一种适合在单片机上运行的快速傅里叶算法，大量采用查表方法。理解这个算法对实现电力谐波分析很有帮助。fft算法的经典应用，需要一定的数学知识！-Fit on a single chip running at the fast Fourier algorithm, a large number of look-up table method used. Understanding of this algorithm to achieve u