中文说明：附件是5个matlab FFT的例程，使用matlab 2016b实测运行正常，主要是模拟离散快速傅里叶变换，直观的输出频谱图。对理解傅里叶变换非常有帮助。
English Description：
Attachment is five matlab FFT routines, using MATLAB 2016b measured normal operation, mainly simulation of discrete fast Fourier transform, intuitive output spectrum. It is very helpful to understand Fourier transform.