Pulsed electronic article surveillance device employing...

Details Pulsed electronic article surveillance device employing... Pulsed electronic article surveillance device employing...

G - Physics

08

B

G08B 13/24 (2006.01)

Patent

CA 2155156

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.

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