| 摘要 |
PROBLEM TO BE SOLVED: To determine the best hit point of an opponent to which a ball is hit back by predicting the track of the ball. SOLUTION: This device is equipped with a table-tennis table 31, a racket 32, a plurality of microphones 35 which collect sound in the space wherein the ball 33 is present, a timer 36 which measures a time, and a computing means 37 which computes the generation source of the sound and the movement position of the ball from sound information collected by the microphones 35 and time information obtained by the timer 36. Consequently, the track of the ball 33 which moving between players can easily be computed at any time through the very simple constitution and the track of the ball can be predicted by using the computation result.
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