Headphone concert system |
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| 申请号 | JP8706081 | 申请日 | 1981-06-06 | 公开(公告)号 | JPS57202138A | 公开(公告)日 | 1982-12-10 |
| 申请人 | Nippon Hoso:Kk; | 发明人 | IGUCHI MIKIO; UENO OSAMU; OGURA TOUTAROU; | ||||
| 摘要 | PURPOSE:To prevent sound interference in a concert hall, by transmitting sound signals such as music on a weak electromagnetic wave, receiving the said electromagnetic wave with a receiver of each listner, so that each listner can enjoy the music with a headphone. CONSTITUTION:On a stage 2 of a concert hall, a tape player 3 and a record player 4 are provided, electric signal from them and an audio signal from a commentator are mixed with a mixer 7 and are supplied to a transmitter 10, where an electromagnetic wave with a prescribed frequency and a weak output is transmitted from an antenna 10(15muV/100m). On the other hand, each listner carries its receiver 13, takes a seat as the desires, the said transmitted electromagnetic waves are received to enjoy the music with a headphone 13a. An electric field strength monitoring device 14 is provided around the concert hall, if the electric field is a prescribed value or over, an output adjusting device 15 is controlled to lower the transmission output. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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