快速傅氏变换，是离散傅氏变换的快速算法，它是根据离散傅氏变换的奇、偶、虚、实等特性，对离散傅立叶变换的算法进行改进获得的-Fast Fourier transform, discrete Fourier Transform Algorithm, which is the discrete Fourier transform of the odd and even, true, real and other properties, on the discrete Fourier transform