Showing papers on "Intrusion detection system published in 1974"

Video-type universal motion and intrusion detection system

Abstract: A motion and intrusion detection system utilizing video techniques samples fixed points during a video scan of the field of view of a camera and stores information concerning the fixed scanned points. During subsequent scans, information concerning the respective scanned points is compared with previous scans and threshold conditions are set up in order to detect an alarm condition. Further, apparatus is provided to change the field of view of the video system and in order to automatically focus and zoom in to magnify a particular portion of the field of view. Still further, means is provided to display a "map" of the alarmed areas on the screen of the television monitor.

Intrusion detector self-test system

Abstract: An intrusion detection system which automatically makes periodic tests of the operability of the system and provides an alarm in the event of a malfunction during the supervisory self-check regimen which alarm is distinguishable from the normal intrusion alarm.

Line scan area signature detection system

Abstract: An area signature detection system arranged to receive an output from a sensor operative in the electromagnetic spectrum, where the output from the sensor is an amplitude varying electrical signal representing the field-of-view beheld by the sensor, and to utilize this high frequency information in such a manner that low frequency scene content, necessary for area correlation processing, can be extracted and effectively utilized. Our invention involves certain highly advantageous techniques for generating area signatures from line scan sensors, and may be applied to cartesian, circular or polar scan formats. In one particular embodiment of our invention, we describe how orthogonally disposed area signatures can be used to generate area correlation tracking signals that can be used in the derivation of appropriate missile guidance commands. Our teachings are also useful in providing line-of-sight stabilization for fire control systems, alignment and position errors for landing and hovering control systems, as well as intrusion detection systems. In the case of a system using a television camera as the sensor, this invention provides a way of obtaining an operator display and system control signals despite the fact that only a single such sensor is used.

Fire and intrusion security system

Abstract: A security system which includes closed loop fire detection circuitry, having a continuous monitor of the pyrogenic sensors, closed loop intrusion detection circuitry, a multiple tone audible alarm generator, a coded keyboard digital electronic lock circuit, and a fail-safe alternating current, direct current power supply which includes a battery, battery charging circuit, and a system testing facility. The audible alarm circuitry includes a modulated tone frequency generator and a modulating circuit operable between a plurality of states in response to different alarm conditions. The fire and intrusion circuits include filter circuits to prevent spurious operation, and feedback latching circuits for generating continuous alarm signals in response to a breach of the system. The entire circuit is fabricated with solid state electronic components including micro-electronic circuitry. Further, test circuits are provided with visual and audible signals to indicate status of intrusion sensors, pyrogenic sensors, and battery condition. Individual arming circuits for perimeter intrusion and interior intrusion are provided with visual signals for each.

Intrusion alarm system

Abstract: An intrusion detection apparatus employing a pressure differential sensor for sensing an entry into a room, building or other enclosure. A fan maintains a pressure differential between the enclosure and the external environment and causes air flow through the sensor. Opening of doors and windows or other intrusions into the enclosure causes changes in sensor air flow and the generation of an electrical signal highly sensitive to the changes. A signal processor processes the signal based upon direction, amplitude and time-period of change to distinguish between intrusion-caused and non-intrusion-caused changes.