Abstract
The article describes the results of studying and analyzing phonocardiograms (PCGs) obtained during a physiological experiment with Blu-ray standard equipment. It provides the findings of a spectral and spectral-time analysis for signals with a sampling frequency of 10, 44.1 and 192 kHz. It shows that the differences in the PCG spectra of identical signals are unreliable. The article specifies the onset and disappearance moments of the harmonic components of heart sounds. It also provides recommendations on the sampling frequency and bit resolution of digitized PCG signals for telemetric systems.
Highlights
The World Health Organization reports that, in 2016, 17.9 million people died of cardiovascular diseases (CVDs) in the world
It is about 31% of all fatal cases. 85% of these fatal cases were caused by heart attacks and strokes
Many experts believe that up to 60% of the fatal cases caused by a premature stroke and infarction could be prevented if deceased patients from the risk groups were provided with professional medical care in due time
Summary
The World Health Organization reports that, in 2016, 17.9 million people died of cardiovascular diseases (CVDs) in the world It is about 31% of all fatal cases. The development of equipment utilizing up-to-date cardiologic signal analysis approaches, including artificial intelligence elements, requires a test signal library Such a library should include normal, physiological signals and potential pathological changes in electrocardiograms (ECGs) and phonocardiograms (PCGs). The development of such a library itself is a serious challenge requiring the involvement of high-cost experts and a sufficient amount of records to choose the most illustrative examples Such libraries are often used for educational purposes: for instance, PCG records meant for medical students are freely available (e.g., [2]). These records contain all known heart sounds and pathological side tones
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