| 摘要 |
PURPOSE: A device for gaining and displaying a hit point on a target is provided to quickly and exactly display the hit point on the target with a numerical value and an image by using the time difference of a sound wave. CONSTITUTION: A plurality of sound wave detecting units(1a,1b,1c) are installed at one side of a target(3) at regular intervals, and detects a sound wave. A timer measures the time difference of signals output from the sound wave detecting unit(1a,1b,1c). A processor calculates positional information with the measured time difference. A numerical value displaying device(17) displays the positional information with a numerical value, and an image displaying device(15) displays the positional information with an image.
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