| 应用锁定放大原理去除脑电干扰 |
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| 引用本文： | 邵毅,童唐骥,展庆波,陈颖.应用锁定放大原理去除脑电干扰[J].南京师范大学学报,2009,9(3):75-78. |
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| 作者姓名： | 邵毅 童唐骥 展庆波 陈颖 |
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| 作者单位： | 南京大学生物医学电子学研究所,江苏,南京,210093 |
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| 摘 要： | 介绍了一种新型的去除工频干扰的方法.算法的主要思想源于硬件电路中的锁定放大器,它能精确地检验出信号中工频干扰的幅度、频率和相位并重构出干扰信号,将原始信号减去重构出的干扰信号即能得到正确的低噪信号.算法继承了锁定放大器出色的抗干扰能力.用一段采样频率为200 Hz的单导联脑电（EEG）数据测试算法,在其中添加了幅度、频率和相位在一定范围随机变化的噪声信号,最终得到的还原波形与原波形基本一样.还原波形与污染波形相比,信噪比提高了约30 dB,取得了令人满意的效果.
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| 关 键 词： | 锁定放大器 去噪 脑电 工频干扰 反馈 |
An Application of Lock-in Amplifier to Eliminate the Power Line Interference in EEG |
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| Shao Yi,Tong Tangji,Zhan Qingbo,Chen Ying.An Application of Lock-in Amplifier to Eliminate the Power Line Interference in EEG[J].Journal of Nanjing Nor Univ: Eng and Technol,2009,9(3):75-78. |
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| Authors: | Shao Yi Tong Tangji Zhan Qingbo Chen Ying |
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| Affiliation: | Institute of Biomedical Engineering;Nanjing University;Nanjing 210093;China |
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| Abstract: | This paper introduces a new type of power-line interference removal method,the main idea of the algorithm is derived from the lock-in amplifier in hardware circuit,which can accurately test the amplitude,frequency and phase of power-line interference in the signals,and gain the correct low-noise signal through subtracting the reconstructed interference signal from the original signal.This algorithm inherits the excellent anti-interference ability of lock-in amplifier.This algorithm has been tested in an exp... |
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| Keywords: | lock-in amplifier denoising EEG power-line frequency interference feedback |
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