去除移动心电中运动干扰的前馈组合自适应滤波器  

A Feed-Forward Combined Adaptive Filter for Suppressing Motion Artifact in Ambulatory Electrocardiogram

作　　者：张洹千[1,2] 张树林 杜晓薇[1] 金庆辉[1] 李擎[3] 杨坚 赵建龙 ZHANG Huan-qian;ZHANG Shu-lin;DU Xiao-wei;JIN Qing-hui;LI Qing;YANG Jian;ZHAO Jian-long(Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China;University of Chinese Academy of Sciences,Beijing 100049,China;Central Hospital of Xuhui District,Shanghai 200031,China)

机构地区：[1]中国科学院上海微系统与信息技术研究所,上海200050 [2]中国科学院大学,北京100049 [3]徐汇区中心医院,上海200031

出　　处：《华南理工大学学报（自然科学版）》2017年第12期65-70,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：上海市科委基金资助项目(14521106200)~~

摘　　要：最小均方自适应滤波器(LMS-AF)和变步长LMS-AF(VSS-LMS-AF)通常用来去除移动心电信号中的运动干扰.运动干扰和移动心电信号的非稳态特性会增加自适应滤波器的失调,组合自适应滤波器(C-AF)虽具有跟踪非稳态信号的能力,但仍存在信号失真.为了进一步减小信号失真,提高去除运动干扰的能力,提出了一种前馈组合自适应滤波器(FFC-AF),采用参考信号对运动干扰的稳态程度进行估计,将两个并行的自适应滤波器的输出组合起来.用10位健康志愿者的移动心电记录进行了仿真实验,以评估FFCAF的性能.结果表明,文中提出的FFC-AF比C-AF具有更小的信号失真和更大的信号干扰率,可以用于移动心电信号中运动干扰的去除.The least mean square adaptive filter(LMS-AF)and the variable step size LMS-AF(VSS-LMS-AF)have been widely used to suppress the motion artifact(MA)from ambulatory electrocardiograms(AECG).However,due to the fact that the non-stationary property of the MA and the AECG increases the mis-adjustment of filters,although the combined AF(C-AF)has advantages in tracking non-stationary signals,it still suffers from a signal distortion.In order to further decrease the signal distortion and improve the MA suppression ability,a new feed-forward combined AF(FFC-AF)is proposed,in which the stationary degree of the MA is estimated by using a reference signal and two parallel AF outputs are combined.Then,a simulation experiment with the AECG recording on ten healthy volunteers is conducted to assess the performance of the FFC-AF.The results show that,as compared with the C-AF,the FFC-AF is of less signal distortion and larger signal artifact ratio.Therefore,it can be used to suppress the MA in the AECG.

关 键 词：移动心电 运动干扰 自适应滤波器 信号失真 信号干扰率 

分 类 号：TH772[机械工程—仪器科学与技术]