University of Tsukuba, Japan
In the production of musical instruments, prototypes are evaluated by professional performers. It is empirically known that evaluation of musical instruments differs depending on the evaluator. However, the mechanism how human evaluates a musical instrument is not revealed. In this research, we newly proposed a human-instrument interaction model when a person evaluates a musical instrument to reveal its mechanism. For a basic study of the model, we measured human muscle activity and verified its trend when controlling the plucking parameters for the guitar. In the experiment, 5 subjects were asked to play a simple task with a plectrum under control the plucking position and dynamics. Subjects consist 4 experienced amateurs and 1 beginner. EMG of four muscles considered to be involved in the plucking motion using a plectrum and audio from the front magnetic pickup were measured simultaneously. As a result, the muscle activity due to the difference in the position has a large difference for each subject, and no specific trend was observed. The muscle activity due to the difference in the dynamics was found to have a certain tendency among subjects, such as muscle activity also increases and decreases with the increase and decrease of plucking dynamics.
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