Alarm device

Details Alarm device Alarm device

1974-03-06

1976-01-20

Pitts, Harold I.

Communications: electrical

Systems

Call station

340408, 340409, 340413, G08B 2600

Patent

active

039342379

ABSTRACT:
An alarm device comprising a first program mechanism at a monitored station and a second program mechanism at a central monitoring station. The program mechanisms have identical shift registers and identical feedback networks and generate binary signals according to a predetermined arbitrary law. A sensing device is connected to the first program mechanism to cause a departure of the binary signals from the predetermined arbitrary law in the presence of a disturbance. The binary signals from the first program mechanism are compared with the output of the second program mechanism, and an alarm is produced if the outputs are different.

REFERENCES:
patent: 3516089 (1970-06-01), Cooper
patent: 3686439 (1972-08-01), Gerard

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