基于正弦参数估计的工频干扰消除算法  

Arithmetic for Subtracting Power Line Interference Based on Estimating Sinusoidal Parameters

作　　者：胡晓[1] 魏薇[2] 刘长红[1] 韩孝明[1] 

机构地区：[1]广州大学机械与电气工程学院,广州510006 [2]广东省人民医院,广州510080

出　　处：《生物医学工程学杂志》2010年第6期1243-1246,共4页Journal of Biomedical Engineering

基　　金：广东省科技计划资助项目(2009B060700124);广东省教育部产学研资助项目(2009B090600034);广州市科技计划资助项目(10C32010808)

摘　　要：混入心电(ECG)信号中的工频干扰会影响对ECG信号的自动分析。为了不造成ECG信号的变形,数字陷波器需要很窄的陷波带。但是,窄带宽陷波器又不利于消除频率偏移后的工频干扰(PLI)。为此,本文提出一种基于正弦参数估计的新算法。首先,通过线性段中的正弦值估计工频正弦信号的频率和相位;第二,由估计的正弦参数确定正弦函数;第三,根据最近邻原则,通过此函数计算靠近该线性段的非线性段中的PLI值。最后,将实际值减去相应的PLI值。实验证明:与其它算法相比,该算法能够更为有效地抑制非平稳正弦干扰。Electrocardiogram（ECG） signals are often contaminated by residual power-line interference.In order to filter the noise and not to distort signal too much,certain types of digital notch filters need a narrow frequency band,but such a band leads to ineffective filtering in the case of frequency deviation of the interference.In this paper,we propose a novel arithmetic.Firstly,sinusoidal parameters（frequency and phase） are estimated from the sinusoidal values in the linear segment of ECG.Secondly,a sinusoid function in linear segment is determined by the estimated sinusoidal parameters.Thirdly,the interference values in the nonlinear segment closest to the linear segment are calculated by the sinusoid function.Lastly,we subtract the corresponding interference value from the real value.The experiment results show that,in comparison with other arithmetic,the novel arithmetic can more effectively remove the power-line interference from ECG signal.

关 键 词：工频干扰 心电信号 正弦参数估计 线性段 

分 类 号：TN911.23[电子电信—通信与信息系统]