A type of electronic modulation in which the phase of a carrier wave is varied in order to transmit the information contained in the signal.
相位调制，调相：一种电子调幅，为了传递包含在信号中的信息，而使载波的相位改变。
Pulse Width Modulation electronic speed control for highest efficiency.
脉宽调制效率最高的电子速度控制。
If the modulation rate is high, it is possible to smooth out the pulse train using passive electronic filters and recover an average analog wave form.
如果调制率高，是有可能顺利进行，脉冲列车使用被动电子过滤器和收回平均模拟波形。
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