modulated continuous wave
键控调制等幅波 modulated keyed continuous waves
音调调制等幅波 continuous wave modulated by sound
(正弦脉宽调制)是由控制回路产生一组等幅而不等宽的矩形脉冲列，用来近似正弦电压波。
SPWM is a set of constant amplitude but unconstant width rectangular serial pulse produced by control return circuit to approximate sinusoidal voltage waves.
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