分析了该信号的时域、频域、倒谱，循环谱等,BP神经网络用于函数拟合与模式识别，计算晶粒的生长，入门级别程序。- Analysis of the signal time domain, frequency domain, cepstrum, cyclic spectrum, etc. BP neural network function fitting and pattern recognition, Calculation of growth, entry-level program grain