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    • 3. 发明授权
    • Method and apparatus for error correcting reproduced data
    • 用于对再现数据进行纠错的方法和装置
    • US5623459A
    • 1997-04-22
    • US436437
    • 1995-05-24
    • Ryuichi IwamuraShozo MasudaYoshiyuki Akiyama
    • Ryuichi IwamuraShozo MasudaYoshiyuki Akiyama
    • G11B20/18H03M13/27H03M13/35G11B7/00
    • H03M13/35G11B20/1809G11B20/1833H03M13/27G11B2020/10666G11B2020/183
    • Data 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.
    • PCT No.PCT / JP94 / 01604 Sec。 371日期:1995年5月24日 102(e)日期1995年5月24日PCT 1994年9月28日PCT公布。 出版物WO95 / 09421 日期1995年4月6日数据被记录在具有内部奇偶校验和双奇偶校验的双奇偶校验的光盘1上,并且向其外加奇偶校验。 内部奇偶校验被添加到已经被进行交织处理的数据中,并被用于校正内部代码。 外部奇偶校验被添加到不会进行交织处理的数据,并用于校正外部代码。 来自光盘1的再现数据被传送到环形缓冲存储器5并被存储在其中。 此外,还将再现数据传送到错误校正电路71,在错误校正电路71处校正外部码。 更正的结果传递给环形缓冲存储器5并被覆盖。 存储在环形缓冲存储器5中的数据第二次被读出到纠错电路71。 因此,内码被校正。 用于进行外码校正的数据用于检测扇区检测电路72中的扇区地址。在特殊再现时,仅进行外码校正。