基于MATLAB的IIR数字滤波器的设计与仿真  

Design and simulation of IIR digital filter based on MATLAB

作　　者：谢芳[1] 陆文骏 Xie Fang;Lu Wenjun(College of Electrical Engineering,Anhui Sanlian College,Hefei 230601,China)

机构地区：[1]安徽三联学院电子电气工程学院,安徽合肥230601

出　　处：《湖南文理学院学报（自然科学版）》2022年第3期39-42,58,共5页Journal of Hunan University of Arts and Science(Science and Technology)

基　　金：安徽三联学院校级科研项目(PTZD2021018)。

摘　　要：采集到的脉搏信号中通常有人体呼吸等低频噪声干扰及工频和其他高频干扰,只有将噪声信号进行滤波才能对脉搏信号进行谱分析、特征值的提取等后续分析,为解决脉搏信号含噪声问题,提出采用双线性变换法设计无限长单位脉冲响应IIR数字滤波器,并借助MATLAB软件仿真3种不同类型滤波器的幅频特性图,结果表明设计的IIR数字滤波器能够滤除0~1 Hz以及20 Hz以上的高频干扰信号,其中巴特沃斯型滤波器的滤波效果最好。The collected pulse signals are usually interfered by low frequency noises such as human respiration,power frequency and other high frequency interferences.Only by filtering the noise signals can the pulse signals be analyzed by spectrum analysis,extraction of eigenvalues and other follow-up analyses.In order to solve the problem of noise in pulse signals,a bilinear transform method is proposed to design infinite length unit impulse response IIR digital filter,and the amplitude-frequency characteristics of three different types of filters are simulated with Matlab software.The results show that the designed IIR digital filter can filter high frequency interference signals of 0~1 Hz and above 20 Hz,and the Butterworth Filter is the best.

关 键 词：双线性变换法 数字高通滤波器 数字低通滤波器 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置]