Sound pattern discrimination system

Communications: electrical – External condition vehicle-mounted indicator or alarm – Transmitter in another vehicle

Patent

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Details

340901, 367197, G08G 100

Patent

active

046252061

ABSTRACT:
A system for the detection and recognition of a particular sound pattern including an initial frequency discrimination circuit comprising either band pass filters of pre-selected frequency or IC phase-locked loop tone decoders. A sequence detection circuit is responsive to the frequency discrimination circuit to successively enable paired timers upon detection of audio tones in the proper sequence and frequency. Out-of-sequence tones disable the circuit. A trigger pulse is then sent to a counter chain and successive pulse must be received by the counter chain in a predetermined time period to actuate a traffic signal control relay. The system used for a traffic signal control further includes a direction differentiation circuit to cause red lights in one direction and green lights in another as determined by the direction of the source of the sound pattern.

REFERENCES:
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patent: 3568144 (1971-03-01), Streb
patent: 3670242 (1972-06-01), McGarvey
patent: 3735342 (1973-05-01), Helliker
patent: 3992656 (1976-11-01), Joy
patent: 4162477 (1979-07-01), Munkberg
patent: 4212085 (1980-07-01), Vaillancour
J. W. Verbeck, "Optics Operate Signals in Emergencies", The American City, Mar. 1967.

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