Signal monitoring circuit

Details Signal monitoring circuit Signal monitoring circuit

1977-01-18

1978-08-15

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328 75, 328119, 328130, 307293, H03K 1728

Patent

active

041076168

ABSTRACT:
Signals such as track signals in a railway signalling system are monitored by antiphase sequential application to an enabling input of a control circuit which starts the operation of a timer, providing an output signal only if the control circuit is enabled for a time interval during which all the signals being monitored are present sequentially. Absence of any one of the signals in this interval results in a fail-safe condition, resetting the timer, which then fails to provide an output. In the application to a railway signal monitoring system absence of any one signal would be indicative of occupation of an associated track section, resulting in a `danger` condition being signalled.

REFERENCES:
patent: 3553489 (1971-01-01), Spencer et al.
patent: 3751689 (1973-08-01), Hogg
patent: 3860832 (1975-01-01), Aapro
patent: 3995223 (1976-11-01), Gimber et al.

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