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近年来,闭路电视发展很快,许乡单位都在自办节目,要保证播出质量,视频切换设备必不可少。本文介绍的是单片微机控制的视频信号自动切换系统,该系统能使自办节目全自动播出。自办节目每次播出内容有多种,而且录像机和录像带的规格也可能各不相同。换带要准确可靠,自动切换机必须准时开启或关闭每台录像机和打开视频电子开关。为了能够控制各种规格的录像机,切换机以继电器方式输出达到控制录像机的目的。切换机给每
In recent years, the rapid development of CCTV, Xu township units are running their own programs, to ensure the broadcast quality, video switching equipment is essential. This article describes the single-chip computer-controlled automatic switching video signal system, the system enables self-run programs automatically broadcast. There are various types of programs that are run on a daily basis, and the specifications of VCRs and videotapes may vary. To change the tape to be accurate and reliable, automatic switch must be on or off on time each video recorder and turn on the video electronic switch. In order to be able to control a variety of video recorders, switchboard relay output to achieve the purpose of controlling the video recorder. Switch to each