中文说明：此方法使用经验模态分解方法对信号进行分解。根据 EMD 理论信号被分解为固有模态函数 （IMF） 是特定频率的信号频谱成分。
English Description：
This method decomposes the signal using empirical mode decomposition. According to EMD theory signal is decomposed into intrinsic mode functions (IMF) which are particular frequency components of the signal spectrum.