本程序为基于FFT快速傅里叶积分的程序，可以通过改程序将所需频率的信号在频域进行分离。-This program is based on FFT Fast Fourier integral program, you can change the program by the required frequency of the signal in the frequency domain separation.

傅立叶变换是一种线性的积分变换，常在将信号在时域（或空域）和频域之间变换-Fourier transform is a kind of linear integral transform, often in the signal in time domain or airspace and frequency domain