| 摘要 |
PROBLEM TO BE SOLVED: To prevent an increase in a circuit scale by speedily performing processings, in an unscramble calculation processing. SOLUTION: By performing scramble calculations in a plurality of bits every time one piece of clock is inputted, by generating data of a plurality of bits in batch for performing the following scramble calculation from data for performing the preceding scramble calculation, by using a decoder circuit 5, and thus the time for processing the main data of all the data sectors by the unscramble calculations can be shortened, and a circuit composition also preventing increase in the circuit scale is realized.
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