Let you know Wuxi Monitoring System composition
Wuxi Dehang Technology Co., Ltd The monitoring system is also called Closed Circuit Television (CCTV). A typical monitoring system is mainly composed of five parts: front-end audio and video acquisition equipment, audio and video transmission equipment, back-end storage, control and display equipment. The back-end equipment can be further divided into central control equipment and sub control equipment. The front and rear end devices have a variety of composition modes, and the connection between them (also called transmission system) can be realized through coaxial cable, twisted pair, optical fiber, microwave, wireless and other ways.
Wuxi Security Monitoring _Wuxi Monitoring_ Wuxi remote monitoring -Wuxi Dehang Technology Co., Ltd
Wuxi monitoring component
1、 PTZ
In the previous introduction, we often mentioned PTZ, Wuxi Security monitoring However, some people have no perceptual knowledge of it. In fact, PTZ is an installation platform composed of two AC motors, which can move horizontally and vertically. The PTZ we are talking about is different from the PTZ in photographic equipment. Generally speaking, the PTZ of photographic equipment is just a tripod and can only be adjusted by hand; The pan tilt mentioned by the monitoring system can control its rotation direction at the far end through the control system.
There are many types of PTZ: indoor type and outdoor type according to the use environment. The main difference is that the outdoor type has good sealing performance, waterproof, dustproof, and heavy load. According to the installation mode, it can be divided into side installation and hoisting, that is, whether the PTZ is installed on the ceiling or on the wall. According to the shape, it can be divided into ordinary type and spherical type. The spherical head is placed in a hemispherical and spherical protective cover. In addition to preventing dust from interfering with the image, it is also concealed, beautiful and fast. When selecting PTZ, the installation environment, installation mode, working voltage, load size, performance price ratio and appearance shall be considered.
2、 Support
Wuxi remote monitoring If video camera Only a fixed monitoring position does not need to be rotated, so only the camera bracket can meet the requirements. Common camera brackets are simple to install, inexpensive, and of various types. Common supports are short, long, straight and curved, and different models are selected according to different requirements.
The outdoor support mainly considers whether the load capacity meets the requirements, and then the installation position. Because in practice, we found that many outdoor cameras have special installation positions, some are installed on poles, some are installed on tower cranes, and some are installed on iron frames... For various reasons, the existing support may be difficult to meet the requirements, and need to be processed or improved, I won't say more here.
3、 Protective cover
The protective cover is also one of the most commonly used equipment in the monitoring system, which is mainly divided into indoor and outdoor. The main difference between indoor protective covers is their size, appearance and surface treatment. Its function is mainly to prevent dust and damage. The sealing performance of outdoor protective cover must be good to ensure that rainwater cannot enter the protective cover to erode the camera. Some outdoor protective covers are also equipped with exhaust fans, heating plates and wipers to better protect equipment. When the weather is too hot, the exhaust fan works automatically; The heating plate works automatically when it is too cold; When there is rain on the protective cover glass, the wiper can be started through the control system. When selecting the protective cover, first look at the overall structure. The fewer mounting holes are, the better for waterproofing. Then look at whether the internal lines are easy to connect. Finally, consider the appearance, weight, mounting base, etc.
4、 Monitor
The monitor is the standard output of the monitoring system. With the monitor, we can view the images sent from the front end. The monitor is divided into color and black and white, and the size is 9, 10, 12, 14, 15, 17, 21 inches, etc. The commonly used size is 14 inches. The monitor also has resolution, which is represented by the number of lines just like the camera. In actual use, the number of lines of the monitor is generally required to match the camera. In addition, some monitors also have audio input, S-video input, RGB component input, etc. In addition to the audio input monitoring system, most of the other functions are used for image processing, which will not be introduced here.
5、 Video amplifier
When the video transmission distance is relatively long, it is better to use a video cable with a larger wire diameter. At the same time, a video amplifier can be added in the line to enhance the signal strength for long-distance transmission. The video amplifier can enhance the brightness, chroma and synchronization signal of the video, but the interference signal in the line will also be amplified. In addition, too many video amplifiers cannot be connected in series in the circuit, or saturation will occur, leading to image distortion.
