说明：  一个求demon谱图的程序，对已知的采样信号找出其demon谱，从而找到里面的频率信息，已经封装为EXE程序，源代码是用MATLAB写的
(A program for demon spectra to known sampling signals to find the demon spectrum, frequency of inside information, has been encapsulated in the EXE program, source code is written in MATLAB)