| 摘要 |
PURPOSE:To sent a data without decreasing transmission enable information quantity by sending a parity but pattern comprising a parity bit of all frames of each multi-fame as a prescribed pattern. CONSTITUTION:When a synchronizing detection counter 14 reaches a set value P, a Q output of a flip-flop 20 goes to a high level, the counter 14 and an out of synchronism detection counter 16 are reset and a signal representing the multi-frame synchronizing state is being outputted from the Q output. When the counter 16 reaches a set value R before the set value P is reached, a Q output of the flip-flop 20 goes to a high level and the counters 14, 16 are reset and a signal representing the multi-frame out of synchronism is being outputted from, the inverse of Q output. further, an output (h) of the counter 16 shifts the frame recoginized to be the head of the multi-frame by one frame. Then the detection is being executed until the multi-frame synchronization is take. |
