求功率谱估计常用的几种方法，包括周期图法，Welch 法，和AR模型法。,For power spectrum estimation commonly used in several ways, including periodogram, Welch law, and the AR model.

相关图法谱估计，在使用MATLAB进行谱分析时可以用周期图法也可以用相关图法，这个代码对这两个方法进行了比较仿真，发现结果相差不大。基本相同-Correlogram spectral estimation method

MATLAB代码经典功率谱估计，Welch法、协方差法、周期图、burg法及其对比，附完整注释(MATLAB code, classical power spectrum estimation, Welch method, covariance method, periodogram, Burg method and their comparison, with complete annotation.)