摘要:
A workstation (106) for a security system (10) includes a first video display (602a) displaying status information of video equipment (22) used at the premises to perform the surveillance. A second video display (602b) displays a plurality of thumbnail images of an intrusion scene. A third video display (602c) displays a snapshot image from which one of said the thumbnail images is derived. The snapshot is displayed upon the thumbnail image derived from the snapshot being selected by a workstation operator. A fourth video display (602d) displays data relating to the premises, identifying the location on the premises where the intrusion occurred, who should be contacted about the intrusion, etc.
摘要:
A housing assembly (20) for protecting electronic components. An enclosure (21) is open at one end (22). Electronic components are housed in the enclosure. A bung member (25) is insertable into the open end of the enclosure to seal the enclosure. The member defines a channel (27) and a spreader element (28) is insertable into the channel. The spreader element is formed to cause the bung member to expand upon insertion of the spreader to seal the enclosure against moisture and contaminants.
摘要:
A system for debouncing a switch circuit includes a sample circuit for providing an initial determination of the switch status, and a debounce circuit connected to operate on the output of the sample or sensing circuit to verify the actual switch status by providing a confirmation signal. The system of the invention accumulates a count related either to the rate at which the sample circuit operates, or the actual changes in state indicated by latches coupled to the sample circuit. If the count accumulates to a predetermined number before being cleared by a confirmation signal verifying the switch status, then the irregular operation is signalled. This identifies a continuous, rapid alternation between different switch states without a confirmation of an actual state change, which would otherwise be undetected by system operation.
摘要:
A communications system includes a transmitter for sending successive composite signals, each of which has successive segments which represent different data. A composite signal can be a pulse group with the segments denoted by individual pulses. A plurality of receivers are connected to receive the successive composite signals and recognize the data in each signal. Part of the transmitted composite signal is encoded by modifying at least one segment of a given composite signal in a predetermined manner. When an addressed receiver detects the encoded data or key in the composite signal, the receiver assigns a different significance to data in the remainder of that composite signal, and/or in at least one other composite signal. If the key is present in the next successive transmission, yet another significance is assigned to the data.
摘要:
A sensor alignment tool (10) for use in the installation of sensors (S), particularly a pair of sensors such as are used in a security system or the like. Once a proper location for the sensors is identified, a mounting base (12a–12d) for one of the sensors is located adjacent a surface where the sensors are to be installed. The tool is then employed with two sets (16, 20) of adjustment rods (18, 22) to properly locate and align the sensor mounting base for the other sensor. Tolerant mounting washers are used to mount both bases to the surfaces to which they are to be attached. Once the mounting bases are properly aligned, the tool is removed and the sensors installed in their respective mounting bases.
摘要:
A security alarm system includes a transponder having a housing enclosing both a sensor and associated circuit means in a unitary package. The housing base includes barrel-shaped connectors, and a pc board carrying the communications components is carried by the housing cover. Flag-like connectors mate with the barrel-shaped connectors when the cover is attached to the base, and the connectors give both good mechanical indexing and retention, and effective electrical contact. Removal of the cover from the base breaks the electrical contact and thus breaks continuity back to the system controller, indicating someone has tampered with the system.
摘要:
An alarm system includes a controller and a plurality of transponders having different addresses. Certain of the transponders include switch means for monitoring conditions, and latch circuits to retain memory of the switch conditions. The controller includes means for positive recognition of a latched alarm or trouble condition in any transponder, before the clear-alarm signal or clear-trouble signal is sent from the controller to restore the alarm circuits to their original states. This insures that an alarm or trouble condition at a transponder is not "missed" by inadvertent clearing before a positive recognition is registered in the controller.
摘要:
An independent transmitter/receiver, or a transponder in a communication system, receives signals distorted by outside, unwanted conditions such as noise, line capacitance, and so forth. The status of a switch is checked at periodic times, by pulsing, rather than by continuous current flow, to conserve power. The invention includes a debounce circuit for monitoring the switch status; the debounce circuit is adjusted by a debounce select signal received from outside the transmitter/receiver. In addition a sensing circuit is coupled between the switch being monitored and the debounce circuit. The sensing circuit also has its sensing operation adjusted as a function of the debounce select signal. This allows for accurate monitoring of the switch condition, notwithstanding noise, line capacitance and other factors.
摘要:
A communication system useful for fire detection which transfers data/commands bidirectionally between a controller and connected transponders on a real time, interactive basis. This system makes possible accurate data recovery, whether a transponder has its output shorted, or although multiple transponders are replying and makes possible the remote determination and constant monitoring of transducer sensitivity, at the controller. The sensitivity can be adjusted remotely at the controller, and different transducers can have different thresholds simultaneously, which can be changed collectively or individually to different settings manually or automatically at the controller. The system transmits reference data for supervision of system accuracy. Compensation for long-term changes is provided for both transponders and reducers in this system.
摘要:
A site control unit (12) located at a premises (F) processing video images obtained from a plurality of cameras (22) located about the premises and relaying the presence of a real intrusion to a central station (CS). The site control unit has an image acquisition module (24) receiving video images from the cameras. An image processor (30) processes the images to eliminate possible causes of false alarms of an intrusion and reliably detecting actual intrusions. The processor includes video masking (32) to filter known motion present within a scene, detection (34) detecting movement in unmasked portions of the scene, and recognition (36) classifying the cause of the movement. An indication of an intrusion is given only if the cause is one of a class of predetermined causes representing an intruder on the premises, or an unknown cause. A video recorder (38) records images of the actual intrusion and supplies recorded images to a security system operator (O) who informs authorities of in intrusion. The video recorder produces snapshots (X1-Xn) of a scene viewed by the camera detecting the intrusion detected, authenticates (42) the snapshots, and transmits (46) the snapshots for viewing by the operator.