功率谱估计的各种方法，包括经典法和现代法的matlab实现，不是通过调用函数，而是根据算法的思想实现的，希望对大家有用。-The power spectrum estimation methods, including the classic method and modern method of Matlab implementation, not by calling the function, but according to the idea of ​ ​ the algorithm to achieve, and the hope that useful.