Device for eliminating ringing in filtered ECG signals

Details Device for eliminating ringing in filtered ECG signals Device for eliminating ringing in filtered ECG signals

1994-06-27

1996-07-02

Malzahn, David H.

Boots, shoes, and leggings

36441306, G06F 1710, A61B 50402

Patent

active

055329519

ABSTRACT:
A device for eliminating ringing in filtered ECG signals includes an analog-to-digital for converting the ECG input signals into a series of digital values, and a filter unit connected to the output of the analog-to digital converter. The filter unit includes a recursive IIR-filter and a subsequent allpass filter with a phase shift which is equal to twice the phase shift of the IIR filter. The allpass filtering is performed time-reversed with respect to the IIR filtering. In a method for producing an allpass filter, for use in the above device, having a phase shift which is equal to twice the phase shift of an IIR filter, the IIR filter having zero points situated on the unity circle in the Z-plane, the zero points of the IIR filter are replaced by new zero points obtained by reflecting the poles of the filter in the unity circle in the Z-plane.

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"Detection of Late Potentials by Adaptive Filtering," Shelton et a., J. of Electrocardiology, vol. 23, (1990): Suppl., pp. 138-143.
"Highpass Filters for Detecting Late Potentials," Link et al, Proc. Computers in Cardiology (1992), pp. 159-162.

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