数字滤波器的DSP实现

摘要

当前我们正处于数字化时代，数字信号处理技术受到了人们的广泛关注，其理论及算法随着计算机技术和微电子技术的发展得到了飞速的发展，被广泛应用于语音图象处理、数字通信、谱分析、模式识别、自动控制等领域。数字滤波器是数字信号处理中最重要的组成部分之一，几乎出现在所有的数字信号处理系统中。数字滤波器是指完成信号滤波处理的功能，用有限精度算法实现的离散时间线性非时变系统，其输入是一组(由模拟信号取样和量化的)数字量，其输出是经过变换的另一组数字量。相对于模拟滤波器，数字滤波器没有漂移，能够处理低频信号，频率响应特性可做成非常接近于理想的特性，且精度可以达到很高，容易集成等，这些优势决定了数字滤波器的应用越来越广泛。同时DSP(数字信号处理器)的出现和FPGA的迅速发展也促进了数字滤波器的发展，并为数字滤波器的硬件实现提供了更多的选择。

本论文的主要研究了数字滤波器的基本理论及其算法。基于TI公司的数字信号处理器TMS320VC5509设计了一款稳定度高，低功耗的数字滤波器系统，并完成了软硬调试工作。主要工作如下：

(1)研究了数字滤波器的基本理论，以及数字滤波器的实现方法。通过学习识字滤波器

的结构、数字滤波器的设计理论，掌握了各种数字滤波器的原理和特性。为实现数字滤波器奠定了理论基础。

(2)研究分析了如何利用MATLAB仿真软件来设计出符合各种要求的数字滤波器。并采用

了相关的函数设计了几款常用的数字滤波器，并得到了滤波器的相关系数，为利用DSP实现数字滤波做好了一些前期的工作。

(3)根据TI公司5000系列数字信号处理器的基本结构和特征，充分利用其片上资源t结

合MATLAB软件的仿真，用软件实现高性能稳定的数字滤波器。

关键字：数字滤波器，DSP，IIR(无限长单位脉冲响应)，FIR(有限长单位脉冲响应)

Abstract

Nowadays we are in the digital time，the technology of digital signal process are got extensive attention by people.．Accompany with the development of technology of computer and microelectronics．the theory and arithmetic of digital signal processdevelopment quickly，Digital filters are extemsively used in audio and video process，digital communications，frequency analyse，autocontrol and so on．Digital filter is one of the most important part of digital signal process，almost appeared in all digital signal process system．Digital filter is a discrete LIT system can accomplish the signal filter using finite precision arithmetic，with a group of digital signal input(which sampled and measure with analog signals)and another group of changed digital signal output．Digital filter is one of the important contents of digital signal process． Relative to analog filter,the digital filter without excursion，be able to process low frequency signal，the characteristic of frequency response close to ideal value，with high precision．and easy to integrated．These advantages de,de the application of digital filter become more and more extensively．While the developing of DSP (digital signal processor)and FPGA,provide more choice for digital filter．The mostly important task of this paper is researching the basic theories of digital filter,base on the TMS320VC5509 of TI company design digital filter system with high stability and low power consume，accomplish the hardware and software debug．main task as following：

(1)Reach the basic theory of digital filter and the method of realize of digital

filter,grasp the principle and characteristic of each digital filter．(2)Reach and analyse how to use the simulate software of MATLAB to design the

required digital filter．Use several function design some universal digital filter,get the coefficient of digital filter,prepare the prophase task of design a digital filter base onDSP．

(3)According to the basic structure and characteristic of spectrum 5000 digital

signal processor of TI，make the best of of the resource On chip，combined with simulate software MATLAB，realized a high performance and high stability digital filter

Key Words：Digital filter,DSP(Digital Signals Processor)，IIR(Infinity Impulse Response)，FIR(Finity Impulse Respons)///