本程序是功率谱密度的仿真比较,关于三个信号源的具体情况参见《现代数字信号处理导论》上册，P202，习题5。 实验方法：周期图法、自相关法和协方差法。 -this procedure is the power spectral density of the simulation, 3 signal source on the specific circumstances, see the "modern digital

用MATLAB进行的功率谱估计，通过几种方法的比较进行对比分析各种方法的优缺点-Carried out using MATLAB power spectrum estimation, by comparison of several methods to compare the advantages and disadvantages of various methods