一维离散功率谱分析求一维序列x(n)的离散Fourier谱分析，s(0:m)离散功率谱，c(0:m)振幅谱，cta(0:m)位相谱，其中m=[n/2.]。 -One dimensional power spectrum analysis of one-dimensional sequence of demand x (n) the discrete Fourier spectrum, s (0: m) discrete power spectrum, c (0: m) amplitude spectrum, cta (0: m) phase spectrum, which m = [n/2.].