Re: [microsound] the power of sound

[Kyle Klipowicz <kyleklip@xxxxxxxxx>]

Very nice collection!

~Kyle

On 10/21/06, { brad brace } <bbrace@xxxxxxxxxx> wrote:
>
>
> Acoustic Bullets: High-power, very low-frequency waves
> emitted from one- to two-meter antenna dishes. Results in
> blunt-object trauma. Effects range from discomfort to death.
>
> Curdler Unit: A device that is plugged into a sound system
> to produce a shrill, shrieking, blatting noise.  It is used
> to irritate and disperse rioters and has a decibel range
> just below that of the danger level to the human ear. It is
> used in night operations to produce a "voodoo" effect and
> breaks up chanting, singing, and clapping.
>
> Infrasound: Very low-frequency sound that can travel long
> distances and easily penetrate most buildings and vehicles.
> Long-wavelength sound creates biophysical effects: nausea,
> loss of bowels, disorientation, vomiting, internal-organ
> damage, or death may occur.  By 1972 an infrasound generator
> had been built in France.  When activated it made the people
> in range sick for hours.
>
> Squawk Box: Crowd-dispersal weapon field-tested by the
> British Army in Ireland in 1973. This directional device
> emits two ultrasonic frequencies that when mixed in the
> human ear become intolerable. It produces giddiness, nausea,
> or fainting. The beam is so small that it can be directed at
> specific individuals in a riot situation.
>
> Mosquito Crowd Dispersal System:
>
> Whilst most young people are law-abiding and cause no
> problems, the presence of certain groups of teenagers can
> often discourage genuine customers from entering shops and
> other premises with a subsequent detrimental effect on
> turnover and profits. This type of anti-social behaviour has
> become the biggest threat to private property over the last
> decade and there has been no effective solution until now.
> The Mosquito ultrasonic deterrent provides the first
> practical solution to the eternal problem of unwanted
> gatherings of youths and teenagers in shopping malls and
> other retail areas.
>
> The Mosquito generates a high frequency sound that is
> audible only to teenagers. It is completely harmless even
> with long-term use and rarely affects older people as it
> relies on a medical phenomenon known as presbycusis, or age
> related hearing loss. This begins after the age of 20 but is
> usually significant only in persons over 65. It first
> affects the highest frequencies (18 to 20 kHz), which is
> where Mosquito operates.
>
> With an effective range of between fifteen and twenty
> meters, field trials have shown that teenagers are acutely
> aware of the Mosquito and usually move away from the area
> within just a couple of minutes.
>
>
> bbs: brad brace sound:
> http://69.64.229.114:8000
> http://bbrace.net/undisclosed.html
>
>
>
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>


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