该算法对于只含奇次谐波分量的一类半波对称波形，省去了偶次谐波分量的计算。

The half-wave symmetric FFT algorithm can omit the even harmonics in its calculation, according to only have odd harmonics in the half-wave symmetric signals.

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在深入分析快速傅里叶变换(FFT)方法的基础上，针对一类电网信号具有半波对称性的特点，提出了一种改进的FFT算法。

After deeply studied in the fast Fourier transform (FFT) method, this paper presents an improved FFT algorithm considering the half-wave symmetric characteristic of power system signals.

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开发了变极性TIG焊电源的微机控制系统，通过调节输出电流的正负半波时间、幅值获得不对称方波。

The controlling system of the variable polarity power source for TIG welding by microprocessor-80C552 is developed with flexible setting time and scope of the DCEP and DCEN.

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