| 摘要 |
<p>The device has a panel provided with a frame (1) to which a set of slabs (2) is fixed with flexible legs by a set of screws. The slabs receive impact of ball. The slabs are provided with a set of overlaid numbers (5) or letters or drawings. A set of impact detectors is connected to a light source by wire bundles. The light source is connected with a housing interface by the wire bundles. The interface is connected to a calculation and storage unit that is connected to a sound apparatus with a display unit and a camera.</p> |
