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US 6,785,573 B2Granted
Low distortion ECG filter
AssigneeCardiac Pacemakers, Inc.
InventorsVladimir V. Kovtun, Randall Dodson, Joseph E. Bange
Life of this patent
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Abstract
A low pass filter especially adapted for use with ECG equipment designed to negate any noise energy that may be superimposed upon the ECG signal itself. A plurality of low-pass FIR filter stages are connected in tandem between a signal input point and a signal output point where each of the stages has a distinct cut-off frequency characteristic. Means are provided for selectively turning ones of the plurality of stages on or off.
Claims2
A method of processing ECG signals comprising the steps of:
- (a) applying amplified analog waveforms representative of ecg vectors to an analog-to-digital converter;
- (b) obtaining digital values from the analog-to-digital converter representative of the amplitude of the ecg vector signals at discrete sampling times;
- (c) storing the digital values in a multi-stage time delay buffer;
- (d) computing from the stored digital values a scaled noise signal falling within a first predetermined frequency band;
- (e) dynamically determining upper and lower limits for the scaled noise signal computed in step (d);
- and
- (f) subtracting the signal computed in step (d) from a data sample stored in a predetermined stage of the time delay buffer to yield an output signal devoid of noise falling within said first predetermined frequency band.
4 more elements
Dependencies are inferred from the claim text.