公开(公告)号：US4471491A

公开(公告)日：1984-09-11

申请号：US462796

申请日：1983-02-01

申请人： Akira Abe ,  Hiromi Hashimoto ,  Toshiyuki Takenaka ,  Koyo Taniguchi

发明人： Akira Abe ,  Hiromi Hashimoto ,  Toshiyuki Takenaka ,  Koyo Taniguchi

IPC分类号： H04B1/74 ,  H04B7/15 ,  H04B17/00 ,  H04B17/02 ,  H04B17/40 ,  H04B3/36 ,  H04B7/14

CPC分类号： H04B7/15542 ,  H04B1/74 ,  H04B17/0087

摘要： A service channel signal transmission system in which a service channel signal is constantly fed to at least two radio channels in parallel. Each intermediate repeater station has a service channel demodulator which is constantly connected to either one of the radio channels. A combining and switching circuit automatically switches over the service channel demodulation to the other radio channel in response to an alarm output which indicates an abnormality in a received signal at a receiver associated with the one radio channel. The service channel is completely switched from one to the other without resorting to line switchover control signals from terminal stations.

摘要翻译： 一种服务信道信号传输系统，其中服务信道信号被不断地馈送到并行的至少两个无线电信道。 每个中间中继站具有不断连接到无线电信道之一的服务信道解调器。 组合和切换电路响应于指示在与一个无线电信道相关联的接收机处的接收信号中的异常的报警输出，自动地将服务信道解调切换到另一个无线电信道。 服务通道完全从一个切换到另一个，而不需要使用来自终端站的线路切换控制信号。