| 摘要 |
PCT No. PCT/JP94/01604 Sec. 371 Date May 24, 1995 Sec. 102(e) Date May 24, 1995 PCT Filed Sep. 28, 1994 PCT Pub. No. WO95/09421 PCT Pub. Date Apr. 6, 1995Data is recorded onto optical disc 1 with double parity of inner parity and outer parity being added thereto. Inner parity is added to data which has been caused to undergo interleaving processing and is used for correction of inner code. Outer parity is added to data which is not caused to undergo interleaving processing and is used for correction of outer code. Reproduction data from optical disc 1 is delivered to ring buffer memory 5 and is stored thereinto. Further, the reproduction data is delivered also to error correcting circuit 71, at which outer code is corrected. Corrected result is delivered to ring buffer memory 5 and is overwritten thereat. Data stored in ring buffer memory 5 is read out to error correcting circuit 71 for a second time. Thus, inner code is corrected. Data caused to undergo outer code correction is used for detection of sector address in sector detecting circuit 72. At the time of special reproduction, only outer code correction is carried out.
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