一个快速傅里叶变换的实例。通过快速傅里叶变换实现信号的频率幅值等信息。-Examples of a fast Fourier transform. Fast Fourier transform by the frequency of the signal amplitude and other information.

快速傅里叶变换，绘制幅值谱，直接输入信号离散-Drawing amplitude spectrum

快速傅里叶变换，说明了原理及实现的全过程-Fast Fu Liye transform, the principle and implementation of the entire process

求出的傅里叶变换。画出其幅频特性和相频特性曲线（提示：用1024点FFT近似） -Seek out the Fourier transform. Draw its amplitude frequency characteristic and phase frequency characteristic curve (hint: use 1024 point FFT approximation)