Security system with interference detection

Details Security system with interference detection Security system with interference detection

1986-07-23

1988-04-12

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340536, 455 1, 455 67, 455 63, 375 99, 342 14, G08B 108, H04Q 700

Patent

active

047377712

ABSTRACT:
A security system having one or more sending units for transmitting an electromagnetic signal representative of a condition such as fire, smoke, intrusion, battery condition, an emergency or other condition to a central receiving unit. Upon reception of an electromagnetic signal, the receiving unit provides an electromagnetic carrier detect signal to a microprocessor. A software timer within the microprocessor keeps track of the time over which the carrier is detected. If the carrier detection continues for a time longer than about 20 seconds, then a jamming indication signal is provided to one or more outputs. While the system is being jammed, alarms are ignored thus avoiding false alarms due to interference.

REFERENCES:
patent: 3431496 (1969-03-01), O'Donnell
patent: 4357709 (1982-11-01), Butler et al.
patent: 4434506 (1984-02-01), Fujiwara et al.
patent: 4524446 (1985-06-01), Sun et al.

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