Apparatus and method for theft detection system having different

Details Apparatus and method for theft detection system having different Apparatus and method for theft detection system having different

1979-06-05

1981-02-03

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1318

Patent

active

042491673

ABSTRACT:
Two different frequencies are generated within an interrogation zone. The receiver portion of the system determines the presence of a predetermined marker tag within the interrogation zone by the sensing and processing of a ratio of sideband signals generated by the interaction of the two different frequencies and the predetermined marker tag. The system is greatly immuned to false alarms due to the method of processing the sensed sideband signals. Falsely generated signals are nulled and subtracted out in the receiver portion of the detection system.

REFERENCES:
patent: 3631442 (1971-12-01), Fearon
patent: 3665449 (1972-05-01), Elder et al.
patent: 3673437 (1972-06-01), Wright
patent: 3697972 (1972-10-01), Brown
patent: 3697996 (1972-10-01), Elder et al.
patent: 3707711 (1972-12-01), Cole et al.
patent: 3747086 (1973-07-01), Peterson
patent: 3790945 (1974-02-01), Fearon
patent: 3820104 (1974-06-01), Fearon
patent: 3990065 (1976-11-01), Purinton et al.

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