Pulse code modulation responsive alarm system

Details Pulse code modulation responsive alarm system Pulse code modulation responsive alarm system

1979-10-25

1981-04-07

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340 63, 340568, 340695, 455 26, G08B 310

Patent

active

042609828

ABSTRACT:
A system for producing an alarm whenever the distance between a transmitter and a receiver exceeds a predetermined distance. The transmitter includes circuitry for generating a signal having a preselected pulse code modulation pattern. The receiver includes circuitry for responding to the particular pulse code pattern and for sounding an alarm when the signal from the transmitter is so weak that pattern is not received.

REFERENCES:
patent: 3157871 (1964-11-01), Umanoff
patent: 4013994 (1977-03-01), Ragano et al.

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