由AR模型参数得到功率谱。AR，MA和ARMA是功率谱估计中最主要的参数模型。AR模型的正则方程是一组线性方程。-The AR model parameters obtained power spectrum. AR, MA and ARMA power spectrum estimation is the most important parameter model. Canonical equations AR model is a set of linear equations.

用Welch平均法对信号 作功率谱估计.welch法又称之为加权交叠平均法。是一种经典的功率谱估计方法。-By Welch method to estimate the power spectrum signal .welch method is also known as the weighted average method overlap. It is a classic power spectrum estimation method.