Control signal coding and detection in the audible and inaudible ranges
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United States of America Patent
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-
Oct 17, 2000
Grant Date -
N/A
app pub date -
Feb 20, 1996
filing date -
Feb 20, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A coded siren sound generator and a corresponding detector module are provided which allow uniquely coded tone patterns generated by the coded siren to be detected and processed such that only specific sirens will activate the detector module. In one embodiment, only a few codewords are sent by the transmitter. The receiver looks for the occurrence of one or more of these selected codewords and takes a predetermined action based on programming of the detector. The system may operate at audible or ultrasonic frequencies. In accordance with a further embodiment, audio (either audible or ultrasonic) 'packets' are sent by the transmitter These packets contain sufficient information to uniquely identify the vehicle sending the packet and allow the vehicle to send commands and data to the detector. The commands and data may be for purposes such as requesting emergency pre-emption for a left turn at an intersection, requesting straight ahead pre-emption, etc.
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