Analysis on the application of video surveillance transmission of common cable
The emergence of a common cable TV monitoring transmission equipment not only provides a high-quality and low-cost solution for multi-channel monitoring signal two-way broadband synchronous transmission, but also completely changes the traditional monitoring spider network star structure wiring.
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The emergence of a common cable TV monitoring transmission equipment not only provides a high-quality and low-cost solution for multi-channel monitoring signal two-way broadband synchronous transmission, but also completely changes the traditional monitoring spider network star structure wiring.
1 Overview
With the deepening of reform and opening up and the rapid development of the national economy, the number of urban migrants has increased significantly, which has brought many unrest factors to the society. The security situation has become increasingly severe. The incidence of criminal cases, especially burglary and robbery, has increased year by year. The relevant state departments have proposed comprehensive management of social security, and closed-circuit television monitoring has become an indispensable system in security prevention.
The use of CCTV surveillance is becoming more widespread, and many new technologies are constantly being applied to the surveillance field. In terms of transmission, the use of optical fibers and optical transceivers not only enables remote monitoring, but also improves the quality of transmission of surveillance images and monitoring signals. In the case of surveillance transmissions from tens of kilometers to hundreds of kilometers, optical transmission is the best choice for transmission. However, in monitoring applications below 1-5 km, traditional coaxial video cable transmission methods have to be used in most cases due to system cost, because optical fibers and optical transceivers are not economical for close-range monitoring systems. However, since the coaxial cable attenuates the video signal greatly, if the transmission distance exceeds two or three hundred meters, the image quality will be significantly distorted. Even with the addition of the video amplifier, the transmission distance is hard to increase greatly, and the image quality is difficult. Intention, the project cost has also increased significantly. Therefore, image and signal transmission of around 1-5 kilometers has become a major bottleneck in the field of surveillance applications. Is there no quality and cheap solution? A new technology has emerged that will solve this problem that plagues people. This is the transmission technology of Aokang's “first-line†monitoring. The emergence and application of this new transmission technology is a major change in the wiring mode of TV monitoring, enabling the monitoring transmission mode to achieve a mileage leap.
2. Several monitoring image transmission methods
Before the emergence of the common cable "first-line" TV surveillance transmission technology, the image signals were mainly monitored using conventional video cables and optical fiber transmission televisions.
Video coaxial cable is the earliest to use and the longest transmission method. When the video signal is transmitted in the coaxial cable, not only the overall amplitude of the signal is attenuated, but also the attenuation of each frequency component and the video amplitude is very large, especially the color saturation portion is most attenuated. Therefore, the traditional video cable is only suitable for transmitting image signals at close range, generally around 200-300 meters. Although the transmission distance can be extended by adding a video amplifier, there are also problems in engineering opening/debugging/maintenance, as well as image quality and distance limitation. In addition, if other control signals are transmitted while the image signal is being transmitted, additional wiring is required, resulting in an increase in engineering cost and construction difficulty. At the same time, the transmission immunity of traditional video cables is extremely poor, such as in places with strong interference sources in power plants and large factory buildings. This is also the Achilles heel of video coaxial cables, which is greatly limited due to the problem of transmission distance and interference. Its scope of use and development.
Optical fiber and optical transceivers are the best choice for distance monitoring systems above the kilometer level, while coaxial cable transmission distances are limited. Thus, for distances ranging from 300m to 5km, people are always faced with a dilemma: the use of coaxial cable and video amplifiers does not work. Well, the cable usage is not low, and the use of fiber is not economical. Nowadays, the emergence of broadband "common line" TV monitoring transmission equipment solves this problem, and it will become an inevitable choice for monitoring transmission from several kilometers to several tens of kilometers.
3. Transmission advantage of common cable line monitoring
The reason why Pufei's cable "first-line communication" TV monitoring has become an inevitable choice is because it has many advantages such as strong anti-interference ability, easy wiring and low price.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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