基于MATLAB的数字滤波器设计与仿真

Digital filter design and simulation based on MATLAB

数字滤波器是线性时不变数字信号处理系统中重要的一类,其设计目的是修改输入信号的频率特性以满足特定的设计要求,这已成为信号分析研究的一个重点。因此,文章在总结分析数字信号处理研究的基础上,对FIR滤波器与IIR滤波器进行了比较分析,利用MATLAB信号处理工具箱(FDATool)设计了包含6个简单FIR数字滤波器的音频均衡器,并利用Simulink进行了仿真实验分析。通过对某段声音信号进行滤波,实现改变输出电压信号的变换来达到控制噪声的效果。使用MATLAB的工具箱可以快速设计数字滤波器,动态调整设计参数,实现设计目标。

Digital filter is an important type of linear time-invariant digital signal processing system.Its design purpose is to modify the frequency characteristics of the input signal to meet specific design requirements,and it has become a focus of signal analysis research.Therefore,on the basis of summarizing and analyzing the research of digital signal processing,this paper compares and analyzes the FIR filter and IIR filter,and uses the MATLAB signal processing toolbox(FDATool)to design an audio equalizer including six simple FIR digital filters.And the simulation experiment analysis was carried out using Simulink.By filtering a certain segment of the sound signal,the transformation of the output voltage signal is realized to achieve the effect of controlling the noise.Using MATLAB’s toolbox,you can quickly design digital filters,dynamically adjust design parameters,and achieve design goals.