{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T16:14:55Z","timestamp":1760112895406,"version":"build-2065373602"},"reference-count":24,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2024,8,9]],"date-time":"2024-08-09T00:00:00Z","timestamp":1723161600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Science and Technology Council, Taiwan","award":["NSTC 112-2221-E-008-089"],"award-info":[{"award-number":["NSTC 112-2221-E-008-089"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In classical guitar acoustic spectra, the lowest frequency body mode\u2019s amplitude often significantly surpasses that of the string overtones. However, the characteristics of the body mode have not been systematically utilized to quantitatively represent the timbre of classical guitars. In this study, we propose a quantitative method for describing the body mode, which can effectively differentiate the timbre of classical guitars. Our approach involves three key parameters presented in a three-dimensional space, as follows: the frequency and quality factors of the body mode, along with the amplitude ratio of the plucked string note to the body mode in the soundboard\u2019s vibration spectrum. This representation allows for the visualization, quantitative comparison, and classification of the body mode note and damping properties across classical guitars. The differences in body mode among guitars can be analyzed quantitatively using Euclidean distance.<\/jats:p>","DOI":"10.3390\/s24165147","type":"journal-article","created":{"date-parts":[[2024,8,9]],"date-time":"2024-08-09T07:59:07Z","timestamp":1723190347000},"page":"5147","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Three-Dimensional Method for Analysis of the Body Mode of Classical Guitars Using a Laser Displacement Sensor"],"prefix":"10.3390","volume":"24","author":[{"given":"Kuan-Cheng","family":"Su","sequence":"first","affiliation":[{"name":"Department of Optics and Photonics, National Central University, Jhung-Li, Taoyuan 320, Taiwan"}]},{"given":"Tsung-Yu","family":"Hsieh","sequence":"additional","affiliation":[{"name":"Department of Optics and Photonics, National Central University, Jhung-Li, Taoyuan 320, Taiwan"}]},{"given":"Wei-Chih","family":"Lin","sequence":"additional","affiliation":[{"name":"Department of Optics and Photonics, National Central University, Jhung-Li, Taoyuan 320, Taiwan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6362-8127","authenticated-orcid":false,"given":"Fu-Li","family":"Hsiao","sequence":"additional","affiliation":[{"name":"Institute of Photonics, National Changhua University of Education, Changhua 500, Taiwan"}]},{"given":"Tatyana","family":"Ryzhkova","sequence":"additional","affiliation":[{"name":"Independent Researcher, Sudweyher Str. 13, 28857 Syke, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8945-214X","authenticated-orcid":false,"given":"Chii-Chang","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Optics and Photonics, National Central University, Jhung-Li, Taoyuan 320, Taiwan"}]}],"member":"1968","published-online":{"date-parts":[[2024,8,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Siedenburg, K., Saitis, C., McAdams, S., Popper, A.N., and Fay, R. 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