说明：  这是自己编写的频谱分析程序，不需要调用FFT，直接调用本程序即可，毕业设计的一部分，绝对运行没问题且效果好
(This is the spectrum analysis program to write your own, do not call the FFT, you can directly call the program, part of the design school is absolutely no problem and the effective operation)