Adjustement of wavelet function parameters for analysis of non-stationary periodic signals with multistart optimization

The technique for selecting the length of the wavelet function carrier for determining the coordinates of the extrema of periodic signals is given. This technique is based on multi-start optimization with the wavelet transform. Such an approach makes it possible to increase noise resistance and reduce sensitivity to local extrema of periodic signals. The evaluation of the possibilities of this method was carried out by determining the coordinates of the QRS-complexes of the electrocardiograms. The error in determining the QRS-complexes with an increase in noise level is investigated.