Power-line Interference Elimination from ECG Signals Using Notch Filtration: A Quasi-real Time Version
Different types of notch filtration have been developed and used for power-line-interference (PLI) suppression in acquired and preprocessed ECG signals; most of them originate from the distant past. Generally, the traditional notch filters (NF) affect ECG frequency components around the rated PLI fr...
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Bulgarian Academy of Sciences
2024-09-01
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| Series: | International Journal Bioautomation |
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| Online Access: | http://www.biomed.bas.bg/bioautomation/2024/vol_28.3/files/28.3_04.pdf |
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| author | Todor Stoyanov Ivan Dotsinsky Georgy Mihov |
| author_facet | Todor Stoyanov Ivan Dotsinsky Georgy Mihov |
| author_sort | Todor Stoyanov |
| collection | DOAJ |
| description | Different types of notch filtration have been developed and used for power-line-interference (PLI) suppression in acquired and preprocessed ECG signals; most of them originate from the distant past. Generally, the traditional notch filters (NF) affect ECG frequency components around the rated PLI frequency. Recently Dotsinsky [1] published a successful off-line notch filtration providing almost total PLI elimination. Recordings taken from the AHA database are mixed by synthesized interference with frequency, which varies from 49 to 51 Hz within 20 s. They are subjected in a MATLAB environment to bidirectional band pass (BP) filtration with central frequency f0 = 50 Hz. Thus, the phase shift is compensated and the zero crossings of the extracted sinusoidal BP waves are identical to that of the PLI. In this study, the standard bi-directional BP is replaced with such one working in a quasi-real time thus allowing immediate tracking and interpretation of the ECG signals. A third 150 Hz PLI harmonic is also added as part of the disturbance to bring us closer to real ECG acquisition conditions. Further on, the variable sine wavelengths are measured between two consecutive zero crossings defined as the first positive BP sample following a series of negative ones. The inter-sample distances are equated to unity. The left and right lateral distances are calculated using similar triangles and aided to the inter-sample distances. The obtained fractal wave periods are converted into corresponding variable PL frequencies fi. Corrupted signals are then subjected to bidirectional notch filtration (NF) with a narrow stop-band using fi as a continuously updated central frequency. The carried out experiments show error of about 2 microV between the original and processed ECG signals with sampling rate Q = 5 kHz. |
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| id | doaj-art-99a1ec904bd547feb2a3675afb584935 |
| institution | Kabale University |
| issn | 1314-1902 1314-2321 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | Bulgarian Academy of Sciences |
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| series | International Journal Bioautomation |
| spelling | doaj-art-99a1ec904bd547feb2a3675afb5849352025-01-10T12:57:08ZengBulgarian Academy of SciencesInternational Journal Bioautomation1314-19021314-23212024-09-0128316117010.7546/ijba.2024.28.3.001003Power-line Interference Elimination from ECG Signals Using Notch Filtration: A Quasi-real Time VersionTodor Stoyanov0Ivan DotsinskyGeorgy MihovInstitute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str. Bl. 105, Sofia 1113 BulgariaDifferent types of notch filtration have been developed and used for power-line-interference (PLI) suppression in acquired and preprocessed ECG signals; most of them originate from the distant past. Generally, the traditional notch filters (NF) affect ECG frequency components around the rated PLI frequency. Recently Dotsinsky [1] published a successful off-line notch filtration providing almost total PLI elimination. Recordings taken from the AHA database are mixed by synthesized interference with frequency, which varies from 49 to 51 Hz within 20 s. They are subjected in a MATLAB environment to bidirectional band pass (BP) filtration with central frequency f0 = 50 Hz. Thus, the phase shift is compensated and the zero crossings of the extracted sinusoidal BP waves are identical to that of the PLI. In this study, the standard bi-directional BP is replaced with such one working in a quasi-real time thus allowing immediate tracking and interpretation of the ECG signals. A third 150 Hz PLI harmonic is also added as part of the disturbance to bring us closer to real ECG acquisition conditions. Further on, the variable sine wavelengths are measured between two consecutive zero crossings defined as the first positive BP sample following a series of negative ones. The inter-sample distances are equated to unity. The left and right lateral distances are calculated using similar triangles and aided to the inter-sample distances. The obtained fractal wave periods are converted into corresponding variable PL frequencies fi. Corrupted signals are then subjected to bidirectional notch filtration (NF) with a narrow stop-band using fi as a continuously updated central frequency. The carried out experiments show error of about 2 microV between the original and processed ECG signals with sampling rate Q = 5 kHz.http://www.biomed.bas.bg/bioautomation/2024/vol_28.3/files/28.3_04.pdfecg signalspower line interference suppressionbidirectional band pass filtrationnarrow notch filtrationfirst and third harmonics |
| spellingShingle | Todor Stoyanov Ivan Dotsinsky Georgy Mihov Power-line Interference Elimination from ECG Signals Using Notch Filtration: A Quasi-real Time Version International Journal Bioautomation ecg signals power line interference suppression bidirectional band pass filtration narrow notch filtration first and third harmonics |
| title | Power-line Interference Elimination from ECG Signals Using Notch Filtration: A Quasi-real Time Version |
| title_full | Power-line Interference Elimination from ECG Signals Using Notch Filtration: A Quasi-real Time Version |
| title_fullStr | Power-line Interference Elimination from ECG Signals Using Notch Filtration: A Quasi-real Time Version |
| title_full_unstemmed | Power-line Interference Elimination from ECG Signals Using Notch Filtration: A Quasi-real Time Version |
| title_short | Power-line Interference Elimination from ECG Signals Using Notch Filtration: A Quasi-real Time Version |
| title_sort | power line interference elimination from ecg signals using notch filtration a quasi real time version |
| topic | ecg signals power line interference suppression bidirectional band pass filtration narrow notch filtration first and third harmonics |
| url | http://www.biomed.bas.bg/bioautomation/2024/vol_28.3/files/28.3_04.pdf |
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