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(上接第 2 4期 )3 极性倒换和低通滤波电路分析全电视信号有正极性和负极性 2种。正极性是指电压升高时亮度增加 ;负极性是指电压升高时亮度降低。实际上只要把正极性的全电视信号倒个相就成了负极性全电视信号。不同的电视传输制式决定了采用不同的全电视信号的极性 ,通常只
(Continued on the 24th) 3 Polarity switching and low-pass filter circuit analysis Full TV signal has two kinds of positive and negative polarity. Positive polarity refers to the brightness increases when the voltage increases; negative polarity refers to the brightness decreases when the voltage increases. In fact, as long as the positive full-color television signal phase down into a negative full-TV signal. Different TV transmission systems determine the polarity of different full TV signals, usually only