Hu Xiao, Wei Wei, Liu Changhong, Han Xiaoming
School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou 510006, China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2010 Dec;27(6):1243-6.
Electrocardiogram (ECG) signals are often contaminated by residual power-line interference. In order to filter the noise and not to distort signal too much, certain types of digital notch filters need a narrow frequency band, but such a band leads to ineffective filtering in the case of frequency deviation of the interference. In this paper, we propose a novel arithmetic. Firstly, sinusoidal parameters (frequency and phase) are estimated from the sinusoidal values in the linear segment of ECG. Secondly, a sinusoid function in linear segment is determined by the estimated sinusoidal parameters. Thirdly, the interference values in the nonlinear segment closest to the linear segment are calculated by the sinusoid function. Lastly, we subtract the corresponding interference value from the real value. The experiment results show that, in comparison with other arithmetic, the novel arithmetic can more effectively remove the power-line interference from ECG signal.
心电图（ECG）信号常常受到残留电力线干扰的污染。为了过滤噪声且不过度扭曲信号，某些类型的数字陷波滤波器需要窄频带，但在干扰频率偏移的情况下，这样的频带会导致滤波无效。在本文中，我们提出了一种新颖的算法。首先，从心电图线性段中的正弦值估计正弦参数（频率和相位）。其次，由估计出的正弦参数确定线性段中的正弦函数。第三，通过该正弦函数计算最接近线性段的非线性段中的干扰值。最后，从真实值中减去相应的干扰值。实验结果表明，与其他算法相比，该新颖算法能够更有效地去除心电图信号中的电力线干扰。
