AnswerGuru Musings

Hypersonic Sound "Flashlight"

WOW! Woody Norris and American Technology have introduced a device called Hypersonic Sound.

Purpose: To deliver sound to a certain location....kind of like a focused speaker. Apparently he can point the device at you from up to 150 yards away and transmit the sound to you, but if you step out of the beam, you won't hear a thing. Amazing.

How does it work? A piezoelectric transducer (read fancy speaker) emits sounds at very high frequencies - about the 20khz that we can hear. These high frequencies don't spread out as they travel through the air. Yet, they still interact with the air to induce a set of ultrasonic waves - that combine with the original waves and make an audible signal. All focused into a beam.

Current price: $600

Stock quote: ATCO

Longer article at Popular Science

Posted by answerguru at November 15, 2002 12:51 PM