Neuroscience, School of Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, United Kingdom.
J Neurosci Methods. 2009 Oct 30;184(1):110-4. doi: 10.1016/j.jneumeth.2009.07.003. Epub 2009 Jul 10.
Powerline contamination of recorded signals represents a major source of noise in electrophysiology and impairs the use of recordings for research. In this article we present simple and effective method for cancelling 50 Hz (or 60 Hz) noise using a reference noise signal and average noise cycle subtraction. This method is capable of reliably removing not only the fundamental powerline frequency but also its harmonic frequencies. The efficiency of this method appears to be superior to other commonly used methods such as notch filtering or adaptive filtering. Our experience and results show that this method can be efficiently used with very low signal-to-noise ratios, while preserving original signal waveform.
记录信号的电源线干扰是电生理学中主要的噪声源，并会降低记录在研究中的使用价值。在本文中，我们提出了一种使用参考噪声信号和平均噪声周期相减的简单有效的方法来消除 50 Hz（或 60 Hz）噪声。该方法不仅能够可靠地去除基本的电源线频率，还能去除其谐波频率。该方法的效率似乎优于其他常用方法，如陷波滤波或自适应滤波。我们的经验和结果表明，该方法可以在非常低的信噪比下有效地使用，同时保持原始信号波形。
