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电视台播控中心一般要对各种播出节目源进行选择、切换和直播。针对节目准确安全播放，提高工作效率，降低值班人员手工操作、笔者设计了一个视音频切换的自动化系统。本系统的信号源主要取自录像机、演播室信号、字幕图形发生器信号和同步信号发生器产生的黑场信号和测试信号?
Television broadcasters generally have to choose from a variety of broadcast sources, switch and broadcast. For the program safe and accurate playback, improve work efficiency, reduce manual duty on duty, the author designed an audio and video switching automation system. The system’s signal source is mainly taken from the video recorder, studio signal, subtitle graphics generator signal and the synchronization signal generator to generate black signal and test signal?