基于DSP的FIR数字滤波器的设计与实现素材.doc

基于DSP的FIR数字滤波器的设计与实现  摘 要 数字滤波器是数字信号处理中最重要的组成部分之一，数字滤波器由数字乘法器、加法器和延时单元组成的一种算法或装置ealization of FIR digital filter Based on DSP Abstract A digital filter, which is one of the most important parts of digital signal processing, is an algorithm or a device made of digital on time-multiplier, adder and delay of elements. It can be used to be the pretreatment of signal by application program. The FIR digital filter Based on DSP has many features ,such as uninfluenced ,high accuracy ,good stability and highly flexible .The digital filter is widely used in fields of speech image processing, digital communication, spectrum analysis, pattern recognition and automatic control, etc. It will has broad space for development. This paper firstly introduces the concept of digital filter ,classification, and the realization method of digital filter. On the basis of understanding FIR filters working principle and design method , we use rectangular window to realize the design of FIR low-pass filters under the MATLAB environment. Then ,making the design of FIR digital low-pass filters come true through programming by combination of the DSP and CCS2.0. The simulation results show that the filter based on DSP realizing have good stability, high precision, flexibility,etc, and can also realize real-time filtering. Key words FIR digital filter；DSP；Window method；MATLAB；TMS320C5402 目 录 1 引言 1 1.1 数字滤波器的概念 1 1.2 数字滤波器的分类 1 1.3 数字的滤波器的发展及其优越性 2 1.4 数字滤波器的实现方法 2 2 FIR数字滤波器的设计原理及MATLAB的实现 4 2.1 FIR数字滤波器的基本网络结构 4 2.2 FIR数字滤波器的设计方法 4 2.3 FIR数字滤波器的MATLAB的实现 7 3 基于DSP的FIR数字滤波器的设计与实现 9 3.1 DSP芯片的概述 9 3.2 FIR数字滤波器的DSP实现 11 结 论 15 参考文献 16 1 引言 随着信息时代的到来，数字信号处理已成为当今一门极其重要的学科和技术领域。数字信号在通信、语音、图像、自动控制、雷达、航空航天、医疗和家用电器等众多领域得到了广泛的应用。在数字信号处理中数字滤波占有极其重要的地位，与模拟滤波相比，数字滤波具有很多突出优点，比如精确度高、稳定、灵活、不要求阻抗匹配、容易实现线性相位、还可以避免模拟滤波器无法克服的电压漂移、温度漂移和噪声偏移等问题。 1.1 数字滤波器的概念 所谓数字滤波器[1]，是指输入、输出均为数字信号，通过数值运算关系改变输入信号所含频率成分的相对比例,或者滤除某些频率成分的器件。若其系统函数为h