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Time-varying digital filtering of ECG baseline wander
1Department of Clinical Physiology, Lund University, Sweden.
Medical & Biological Engineering & Computing
|September 1, 1993
Summary
This study introduces time-varying filtering for electrocardiogram (ECG) baseline correction, improving signal quality. The novel method enhances ECG analysis, particularly during low heart rates or significant baseline wander.
Area of Science:
- Biomedical Engineering
- Signal Processing
Background:
- Baseline wander in electrocardiogram (ECG) signals can distort diagnostic information.
- Existing methods like time-invariant filtering and cubic spline interpolation have limitations in correcting complex baseline drift.
Purpose of the Study:
- To develop and evaluate a time-varying filtering technique for robust ECG baseline correction.
- To minimize ST-segment distortion using linear phase filters.
Main Methods:
- Implemented a time-varying filter bank with adjustable cut-off frequencies based on ECG signal properties.
- Utilized sampling rate decimation and interpolation for narrowband filtering.
- Ensured linear phase response in all filters.
Main Results:
- The time-varying filtering technique demonstrated improved performance in ECG baseline correction.
- Significant enhancements were observed with simulated baseline wander, especially at low heart rates.
Conclusions:
- Time-varying filtering offers a superior approach to ECG baseline correction compared to traditional methods.
- This technique is particularly beneficial for ECGs with dynamic baseline variations and slow heart rates.