本程序用来实现具体的fft运算，程序参考数字信号处理c语言描述这本书
这个程序利用旋转因子可以先算下来的特征，可以在大量数据处理时节省时间
-This procedure used to realize specific fft computing, digital signal processing procedures reference c language to describe this book, this process can make use of rotating factor算下来features, can handle large amounts of data to save time when
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