中文说明：本Matlab程序采用较常使用的信号分析方法--希尔伯特变换方法，对信号进行分解，用于求取信号瞬时频率和信号的突变时刻，效果明显，有很好的作用！
English Description：
This matlab program uses the commonly used signal analysis method -- Hilbert transform method to decompose the signal, which is used to calculate the instantaneous frequency of the signal and the mutation time of the signal. The effect is obvious and has a good effect!