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Open AccessArticle

A Low-Noise-Level Heart Sound System Based on Novel Thorax-Integration Head Design and Wavelet Denoising Algorithm

School of Fundamental Sciences, China Medical University, Shenyang 110122, China
School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
Author to whom correspondence should be addressed.
Micromachines 2019, 10(12), 885;
Received: 19 October 2019 / Revised: 8 December 2019 / Accepted: 13 December 2019 / Published: 17 December 2019
Along with the great performance in diagnosing cardiovascular diseases, current stethoscopes perform unsatisfactorily in controlling undesired noise caused by the surrounding environment and detector operation. In this case, a low-noise-level heart sound system was designed to inhibit noise by a novel thorax-integration head with a flexible electric film. A hardware filter bank and wavelet-based algorithm were employed to enhance the recorded heart sounds from the system. In the experiments, we used the new system and the 3M™ Littmann® Model 3200 Electronic Stethoscope separately to record heart sounds in different noisy environments. The results illustrated that the average estimated noise ratio represented 21.26% and the lowest represented only 12.47% compared to the 3M stethoscope, demonstrating the better performance in denoising ability of this system than state-of-the-art equipment. Furthermore, based on the heart sounds recorded with this system, some diagnosis results were achieved from an expert and compared to echocardiography reports. The diagnoses were correct except for two uncertain items, which greatly confirmed the fact that this system could reserve complete pathological information in the end. View Full-Text
Keywords: flexible electric film; wavelet denoising; digital stethoscope flexible electric film; wavelet denoising; digital stethoscope
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Zhang, S.; Zhang, R.; Chang, S.; Liu, C.; Sha, X. A Low-Noise-Level Heart Sound System Based on Novel Thorax-Integration Head Design and Wavelet Denoising Algorithm. Micromachines 2019, 10, 885.

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