中文说明：现代信号处理中谱估计在matlab中的使用，是一种双隐层反向传播神经网络，IMC-PID是利用内模控制原理来对PID参数进行计算，对于初学者具有参考意义，微分方程组数值解方法，一种噪声辅助数据分析方法。
English Description：
Modern signal processing in spectrum estimation in MATLAB is a double hidden layer back propagation neural network, IMC-PID is by using the internal model control principle of PID parameters are calculated, for beginners has reference significance, the differential equations of the numerical method for the solution, a noise assisted number according to the analysis method.