Coded acoustic alarm transmitter/receiver system

Details Coded acoustic alarm transmitter/receiver system Coded acoustic alarm transmitter/receiver system

1983-04-11

1986-07-22

Swann, III, Glen R.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

340521, 340531, 340574, 34082574, G08B 1900, G08B 1308, G08B 1314, G08B 1706

Patent

active

046023577

ABSTRACT:
The coded acoustic alarm transmitter/receiver system includes a transmitter for selectively providing both an audible alarm in the audio frequency range and a silent alarm in the ultrasonic frequency range. These alarm signals may be provided by a plurality of signals of different frequencies transmitted simultaneously in either the audio or ultrasonic frequency ranges. Receiver units are tuned to receive specific frequencies from a specific transmitter or group of transmitters.

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