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五、电视差转机滤波器在多山和偏远地区,电视广播需要很多差转站.并且常常采用多站接力方式使用电视差转机.日本NHK公司有五千多个这种差转站,但多站接力的数量目前最多是七个.我国幅员辽阔,随着电视广播事业的发展,需要的差转站数量之多是不难想象的.差转机中有带通滤波器,陷波滤波器(用来抑制邻频道载频)和图象-伴音载频电平均衡器.这些器件都会引起群延时畸变.并且,当使用多站接力差转系统时,
TV Difference Filters In mountainous and remote areas, television broadcasting requires a lot of poor transfer stations, and often uses a multi-drop relay system to use a TV transfer machine. Japan NHK has more than 5,000 such transfer stations, but many The number of station relay is currently up to 7. China’s vast territory, with the development of television broadcasting, the need to change the number of stations is not difficult to imagine the difference in the band-pass filter, notch filter ( Used to suppress the adjacent channel carrier frequency) and image-sound carrier frequency level equalizer. These devices will cause group delay distortion. And, when using multi-station relay differential transfer system,