G - Physics – 08 – B
Patent
G - Physics
08
B
G08B 13/16 (2006.01) G08B 29/24 (2006.01) G08B 29/18 (2006.01)
Patent
CA 2407117
The invention concerns an acoustic pressure sensor (10) delivering an analog signal to first amplifying means (12) and to second amplifying means (14), a first comparator (34) whereof the input + is connected to the output of the second amplifying means and whereof the output delivers a warning signal to alarm means (26, 28) when there is a break-in or an attempt at breaking in, and self-adjusting means comprising a microprocessor (26) programmed to deliver a digital signal at the input - of said first comparator whereof the pulses have a variable width which increases in accordance with the duration and the importance of said atmospheric disturbance so as to automatically increase the alarm device triggering threshold and hence reduce its sensitivity when the acoustic sensor detects an atmospheric disturbance such as wind.
Dispositif d'alarme comprenant un capteur de pression acoustique (10) fournissant un signal analogique d'une part à un premier moyen amplificateur (12) et d'autre part à un second moyen amplificateur (14), un premier comparateur (34) dont l'entrée + est connectée à la sortie du second moyen amplificateur et dont la sortie fournit un signal d'alarme à des moyens d'alarme (26, 28) en cas d'effraction ou de tentative d'effraction, et des moyens d'autorégulation comportant un microprocesseur (26) programmé pour fournir un signal numérique à l'entrée - dudit premier comparateur dont les impulsions ont une largeur variable qui croît en fonction de la durée et de l'importance de ladite perturbation atmosphérique de façon à augmenter automatiquement le seuil de déclenchement du dispositif d'alarme et donc diminuer sa sensibilité lorsque le capteur acoustique détecte une perturbation atmosphérique telle que du vent.
F. And F. International S.a.r.l.
Smart & Biggar
LandOfFree
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