From: John Larkin
Subject: Re: Coming soon to a theatre near you - endless mischief potential
Date: Sat, 12 Oct 2002 10:17:16 -0700
Organization: Posted via Supernews, http://www.supernews.com
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On Sat, 12 Oct 2002 17:40:18 +0100, John Devereux
>>On 12 Oct 2002 06:13:17 -0700, firstname.lastname@example.org (milne_v) wrote:
>>>We've heard hypersonic sound. It could change everything.
>>>by Suzanne Kantra Kirschner
>>> It's the most promising audio advance in years, and it's coming this
>>>fall: Hypersonic speakers, from American Technology (headed by the
>>Total, silly nonsense. Air is not a nonlinear medium, at least at
>You're probably right... but what about the inside of your
I believe that eardrums are slightly nonlinear (I bet John W knows
something about this) so might serve as a mixer/detector for very high
levels of two-tone ultrasonics. But even 30 KHz is hard to make into a
tightly directional beam (as in the lifeguard example) and the levels
would certainly have to be high, certainly dangerous, to produce even
a barely audible response. Besides, the invention claims that the
sonics are created in air, and that the sonics are somehow confined by
the ultrasonics, and doesn't lose volume for 150 yards. Stupidity.
Popular Science prints this sort of impossible crap all the time.