在MATLAB上，用傅立叶变换、自相关函数法以及最大熵估计法对一组离散的时间序列进行谱分析，并作出对应的频谱图，进行比较。-In MATLAB, using Fu Liye transform, autocorrelation function method and maximum entropy estimation method for a series of discrete time series spectral analysis, and make the corresponding spectrum map, for comparison.