Abstract
Sound table tennis (STT) is the table tennis for visually handicapped person. There is a foul called the holding in STT. We tried to develop the judgment technique for holding in STT using batted ball sound Firstly, frequency characteristics of impact sounds of a racket, a ball and a table were measured, and then natural frequencies of them were determined. We proposed judgment technique of a batted ball sound based on the characteristic of the natural frequency. Finally, the effectiveness of the proposed method has been demonstrated.
