Receiver for a coded electronic security system

Details Receiver for a coded electronic security system Receiver for a coded electronic security system

1975-07-31

1977-06-28

Habecker, Thomas B.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

325349, 340171PF, 340224, 340412, H04B 116

Patent

active

040328481

ABSTRACT:
The present invention pertains to a receiver for a coded electronic security system which includes a plurality of independent transmitting devices each of which generates a pulse coded RF signal when activated. The receiver demodulates the pulse coded signal and separates from the demodulated signal a high frequency square wave unique to each transmitter in the system and a low frequency square wave common to each of the transmitters in the system. The receiver determines the frequency of the high frequency square wave, verifies that the low frequency square wave is the one appropriate for the system, and then indicates which of the transmitters in the system has been activated.

REFERENCES:
patent: 3694757 (1972-09-01), Hanna
patent: 3769593 (1973-10-01), Williams
patent: 3855575 (1974-12-01), Leuschner
patent: 3898574 (1975-08-01), Allen

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