HHT(hilbert Huang-transfrom)可以实现同时对信号的时频分析，得到信号的Hilbert时频谱和能量谱，-HHT (hilbert Huang-transfrom) can achieve the same time, the time-frequency analysis, when the signal spectrum and Hilbert energy spectrum

用希尔伯特黄变换（HHT）求时频谱和边际谱.包括代码、原理、截图分析-Hilbert Huang transform (HHT) Find the spectrum and marginal spectrum, including the code, schematic, screenshot analysis

用希尔伯特黄变换（HHT）求时频谱和边际谱-Using Hilbert Huang transform (HHT) to find the spectrum and marginal spectrum