Method and apparatus for removing baseline wander from an ECG si

Details Method and apparatus for removing baseline wander from an ECG si Method and apparatus for removing baseline wander from an ECG si

1992-03-17

1994-06-07

Cohen, Lee S.

Surgery

Truss

Pad

128901, A61B 50428

Patent

active

053180364

ABSTRACT:
A method and apparatus for removing baseline wander in which an ECG waveform is continuously sampled at 500 samples per second. The digitized data is continuously filtered by an infinite-impulse response (IIR) filter implemented on a first microprocessor. The data is stored in a buffer from which it is read in reverse chronological order in overlapping 3 second blocks. Each block is applied to the input of a second IIR filter which is implemented on a second microprocessor with substantially the same code as the first IIR filter. The first 1.5 seconds of each reverse-filtered block is disregarded to permit the output of the filter to settle. The retained data is stored in a queue from which it is read and displayed on a monitor or printed with baseline wander removed.

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patent: 5025724 (1991-06-01), Albert et al.
patent: 5117833 (1992-06-01), Albert et al.
David W. Mortara, Digital Filters for ECG Signals, Computers in Cardiology, pp. 511-514 (IEEE, 1977).
Gradwohl, J. R., et al., Comparison of Two Methods for Removing Baseline Wander, Computers in Cardiology, pp. 493-496 (IEEE, 1988).
Franket et al., A Filter to Suppress ECG Baseline Wander and Preserve ST-Segment Accuracy in a Real-time Environment, Journal of Electrocardiology, vol. 24, No. 4, pp. 315-323 (Oct. 4, 1991).
Pottala et al., Suppression of Baseline Wander in the ECG Using a Bilinearly Transformed, Null-phase Filter, Journal of Electrocardiology, vol. 22 Supp.

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