Actually, Dan, the carrier freq output level is around 130dBA. But
because the carrier signals are so high (30 and 50kHz, respectively)
the signal attenuates very quickly over distance and cannot be
detected beyond about 20 feet. Additionally, the carrier signal
output is no longer at a constant level. It now follows the amplitude
of the desired audio signal. Typically, those who were affected in
earlier prototypes of the product were usually folks who normally
also suffered from motion sickness. So there was a direct
correlation. However, those technical/physical problems have been
mitigated by the amplitude following technologies that ATC has now
perfected and my wife can stand in front of the panels w/o affect.
Bernie Krause
>I heard Bernie's demonstrations at the NSS workshop last summer, and
>demonstrations at the NSCA show in Dallas last week. They used a
>recording of water trickling, and the sound would seem to come from
>any object the panel was pointed at. Really neat.
>
>Detractors say the ultrasonic level is around 150 dB and gives people
>headaches. What the effect of the ultrasonic sound would be on
>wildlife is unknown.
>
>-Dan Dugan
>
>
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--
Wild Sanctuary, Inc.
P. O. Box 536
Glen Ellen, CA 95442
707-996-6677 tel
707-996-0280 fax
http://www.wildsanctuary.com
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