有线电视台的播控中心要同时控制多个频道节目的播出。往往有一个由多个监视器组成的电视墙,每一个监视器监视一个频道节目的图像。这样,一旦某个频道的图像信号出现问题即可马上看到。但是如果是伴音出现问题,例如伴音中断,则不会被发现。显然,不可能将每个监视器的声音都开大 Cable television broadcast control center to simultaneously control the broadcast of multiple channel programs. There is often a video wall consisting of multiple monitors, each monitoring an image of a channel program. In this way, once a channel image signal problems can be seen immediately. However, if there are problems with the sound, such as sound interruption, it will not be found. Obviously, it is impossible to open the sound of each monitor