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大功率广播发射机目前世界上最为先进的调制方式就是采用顺序脉冲阶梯调制方式（以下简称PSM机），它的机理是发射机的主整电压化整为零，用数字化直流信号和音频信号控制主整输出电压的大小，从而使被调级获得载波输入功率和音频调制功率。与屏调调幅广播发射机相比较，PSM机
The most advanced modulation method of high-power broadcast transmitter in the world is to adopt the sequential pulse ladder modulation method (hereinafter referred to as PSM machine). Its mechanism is that the main voltage of the transmitter is totally zero and controlled by the digital DC signal and the audio signal Master the size of the output voltage, so that was adjusted to obtain the carrier input power and audio modulation power. Compared with the screen amplitude modulation broadcast transmitter, PSM machine