Coded acoustic alarm transmitter/receiver system
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United States of America Patent
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-
Jul 22, 1986
Issued Date -
N/A
app pub date -
Apr 11, 1983
filing date -
Feb 12, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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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