数字信号处理课程中频率分辨率的教学探讨  

作　　者：张腾达[1] 董敬涛[1] 杨蕾[1] 卢荣胜[1] 张育中 

机构地区：[1]合肥工业大学仪器科学与光电工程学院,安徽合肥230009

出　　处：《高教学刊》2022年第1期87-91,共5页Journal of Higher Education

基　　金：安徽省级质量工程项目“光电信息工程教学团队”(编号:GRTD1906)。

摘　　要：频率分辨率是数字信号处理课程中的一个重要概念,因为它对DFT参数的选择有着重要影响。在教学过程中,容易将频率分辨率和计算分辨率相混淆。文章首先介绍了频率分辨率和计算分辨率的基本概念,然后以含有等幅的两个单频的信号为例,对DFT何时能分辨两个等幅单频信号的谱峰和序列尾部补0的作用进行了详细分析,并对相应MATLAB仿真结果进行论证。Frequency resolution is an important concept in the course of digital signal processing,because it has an important influence on the selection of DFT parameters.In the teaching process,it is easy to confuse frequency resolution with computational resolution.Here,the basic concepts of frequency resolution and computational resolution are firstly introduced.Then,a signal containing two single-frequency components with equal amplitude is used to demonstrate the way to distinguish the spectral peaks of the signal using DFT and the role of the supplemental zero at the end of the sequence of the signal.Finally,we verify the results using MATLAB simulation.

关 键 词：数字信号处理 频率分辨率 DFT 计算分辨率 MATLAB 

分 类 号：G642[文化科学—高等教育学]