基于MATLAB信号处理工具箱的IIR滤波器设计与仿真【推荐论文】.doc

基于MATLAB信号处理工具箱的 IIR滤波器的设计与仿真 摘要 在现今通信中，信号中总是夹杂着噪声和许多无用的频率成分，因此需要采用一定的方法将这些成分滤除，数字滤波器便是其应用。数字滤波器的工作原理是能够让特定频段的信号通过，其他频段则不能通过。 数字滤波器主要应用于通信，图像处理，语音编码，雷达等领域。 该设计的目的就是让我们的系统的掌握所学过的IIR滤波器设计的相关知识，熟悉MATLAB中相关的信号处理工具箱，熟练仿真软件simulink。本文首先对数字滤波研究背景、发展前景及MATLAB进行介绍；接着又介绍了对数字滤波原理，对滤波器进行分类；然后对IIR数字滤波方法进行了研究，紧接着开始设计数字滤波系统，利用PDATool工具进行界面设计；最后利用设计成果，设计 Simulink仿真模块对所设计的滤波器进行仿真，对一特定信号进行处理，对比滤波前后信号的失真情况，以此判断所设计滤波器是否满足设计要求。 关键词：IIR 滤波器 FDATool simulink Design and Simulation of IIR filter based on MATLAB signal processing toolbox ABSTRACT In the present communication, the signal always mixed with the noise and many useless frequency components, therefore need to use a certain method to filter these ingredients, digital filter is its application. The working principle of digital filter is able to let the signal of a specific frequency, other frequency can not through. Digital filter is mainly used in communication, image processing, speech coding, radar and other fields.. The purpose of the design is to let us master the knowledge of the IIR filter design, familiar with the signal processing toolbox in MATLAB, and skilled simulation software SIMULINK. At first, the background and development of the IIR filter is untroduced th. Then I talk aboute principle classification of the IIR filter; and studies the IIR digital filtering method, immediately began to design digital filter system, PDATool tool is used to design the interface; finally, using the design results, design Simulink module of the designed filter simulation, a special signal processing, contrast before and after filtering the signal distortion, in order to determine the designed filter can meet the design requirements. KEYWORDS: IIR filter FDATool Simulink 目 录 中文摘要 I 英文摘要 II 1 绪论 1 1.1 研究的背景及意义 1 1.2 数字滤波器的发展前景 2 1.3 MATLAB软件的简介 2 2 数字滤波器概述 4 2.1 数字滤波器简介 4 2.2 经典数字滤波器的分类 4 2.3 数字滤波器的主要设计指标 5 3 IIR数字低通滤波器设计方法的研究 7 3.1 IIR数字滤波器的设计步骤 7 3.2 IIR数字低通滤波器的直接设计法 8 3.2.1 设计方法及原理 8 3.2.2 MATLAB设计 9 3.2.3