Apparatus and method of broadcasting audible sound using ultraso

Details Apparatus and method of broadcasting audible sound using ultraso Apparatus and method of broadcasting audible sound using ultraso

1998-05-01

2000-04-18

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Transmitter systems

Animal control

367137, 367134, H01M 2902, H04R 2500

Patent

active

060523360

ABSTRACT:
An ultrasonic sound source broadcasts an ultrasonic signal which is amplitude and/or frequency modulated with an information input signal originating from an information input source. If the signals are amplitude modulated, a square root function of the information input signal is produced prior to modulation. The modulated signal, which may be amplified, is then broadcast via a projector unit, whereupon an individual or group of individuals located in the broadcast region detect the audible sound.

REFERENCES:
patent: 5159703 (1992-10-01), Lowery
patent: 5889870 (1999-03-01), Norris
"In The Audio Spotlight" by David Schneider; Scientific American, News and Analysis (Oct. 1998); pp. 40-41.

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