一种抑制50Hz工频干扰的方法——基于FTF算法的自适应滤波  

A Method for Rejecting 50Hz interference── Adaptive Filtering Based on FTF Algorithm

作　　者：胡振山[1] 曾海坚[1] 王华卿 曾祥森[1] 林家瑞[1] 

机构地区：[1]华中理工大学生物工程系

出　　处：《生物医学工程学杂志》1996年第4期341-344,共4页Journal of Biomedical Engineering

摘　　要：在长时间动态心电记录（ＨＯＬＴＥＲ）系统中．５０Ｈｚ工频干扰会影响ＥＣＧ信号的质量和可诊断性，从而对ＱＲＳ复波的自动识别及节律分析产生不良影响。因此消除５０Ｈｚ工频干扰在ＥＣＧ信号予处理中占有重要地位。５０Ｈｚ工频干扰的频率和幅度是随着电网参数的波动而变化的。从本质上讲，５０Ｈｚ工频干扰的波动过程是一种非平稳随机过程。采用固定的窄带陷波器对５０Ｈｚ工频干扰进行去除，不可能完全抑制５０Ｈｚ工频干扰。本文提出了一种基于ＦＴＦ（快速横向自适应滤波型）的自适应方法对５０Ｈｚ干扰进行跟踪、拟合．有效地抑制了５０Ｈｚ干扰；最后给出了自适应滤波结果，并对此方法做了进一步讨论。50Hi interference is harmful to automatic detection of oRS complexes and the classification of arrhythmia in HOLTER system recording. Therefore, it is essential to react 50Hi interference in the preprocess ofECG signal. Frequency and amplitude of 50Hi interference vary with the variation of the parameters of power network. Fixed property of analog or digital filtering is difficult to trace 50Hi noise. An Adaptive Filtering Method ispresented to trace 50Hi interference in ECG signal so as to eliminate it. Fast Transverse Adaptive Filtering(FTF) algorithm is employed to improve convergence and reduce time of calculation. The result is given as well asfurther discussion.

关 键 词：非平稳 自适应滤波 FTF 生物医学信号 采集 

分 类 号：R318.04[医药卫生—生物医学工程]