Energy-responsive intruder detection system

Details Energy-responsive intruder detection system Energy-responsive intruder detection system

1977-12-21

1979-02-20

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340541, 340565, G08B 1900

Patent

active

041410084

ABSTRACT:
A shielded two-wire cable used to transmit signals from one or more remote receivers to a central signal processing unit in an energy-responsive system is simultaneously used to transmit from the signal processing unit to the receivers (a) a signal proportional to the system noise level, (b) a pulsating signal when the system noise exceeds a level indicative of a desired margin of safety, and/or (c) a steady-state signal when an alarm signal is generated by the signal processing unit.

REFERENCES:
patent: 3111657 (1963-11-01), Bagno

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