| 摘要 |
The present invention relates to the radio broadcasting of programmes in confined spaces such as tunnels, underground car parks and bridges, which are usually devoid of reception or strongly interference-affected. It consists essentially of a player of endless cassettes C which is associated with a battery of transmitters 1, 2 and 3 adjusted to the respective frequencies of the various peripheral sets and connected to a wide electromagnetically closed loop B1 associated or not with one or more harnesses B2. The end of the harness B2 composed of a travelling section L, makes it possible to reduce and localise a zone of interference present between the outside transmission and the inside of the enclosure. <IMAGE>
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