混合基快速傅里叶算法实现，针对任意长信号序列，按照预设分解成不同的基进行预算，减少除法与三角函数使用，精度高速度快。-Mixture Fast Fourier-based algorithm for arbitrarily long signal sequence, in accordance with the different pre-set into the base budget and reduce the use of division and the trigonometric f