hht程序代码，小波变换，对比分量的功率谱密度函数图，找出最优小波-hht code, wavelet transform, as compared with the weight of the power spectral density function map to find the optimal wavelet

针对HHT中存在的边界效应，提出了镜像拖延发改进EMD的分解过程。并提供了英文原版文献便于理解。适用于HHT研究的提高研究学习-improved HHT base on masking technology. in order to reduce the end effect in hilbert huang transform