基于Matlab的DFT及FFT频谱分析

Spectrum Analysis of DFT and FFT Based on Matlab

DFT及FFT是数字信号处理的重要内容。DFT是FFT的基础,FFT是DFT的快速算法,在MATLAB中可以利用函数FFT来计算序列的离散傅里叶变换DFT。基于此首先介绍了Matlab软件;其次给出了基于Matlab软件的DFT和FFT频谱分析的方法,利用Matlab软件方法,使得设计方便、快捷,大大减轻了工作量;最后结合实例给出了仿真结果。

DFT and FFT is one of the most important parts in digital signal processing.DFT is the basis for FFT and FFT is the fast algorithm of DFT.The DFT of sequence can be calculated by using the function of FFT in MATLAB.In this paper,the software of Matlab is studied firstly,then the way of DFT and FFT spectrum analysis based on Matlab is given;by using Matlab,the designing becomes easy and shortcut,the workload is reduced greatly.The simulation results are given with example finally.