中文说明：
包含有希尔伯特黄变换的主程序、边际谱的计算方法、并绘制了仿真信号的FFT频谱和功率谱，并调用emd分析方法，绘制了emd分解结果，以及瞬时包络和瞬时频率图，还有Hilbert-Huang谱和Hilbert边际谱
English Description：
It includes the main program of Hilbert Huang transform, the calculation method of marginal spectrum, and draws the FFT spectrum and power spectrum of the simulation signal. It also calls the EMD Analysis Method to draw the EMD decomposition results, as well as the instantaneous envelope and instantaneous frequency diagram, as well as the Hilbert Huang spectrum and Hilbert marginal spectrum