用Matlab分析“频率混迭”现象

Analyze“Frequency Mixing” by Using Matlab

首先介绍了离散傅立叶变换及快速傅立叶变换的基本原理,然后通过一个Matlab实例说明快速傅立叶变换由于采样频率低引起的“频率混迭”现象,提出了快速傅立叶变换对采样频率的要求。

This paper introduces the principle of discrete fourier transform and fast fourier transform, expatiates a phenomenon of frequency mixing caused by low sampling frequency with a Matlab example, and proposes the necessity of sampling frequency in FFT.