选择从三种类型的调制波形为颤音。
Select from three types of modulation waveforms for the tremolo.
介绍了如何利用DDS技术来产生调频波形及其他的数字调制波形；
This paper introduces how DDS techniques can be extended to produce frequency modulated(FM)waveforms as well as many types of digitally modulated waveforms.
该系统由数字控制器、脉宽调制波形显示电路、全桥变换器、直流电动机和光电编码器。
The system consists of a digital control system, a PWM control waveform display, a full-bridge converter, a DC motor and load motor.
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