Line synchronized delays for multiple pulsed EAS systems

Details Line synchronized delays for multiple pulsed EAS systems Line synchronized delays for multiple pulsed EAS systems

1997-11-28

1999-11-30

Lefkowitz, Edward

Communications: electrical

Condition responsive indicating system

With particular system function

340572, 34031004, 340552, 455127, G08B 2600

Patent

active

059950021

ABSTRACT:
A method for initializing an electronic article surveillance (EAS) system which transmits pulses into an interrogation zone and receives signals from the interrogation zone in a sequence of multiple successive transmit and receive windows during each line period of an AC mains supply energizing the EAS system, associated with a corresponding apparatus, comprises the steps of: (a.) determining whether a delay value is stored in a nonvolatile memory; (b.)if the delay value is stored in the nonvolatile memory, loading the stored delay value into a delay control register, terminating the initializing and omitting all remaining steps; (c.) if the delay value is not stored in the nonvolatile memory, loading a first delay value into the delay control register; (d.) determining whether noise in a certain receive window is less than a threshold level; (e.) if the noise is less than the threshold level, terminating the initializing and omitting all remaining steps; (f.) if the noise level is not less than the threshold level, loading a second delay value into the delay control register; (g.) determining if the EAS system is operating properly; (h.) if the EAS system is operating properly, terminating the initializing and omitting all remaining steps; (i.) if the EAS system is not operating properly, loading the first delay value into the delay control register; and, (j.) terminating the initializing.

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