Analysis of the Parameters of Frequency Filtering of an Electrocardiograph Signal

The features of the processing of an electrocardiograph signal using band-pass frequency filtering on a background of distorting interference and noise of different kinds are analyzed. An approach to choosing the optimum passband and type of bandpass filter is proposed, based on the criterion of maximizing the signal-to-noise ratio at the filter output and minimizing the signal distortions, taking into account the variability of the heart rhythm. Two versions of such a bandpass filter are considered, namely, an analog active 2nd order filter and a digital 8th order filter.