Frequency modulation signalling system employing an electrical f

Details Frequency modulation signalling system employing an electrical f Frequency modulation signalling system employing an electrical f

1976-04-06

1978-08-22

Griffin, Robert L.

Railway switches and signals

Electric actuation

Control circuits

246 30, 325 37, 325 64, 330109, 331113R, 343225, H04B 100, H04B 724

Patent

active

041092058

ABSTRACT:
An electrical fail-safe filter consists of a transistor amplifier with a frequency-selective positive feedback circuit such as a resistance capacitance network shunting the collector and emitter of the transistor such that failure of any component of the feedback circuit results in a reduction in the overall gain of the stage. The filter is described in its application to a fail-safe receiver for a railway signalling system.

REFERENCES:
patent: 2983876 (1961-05-01), Tongue
patent: 3264572 (1966-08-01), Lefferts
patent: 3366961 (1968-01-01), Goldstein
patent: 3725802 (1973-04-01), Darrow
patent: 3792376 (1974-02-01), Pederson et al.

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