Denoising and Features Extraction of ECG Signals in State Space Using Unbiased FIR Smoothing

The electrocardiogram (ECG) signals bear fundamental information for making decisions about different kinds of heart diseases. Therefore, many efforts were made during decades to extract features of heartbeats via ECG records with high accuracy and efficiency using different strategies and methods....

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Bibliographic Details
Published in:IEEE access 2019, Vol.7, p.152166-152178
Main Authors: Lastre-Dominguez, Carlos, Shmaliy, Yuriy S., Ibarra-Manzano, Oscar, Vazquez-Olguin, Miguel
Format: Article
Language:English
Subjects:
Arrhythmia
Biomedical signal processing
ECG features extraction
electrocardiogram (ECG) signal denoising
Electrocardiography
Electromagnetic wave filters
Feature extraction
Fibrillation
Heart beat
Heart diseases
Histograms
Impulse response
Noise reduction
Rhythm
Smoothing methods
Statistical analysis
unbiased finite impulse response (UFIR) filtering
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Summary:The electrocardiogram (ECG) signals bear fundamental information for making decisions about different kinds of heart diseases. Therefore, many efforts were made during decades to extract features of heartbeats via ECG records with high accuracy and efficiency using different strategies and methods. In this paper, we solve the problem in discrete-time state-space using a novel q-lag unbiased finite impulse response (UFIR) smoother, which we adapt to the ECG signal shape via the time-varying optimal averaging horizon. It is shown that the adaptive UFIR smoother performs better in applications to ECG signals than the standard techniques such as the Savitsky-Golay, wavelet-based, low-pass, band-pass, notch, and median filters. Applications are given for the PhysioBank data benchmark, which contains several records taken from different databases such as the MIT-BIH Arrhythmia (MITDB). A complete statistical analysis is provided via normalized histograms and statistical classifiers. It is shown in a comparison with other methods that the adaptive UFIR smoother has a higher accuracy in denoising, features extraction, and features classification for ECG records with normal rhythm and atrial fibrillation (AF).
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2948067