Device for detecting unwanted signal combinations of two signal

Details Device for detecting unwanted signal combinations of two signal Device for detecting unwanted signal combinations of two signal

1978-12-14

1981-03-10

Groody, James J.

Communications: electrical

Selective

Having indication or alarm

340642, G08G 1097, B60Q 900

Patent

active

042557380

ABSTRACT:
Apparatus for preventing the simultaneous energization of a pair of traffic lights includes a detection device for monitoring any leakage current in the cables between the traffic lights and a control box. A threshold voltage related to a predetermined level of leakage current to be monitored is coupled to the detection device which actuates an alarm if the leakage current across at least one traffic light exceeds said predetermined level of leakage current.

REFERENCES:
patent: 3786414 (1974-01-01), Dressayre
patent: 3925709 (1975-12-01), Mitchell
patent: 3995173 (1976-11-01), Sibley
patent: 4015150 (1977-03-01), Jones
patent: 4135145 (1979-01-01), Eberle
IBM Technical Disclosure Bulletin, vol. 18, No. 11, Apr. 1976, p. 3545, Bingham, D. G. and Robertson, R. C., "Current Sensor".

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