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笔者在使用视音频切换器时 ,发现数字卫星接收机输出的视频信号通过切换器产生了失真。经过检查分析 ,发现原来数字卫星接收机输出的视频信号与模拟卫星接收机和录像机输出的信号有所不同 ,它含有直流电压 ,在输出口测出电压 2 .5Ｖ。这个直流电压进入切换器 ,改变了切换器输入
When I use video and audio switcher, I found that the digital satellite receiver output video signal generated by the switch distortion. After examination and analysis, we found that the original digital satellite receiver output video signals and analog satellite receivers and recorders output signal is different, it contains a DC voltage, the output voltage measured 2.5V. This DC voltage enters the switch, changing the switch input