Optical signal transmitter

Details Optical signal transmitter Optical signal transmitter

1978-10-20

1980-11-18

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455117, 455127, 307 10BP, 307 10LS, 307157, 320 9, 340 34, H04B 900, H04B 104, H02J 902, H01M 1044

Patent

active

042349672

ABSTRACT:
An optical signal transmitter for use by priority vehicles for remotely controlling traffic signals, including a light source which is flashed at a controlled repetition rate to transmit an optical signal to a receiver located at the traffic intersection. Circuitry associated with the light source includes a comparator network for disabling an electrical energy supply in the event of certain predetermined operating conditions.

REFERENCES:
patent: 2936387 (1960-10-01), Steele
patent: 3550078 (1970-12-01), Long
patent: 3904948 (1975-09-01), Earle

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