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Simplified Three-Microphone Acoustic Test Method

United States Department of Agriculture-Agricultural Research Services, Lubbock, TX 79403, USA
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Instruments 2017, 1(1), 4; https://doi.org/10.3390/instruments1010004
Received: 22 February 2017 / Revised: 22 June 2017 / Accepted: 13 July 2017 / Published: 28 July 2017
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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Pelletier, M.G.; Holt, G.A.; Wanjura, J.D. Simplified Three-Microphone Acoustic Test Method. Instruments 2017, 1, 4.

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