CCTV monitoring system a brief overview of the three major components
Typical CCTV Monitoring System Mainly by the front-end devices, channel and terminal equipment, the three major components. Before the back-end equipment, a variety of ways constitute between them through cable, fiber or microwave and other means to achieve.
1, the front part of the
Front-end device is a closed-circuit television Monitor The front part of the system, also called camera part of the whole system of "eyes." It is being arranged Monitoring Places a particular position, to cover the entire field of view can be monitored in all parts. Monitoring sites are sometimes larger, to save Video camera The number used to simplify transmission system and control and display system, install the camera on the electrical variable focal length (zoom) Shot , So the camera can observe farther, more clearly; sometimes also the camera installed in the electric Head On the control console, can bring cameras horizontal head and vertical rotation, so that the angle of the camera can cover an area larger. In short, the camera just like the eyes of the entire system as it monitors the content into the image signal transmitted to the control center Monitors On. As the camera part is the most front-end system and is monitoring the situation places it into the image signal from the transmission to the control center of the monitor, so in terms of the whole system, camera system, part of the original signal. Therefore, the camera and it produces some of the good and bad quality of the image signal will affect the quality of the whole system.
Addition to the above discussion, the parts for the camera, in some cases, especially in the case of outdoor applications, to dust, rain, high and low temperature resistance, corrosion resistance, etc., on the camera and The lens should also install a special shield, and even head must have the appropriate protective measures.
Second, transmission part of the Part of a system of image transmission pathway. In general, the transmission part of the single-image signal that is transmitted. However, some systems, in addition to images, some have also transmit voice signals, while the control center as required by the console on the camera, lens, head, shield and other control, which also included in the transmission system a control signal transmission, we are here talking about the transmission part, usually refers to the transmission of signals to the formation of all the transmission systems combined.
C, control section Control part of the whole system of "heart" and "brain" is the function of the entire system command center. Control, which consists of the total console (some systems also have Vice console) component. The main function of the total console are: video signal amplification and distribution of the image signal a more positive and compensation, the image signal switching, image signals (or include sound signals) records, cameras and accessories (such as lens, head, protective cover, etc.) Control (remote control) and so on. The main aspect of the total console can be on camera, lens, head, protection hood, etc. remote control, to complete the sites being monitored comprehensive and detailed surveillance or tracking surveillance. With the total console DVR May at any time to the occurrence of the images were recorded to monitor sites for later reference or as an important basis.
General Console cameras and ancillary equipment (such as lens, head, protective cover, etc.) control methods commonly used bus, the control signal sent to the cameras in the vicinity of the decoder, the decoder will always console Solution coding control signal sent out, a movement command control signal, go control the camera and auxiliary equipment of various actions (such as the zoom lens, head rotation, etc.).
Decoder is divided into built-in decoder board, indoor and outdoor decoder decoder.
4, display Show some generally composed of several or more monitors. Its function is to transmit over the image 11 displayed. In the closed-circuit television monitoring system, especially in the composition of multi-camera CCTV system in general not correspond to one monitor a video camera to display, but the images of several cameras with a monitor signal turns switch display. This one can save equipment, reduced space occupancy; second is not necessary to correspond to display. Place to monitor the situation because they were not simultaneously unexpected, so usually just repeat a certain time (eg a few seconds, ten seconds or tens of seconds) to show the can. When a place is to monitor the occurrence of the time, this way you can switch the signal to switch to one monitor has been shown, and its remote control through the console track record.
General size of the monitor 14 inch, 17 inch, 21 inch.
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