插值与拟合，解方程，数据分析，分析了该信号的时域、频域、倒谱，循环谱等,包括最小二乘法、SVM、神经网络、1_k近邻法。- Interpolation and fitting, solution of equations, data analysis, Analysis of the signal time domain, frequency domain, cepstrum, cyclic spectrum, etc. Including the least squares method, t