Combined infrasonic and infrared intrusion detection system
First Claim
1. An intrusion and alarm sending arrangement comprising:
- at least one motion sensing device, a first motion signal threshold device having an input connected to said motion sensing device for generating a motion alarm indication in response to a motion signal exceeding a motion threshold determined by said first motion threshold device;
at least one infrasonic sensing device, an infrasonic threshold device having an input connected to said infrasonic sensing device for generating an infrasonic alarm indication in response to an infrasonic signal exceeding an infrasonic threshold determined by said infrasonic threshold device;
a decision device having a motion alarm input and an infrasonic alarm input for respectively receiving said motion alarm indication and said infrasonic alarm indication, and an output for generating a valid alarm indication upon determining simultaneity of said motion alarm indication and said infrasonic alarm indication and a motion signal timing device having an input connected to said first motion signal threshold device, said motion signal timing device being operative for generating a time-integrated motion signal, and a second motion signal threshold device connected to said motion signal timing device operative for generating said motion alarm indication in response to said time-integrated motion signal'"'"'s exceeding a second motion signal threshold.
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Accused Products
Abstract
An intrusion and alarm sending arrangement having at least one motion sensing device and a first motion signal threshold device has an input connected to said motion sensing device for generating a motion alarm indication in response to a motion signal exceeding a motion threshold determined by said first motion threshold device. At least one infrasonic sensing device is connected to a first infrasonic threshold device having an input connected to said infrasonic sensing device for generating an infrasonic alarm indication in response to an infrasonic signal exceeding an infrasonic threshold determined by said first infrasonic threshold device. A decision device has a motion alarm input and an infrasonic alarm input for respectively receiving said motion alarm indication and said infrasonic alarm indication, and an output, for generating a valid alarm indication upon determining simultaneity of said motion alarm indication and said infrasonic alarm indication. The arrangement may additionally include devices for receiving and sending from other alarm inputs such as smoke detectors, low temperature detectors, "panic" signals, and the like.
17 Citations
13 Claims
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1. An intrusion and alarm sending arrangement comprising:
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at least one motion sensing device, a first motion signal threshold device having an input connected to said motion sensing device for generating a motion alarm indication in response to a motion signal exceeding a motion threshold determined by said first motion threshold device; at least one infrasonic sensing device, an infrasonic threshold device having an input connected to said infrasonic sensing device for generating an infrasonic alarm indication in response to an infrasonic signal exceeding an infrasonic threshold determined by said infrasonic threshold device; a decision device having a motion alarm input and an infrasonic alarm input for respectively receiving said motion alarm indication and said infrasonic alarm indication, and an output for generating a valid alarm indication upon determining simultaneity of said motion alarm indication and said infrasonic alarm indication and a motion signal timing device having an input connected to said first motion signal threshold device, said motion signal timing device being operative for generating a time-integrated motion signal, and a second motion signal threshold device connected to said motion signal timing device operative for generating said motion alarm indication in response to said time-integrated motion signal'"'"'s exceeding a second motion signal threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An intrusion and alarm sending arrangement comprising:
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at least one motion sensing device, a motion signal threshold device having an input connected to said motion sensing device for generating a motion alarm indication in response to a motion signal exceeding a motion threshold determined by said motion signal threshold device; at least one infrasonic sensing device, a first infrasonic signal threshold device having an input connected to said infrasonic sensing device for generating an infrasonic alarm indication in response to an infrasonic signal exceeding an infrasonic threshold determined by said first infrasonic threshold device; a decision device having a motion alarm input and an infrasonic alarm input for respectively receiving said motion alarm indication and said infrasonic alarm indication, and an output, for generating a valid alarm indication upon determining simultaneity of said motion alarm indication and said infrasonic alarm indication; and an infrasonic signal timing device having an input connected to said first infrasonic signal threshold device, said infrasonic signal timing device being operative for generating a time-integrated infrasonic signal, and a second infrasonic signal threshold device connected to said infrasonic signal timing device being operative for generating said infrasonic alarm indication in response to said time-integrated infrasonic signal'"'"'s exceeding a second infrasonic signal threshold. - View Dependent Claims (12, 13)
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Specification