Intrusion monitoring system

Details Intrusion monitoring system Intrusion monitoring system

1997-09-08

1998-08-04

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340539, 340692, G08B 1300

Patent

active

057900248

ABSTRACT:
A single or a plurality of like transmitters are remotely positioned from a single receiver. Each one of the transmitters has an infra-red sensor that when activated by the heat of a moving object transmits a first single pulse to set the AGC of the single receiver and then when the AGC level is established transmits a series of coded identification pulses at substantially the same gain level as the first pulse to the receiver. The coded pulses identify one of a plurality of channels in the receiver that contain a pre-recorded message relating to the transmitting transmitter. When a channel is selected that pre-recorded message is audible produced by the receiver. Typically, the message will announce the location of the transmitting transmitter to a listener which indicates that there is an intruder detected at the transmitter location.

REFERENCES:
patent: 3848231 (1974-11-01), Wootton
patent: 4692742 (1987-09-01), Raizen et al.
patent: 5499013 (1996-03-01), Konotchick
patent: 5570079 (1996-10-01), Dockery
patent: 5677673 (1997-10-01), Kipnis
patent: 5686886 (1997-11-01), Stensney

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