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Use of finite wordlength FIR digital filter structures with improved magnitude and phase characteristics for reduction of muscle noise in EEG signals

Sadasivan, PK and Dutt, Narayana D (1995) Use of finite wordlength FIR digital filter structures with improved magnitude and phase characteristics for reduction of muscle noise in EEG signals. In: Medical, & Biological Engineering & Computing, 33 (3). 306-312 .

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Abstract

One of the main disturbances in EEG signals is EMG artefacts generated by muscle movements. In the paper, the use of a linear phase FIR digital low-pass filter with finite wordlength precision coefficients is proposed, designed using the compensation procedure, to minimise EMG artefacts in contaminated EEG signals. To make the filtering more effective, different structures are used, i.e. cascading, twicing and sharpening (apart from simple low-pass filtering) of the designed FIR filter Modifications are proposed to twicing and sharpening structures to regain the linear phase characteristics that are lost in conventional twicing and sharpening operations. The efficacy of all these transformed filters in minimising EMG artefacts is studied, using SNR improvements as a performance measure for simulated signals. Time plots of the signals are also compared. Studies show that the modified sharpening structure is superior in performance to all other proposed methods. These algorithms have also been applied to real or recorded EMG-contaminated EEG signal. Comparison of time plots, and also the output SNR, show that the proposed modified sharpened structure works better in minimising EMG artefacts compared with other methods considered.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Springer.
Keywords: EEG;EMG artefact;FIR filters;Filter structures;Modified sharpening;Phase characteristics
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 02 Jun 2011 06:52
Last Modified: 02 Jun 2011 06:52
URI: http://eprints.iisc.ernet.in/id/eprint/38139

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