Auto-phasing synchronization for pulsed electronic article...

G - Physics – 08 – B

Patent

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G08B 13/14 (2006.01) G08B 13/24 (2006.01) G08B 29/18 (2006.01)

Patent

CA 2445641

Automatic synchronization of electronic article surveillance (EAS) systems operating in proximity to each other is provided. The system and method involves determining the source of a detected signal (1-11), and automatically adjusting the phase of a pulsed EAS transmitter (13-17) by amplitude sampling a received signal to detect the leading edge of an interfering transmit pulse, and calculating a corresponding delay for synchronizing the instant transmitter to the interfering transmitter. Detection of EAS tags placed too close to the EAS transmitter interrogation zone (20) is also provided. An alarm can be implemented to indicate detected EAS tags that are placed too close to the interrogation zone.

L'invention concerne la synchronisation automatique de systèmes électroniques de surveillance d'articles (EAS) fonctionnant à proximité les uns des autres. Elle concerne notamment un système et un procédé destinés à déterminer la source d'un signal détecté (1-11) et à régler automatiquement la phase d'un émetteur EAS à impulsions (13-17) par échantillonnage en amplitude d'un signal reçu en vue de détecter le front montant d'une impulsion d'émission brouilleuse, puis à calculer un retard correspondant en vue d'une synchronisation de l'émetteur EAS avec l'émetteur brouilleur. L'invention concerne en outre la détection d'étiquettes EAS trop proches de la zone d'interrogation (20) de l'émetteur EAS. Une alarme peut être mise en oeuvre pour indiquer les étiquettes EAS détectées qui sont trop proches de la zone d'interrogation.

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