| 摘要 |
<p>When a whistle (1) is blown, whistle information is created in the whistle. A lamp device (2) receives a radio signal transmitted from the whistle (1), demodulates the whistle information, and performs lamp lighting in accordance with the intensity of the whistle sound based on the whistle information. Thus, it is possible to notify that the whistle has been blown and its intensity through visual perception. Thus, even a person having auditory difficulties can know that the whistle has been blown and can concentrate on the playing at ease.</p> |
