| 摘要 |
PURPOSE:To attain high speed read by detecting that consecutive synchronizing step-out in reading a data is more than a predetermined frame number so as to find out earlier the frame synchronizing step-out at read thereby attaining the rereading. CONSTITUTION:An asynchronizing frame number detection circuit 1 detecting that the number of consecutive synchronizing step-out in reading a data reaches a predetermined frame number or above, is provided, and when the number of synchronizing step-out of frame at data read reaches the predetermined frame number, the data read out is intermitted to apply rereading. The asynchronizing frame number detection circuit 1 detects the number of frames for synchronizing step-out by dividing the length of the period when a frame synchronization detection circuit 2 detects no frame synchronization by the frame period or counting an interpolation flag generated at every frame period. Thus, no useless time is required from data read and high speed read is attained.
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