摘要
在心电地图仪中记录到的体表心电信号往往由于电磁的影响而引进工频干扰．基于体表心电信号中工频干扰的特点，作者提出了一种滤除工频干扰的方法，即就单独—胸导联信号通过提高频谱的分辨率来估计工频干扰的频率；基于最小均方误差准则来估计各导联信号中工频干扰的幅度和相位。文中还给出了该算法的流程图和滤波性能分析。模拟结果表明了该算法的有效性。应用该算法对心电地图仪中的工频干扰进行对消，取得了满意的结果。
igital recordings of ECG signals are generally corrupted by alternative current(AC) interference around 50Hz. This paper offers a method to cancel AC noises by estimating the frequency, amplitude and phase of AC noise in Body Surface Potential Mapping (BSPM).The AC frequency is estimated by applying a high resolution method to approximate the true AC frequency in one channel signal of BSPM. The AC amplitude and phase are estimated based on the Least Mean Square Error Estimation. Block diagram and performance measures of the algorithm are presented. Experimental results show that this algorithm works well.
出处
《数据采集与处理》
CSCD
1994年第3期183-190,共8页
Journal of Data Acquisition and Processing
基金
国家自然科学基金
关键词
心电信号
心电地图仪
工频干扰
滤除
frequency spectrum analysis
electromagnetic interference
algorithms
least mean square error estimation
body surface potential mapping
