文档介绍：总结闭路监控系统受干扰问题的解决方法
近年来,tv)在内的智能化系统在住宅小区建设中的应用越来越多,由于建筑物内外的电气环境比较复杂,容易形成各种干扰源,如果施工过程中未采取恰当的防范措施,各种干扰就会通过传输线缆进入闭路电视监控系统,造成视频图像质量下降、系统控制失灵、运行不稳定等现象。因此研究闭路电视监控干扰源的性质,了解对闭路电视监控系统的影响方式,并采取措施解决干扰问题对提高闭路监控系统工程质量、确保系统的稳定运行非常有益。
In recent years, including closed circuit television (CCTV) monitoring and control system, the application of the intelligent system in residential district construction more and more, because of the building inside and outside the electrical environment plex, easy to form various kinds of interference sources, if it fails to take appropriate preventive measures in the construction process, and all kinds of interference will be through the transmission cable into the closed-circuit television monitoring system, resulting in decreased quality of video image, the system control failure and unstable phenomenon such as running. So the closed-circuit television monitoring the nature of the interference sources, to understand the way the influence of closed-circuit television monitoring system, and measures to solve the problem of interference to improve engineering quality closed-circuit monitoring system, to ensure the stable operation of the system is very helpful.
2. The transmission medium and the method of video
video transmission medium
同轴电缆是使用最广泛的视频传输介质,一般用于中短距离的视频信号的传输。tv视频信号是由分布很广的低频信号和高频信号组成的)。传送低频信号(20赫兹到几千赫兹)时可以使用几乎任何种类的导线。在实际应用中,几乎所有导线都可以用作电话线。但要传送频率范围在20hz到6mhz之间的视频信号,同时不希望有任何衰减时,就需要使用同轴电缆。
Coaxial cable is the most widely used video transmission medium, commonly used in the short video signal transmission. Coaxial cable of the electrical characteristics of the makes it very suitable for transmit video cameras to monitor the whole video signal (CCTV video signal is a widespread) of high frequency and low frequency signals. Transmits low frequency signal (20 hz to several thousand hz) can use almost any kind of wire. In practice, almost all the wires can be used as a phone line. But to transmit f