Subject: Re: Sound cancellation technology?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Thu, 26 Dec 2002 14:34:49 GMT
NNTP-Posting-Date: Thu, 26 Dec 2002 09:34:49 EST
Organization: Wightman Internet (wightman.on.ca)
"Phil Allison" wrote in message
> "John Woodgate" wrote in message
> > I read in sci.electronics.design that Lady Liberty
> > wrote (in > .124.0.13>) about 'Sound cancellation technology?', on Wed, 25 Dec 2002:
> > >Fine but not my question. Could someone please answer the actual
> > >
> > >
> > 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 intrudes
> into a bedroom ? This may include barking dogs next to the window, road
> 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 any
> frequency 60 dB or more above ambient with attendant internal
> and varying phase at any point and arriving from any of dozens of sources
> and directions ??
> .................... Phil
You better do some more research before you start calling people names. Some
of them know much more than you do!