根据IIR数字滤波器的设计原理

根据IIR数字滤波器的设计原理 根据IIR数字滤波器的设计原理，提出了IIR数字滤波器的快速设计方法，并在matlab环境下做出了实 现快速设计IIR 数字滤波器的设计系统.在该系统中，只需要将数字滤波器的技术性能指标根据指定的或 是需要的设计方法(如双线性变换法或脉冲响应不变法等)，转换为模拟滤波器的技术性能指标，根据指定 的模拟滤波器设计出相应的数字滤波器，该系统中指定的模拟滤波器为巴特沃斯滤波器和切比雪夫滤波器， 该系统为快速、高效地设计IIR数字滤波器提供了一个可靠而有效的工作平台. 本文首先对MATLAB软件进行了介绍，并对数字滤波器在其环境下如何实现进行了介绍;其次描述了数字 滤波器的基本概念，其包括系统的描述、系统的传递函数、基本结构运算单元;本文重点描述了IIR数字 滤波器的设计过程及几种设计方法，并对IIR滤波器的仿真做了一些介绍。 The fast design method of IIR(Infinite Impulse response)filter is provided based on the principle of filter design, and the design system of the IIR filter worked out under the MATLAB environment. It is necessary that the parameter of digital filter is transformed to the parameter of analog filter based on the indicated method (for example, the method of double linear transform or the method of non-changing impulse response, etc.),and the digital filter is designed based on the indicated analog filter. The Butterworth filter and the Chebyshev filter(both are analog filter)are indicated. A reliable and efficient work station is provided in order to design filter quickly and efficiently. First this text carries on the introduction to the software of MATLAB, and describes the design of digital filter based on MATLAB ;Describes the basic concept of the digital filter the next in order, it includes the description of system,delivering function of the system,the basic structure operation unit;This text point describes design process and several design methods of the IIR digital filter and the simulation of the IIR filter to do some introduction. 传统的数字滤波器的设计过程复杂，计算工作量大，滤波特性调整困难，影响了它的应用。本文介绍了一 种利用MATLAB信号处理工具箱(Signal Processing Toolbox)快速有效的设计由软件组成的常规数字滤波 器的设计方法。给出了使用MATLAB语言进行程序设计和利用信号处理工具箱的FDATool工具进行界面 设计的详细步骤。利用MATLAB设计滤波器，可以随时对比设计要求和滤波器特性调整参数，直观简便， 极大的减轻了工作量，有利于滤波器设计的最优化。本文还介绍了如何利用MATLAB环境下的仿真软件 Simulink对所设计的滤波器进行模拟仿真。介绍了IIR数字滤波器的传统设计思想与步骤,及其计算机辅助 设计方法。以一数字带通滤波器为例,着重说明了基于MATLAB的三种实现手段:模拟低通原型、合适模 拟带通及直接原型,为数字滤波器设计带来全新的实现手段,设计快捷方便,仿真波形直观。 Traditional digital filter design process complex, the computationwork load is big, the filter characteristic adjustment difficulty, hasaffected its application. This article introduced one kind using theMATLAB signal processing toolbox (Signal Processing Toolbox) the fasteffective design the conventional numeral filter design method whichis composed by software. Produced has used the MATLAB language tocarry on the programming and carries on contact surface design usingthe signal processing toolbox FDATool tool the detailed step. Usingthe MATLAB design filter, may contrast the design request and thefilter characteristic adjustment parameter as necessary 数字滤波器在数字信号处理领域中已经得到广泛应用，利用MATLAB的数字滤波器设计工具箱可以快速有 效地设计各种FIR/IIR数字滤波器，设计简单方便。在设计过程中可以随时对比设计要求和滤波器特性，并 可通过不断调整参数，以使滤波器的设计达到最优化 The digital filter has already been applied widely in many fields of the digital signal processing. All kinds of FIR/IIR digital filters can be designed quickly and effectively with the help of MATALB digital filter design toolbox - FDATool. In the course of designing digital filter, we may often compare the design result with the design requirement and filter characteristics, and then may adjust the design parameters for the optimization of the FIR/IIR digital filter design