Anti-shoplifting security system utilizing a modulated transmitt

Details Anti-shoplifting security system utilizing a modulated transmitt Anti-shoplifting security system utilizing a modulated transmitt

1997-06-18

1999-05-04

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1314

Patent

active

059008164

ABSTRACT:
The present invention relates to a method and apparatus for detecting the presence of a soft magnetic marker in an interrogation zone. This invention utilizes a modulated transmitter carrier signal generated in an interrogation zone. Modulated harmonics of the transmitter carrier signal are detected when a marker is present in the interrogation zone. The modulation detected can be at the same frequency as the modulation of the transmitter signal or a harmonic of the modulation of the transmitter signal. Detection of the modulation allows higher signal to noise ratios and therefore reduces false detections.

REFERENCES:
patent: 3686564 (1972-08-01), Mallick, Jr. et al.
patent: 3990065 (1976-11-01), Purinton et al.
patent: 4302846 (1981-11-01), Stephen et al.
patent: 4710752 (1987-12-01), Cordery
patent: 4779076 (1988-10-01), Weaver
patent: 4791412 (1988-12-01), Brooks
patent: 5005001 (1991-04-01), Cordery

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