毕业设计(论文)-IIR数字滤波器的MATLAB设计与实现.docVIP

菏泽学院本科毕业生设计（论文） PAGE 10 PAGE 11 PAGE 10 IIR数字滤波器的MATLAB设计与实现 电子信息科学与技术 指导教师 摘要：面对庞杂繁多的原始信号，如何提取所需要的信号，同时抑制不需要的信号？这需要使用滤波器。滤波器是一种选频系统，它对某些频率的信号予以很小的衰减，让这部分信号顺利通过，而对其他不需要的频率信号则予以很大的衰减，尽可能阻止这些信号通过。 数字滤波器因其具有精度高、可靠性好、灵活性大等优点，在工程上应用相当广泛。数字滤波器根据其冲击响应函数的时域特性又可以分为有限脉冲响应数字滤波器（FIR）和无限脉冲响应数字滤波器（IIR）。本文主要讨论用MATLAB软件实现IIR数字滤波器设计。 MATLAB语言是一种面向科学和工程计算的语言，它具有编程效率高，调试手段丰富，扩充能力强等特点，其应用设计众多领域。MATLAB语言的信号处理工具箱不仅可以用来进行IIR数字滤波器的设计，而且还可以使设计达到最优化，是设计数字滤波器的强有力工具。 关键词：数字滤波器；模拟滤波器；IIR；MATLAB Design and Realization of FIR Filter Based On MATLAB Science and Technology of Electronic Information Li Feng Tutor Sun Hongyan Abstract: Facing various confused the original signal, how to extract needed signal and simultaneously to suppress dont need signal？This need to use filter. Filter is a kind of frequency selective system. It for some frequency signal to small attenuation. Let this part signal passed smoothly. For other dont need as the frequency of the signal shall be great attenuation is. As far as possible to prevent these signals through.Because of its digital filter of high precision, good reliability and flexibility big advantages. In engineering application quite extensive. Digital filter of shock response function according to the time domain properties and can be divided into finite impulse response digital filter (FIR) and infinite impulse response digital filter (IIR). This paper mainly discusses the MATLAB software to realize IIR digital filter design. MATLAB language is a kind of facing the science and engineering calculation language. It has high efficiency, commissioning means programming rich, strong ability to wait for a characteristic, extended its application design many other fields. MATLAB language signal processing toolbox not only can be used for the design of IIR digital filter, and still can make a design to reach optimization. It is designed digital filter, powerful tools. Key words: Digital filter;Anolog filter;FIR; MATLA. 1 引言