说明：  基于经验模态分解法（EMD）的Hilbert-Huang变换（HHT）的MATLAB程序。 可将非平稳信号转换为平稳信号，通过将IMF分量累加重构得到平稳信号 。 主程序为HHT.m，需要用到hhspectrum.m函数、instfreq.m函数（在压缩包内）和已安装的EMD工具箱中emd函数。
(The empirical mode decomposition (EMD) method based on Hilbert-Huang transform (HHT) of the MATLAB program. The non-stationary signals can be converted into stationary signals, and the stationary signals can be obtained by accumulating and reconstructing the IMF components. The main program is HHT.m, which requires the hhspectrum.m function, the instfreq.m function (in the compressed packet) and the EMD function in the installed EMD toolbox.)