A Three-Dimensional Method for Analysis of the Body Mode of Classical Guitars Using a Laser Displacement Sensor

Kuan Cheng Su, Tsung Yu Hsieh, Wei Chih Lin, Fu Li Hsiao, Tatyana Ryzhkova, Chii Chang Chen

Research output: Contribution to journalArticlepeer-review

Abstract

In classical guitar acoustic spectra, the lowest frequency body mode’s 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’s 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.

Original languageEnglish
Article number5147
JournalSensors (Switzerland)
Volume24
Issue number16
DOIs
StatePublished - Aug 2024

Keywords

  • acoustic spectra
  • body mode
  • classical guitars
  • laser displacement sensor
  • timbre

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