Electronic article surveillance system stationary tag...

Details Electronic article surveillance system stationary tag... Electronic article surveillance system stationary tag...

2005-09-20

2005-09-20

Hoff, Marc S. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S122000, C340S010100

Reexamination Certificate

active

06947860

ABSTRACT:
A ringdown canceller is provided for electronic article surveillance (EAS) tag response processing, which uses two adaptive replica signals and compares the replica signal phase to the receive signal phase to determine if there is a stationary EAS tag in the interrogation or detection zone. The adaptive replica buffers allow the system to adjust to changing ambient conditions, and adjust rapidly to an EAS tag that suddenly appears in the detection zone and becomes stationary, or to a stationary EAS tag that suddenly leaves the detection zone. The ringdown response of the transmitter circuit is constant, just like a stationary tag, and is removed from the receive signal in the same manner as a stationary tag.

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patent: 6353406 (2002-03-01), Lanzl et al.
patent: 2003/0102960 (2003-06-01), Beigel et al.

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