Automatic wireless synchronization of electronic article...

Communications: electrical – Condition responsive indicating system – Specific condition

Reexamination Certificate

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C340S506000, C340S010100, C375S356000, C375S376000

Reexamination Certificate

active

10056947

ABSTRACT:
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 transmit 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.

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