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Instruments 2017, 1(1), 4; https://doi.org/10.3390/instruments1010004

Simplified Three-Microphone Acoustic Test Method

United States Department of Agriculture-Agricultural Research Services, Lubbock, TX 79403, USA
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Received: 22 February 2017 / Revised: 22 June 2017 / Accepted: 13 July 2017 / Published: 28 July 2017
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Abstract

Accepted acoustic testing standards are available; however, they require specialized hardware and software that are typically out of reach economically to the occasional practitioner. What is needed is a simple and inexpensive screening method that can provide a quick comparison for rapid identification of the top candidates. This research reports on the development of an acoustical rapid-test method that achieves these objectives. The method is based upon a reformulation of the well-regarded three-microphone method. The new formulation reduces the number of required microphones to a single microphone and removes the need for simultaneous capture and extensive signal-processing analysis. The study compares the proposed simplified method to two standard methods and the three-microphone method. The results of the correlation analysis between the new method versus the original method produced a coefficient of determination of r2 = 0.994. A simulation study highlighted several unique accuracy advantages of this new proposed method in comparison to the existing standard methods. The proposed new method represents an easy-to-use technique that requires little in the way of equipment and can be set up with minimal training and expense. View Full-Text
Keywords: acoustic testing; three-microphone method; two-microphone method; ASTM E1050; ISO 10534; ASTM E2611 acoustic testing; three-microphone method; two-microphone method; ASTM E1050; ISO 10534; ASTM E2611
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pelletier, M.G.; Holt, G.A.; Wanjura, J.D. Simplified Three-Microphone Acoustic Test Method. Instruments 2017, 1, 4.

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