| 摘要 |
PURPOSE:To ensure an output of a proper RESYNC by outputting a position estimate pulse with priority when 2>= RESYNC signals are detected in a window and any of them is located at a position the same as that of the position estimate pulse. CONSTITUTION:The detection circuit is provided with a RESYNC pattern matching circuit 1, a window circuit 2, delay circuits 3-9, a pulse presence discrimination circuit 11, a normal RESYNC pulse presence discrimination circuit 12, a SYNC detection circuit 13, a selector 14, an OR gate circuit 15, a D flip- flop 16 and an AND gate circuit 17. In this case, when 2>= RESYNC signals in a window are detected and any of them is at the same position as the position estimate pulse, the pulse is outputted with priority. Thus, even when a false RESYNC pattern appears, the RESYNC is correctly detected and the correct operation is ensured. |
