Reference noise method of removing powerline noise from recorded signals

Research output: Contribution to journalArticle

Colleges, School and Institutes


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.


Original languageEnglish
Pages (from-to)110-114
Number of pages5
JournalJournal of Neuroscience Methods
Issue number1
Publication statusPublished - 30 Oct 2009


  • Adaptive noise cancelling, Signal processing, Mains noise, Notch, Electrophysiology