为了监视各播出频道的播出情况 ,大部分有线电视播出机房中都有电视墙。但电视墙监视存在以下缺点 :1.因频道众多 ,无法监听声音 ,且每个频道的声音大小无可比性。2 .电视墙上各电视存在差异 ,电视信号的黑电平、对比度、饱和度无可比性。3.造价高 ,占地面积大 ,发热严重 ,需大 In order to monitor the broadcast of each broadcast channel, most of the cable television room has a TV wall. But the TV wall surveillance has the following disadvantages: 1. Due to the large number of channels, the sound can not be monitored, and the sound volume of each channel is incomparable. There are differences between the TV wall TV, TV signal black level, contrast, saturation is incomparable. 3 high cost, covers an area of ​​large, serious fever, to be large