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动态心电信号中消除极化电压的数字滤波方法

Yu'e CHEN,Xiangyong KONG,Wenjie ZHU

Zhongguo yi liao qi xie za zhi = Chinese journal of medical instrumentation（2019）

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Abstract
在动态心电信号采集中,极化电压很容易使放大器饱和.传统的方法是采用高通滤波模拟电路来消除,但是输出往往会有残留.如果提升高通滤波截止频率,则会导致心电信号低频段失真.该文采用Savitzky-Golay(SG)平滑滤波器,结合单边点数M和多项式的阶次p拟合了动态心电信号中的极化电压成分,用原始信号减去拟合信号从而得到无极化电压的心电信号.实验表明,用SG平滑滤波器消除极化电压是可行的,滤波后的心电信号有效成分没有任何丢失.
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Key words
Savitzky-Golay smoothing filter,ambulatory ECG,digital filtering,polarization voltage
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