| 摘要 |
<p>PURPOSE:To ensure a common use to both a subframe synchronizing circuit and a multiframe synchronizing circuit for a synchronism protecting circuit which is provided with several stages of counters and a latching circuit, by adding a selecting circuit including a logic element. CONSTITUTION:When a subframe synchronism is secured, the output of a subframe marker detecting circuit 101 is fed to the input terminals 7 and 8 of a coincidence circuit 402 and a discordance circuit 403 respectively via a selecting circuit 401. The subframe counter stopping signal is fed to a frame counter 201 from an output terminal 14 of a latching circuit 404 via the circuit 401. During this process, the subframe synchronism is secured. The multiframe synchronism is secured by switching the circuit 401.</p> |
