视频低通滤波器及去重网络对图像信号的影响

Effect of Video Lower Pass Filter and De-emphasis Network on Image Signal

在目前的卫星电视接收机中,由于视频处理电路大都采用同一视频低通滤波器和去重网络去接收处理不同制式的卫星电视信号,导致了信号的幅频失真和信噪比恶化,影响了图像信号的质量.本文对此进行理论分析,并提出改进措施.

Satellite television receiver is one of the most important devices for receiving satellite TV. In the current satellite television receivers, the video processing circuit receives satellite television signals of different systems on the same video lower pass filter and De-emphasis network, which leads to amplitude frequency distortion and signal-to-noise deterioration of the signals. This has affected the quality of image signals. This paper gives a theoretical analysis to this issue and puts forward improving measures.