| 摘要 |
PURPOSE:To prevent erroneous correction by generating an error flag indicating a correction invalidating period when step-out occurs in an error correcting process. CONSTITUTION:When a pulse passing detecting circuit 3 detects that a start pulse passes an end pulse 2, a flag generating circuit 4 outputs an error flag 5 from the position of the passing start pulse 1 along a block length required for the correction. Thus, the stop of the correction can be instructed, and the erroneous correction can be prevented. |
