Exploring Microphone Technologies for Digital Auscultation Devices

Author:

Zauli Matteo1ORCID,Peppi Lorenzo Mistral1,Di Bonaventura Luca2,Arcobelli Valerio Antonio3ORCID,Spadotto Alberto45ORCID,Diemberger Igor45ORCID,Coppola Valerio1ORCID,Mellone Sabato3ORCID,De Marchi Luca3ORCID

Affiliation:

1. ARCES—Advanced Research Center on Electronic Systems for Information and Communication Technologies “Ercole De Castro”, University of Bologna, 40136 Bologna, Italy

2. STMicroelectronics, ARCES, 40136 Bologna, Italy

3. Department of Electrical, Electronic, and Information Engineering “Guglielmo Marconi”, University of Bologna, 40136 Bologna, Italy

4. Institute of Cardiology, Department of Medical and Surgical Sciences, University of Bologna, Policlinico S.Orsola-Malpighi, via Massarenti 9, 40138 Bologna, Italy

5. UOC di Cardiologia, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Dipartimento Cardio-Toraco-Vascolare, via Massarenti 9, 40138 Bologna, Italy

Abstract

The aim of this work is to present a preliminary study for the design of a digital auscultation system, i.e., a novel wearable device for patient chest auscultation and a digital stethoscope. The development and testing of the electronic stethoscope prototype is reported with an emphasis on the description and selection of sound transduction systems and analog electronic processing. The focus on various microphone technologies, such as micro-electro-mechanical systems (MEMSs), electret condensers, and piezoelectronic diaphragms, intends to emphasize the most suitable transducer for auscultation. In addition, we report on the design and development of a digital acquisition system for the human body for sound recording by using a modular device approach in order to fit the chosen analog and digital mics. Tests were performed on a designed phantom setup, and a qualitative comparison between the sounds recorded with the newly developed acquisition device and those recorded with two commercial digital stethoscopes is reported.

Funder

Italian Ministry for Education, University and Research

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Mechanical Engineering,Control and Systems Engineering

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