IIR数字滤波器的系数量化效应分析  

Analysis of IIR digital filter's coefficient quantizations effect

作　　者：姜乃卓[1] 都思丹[1] 

机构地区：[1]南京大学电子科学与工程系,南京210093

出　　处：《电子测量技术》2010年第12期8-11,共4页Electronic Measurement Technology

摘　　要：主要讨论了在定点DSP处理器上实现数字滤波器。分析了数字滤波器系数量化的影响,对滤波器的不同实现结构进行了MATLAB仿真分析和实际DSP滤波效果比较。研究结果表明,在滤波器系数以同样的精度量化条件下,用级联Ⅱ型结构实现的IIR数字滤波器其滤波效果要明显优于用直接Ⅱ型结构实现的IIR数字滤波器。前者不仅有更好的幅频响应精度而且还能有效防止运算结果溢出,保持滤波器的稳定。The realization of digital filter in fixed point DSP is mainly discussed in this article.The coefficient quantizations effect of digital filter is analyzed,the simulation analysis with matlab and the practical filter effect in DSP is compared according to the different implementation struction of digital filter.The research results shows that cascade implementation of IIR digital filter is obviously better than direct implementation of it in the condition that the coefficient of IIR digital filter is quantized in the same accuracy when filtering.The former not only has a better amplitude frequency response accuracy,but also can effectively prevent the overflow of calculation results and keep the filter stable.

关 键 词：系数量化 IIR数字滤波器 信噪比 DSP 

分 类 号：TP911.72[自动化与计算机技术]