| 摘要 |
PURPOSE:To prevent the deterioration the burst error correction length by expanding the final interleave interval of the P series and reversing the direction of retarding the interleave so as to locate the final word of the Q series after the preceding word. CONSTITUTION:The final interleave interval of the P series is expanded as to the P and Q series with respect to an optional word and the interleaving is applied to restore a word W7 and the Q series in reverse direction so as to locate the final word of the Q series after the recording word. Thus, even if an error exceeding the correctable burst error length takes place, the remaining error is reduced. Moreover, in order to improve the error correction capability at the simultaneous occurrence of a burst error and a random error, it is preferred to take the largest interleave delay quantity (quantity of restoration) in the reverse direction. Thus, the deterioration in the burst error correction capability is prevented and the deterioration in general error correction capability is prevented.
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