Electronic article surveillance system utilizing synchronous int

Details Electronic article surveillance system utilizing synchronous int Electronic article surveillance system utilizing synchronous int

1987-08-31

1989-03-14

Swann III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1324

Patent

active

048128228

ABSTRACT:
An electronic article surveillance system employs a resonant tag attached to an article being protected. An interrogation transmitter whose transmission frequency is periodically swept through the resonant frequency of the tag is positioned near an exit of the protected area. The resonant tag is periodically energized by the transmitter as the transmitter frequency passes through the resonant frequency of the tag to cause the tag to emit a periodic tag signal at the sweep rate of the transmitter. The tag signal is received by a receiver that generates an alarm upon the detection of a tag signal. The receiver employs synchronous integration in the form of a dual channel synchronous video integrator to independently process positive and negative pulses of the tag signal in order to differentiate the tag signal from extraneous signals and noise.

REFERENCES:
patent: 3863244 (1975-01-01), Lichtblau
patent: 3868669 (1975-02-01), Minasy
patent: 4531117 (1985-07-01), Nourse et al.

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