It's called "destructive interference" if I recall correctly.  I don't
think it would be too effective in such a large area with some random
noise.  I was seriously trying to find a way to build such a system so I
could buy a house I really liked that was next to a freeway, but was
assured by all the engineers that it wouldn't work in that environment.






"Newman, Kevin:" <[log in to unmask]> on 08/23/99 03:36:25 PM

Please respond to "Newman, Kevin:" <[log in to unmask]>

To:   [log in to unmask]
cc:    (bcc: Shawn Gordon/IS/FHM/FHS)
Subject:  Re: HPWORLD 2000 proposal: NO AMPLIFIERS!




I remember seeing a noise cancellation product that Detroit was thinking
about using in their cars that would eliminate the muffler.  It has a
sensor that would pick up the noise wave, and a speaker downline
slightly that was used by a computer that read in the noise, then sent
out a cancellation wave that would make it come out quiet.

I could see a vendor's booth that would cancel out all of the noise from
the other booths and the salesmen could talk in a normal voice the
people stopping by their booth.  I have a feeling that the booth would
be rather crowded, but then again, isn't that what any vendor wants at a
show like that?

Kevin

> -----Original Message-----
> From: Tom Brandt [SMTP:[log in to unmask]]
> Sent: Monday, August 23, 1999 3:22 PM
> To:   [log in to unmask]
> Subject:      Re: HPWORLD 2000 proposal: NO AMPLIFIERS!
>
> At 14:56 8/23/99 -0700, Stan wrote:
> >As an attendee at HP WORLD 99 (and many prior ones), I'd like to
> >make a simple proposal that would make life nicer for all vendor show
> >attendees *and* vendors:
> >
> >   Interex should ban (audio) amplifiers from the show.
> >
> >This means *all* means of amplifying sound!
> <deletia>
>
> I would love to see this.  It would not stop sales types from standing
> in
> the aisles yelling "Free Stuff!" like someone at the Toronto show, but
> it
> would sure help.
>
> It'll never happen, though.
>
> (Failing your proposl, maybe Adager could set up a cone of silence for
> noise-weary conferees.  They could charge admission.)
>
>
>
> Tom Brandt                            Northtech Systems, Inc.
> +1 734-769-5040                     313 N. First Street
> +1 734-769-5498 (FAX)            Ann Arbor, MI 48103