dec 2002 09:56:58 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Thinker" wrote in message
> "Phil Allison" wrote in message
> > "John Woodgate" wrote in message
> > news:Kuf3NQAhIsC+EwTV@jmwa.demon.co.uk...
> > > I read in sci.electronics.design that Lady Liberty
> > > wrote (in
> > .124.0.13>) about 'Sound cancellation technology?', on Wed, 25 Dec
> > > >Fine but not my question. Could someone please answer the actual
> > question?
> > > >
> > > >
> > > OK, it is almost certainly possible, but would be very costly, not
> > > necessarily in terms of equipment but in the custom DSP software
> > > required.
> > ** Really ?
> > How do you cancell by a factor of 60 dB *any* noise that
> > into a bedroom ? This may include barking dogs next to the window,
> > traffic noise of all sorts at close range, aircraft noise, neighbours
> > activity impacting the floor/ceiling interface with deep, powerfull sub
> > sonics etc, etc.
> > These create sudden and disturbing noise in the room at almost
> > frequency 60 dB or more above ambient with attendant internal
> > and varying phase at any point and arriving from any of dozens of
> > and directions ??
> > .................... Phil
> You better do some more research before you start calling people names.
> of them know much more than you do!
** Hmmm, looks like an anonymous threat.