Electronic articles surveillance system synchronization using global positioning satellite signal
First Claim
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1. A method for synchronizing the operation of a plurality of electronic article surveillance (“
- EAS”
) units, the method comprising;
receiving a global positioning satellite reference signal;
generating a master synchronization signal using the global positioning satellite reference signal; and
transmitting the master synchronization signal to a plurality of EAS units.
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Abstract
A method and system for synchronizing the operation of a plurality of electronic article surveillance (“EAS”) units that includes receiving a global positioning satellite reference signal, generating a synchronization master signal using the global positioning satellite reference signal and transmitting the master synchronization signal to the plurality of EAS units. The method and system can further include a secondary synchronization master, which is configurable to relay the master synchronization signal.
24 Citations
21 Claims
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1. A method for synchronizing the operation of a plurality of electronic article surveillance (“
- EAS”
) units, the method comprising;receiving a global positioning satellite reference signal; generating a master synchronization signal using the global positioning satellite reference signal; and transmitting the master synchronization signal to a plurality of EAS units. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- EAS”
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8. A system for synchronizing the operation of a plurality of EAS units, the system comprising:
a synchronization master, the synchronization master including; a global positioning satellite receiver to receive a global positioning satellite reference signal; a master phase-locked loop to generate a master synchronization signal; and a master radio transmitter to transmit the master synchronization signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. An EAS system, the EAS system comprising:
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synchronization receiver module, the synchronization receiver receiving a synchronization signal corresponding to a global positioning satellite reference signal and generating a CPU clock signal based on the received synchronization signal; and an EAS unit in communication with the synchronization receiver module, the EAS unit arranged to interrogate an EAS marker by transmitting interrogation signals, the EAS unit receiving the CPU clock signal and synchronizing the interrogation signals to the CPU clock. - View Dependent Claims (18, 19, 20, 21)
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Specification