Abstract
In the research of the tone quality of a classic guitar, the measurement of the mode of vibration of the surface board is important. It is necessary to measure various guitars chosen by the musician, and to evaluate the comparison between tone quality and the vibration characteristic in the accumulation senses. Because surface boards of valuable musical instruments are damaged, the hammering cannot be done. Moreover, a lot of measurement points are necessary to measure the mode of vibration to the high frequency region. It proposes the method of measuring the adjacent sound of the surface board the multipoint simultaneously.
