3IIR数字滤波器的设计及应用.doc

教学单位 物理与电子信息工程学院 学生学号 012301234208 本科毕业论文（设计） 题 目 IIR数字滤波器的设计及应用 学生姓名 向晶晶 专业名称 电子信息工程 指导老师 王新民 2016年 05 月 06 日 IIR数字滤波器的设计及应用 摘要：IIR数字滤波器结构简单，运算速度快。在科技信息发展如此之快的今天，IIR数字滤波器在很多电子行业的应用是非常重要的。本课题的重点研究内容是IIR数字滤波器的设计。IIR数字滤波器的设计方法的介绍将是本课题的主要研究内容，一般IIR数字滤波器的设计方法有借助计算机与间接设计的。其中，间接设计法是：根据模拟滤波器经过某种转换来设计IIR数字滤波器。通常使用巴特沃斯滤波器，切比雪夫滤波器以及椭圆滤波器这三种滤波器作为过渡模拟滤波器，这三种中椭圆滤波器是最优的原型滤波器，但计算比较复杂。其次，本课题还介绍了由模拟滤波器转换为IIR数字滤波器的两种方案：即脉冲响应不法和双线性变换法。本课题重点介绍双线性变换法。本课题还简单介绍了使用FDA Tool工具箱设计来设计IIR数字滤波器，以及使用MATLAB 函数语言编程来设计的IIR数字滤波器并应用于语音噪声的处理中。 关键字：滤波器；IIR；双线性变换法；FDA Tool The design and application of IIR digital filter Abstract: IIR digital filter is simple in structure and fast in operation. With the rapid development of science and technology information, IIR digital filter is very important in the application of a lot of electronic industry. The key research content of this topic is the design of IIR digital filter. The introduction of the design method of IIR digital filter will be the main research content of this paper, and the design method of general IIR digital filter is designed with the aid of computer and indirect design. Among them, the indirect design method is: according to the analog filter after a certain conversion to design IIR digital filter. Usually using a Butterworth filter, Chebyshev filter and elliptic filter the filter as a transitional analog filter, the three elliptic filter is the optimal prototype filter, but the calculation is complex. Secondly, this thesis also introduces two kinds of schemes, which are converted from analog filter to IIR digital filter. This paper focuses on the bilinear transformation method. This topic also briefly introduces the use of Tool FDA toolbox design to design IIR digital filters, and the use of MATLAB language programming to design the IIR digital filter and applied to the processing of speech noise. Key words: Filter；Infini