Intrusion alarm with independent trouble evaluation

Details Intrusion alarm with independent trouble evaluation Intrusion alarm with independent trouble evaluation

G - Physics

08

B

G08B 29/00 (2006.01) G08B 13/18 (2006.01) G08B 13/22 (2006.01)

Patent

CA 2102997

An arrangement and method for processing signals from infrared microwave and/or ultrasonic intrusion detectors is disclosed which allows the signal to be processed at different amplitude levels to recognize different signal characteristics. This capability to analyse the signal at different values allows further customizing of the system for particular applications and provides information useful in recognizing and dealing with unwanted signal changes typical of the environment which can effect the reliability of the alarm criteria and/or a trouble condition criteria. An assessment of the environment in a preferred aspect allows customizing of the alarm criteria to take into account the operating environment of the particular sensor or sensors. The system also accommodates increasing the effect on certain portions of the signal when considering the net overall effect of the signal. This results in more signal information being available to assess possible conditions which could lead or contribute to the generation of false alarms.

Configuration et méthode de traitement des signaux provenant de détecteurs d'intrusion à infrarouges, micro-ondes et/ou ultrasons, permettant de traiter les signaux à différents niveaux d'amplitude afin d'en reconnaître les diverses caractéristiques. L'analyse des signaux de niveaux différents adapte encore mieux le système à des applications particulières et fournit de l'information utile pour reconnaître et traiter les variations des signaux, non voulues et typiques de l'environnement, qui peuvent influer sur la fiabilité des critères d'alarme et/ou des critères de défaillance. L'évaluation de l'environnement selon un aspect choisi permet d'adapter les critères d'alarme pour tenir compte de l'environnement d'utilisation du capteur ou des capteurs utilisés. Le système peut aussi accroître l'incidence sur certaines parties des signaux, en tenant compte de l'effet global net de ces derniers. Ainsi, une plus grande part de l'information des signaux peut servir à évaluer des conditions pouvant mener ou contribuer au déclenchement de fausses alarmes.

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