对建立的AR模型，利用Levinson-Durbin递归公式计算了模型参数，对输入信号的功率谱密度进行了估计，并绘制了信号的时域图和功率谱图。(For the established AR model, the Levinson-Durbin recursive formula is used to calculate the model parameters, and the power spectral density of the input signal is estimated, an