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. 2020 May 10;20(9):2726. doi: 10.3390/s20092726

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Schematic of electrical connections for the sound acquisition. The signal of ADMP401 microphone is acquired by means of Behringer UCA222 USB audio card which is connected to the Raspberry Pi board.