中频解调器输出的基带信号,一路经低通滤波器滤除带外杂波和干扰,作为视频分量进入视频信号处理电路;另一路由带通滤波器滤波后进入音频信号处理电路。通常,视频信号处理电路应具有以下功能: ——对视频信号进行放大,使其达到所要求的1V(P-P)输出电平; ——滤除带外杂波和干扰信号,对视频信号进行去加重处理,恢复其原有频率响应,改善视频信噪比; The baseband signal output by the intermediate frequency demodulator is filtered out of the out-of-band clutter and interference by the low-pass filter to enter the video signal processing circuit as the video component; the other is filtered by the band-pass filter and then enters the audio signal processing circuit. In general, the video signal processing circuit should have the following functions: - Amplify the video signal to the required 1V (PP) output level; - Filter out-of-band clutter and interference signals to the video signal Increase processing, restore its original frequency response, improve the video signal to noise ratio;