说明：  该程序绘制了仿真信号的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。
(The program draws the FFT spectrum and the power spectrum of the simulated signal and call emd analysis, drawn emd decomposition and instantaneous envelope and instantaneous frequency plot, as well as Hilbert-Huang spectrum and Hilbert marginal spectrum.)