Automatic wireless synchronization of electronic article...

H - Electricity – 03 – L

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H03L 7/07 (2006.01) G08B 13/24 (2006.01) H03L 7/099 (2006.01)

Patent

CA 2437793

A distributed wireless phase locked loop system for synchronizing the transmit carrier's modulating waveform, such as the transmitter pulse timing in a pulsed EAS system and the transit sweeping function for swept RF synchronization, is provided. To remove the effect of phase noise on the power line signal, a phase locked loop is used to filter this signal. The filtered output is used as a reference to a second phase locked loop tied to a numerically controlled oscillator and the received signal to provide a distributed phase looked loop algorithm that is wireless, and automatically synchronizes adjacent EAS systems.

L'invention concerne un système de boucle à phase asservie sans fil réparti destiné à synchroniser la forme d'onde modulant la porteuse d'émission, p. ex. synchronisation par impulsions d'émetteur dans un système de service régional par impulsions et fonction de balayage d'émission pour synchronisation HF à balayage. Pour éliminer l'effet de bruit de phase sur le signal de ligne électrique, une boucle à phase asservie est utilisée pour filtrer le signal. Le signal de sortie filtré est utilisé comme référence d'une deuxième boucle à phase asservie reliée à un oscillateur commandé numériquement et au signal reçu pour produire un algorithme de boucle à phase asservie réparti, sans fil, qui permet de synchroniser automatiquement des systèmes de service régional adjacents.

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