基于 matlab 的数字滤波器设计摘要: 本文介绍的是数字滤波器在 MATLAB 环境下的设计方法。数字滤波是数字信号处理的重要内容,在实际应用中有非常大的作用。我们研究的数字滤波器可分为 IIR 和 FIR 两大类。对于 IIR 数字滤波器的设计, 我们需要借助模拟原型滤波器,然后再将模拟滤波器转化为数字滤波器,文中采用的设计方法是脉冲响应不变法、双向性变换法和完全函数设计法;对于 FIR 数字滤波器的设计, 可以根据所给定的频率特性直接设计,文中采用的设计方法是窗函数法。根据 IIR 滤波器和 FIR 滤波器的特点,本文在 MATLAB 坏境下分别用双线性变换法设计 IIR 和用窗函数设计 FIR 数字滤波器,并让这两种滤波器对采集的语音信号进行分析和比较,经过分析,最后给出了 IIR 和 FIR 对语音滤波的效果,并总结这两种滤波器在 MATLAB 环境下设计方法的优缺点。关键词: 数字滤波器; IIR ; FIR ; MATLAB The Design of Digital Filter based on MATLAB Abstract : This article describes a digital filter in the MATLAB environment design. Digital filtering is an important part of digital signal processing which is playing a very big role in practice .The digital filter we studied can be divided into two categories —— IIR and FIR. For the IIR digital filter design, we will need the help of simulation prototype filter, analog filters and then converted it into digital filter For the IIR digital filter design .The design methods used in the text is the same impulse response method, bi-sexual transformation and full function design ;We can based on the frequency characteristics of the given direct design, design method used in the text is the window function for FIR digital filter design. Based on the characteristics of IIR filter and FIR filters ,the bad paper in the MATLAB environment under the bilinear transformation method were used to design IIR and FIR with window function digital filter design and filters to capture both the voice signal analysis pare. Through analysis of IIR and FIR Finally, the effect of filtering on the speech, and concluded the advantages and disadvantages in the two filter design methods in the MATLAB environment. Key words: Dig i tal Filter ; IIR ; FIR ; MATLAB 目录 1引言............................................................................................................................. 1 2数字滤波器及 MATLAB 语言概述............................................................................... 2 数字滤波器的定义和分类......................
