Written by a foreigner, pure C, look above in the research study is a wholly

代码说明：

一个外国人写的，纯C，在研学上面看的全是C++和MATLAB的代码，里面有1DFFT, 2DFFT, 以及各种频率域滤波器-Written by a foreigner, pure C, look above in the research study is a wholly-C++ And MATLAB code, which has 1DFFT, 2DFFT, and a variety of frequency-domain filter