摘要
目的解决心电信号分析中高采样频率下工频窄带陷波器设计难题。方法本文提出了一种基于零极点抵消和插值理论结合的带阻滤波器的设计方法,设计出滤波器系数为简单整系数,带宽可任意调整,而且可满足高采样率下工频陷波的要求。同时为了消除窄带滤波器的吉布思现象,本文吸取前人的经验,提出了在信号线性段采用平均滤波的方法消除吉布思现象。结果该方法设计的滤波器能有效去除高采样频率下50Hz工频干扰,且系数为整数,实现简单。结论基于零极点抵消和插值理论结合的带阻滤波器,可以有效地解决高采样率下窄带工频陷波器的设计难题,滤除了工频干扰信号,同时最大程度地保留了信号的有用成分,满足心电分析的要求。
Objective To meet the demand of ECG signal processing in high sampling rate, a simple and narrowband power-line interference notch filter is designed. Methods Based on the band elimination filter which was combined with counteraction of zeros and poles and the interpolation theory, we designed a simple, integral coefficient filter with adjustable filter bandwidth. To eliminate the Gibbs phenomena, we adopted the average filter in linear segments which was designed by the former. Results With our designed filter, 50 Hz power-line interference in high sampling rate was efficiently removed, and the filter coefficients were simple, integral, and convenient. Conclusion The new design can produce a narrowband notch filter in high sampling rate, remove the 50 Hz powerline interference effectively, and retain the significant signal as much as possible to meet the needs of ECG analysis.
出处
《航天医学与医学工程》
CAS
CSCD
北大核心
2008年第2期152-156,共5页
Space Medicine & Medical Engineering
关键词
心电图
整系数滤波器
工频陷波器
插值
平均滤波
ECG
integral coefficient filter
notch filter for power-line interference
interpolation
average filter
作者简介
兰瑞芬，女，硕士研究生，研究方向为运动心电信号的检测与处理
通讯作者：胡广书 hgs-dea@mail.tsinghua．edu.cn
