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    12.
    发明专利
    未知

    公开(公告)号：DE69322601D1

    公开(公告)日：1999-01-28

    申请号：DE69322601

    申请日：1993-10-28

    Applicant: SONY CORP

    Inventor： FUJITA GORO ,  TOBITA MINORU

    IPC: G11B7/005 ,  G11B20/10 ,  G11B20/18

    Abstract: In an optical information recording or reproducing apparatus, an asymmetry detection circuit (16) detects asymmetry values from digital RF signals reproduced from the reference area of an optical disk (3) according to a timing signal generated by a timing signal generator (13). The digital RF signals are demodulated by the viterbi algorithm by a viterbi detection circuit (17) on the basis of asymmetry values detected by an asymmetry detection circuit (16).

    17.
    发明专利
    未知

    公开(公告)号：DE69833590T2

    公开(公告)日：2006-12-07

    申请号：DE69833590

    申请日：1998-06-18

    Applicant: SANYO ELECTRIC CO ,  SHARP KK ,  FUJITSU LTD ,  SONY CORP

    Inventor： TOBITA MINORU ,  MAEDA SHIGEMI ,  HIOKI TOSHIAKI ,  MATSUURA MICHIO

    IPC: G11B7/007 ,  G11B7/24 ,  G11B7/00 ,  G11B7/005 ,  G11B7/09 ,  G11B7/095 ,  G11B11/105 ,  G11B27/19 ,  G11B27/30

    Abstract: An optical disc and an optical disc drive for the optical disc are provided which are suitable for recording data with a high density. The optical disc D uses both lands and grooves as recording tracks. Each of the tracks consists of one address segment and forty five data segments. The address segment is wobbled at one side thereof. Each of the data segments is a DC groove. The address segment records an address information including a sync signal, frame address, track address and CRC, a tilt pattern and a clock mark. The clock mark is adapted to reflect laser beam in one amount before the mark and in another amount after the mark. The tilt pattern has a different track pitch from those in other areas. The data segments record data magneto-optically.

    METHOD FOR RECORDING/REPRODUCING DATA, DATA REPRODUCING DEVICE, AND RECORDING MEDIUM
    18.
    发明专利
    METHOD FOR RECORDING/REPRODUCING DATA, DATA REPRODUCING DEVICE, AND RECORDING MEDIUM 未知

    公开(公告)号：MY119491A

    公开(公告)日：2005-06-30

    申请号：MYPI9503734

    申请日：1995-12-04

    Applicant: SONY CORP

    Inventor： SAKO YOICHIRO ,  YAMAGAMI TOMATSU ,  OTSUKA SATOSHI ,  TOBITA MINORU

    IPC: G11B20/12

    Abstract: WHEN DATA IS RECORDED ON A RECORDING MEDIUM SUCH AS AN OPTICAL DISK AND REPRODUCED, IF BURST ERROR OCCURS, THE PROCESSING CAN BE CARRIED OUT WITHOUT LESSENING A DATA RECORDING CAPACITY. WHEN DATA IS RECORDED, A FIRST ERROR-CORRECTING CODE (EI; I = 1.. .N.. .N) IS GENERATED WITH RESPECT TO A SERIES OF DATA OF A PREDETERMINED AMOUNT. THE FIRST ERROR-CORRECTING CODE (EI; I = 1.. .N.. .N) ADDED TO DATA OF THE PREDETERMINED AMOUNT FROM WHICH THE FIRST ERROR-CORRECTING CODE (EI; I = 1.. .N...N) IS GENERATED. A SECOND ERROR-CORRECTING CODE (PI, QI) IS GENERATED WITH RESPECT TO A SERIES OF DATA OF THE PREDETERMINED AMOUNT. THE SECOND ERROR-CORRECTING CODE (PI, QI) IS ADDED TO DATA OTHER THAN DATA OF THE PREDETERMINED AMOUNT FROM WHICH THE SECOND ERROR-CORRECTING CODE (PI, QI) IS GENERATED AND THEN RECORDED ON A RECORDING MEDIUM. UPON REPRODUCTION, DATA OF A CERTAIN RECORDING UNIT IS REPRODUCED FROM A RECORDING MEDIUM ON WHICH DATA OF RESPECTIVE RECORDING UNITS ARE RECORDED. IT IS DETERMINED ON THE BASIS OF THE FIRST ERROR-CORRECTING CODE (EI; I = 1.. .N.. .N) CONTAINED IS REPRODUCED DATA OF RECORDING UNITS WHETHER ERRORS CAN BE DETECTED AND CORRECTED. IF THE ERRORS CAN BE DETECTED AND CORRECTED, THEN THE ERRORS CAN BE DETECTED AND CORRECTED. IF THE ERRORS CANNOT BE DETECTED AND CORRECTED, THEN ERASURE INFORMATION IS GENERATED ON THE BASIS OF THE SECOND ERROR-CORRECTING CODE (PI, QI) CORRESPONDING TO THE DATA OF A CERTAIN RECORDING UNIT REPRODUCED FROM THE RECORDING UNIT WHICH CONTAINS THE SECOND ERROR-CORRECTING CODE (PI, QI) CONCERNING THE DATA OF A CERTAIN RECORDING UNIT AND THE DATA OF A CERTAIN RECORDING UNIT IS ERASED AND CORRECTED BY USE OF THE ENSURE INFORMATION AND THE FIRST ERROR-CORRECTING CODE (EI; I = 1.. .N) (FIG.1)

    19.
    发明专利
    未知

    公开(公告)号：DE69532231D1

    公开(公告)日：2004-01-15

    申请号：DE69532231

    申请日：1995-09-06

    Applicant: SONY CORP

    Inventor： SAKO YOICHIRO ,  YAMAGAMI TAMOTSU ,  OTSUKA SATOSHI ,  TOBITA MINORU

    IPC: G11B20/12 ,  G11B20/18

    Abstract: Data recorded on such a recording medium as an optical disk, are reproduced excellently even when burst errors occur during reproduction, without reducing the data record capacity of the recording medium. A first error correcting code is generated for every block of a certain amount of data, and added to the corresponding block, a second error correcting code is generated for the every block and added to the other blocks than the block for which the second error correcting code is generated. These data and codes are recorded on the recording medium. When reproducing the data, recorded on the recording medium in blocks of data, whether or not detection correction is possible or not is judged based on the first error correcting codes included in the reproduced data. When the detection correction of a block is possible, the detection correction is performed, and when impossible, missing information is generated based on the second error correcting codes reproduced from the data blocks and corresponding to the block of which detection correction is impossible. Using the missing information and the first error correcting code, missing correction of the data block is performed.

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