说明：  hilbert变换程序，Hilbert通常用来得到解析信号，基于此原理，Hilbert可以用来对窄带信号进行解包络，并求解信号的瞬时频率。 本文内容多有借鉴他人，最后一并附上链接。
(Hilbert transform program, Hilbert is usually used to obtain analytical signals. Based on this principle, Hilbert can be used to de-envelope a narrowband signal and solve the instantaneous frequency of the signal.)