| 摘要 |
<p>PURPOSE:To ensure the reliability of a current/standby constitution, and to prevent the generation of a pull-out by allowing plural stuff synchronizing circuits which insert a stuffing pulse into the same signal to synchronously insert the stuff pulse. CONSTITUTION:In a preset system 1, the stuffing pulse is inserted into digital signals inputted to stuff synchronizing circuits 11 and 12, the stuff synchronization of the two digital signals is obtained, and those digital signals are multiplexed into one by a multiplexing part 13. In a preliminary system 2, the digital signals are inputted to stuff synchronizing circuits 21 and 22, and the same processing as the present system is operated. Then, the stuff synchronizing circuits 11 and 21 are constituted as one pair, the stuff synchronizing circuits 12 and 22 are constituted as one pair, and they are mutually connected and synchronously operated in a relation between the present/preliminary systems. Afterwards, one of the outputs of the present system 1 and the preliminary system 2 is selected by a high speed switch 3, and supplied to an antenna 4.</p> |
