Communications: electrical – External condition vehicle-mounted indicator or alarm – Transmitter in another vehicle
Patent
1984-03-27
1986-11-25
Caldwell, Sr., John W.
Communications: electrical
External condition vehicle-mounted indicator or alarm
Transmitter in another vehicle
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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J. W. Verbeck, "Optics Operate Signals in Emergencies", The American City, Mar. 1967.
Caldwell Sr. John W.
Clark Richard W.
Heim Michael F.
Ptak LaValle D.
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