Time-varying digital filtering of ECG baseline wander
- 1 September 1993
- journal article
- Published by Springer Nature in Medical & Biological Engineering & Computing
- Vol. 31 (5) , 503-508
- https://doi.org/10.1007/bf02441986
Abstract
Time-varying filtering techniques are applied to the problem of baseline correction by letting the cut-off frequency of a linear filter be controlled by the low-frequency properties of the ECG signal. The time-varying filter is implemented as a bank of linear low-pass filters, in which each filter has a slightly differing cut-off frequency. Sampling rate decimation and interpolation are employed because the design of a filter for baseline reduction can be treated as a narrowband filtering problem. All filters have a linear phase response to reduce, for example, ST-segment distortion. The performance of the technique presented is studied on ECG signals with different types of simulated baseline wander. The results are compared with the performance of time-invariant linear filtering and cubic spline interpolation. The results show that an improvement in performance can be achieved when using time-varying filtering, especially at low heart rates or during episodes with excessive baseline wander.Keywords
This publication has 11 references indexed in Scilit:
- Recommendations for standardization and specifications in automated electrocardiography: bandwidth and digital signal processing. A report for health professionals by an ad hoc writing group of the Committee on Electrocardiography and Cardiac Electrophysiology of the Council on Clinical Cardiology, American Heart Association.Circulation, 1990
- A simple approach to the design of linear phase fir digital filters with variable characteristicsSignal Processing, 1988
- Problems and limitations of ECG baseline estimation and removal using a cubic spline technique during exercise ECG testing: Recommendations for proper implementationJournal of Electrocardiology, 1988
- ECG baseline wander reduction using linear phase filtersComputers and Biomedical Research, 1986
- Removal of Base-Line Wander and Power-Line Interference from the ECG by an Efficient FIR Filter with a Reduced Number of TapsIEEE Transactions on Biomedical Engineering, 1985
- Delineation of the QRS complex using the envelope of the e.c.g.Medical & Biological Engineering & Computing, 1983
- Digital filtering and regression algorithms for an accurate detection of the baseline in ECG signalsMedical Informatics, 1983
- Digital FIR Filtering For Removal of ECG Baseline WanderJournal of Clinical Engineering, 1982
- Electrocardiogram baseline noise estimation and removal using cubic splines and state-space computation techniquesComputers and Biomedical Research, 1977
- Filtering without Phase ShiftIEEE Transactions on Biomedical Engineering, 1975