Electronic article surveillance system utilizing synchronous...

G - Physics – 08 – B

Patent

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343/17, 340/124.

G08B 13/24 (2006.01)

Patent

CA 1295028

ELECTRONIC ARTICLE SURVEILLANCE SYSTEM UTILIZING SYNCHRONOUS INTEGRATION Abstract of the Disclosure An electronic article surveillance system employs a resonant tag attached to an article being protected. An interrogation transmitter whose trans- mission 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 trans- mitter 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 ex- traneous signals and noise.

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