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Noise Cancellation in ECG Signals using Computationally

Author(s): D V Rama Koti Reddy | Mohammad Zia Ur Rahman | Rafi Ahamed Shaik

Journal: Signal Processing : An International Journal
ISSN 1985-2339

Volume: 3;
Issue: 5;
Start page: 120;
Date: 2009;
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Keywords: Adaptive Filtering | Artifact | ECG | LMS algorithm | Noise Cancellation

Several signed LMS based adaptive filters, which are computationally superior having multiplier free weight update loops are proposed for noise cancellation in the ECG signal. The adaptive filters essentially minimizes the mean-squared error between a primary input, which is the noisy ECG, and a reference input, which is either noise that is correlated in some way with the noise in the primary input or a signal that is correlated only with ECG in the primary input. Different filter structures are presented to eliminate the diverse forms of noise: 60Hz power line interference, baseline wander, muscle noise and the motion artifact. Finally, we have applied these algorithms on real ECG signals obtained from the MIT-BIH data base and compared its performance with the conventional LMS algorithm. The results show that the performance of the signed regressor LMS algorithm is superior than conventional LMS algorithm, the performance of signed LMS and sign-sign LMS based realizations are comparable to that of the LMS based filtering techniques in terms of signal to noise ratio and computational complexity.
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