| 摘要 |
PURPOSE:To prevent the out of synchronism of VTR reproduction for digital data, by using the synchronizing pulse of the rotary head as the reference of leading-in. CONSTITUTION:SYNC pulse is generated when the beginning end pulse each track from the terminal 33 to the synchronizing pattern coincidence circuit 32 which counts the set value and is driven with the clock from the terminal 33 and the reproducing synchronizing pattern every data section are in agreement. The pulse generator 36 making correction by taking this pulse as lead-in, counts the clock to produce the synchronizing pulse, and the synchronizing pulse only having no out of synchronism produced by the correction pulse generator 35 counting the clock is outputted via the AND gates 41, 39, FF 40 and OR gate 45, which are opened at the window pulse period produced by the window signal generator 34 taking the synchronizing pulse of the rotary head as lead-in. Accordingly, even if there is missing in the synchronizing pattern such as dropout, the synchronizing pulse without of synchronism can be formed to enable to reproduce the digital data excellent without out of synchronism. |
