Electronic article surveillance system with comb filtering...

G - Physics – 08 – B

Patent

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G08B 13/24 (2006.01)

Patent

CA 2243079

A signal (120) received (124) in an electronic article surveillance system (100) is subjected to a nonlinear comb filtering function to remove interference. The nonlinear comb filtering is provided (130) by performing a polyphase decomposition of an input digital signal (128), nonlinear filtering of the resulting subsequences, and then synthesizing the nonlinear-filtered subsequences (130). A median filter may be used as the subsequence filtering function. A linear comb filtering function may be provided (130) downstream from the nonlinear comb filter to provide additional attenuation of interference.

Un signal (120) reçu (124) dans un système (100) de surveillance électronique d'articles est soumis à une fonction de filtrage non linéaire par filtre en peigne afin d'éliminer les interférences. Le filtrage non linéaire par filtre en peigne est obtenu (130) par décomposition polyphasée du signal numérique (128) d'entrée, filtrage non linéaire des sous-séquences résultantes et synthèse des sous-séquences linéaires (130) non filtrées. Un filtre médian peut assurer la fonction de filtrage de la sous-séquence, laquelle peut avoir lieu (130) en aval du filtre en peigne non linéaire pour fournir une atténuation additionnelle des interférences.

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