False triggering prevention circuit

Details False triggering prevention circuit False triggering prevention circuit

1974-11-21

1976-03-16

Dixon, Harold A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307232, H04B 103

Patent

active

039449343

ABSTRACT:
A falsing protection circuit for preventing the false triggering of an alarm system or the like by extraneous randomly occurring pulses includes a pulse extractor circuit that is nonresponsive to a predetermined number of initial pulses in a pulse train but responds to subsequent pulses in the train, thereby making the alarm system responsive only to pulse trains containing numerous pulses of the type encountered during actual alarm conditions. Pulse shaping circuitry is included in the pulse extractor circuit for extending all short pulses to a minimum length and for passing all pulses longer than the minimum length at their true length. This effectively prevents a burst of short pulses occurring during the minimum length interval from falsely triggering the system.

REFERENCES:
patent: 2894127 (1959-07-01), Stilwell
patent: 3518555 (1970-06-01), Konotchick
patent: 3575215 (1971-04-01), Boddy
patent: 3611158 (1971-10-01), Strathman
patent: 3754222 (1973-08-01), Eisenberg

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