【摘要】 数字滤波器在数字信号处理中发挥着十分重要的作用,它是通过对抽样数据进行数学运算处理来达到频域滤波的目的。本文叙述了IIR(无限冲击响应)数字滤波器的算法结构,并给出了直接Ⅱ型滤波器结构图;然后利用MATLAB的信号处理工具箱中的图形GUI设计工具设计3阶巴特沃思低通数字滤波器,并给出了用TMS320LF2407A DSP实现数字滤波器的完整程序;最后通过仿真数据进行验证、分析和比较。从滤波前后的波形图可以得到如下结论,本文设计的巴特沃思数字滤波器完全达到了设计要求,具有较强的实用性,保证了系统所采集数据的精确度。更多还原

【Abstract】 The digital filter plays an important role in digital signal processing,which uses mathematics operation on the sampled data to reach the goal of frequency domain filtering.This article indicates the algorithm structure of IIR digital filter and the diagram of directⅡtype filter is given.Then the signal processing toolbox of MATLAB is used to design 3-order Butterworth low-pass digital filter,and the entire program of the digital filter that is realized on TMS320LF2407A DSP is showed.The verification,analysis and comparison are carried on the simulation data,and from the wave diagrams it can be concluded that the Butterworth digital filter which this paper designs meets the requirements,has good practicability and assures the accuracy of sampled data.更多还原