说明：  Hillbert-Huang变换是近年来一种新兴的信号分析方法,由于该方法是从信号本身的尺度进行分解,与传统的傅里叶变换方法有着本质的不同,Hilbert-Huang变换在处理非平稳信号方面有着巨大的优势。
(Transformation of Hillbert-Huang in recent years a new signal analysis method, because the method is the decomposition of the scale of the signal itself out, and the traditional Fourier transform method with the essence of different Hilbert Huang Transform in non-stationary signal processing has a huge advantage.)