频率采样设计带通滤波器 工学毕业论文.doc

频率采样设计带通滤波器 目录 第1章 概述 1.1数字滤波器数字滤波器与模拟滤波器工作方式、FIR滤波器的基本结构 1.2.2IIR滤波器的基本结构 1.3数字滤波器的研究背景与意义 1.4数字滤波器的应用现状与发展趋势 1.5本章小结 第2章 设计方案 2.1频率采样法设计带通滤波器 2.1.1设计内容 2.1.2设计原理 2.1.3设计的基本思想 2.2窗函数设计带通滤波器 2.2.1设计原理 2.2.2典型窗函数的介绍 2.2.3设计FIR滤波器的步骤 2.2.4设计结果及分析 第3章 设计实现 3.1程序代码 3.1.3语音程序： 3.1.2仿真结果： 3.2带通滤波器程序 3.2.1仿真结果： 3.3总程序 3.3.1仿真结果 第4章 小结 参考文献 附录 摘要 本文分析了国内外数字滤波技术的应用现状与发展趋势，介绍了数字滤波器的基本结构，在分别讨论了IIR与FIR数字滤波器的设计方法的基础上，指出了传统的数字滤波器设计过程复杂计算工作量大滤波特性调整困难Matlab和Modelsim软件的数字滤波器设计方法，完成了高Q值50Hz带通IIR滤波器的设计, 达到了通带45-55Hz，衰减小于3db，阻带40-60Hz，衰减大于80db的参数指标。文中深入分析了该滤波器系统设计的功能特点、实现原理以及技术关键，阐述了使用MATLAB进行设计的极大的减轻了工作量，有利于滤波器设计的最优化。IR；Matlab仿真; Abstract This paper analyzes the situation of application and development of digital filter technology home and abroad. It introduces the basic structure of a digital filter, discusses different design methods of FIR and IIR filter, and points out that the traditional design method of digital filter is not only complex but also of heavy workload, even adjustment of filtering parametrer is very difficult. So it brings forwad another design method of digital filter which based on the Matlab software and Modelsim software. This paper introduces the design method of a high Q value band-pass IIR filter which meets the given standard -- the pass band is 45-55Hz, with attenuation of less than 3db; the stop band is 40-60Hz with attenuation greater than 80db. It deeply analyzes the design features and principles of the filter system and the key technical in the design. Then it describs the use of Matlab in design and simulation of the bandpass filte design. In the end, the procedure was simulated on Modelsim. Simulation results of Modelsim and Matlab compared to make proof of the accuracy of the design. It is proved that the design can be accurate at the sixth decimal place, stable error is within one ten thousandth; The design has good portability and widely practical application. In different applications, according to different performance requirement