| 摘要 |
A relay broadcasting system for ball games is provided to relay various vivid sounds to speakers installed at a playing field by embedding a sound output device, which converts peripheral sounds into electrical signals and outputs them at a specific frequency band, in a ball which is used in a ball game. A relay broadcasting system for ball games comprises a stadium(10), a ball, goal posts(16), a receiver(18), an electric bulletin board(22) and speakers(20). The stadium comprises a ground(12) and stands. The ball contains a sound output device. At each of the goal posts, an electromagnetic induction antenna is installed. The receiver outputs a detection signal to the electromagnetic induction antennas of the goal posts in order to detect an electromagnetic inductor. If an electromagnetic inductor is detected, the receiver counts a score and outputs a score message. Also the receiver receives and outputs signals which are transmitted from the ball by wireless. The electric bulletin board displays the score message. The speakers convert voice signals, outputted from the receiver, into audible sounds. |
