Pulsed electronic article surveillance device employing expert s

Details Pulsed electronic article surveillance device employing expert s Pulsed electronic article surveillance device employing expert s

1994-09-28

1996-02-27

Swann, III, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

340572, G08B 13187

Patent

active

054952298

ABSTRACT:
An electronic article surveillance system has a receiver with a plurality of receiving coils. Each coil in the system is treated as a separate detection unit with its own noise environment which is distinct from the noise environments of the other coils in the system. This allows the system to optimize its performance by maximizing the sensitivity of each coil according to its own local noise environment. In EAS systems in accordance with the invention, the priority of the detection routines is to keep an accurate and up-to-date picture of the noise environment for each coil in "noise phases" and to look for tags during "transmit phases". Upon tag detection, a controller establishes a validation sequence comprising a number of cycles and can change the number of cycles adaptively to the noise environment.

REFERENCES:
patent: 4658241 (1987-04-01), Torre
patent: 4663612 (1987-05-01), Mejia et al.
patent: 5023598 (1991-06-01), Zemlock et al.
patent: 5349332 (1994-09-01), Ferguson et al.

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