实现PWM 波的产生，可用于电机控制。
Realization of PWM wave generation, can be used for motor control.
NASA表示，这一抛物线设计可以通过控制气流来减少冲击波的产生。
The parabola would control air flow in a way that would lessen the shockwave, NASA says.
在深入探讨调制波的产生原理基础上，设计了一个基于乘法器的调制波发生电路。
The generation of modulation wave by wide band multiplier is designed after deep discussion on theory of the modulation wave generation.
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