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 base-line wander.
journal_name
Med Biol Eng Computjournal_title
Medical & biological engineering & computingauthors
Sörnmo Ldoi
10.1007/BF02441986subject
Has Abstractpub_date
1993-09-01 00:00:00pages
503-8issue
5eissn
0140-0118issn
1741-0444journal_volume
31pub_type
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