解决监控系统中视频干扰的方法

归纳了监控系统中常见的视频干扰现象,分析了干扰产生的途径和原因,介绍了针对不同情况采取相应措施解决干扰问题的方法.对系统加装抗干扰滤波器抑制供电电源的干扰;提高视频信号源的输出电平、实现阻抗匹配、采用低噪声放大器、提高施工质量等抑制系统本身的干扰;采用单端接地法、在视频信号传输回路中接入一只高频变压器抑制地电位干扰,研制了视频隔离均衡放大器.对提高监控系统工程质量,确保系统的稳定运行非常有益.

Solution to Video Interference in CCTV

Common video interference phenomenon in CCTV is concluded.Ways and causes of producing interference are analyzed.Corresponding measures to solve this problem are introduced on the basis of different situations.These measures are as follows:to install an anti-interference filter in the system so as to suppress the interference from the supply source;to suppress the interference from the system itself by raising the videosignal source output level,matching the impedance,adopting the low noise amplifier and improving the construction quality;to suppress the interference from the earth potential by using single-end grounding and connecting a high-frequency transformer in the videosignal transmission circuit and to develop a video isolated equalization amplifier.All these are very helpful to improve the CCTV project quality and ensure the system's smooth operation.