Signal evaluation circuit for a motion detector

G - Physics – 08 – B

Patent

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G08B 13/19 (2006.01) G08B 29/18 (2006.01)

Patent

CA 2161878

The motion detector generates a sensor signal (SS) which contains a direct current portion and an alternating current portion. The signal evaluation circuit (3) contains means for filtering out the direct current portion, an analogue-to- digital converter (4) and an amplifier for the alternating current portion of the sensor signal. The analogue-to-digital converter (4) is provided for the direct digitizing of the entire sensor signal (SS) and the means for filtering out the direct current portion are formed by a digital high-pass filter (5) connected downstream of the analogue-to-digital converter.

Le capteur de mouvements génère un signal de détecteur (SS), lequel contient une composante courant continu et une composante courant alternatif. Le circuit d'analyse des signaux (3) contient des éléments permettant de filtrer la composante courant continu, un convertisseur analogique/numérique (4) et un amplificateur pour la composante courant alternatif du signal de détecteur. Le convertisseur analogique/numérique (4) est prévu pour assurer la numérisation directe de l'ensemble du signal de détecteur, et les éléments filtrant la composante courant continu sont constitués par un filtre passe-haut (5) numérique placé en aval du convertisseur analogique/numérique.

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