Dynamic filter for real-time artifact removal from waveforms

Details Dynamic filter for real-time artifact removal from waveforms Dynamic filter for real-time artifact removal from waveforms

1993-10-12

1996-04-02

Kamm, William E.

Surgery

Truss

Pad

128695R, 607 9, A61B 508

Patent

active

055031609

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. 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 triggering events are synchronized with the endpoints of the filter window at the start of each interval. The difference between the present interval and the next interval is evenly distributed or subtracted across the filter window between synchronizations.

REFERENCES:
patent: 4781201 (1988-11-01), Wright et al.
patent: 5188117 (1988-02-01), Steinhaus et al.

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