Digital design is the main character of this system. The three-phase SPWM pulses are generated through sine wave compared with triangular wave.

数字化设计是本系统的特点，系统最终生成的三相spwm脉冲是基于三相正弦调制波和三角载波比较得到的。

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Using correlative technique to detect the sine wave in yawp is a good method for picking up certain signal from yawp jam, which can determine the size and phase of signal.

埋藏在噪声中的正弦波，利用相关技术进行检测，能够测定信号的大小和相位。

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The system adopts direct digital synthetic (DDS) technology for building the sine wave generator to realize continuous regulation of amplitude, frequency and phase modulation.

系统采用直接数字合成（DDS）技术构建正弦波发生器，实现幅值、频率、相位等连续调节；

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