6、 Video distributor
One video signal corresponds to one monitor or video recorder. If you want to send the image of one camera to multiple managers, you'd better choose a video distributor. Because the parallel video signal attenuation is large, the image will be seriously distorted and the line will be unstable due to impedance mismatch and other reasons after being sent to multiple output devices. In addition to impedance matching, the video splitter also has video gain, so that video signals can be sent to multiple output devices at the same time without being affected.
7、 Video switcher
Multiple video signals should be sent to the same place for monitoring. One video can correspond to one monitor, but the monitor occupies a large area and is expensive. If it is not required to monitor all the time, a switcher can be added in the monitoring room to connect the camera output signal to the input end of the switcher. The output end of the switcher is connected to the monitor. The input end of the switcher is divided into 2, 4 6. 8, 12 and 16 channels, the output terminal is divided into single channel and dual channel, and the audio can also be switched synchronously (depending on the model). The switcher has two working modes: manual switching and automatic switching. The manual mode is to turn the switch to whichever way you want; The automatic mode is to make the preset videos switch in a delayed manner in sequence. The switching time can be adjusted by a knob, generally between 1 second and 35 seconds. The switch is cheap (generally only three or five hundred yuan), easy to connect and operate, but only one image in the input can be viewed in a period of time. To view multiple camera images on one monitor at the same time, you need to use a picture splitter.
8、 Picture splitter
The picture splitter has four divisions, nine divisions and sixteen divisions. It can display the images of 4, 9 and 16 cameras on one monitor at the same time, or send them to the video recorder for recording. Four segment is one of the most commonly used devices, and its performance price ratio is also good. The image quality and continuity can meet most requirements. Nine segment and sixteen segment are expensive, and the resolution and continuity of each image will decline after segmentation, resulting in poor video recording effect. In addition, there are six segment, eight segment and double four segment equipment, but the image ratio, clarity and continuity are not ideal, and the market utilization rate is smaller. In addition to displaying images at the same time, most splitters can also display a single picture, which can overlap time and characters, set automatic switching, and connect alarm devices.
IX Digital Video Recorder
The most commonly used recording equipment in the monitoring system are civil video recorders and long delay video recorders. Because of their simple operation and easy learning, video tapes are also easy to save and purchase. Different from home video recorders, time delay video recorders can work for a long time, record images for 24 hours (using ordinary VHS video tapes) or even hundreds of hours, connect alarm devices, automatically start recording after receiving alarm signals, stack time and date, prepare automatic video recording programs for video recorders, and select recording speed, When the video tape ends, it will automatically stop or rewind... Although the delay video recorder has outstanding performance, it is expensive, and the current resolution is not very high. When the delay video is recorded, part of the image will also be lost, and the playback image will jump one by one.
10、 Monitoring management platform
It combines modern audio and video compression technology, network communication technology, computer control technology, streaming media transmission technology, and adopts the modular software design concept to realize the needs of different customers in the form of component modules; With centralized network management and network transmission as the core, it completes the whole process of information collection, transmission, control, management and storage, and can be built on various private networks/LANs/MAN/WAN. Hypervision Technology cooperates with mainstream hardware manufacturers in the market and is compatible with a variety of brand hardware products. It truly realizes the monitoring networking and centralized management. Authorized users can monitor the monitoring site in real time on any computer in the network, providing a powerful and flexible integrated solution for network centralized monitoring.
11、 Disk array
In large monitoring systems, due to the large number of monitoring videos and large storage, disk arrays are needed. The disk array is composed of many inexpensive disks, which are combined into a disk group with huge capacity. It uses the addition effect of individual disks to provide data to improve the performance of the entire disk system. Using this technology, the data is cut into many sections and stored on each hard disk.
The disk array can also use the concept of Parity Check to read data when any hard disk in the array fails. When data is reconstructed, the data will be re placed into a new hard disk after calculation.
