Electronic article surveillance system with comb filtering...

Details Electronic article surveillance system with comb filtering... Electronic article surveillance system with comb filtering...

G - Physics

08

B

G08B 13/22 (2006.01) G08B 13/24 (2006.01) G08B 29/18 (2006.01)

Patent

CA 2232575

A signal received in an electronic article surveillance system (100) is comb- filtered (150, 150') to remove interference. A second comb-filtering fucntion (154, 154') is provided to detect occasions when the first comb-filtering generates ringing artifacts in response to impulsive noise. Alarm indications (133) are inhibited at times when the artifacts due to impulsive noise are detected. Bandwiths of the filtering functions are adjustable in response to operator input (182).

Selon la présente invention, un signal reçu au niveau d'un système électronique de surveillance d'articles (100) est soumis à un filtrage par filtres en peigne (150, 150') afin d'éliminer les interférences. Une deuxième fonction de filtrage par filtres en peigne (154, 154') permet de détecter les cas où le premier filtrage par filtres en peigne génère un artéfact se manifestant sous forme de sonnerie en réaction à un bruit impulsionnel. Il y a inhibition des indications d'alarme (133) dans les cas de détection d'artéfacts imputables à un bruit impulsionnel. Les largeurs de bande des fonctions de filtrage sont réglables suite à une intervention clavier de l'opérateur (182).

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