Eas system with frequency hopping

Details Eas system with frequency hopping Eas system with frequency hopping

G - Physics

08

B

G08B 13/22 (2006.01) G08B 13/24 (2006.01)

Patent

CA 2097142

An EAS system in which a transmitter transmits an RF transmitter signal into an interrogation zone and a receiver receives RF signals from the interrogation zone. The received RF signals include any RF tag signals generated by tags situated in the zone and adapted to respond to the RF transmitter signal. In order to reduce interference effects, the RF carrier frequency of the transmitter signal is adapted to take on a plurality of different frequency values during different ones of a plurality of finite dwell time periods of the RF transmitter signal.

L'invention est un système de surveillance électronique d'articles dans lequel un émetteur transmet un signal RF à une zone d'interrogation et un récepteur capte les signaux RF retransmis par cette zone d'interrogation. Ces signaux peuvent comprendre des signaux RF produits par des étiquettes placées dans la zone d'interrogation qui sont adaptées pour répondre au signal de l'émetteur RF. Pour réduire le brouillage, la fréquence de la porteuse RF du signal émis est adaptée de façon à prendre plusieurs valeurs différentes durant plusieurs intervalles de tenue finis du signal RF émis.

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