Abstract
The design and substantiation of the pNLF filter based on a non-local averaging filter modification is presented. The filter is used for solving the problem of heart sounds amplification on fetal and human phonocardiograms for further tone segmentation and heart rate calculation relevant for fetal monitoring. The parameters for choosing the filter and the prospects for its optimization for specific tasks are presented. The data and results of filtration performed by the pNLF on fetus and human phonocardiograms recorded by using different acoustic sensors are provided.
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