EAS system with improved processing of antenna signals

Details EAS system with improved processing of antenna signals EAS system with improved processing of antenna signals

1992-11-19

1995-02-07

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1314

Patent

active

053879007

ABSTRACT:
An EAS system in which first and second received signals are independently front-end processed to produce third and fourth signals indicative of the absolute values of the first and second processed signals. The third and fourth signals are then combined and the combined signal passed to a tag evaluation processor for time and frequency domain processing for evaluating whether a tag is present in an interrogation zone. The front-end processing is carried out in such a way that interference signal content including shield interference is extracted without extracting tag signal content in the received signals over a period of time. In this way, the first and second transmitter antennas of the system can be driven with drive signals having a phase difference of other than 0.degree. or 180.degree. and the tag evaluation processing can be carried out during the entire period of the drive signals.

REFERENCES:
patent: 4135183 (1979-01-01), Heltemes
patent: 4243980 (1981-01-01), Lichtblau
patent: 4260990 (1981-04-01), Lichtblau
patent: 4309697 (1982-01-01), Weaver
patent: 4489313 (1984-12-01), Pfister
patent: 4710752 (1987-12-01), Cordery
patent: 4751516 (1988-06-01), Lichtblau
patent: 4859991 (1989-08-01), Watkins et al.
patent: 4975681 (1990-12-01), Watkins et al.
patent: 5005001 (1991-04-01), Cordery
patent: 5049857 (1991-09-01), Plonsky et al.
patent: 5126749 (1992-06-01), Kaltner et al.

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