Re: Ultrasonics


Subject: Re: Ultrasonics
From: Aki Pasoulas (pasoulas@yahoo.co.uk)
Date: Fri May 14 2004 - 07:52:22 EDT


HSS has been mentioned in the past in cecdiscuss: sounds of our
hearing range are converted into ultrasounds to make them highly
directional, then shifted back into the audible range of
hearing.

Recently, I read an interview of R.G. Boire (co-founder of the
Centre for Cognitive Liberty and Ethics in California) in
NewSientist, about freedom of thought that mentioned hypersonic
sound. HSS generating devices operate by processing the
original sounds converting them into ultrasonic signals, which
are then sent into the air, creating pressure waves. Since we
cannot hear the ultrasonic sound, we only hear the new sounds
that are formed by the non-linear action of the air. The
resulting sound is transmitted through a thin virtual column.
(More on HSS systems: http://www.atcsd.com/tl_hss.html)

Boire is (rightly) concerned about mind control using these
beams of sound, although I can see also a great creative
potential. Unfortunately, HSS is already used to deliver
marketing messages: American Technology Corporation is
installing such devices in soda machines in Tokyo. The sound is
inaudible, until you walk into its narrow path; then you are
supposed to "hear the sound of ice cubes dropping into the glass
and the soda making that 'pssst' can-opening noise". Very
invasive, almost scary...
(Anyone knows about EA works/sound installations using HSS?)

Aki

---
http://www.geocities.com/pasoulas
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--- Coryn Smethurst <corynrrsmethurst@tiscali.co.uk> wrote: > Does anyone know of any works using ultra-sound which has been > shifted into > the audible range of hearing. Just curious as apart from > Alvin Lucier's use > of bat detectors I don't really know of any. > > crrs

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