Device for filtering ECG signals

Details Device for filtering ECG signals Device for filtering ECG signals

1997-06-03

1998-06-30

Kamm, William E.

Surgery

Diagnostic testing

Cardiovascular

A61B 50428

Patent

active

057726035

ABSTRACT:
A device for filtering ECG signals has an A/D converter and a filter unit connected to the converter's output. The filter unit includes a filter, or a combination of filters with a non-linear phase response such that signals with frequencies in the passband of the filter, or the combination of filters, are delayed more than signals with frequencies in the transition band between the passband and the suppressed frequency band of the filter, or the combination of filters. A method for producing an FIR filter, with a phase response opposite to the phase response of a filter for filtering out DC components, or an IIR filter, suitable for use in the above-described device, is also disclosed in which the impulse response from the filter for filtering out DC components and low-frequency components or the IIR filter is reversed in time and sampled. The sampled values are then used for determining coefficients for the FIR filter.

REFERENCES:
patent: 3580243 (1971-05-01), Johnson
patent: 5297557 (1994-03-01), Reichl
patent: 5318036 (1994-06-01), Arand et al.
patent: 5333616 (1994-08-01), Mills et al.
patent: 5406955 (1995-04-01), Bledsoe et al.
patent: 5411029 (1995-05-01), Hirei

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