众所周知由于自动屏调机调制特性的非线性,造成了自动屏调发射机失真严重的特殊问题,有时严重到不可容忍的程度。过去为了改善它的非线性失真,在现有的设备中都采用了补偿管和负回授的方法。经过补偿后的音频信号的频谱展宽了,出现了原来没有的直流分量 It is well-known that due to the non-linearity of the modulation characteristics of automatic screen machines, special problems with serious distortion of the automatic screen transmitters have been caused, sometimes to the point of intolerable levels. In the past, in order to improve its nonlinear distortion, compensating tubes and negative feedbacks were used in existing devices. The spectrum of the compensated audio signal is broadened, and the original DC component is not present