Digital detection filters for electronic article surveillance

Details Digital detection filters for electronic article surveillance Digital detection filters for electronic article surveillance

G - Physics

08

B

G08B 13/14 (2006.01) G08B 13/24 (2006.01) H04B 1/10 (2006.01) H04L 5/12 (2006.01) H04L 27/06 (2006.01) H04Q 5/22 (2006.01)

Patent

CA 2441904

Digital implementation of electronic article surveillance (EAS) detection filtering for pulsed EAS systems is provided. Embodiments include direct implementation as a quadrature matched filter bank (Fig. 9), as an envelope detector (Fig. 10), a correlation receiver (Fig. 11), and as a discrete Fourier transform (Fig. 12). Pre-detection nonlinear filtering (Fig. 13) is also provided for impulsive noise environments.

La présente invention concerne la mise en oeuvre numérique du filtrage de détection pour la surveillance électronique d'articles (EAS) destinée à un système EAS à impulsion. Des modes de réalisation de l'invention comprennent une mise en oeuvre directe sous forme de banc (Fig. 9) de filtres en quadrature de phase, sous forme de détecteur enveloppe (Fig. 10), de récepteur de corrélation (Fig. 11) et sous forme de transformation de Fourier discrète (Fig. 12). Cette invention concerne aussi un filtrage non linéaire (Fig. 13) de pré-détection destiné à des environnements à bruit impulsif. .

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