Real-time artifact removal from waveforms using a dynamic filter

Details Real-time artifact removal from waveforms using a dynamic filter Real-time artifact removal from waveforms using a dynamic filter

1994-07-27

1996-04-30

Kamm, William E.

Surgery

Truss

Pad

128670, 128700, A61B 50205, A61B 50456

Patent

active

055115543

ABSTRACT:
During sampling, a finite impulse response (FIR) filter separates a composite signal into two components, non-cardiac physiological phenomena and cardiac artifacts. The length of the filter window dynamically varies to produce an output signal in which the cardiac frequency and any associated harmonics are suppressed with a fixed delay. The FIR filter is applied to the patient signal and lags the patient signal by at least one interval between triggering events. When the present interval between triggering events passes by the filter window, the window length is gradually adjusted to have the same length as the next period such that the window length is centered between two adjacent triggering events. The difference between the present interval and the next interval is evenly distributed or subtracted across the filter window between centerings.

REFERENCES:
patent: 5392780 (1995-02-01), Ogino et al.

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