摘要
提出一种基于窗函数法设计FIR数字滤波器的优化算法。与传统的通过调整窗函数或滤波器阶数来改善设计指标的方法相比,该算法在迭代运算中利用已知的误差信息通过窗函数法不断对设计结果进行修正,从而在滤波器阶数不变的情况下使所设计滤波器的频率响应逐渐逼近理想频率响应。由于算法中的逼近误差可灵活定义,它能够适用于具有不同频域技术指标要求的非选频型FIR数字滤波器的优化设计。设计结果表明该算法具有明显的优化效果。
A novel iterative algorithm for optimization design of non-frequency-selective FIR digital filters is proposed based on the windowing method.Compared with the traditional optimization concept of modifying the window functions or the orders of digital filters,the algorithm minimizes the approximation error by successively modifying the design results by iterative operations with the windowing method.Because the approximation error can be variably defined,the algorithm is applicable for the design of FIR digital filters with different technical requirements in the frequency domain.A design example is used to illustrate the efficiency of the algorithm.
出处
《数据采集与处理》
CSCD
北大核心
2008年第2期228-232,共5页
Journal of Data Acquisition and Processing
基金
国家“八六三”高技术研究发展计划(863-307-7-5)资助项目
国防科技基金(2005JS63.3.1.KG0111)资助项目
关键词
FIR数字滤波器
窗函数法
频率响应
逼近误差
FIR digital filters
windowing method
frequency response
approximation error
