数字滤波在心磁噪声抑制中的应用  

THE APPLICATION OF DIGITAL FILTER IN MAGNETOCARDIOGRAPHY (MCG) NOISE SUPPRESSION

作　　者：孔祥燕[1] 王会武[1] 朱学敏[1] 田野[1] 任育峰[1] 于洪伟[1] 陈赓华[1] 张利华[1] 杨乾声[1] 

机构地区：[1]中国科学院物理研究所,北京100080

出　　处：《低温物理学报》2005年第2期170-173,共4页Low Temperature Physical Letters

基　　金：中国科学院 (课题编号 :KJCX2 W4 );国家科学技术部 (课题编号 .2 0 0 2AA30 6 4 12 )资助项目 .

摘　　要：提出了一种基于数据重置最小均方算法的自适应数字滤波器,并将其应用于抑制心磁信号的背景噪声.数值模拟结果表明该滤波器对于相关噪声,尤其是有幅值变化和时间延迟的情况,有很强的抑制效果.该滤波器有很宽的带宽.利用它可以使心磁信号的信噪比提高到器件的本征噪声水平.利用周期平均的方法进一步提高信噪比,对滤波前后心磁信号的频谱进行了分析.An adaptive filter based on Data-Reusing Least-Mean-Square algorithm has been proposed and applied in magnetocardiography (MCG) to suppress ambient noise. Numerical simulation studies indicate that the adaptive filter is a powerful noise suppresser for correlated interferences, especially for those with amplitude changing and time delay. Also the filter has a wide frequency bandwidth. With this filter, the signal-to-noise ratio of a MCG is improved to the intrinsic noise level. Further improvement of signal-to-noise ratio has been made by the periodic average method. The frequency spectrum of the signals is also analyzed and discussed.

关 键 词：噪声抑制 应用 自适应数字滤波器 最小均方算法 磁信号 相关噪声 模拟结果 背景噪声 时间延迟 高信噪比 噪声水平 抑制效果 本征 器件 频谱 

分 类 号：TN713[电子电信—电路与系统]