基于MATLAB的FIR数字滤波器仿真设计研究

Research on simulation design of FIR digital filter based on MATLAB

基于数字信号中的干扰会对系统性能产生影响,实际工作中需要对信号进行处理,提取有用信号。FIR数字滤波器(有限长冲激响应)在数字信号处理中有着重要作用。文章研究了FIR数字滤波器的3种仿真设计,使用窗函数算法、频率采样算法和最优化设计算法,调用MATLAB函数设计FIR数字滤波器,根据仿真设计给出对应的幅频相频特性曲线,并对3种算法得到的FIR数字滤波器的滤波效果进行仿真结果分析。

The interference in digital signals will affect the system performance. In practical work, it is necessary to process the signals and extract useful signals. Current FIR digital filter(finite impulse response) plays an important role in digital signal processing.This paper studies three simulation designs of FIR digital filter, uses window function algorithm, frequency sampling algorithm and optimization design algorithm, calls MATLAB function to design FIR digital filter, gives the corresponding amplitude frequency phase frequency characteristic curve according to the simulation design, and compares the results of FIR digital filter obtained by the three algorithms the filtering effect is analyzed by simulation results.