| 摘要 |
PURPOSE:To realize a multi-frame synchronizing system with small circuit scale by writing/reading conversion data into/from a memory when the positions of pattern reference signal coincide in multi-frames. CONSTITUTION:A couple of counters 1 consisting of a free running basic frame counter 11 which is reset whenever clocks for one multi-frame in m-number of basic frames are counted, and a multi-frame counter 12, a synchronous code detection part 2, an offset holding part 3 holding an offset value from the zero value of the discrete value of the counters 1 and a timing generation part 4 are provided. When the positions of the pattern reference code 0 of a synchronous code F in (m) basic frames of the input multi-frame coincide in (n) multi- frames, conversion data D which a serial/parallel conversion part 10 has converted are constituted to be written into and read from the memory 30 with the timing signal which the timing generation part 4 is generated as address. Thus, the synchronous circuit of various multi-frames and a multi-frame conversion circuit after synchronization can be realized with a simple circuit constitution. |
