中文说明： 小波变换对非平稳信号进行多层分离，包括有求取每个频带的小波包系数，小波包分解计算能量， 画小波分频带图，对每个频带求取频谱，画出能量谱
English Description：
The multi-layer separation of non-stationary signals by wavelet transform includes the calculation of wavelet packet coefficients of each frequency band and the calculation of energy by wavelet packet decomposition,