用IIR格型陷波器消除信号中低频干扰的研究  

The Study of Removing Low Frequency Interference from Signal by IIR Lattice Notch Filter

作　　者：张世平[1] 赵永平[1] 沈国锋 张绍卿[1] 

机构地区：[1]哈尔滨工业大学自动化测试与控制系,哈尔滨150001

出　　处：《仪器仪表学报》2003年第z1期508-511,共4页Chinese Journal of Scientific Instrument

摘　　要：为了有效地消除信号中的低频干扰 ,本文研究了 IIR格型陷波滤波器的系数敏感度问题。在分析了三种格型滤波器的结构和敏感度的基础上 ,认为基于全滤波器的 IIR陷波器在低频段具有最低的系数敏感度。通过一个设计实例说明了这种纯格型结构由于量化效应引起的频率偏移量要远远小于级联式格型结构。最后通过在电力线通信中的实际应用验证了该滤波器的性能。To remove low frequency interference effectively from signal by lattice IIR notch filter,the problem of sensitivity to coefficient is investigated.Three kinds of structures and sensitivity of lattice IIR notch filters being compared,it is obtained that the approach based on all pass filter has the least sensitivity at low frequency.A design example indicates that notch frequency shift of pure lattice structure after coefficient quantization is much less than that of cascade lattice structure.Moreover,an actual application in power line communication is presented to demonstrate the performance of this notch filter.

关 键 词：陷波器 全通滤波器 系数敏感度 低频干扰 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]