主要编写的快速傅里叶变换和Hilbert变换求瞬时频率的程序，很多文献中做时频分析都用到，其中Hilbert变换值得研究。-Written mainly fast Fourier transform and Hilbert transforms the instantaneous frequency of the program, a lot of literature to do time-frequency analysis are used, in which Hilbert transform worth studying.