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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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应用锁定放大原理去除脑电干扰
, PP. 75-78
Keywords: 锁定放大器,去噪,脑电,工频干扰,反馈
Abstract:
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200Hz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30dB,取得了令人满意的效果.
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