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From: John Woodgate
Subject: Re: Coming soon to a theatre near you - endless mischief potential
Date: Sun, 13 Oct 2002 07:28:41 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Sun, 13 Oct 2002 09:08:33 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Winfield Hill
wrote (in ) about 'Coming soon to a theatre
near you - endless mischief potential', on Sat, 12 Oct 2002:
>> even ignoring the Popular Science hyperbole ...
> I'm telling you the technique is perfectly viable and even
I'm surprised that the use of high-power density ultrasonic
transmissions is regarded as practical. Unlike cell-phone emissions,
intense ultrasonic energy has well-known inimical effects.
It seems to me that the technique has certain features not easily
produced by other techniques. But it seems extremely inefficient.
>especially at frequencies above 100kHz and longer
> distances. That said, you'll not rope me into defending the
> Popular Science version or their claims. :-) But this
> "field" does seem to draw charlatans out of the woodwork.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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