基于Matlab的IIR数字滤波器设计(毕业论文).doc

基于Matlab的IIR数字滤波器设计(毕业论文) 摘 要在现代通信系统中，由于信号中经常混有各种复杂成分，所以很多信号分析都是基于滤波器而进行的，(IIR)数字滤波器和有限长冲激响应(FIR)数字滤波器。实现IIR滤波器的阶次较低，所用的存储单元较少，效率高，精度高，而且能够保留一些模拟滤波器的优良特性，因此应用很广。M软件以矩阵运算为基础，把计算可视化及程序设计有机融合到交互式工作环境中，并且为数字滤波的研究和应用提供了一个直观、高效、便捷的利器。尤其是Matlab中的信号处理工具箱使各个领域的研究人员可以直观方便地进行科学研究与工程应用。本文MATLAB函数语言编程，信号处理图形界面FDATool来设计滤波器Sptool界面设计法，并用FDATool模拟IIR数字滤波器处理信号介绍最优化设计IIR 滤波器FDATool Sptool Simulink  ABSTRACT In modern communication systems, Because often mixed with various signal complex components, So many signal analysis is based on filters, and the digital filter is realized through numerical computation, digital filters filter with high precision, stability and flexibility, dont exist, can realize the impedance matching simulating the special filter cannot achieve filter function. Digital filter according to its impulse response function and characteristics of the time can be divided into two kinds, namely the infinite impulse response (IIR) digital filter and finite impulse response (FIR digital filters). The order of realizing IIR filter is used, low and high efficiency less storage unit, high precision, and can keep some simulation characteristics of filter, so it is widely used. Matlab software based on matrix computation, the calculation, visualization and program design of organic integration to interactive environment for digital filter, and the research and application of provides an intuitive, efficient and convenient tool. Especially in the Matlab signal processing to all areas of research toolbox personnel can easily for scientific research and engineering application. This paper introduces the concept of digital filter, classification and design requirements. Then using MATLAB language programming, with functions of signal processing FDATool graphical interface design of interface design and Sptool filter, and FDATool analog signal processing IIR digital filter. Key design Chebyshev type I and II digital Chebyshev lowpass filter, and introduces optimization design