Development of a channel for recording phonocardiograms in electronic stethoscopes

摘要

The article deals with the problem of developing a channel for recording phonocardiograms in electronic stethoscopes. The development of a channel for recording phonocardiograms for the further development of electronic stethoscopes is an actual task in the field of biomedical engineering for today. When registering phonocardiograms with an acoustic microphone (sensor) located on the patient's torso, the impact of environmental noise is unavoidable. To eliminate this interference, it is proposed to use a sequential filtering of interference, based on the model of an additive mixture of phonocardiograms and interference. Sequential filtering is implemented on the basis of active band pass filters for later increasing the accuracy and identification of phonocardiogram patterns. Unlike common band pass filters, this sequential filtering algorithm allows you to strengthen low-frequency sound waves of the heart and improve the accuracy of identifying the components of phonocardiograms. In order to demonstrate the work of the proposed approach, the article proposes the results of modeling in the environment of Proteus. The results of the study show the limitations of all methods of processing phonocardiograms used in electronic stethoscopes.