中文说明：
仿真信号的FFT频谱和功率谱，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：
The simulation signal FFT spectrum and power spectrum, mapped the emd decomposition results, instantaneous frequency and instantaneous envelope and figure, and I - Huang Hilbert spectrum and Hilbert marginal spectrum.