中文说明：我根据倒频谱的定义和matlab，给出了几种倒频谱的计算，程序如下（可在matlab直接使用 ）。但是，从获得的图象还是找不出我要找出的频率。
English Description：
According to the definition of Cepstrum and MATLAB, I give several kinds of cepstrum calculation, the program is as follows (can be used directly in Matlab). However, I can't find the frequency I want to find out from the image.