公开(公告)号：DE60019014D1

公开(公告)日：2005-05-04

申请号：DE60019014

申请日：2000-04-17

Applicant: SONY CORP

Inventor： YOSHIMURA SHUNJI ,  FUKUMOTO ATSUSHI ,  KAI SHINICHI

IPC: G11B11/10 ,  G11B11/105 ,  G11B20/10

Abstract: The recording medium consists of a displacement layer (11), a switching layer (12) and a memory layer (13) formed in this order. The memory layer is composed of a perpendicular magnetizing film; the displacement layer is composed of another perpendicular magnetizing film whose magnetic wall reluctance is relatively smaller than that of the memory layer. The switching layer is composed of a magnetic layer whose Curie temperature is lower than those of the displacement layer and the memory layer. The reproduction apparatus includes a magnetic wall displacement detector for detecting generation of the magnetic wall displacement by the use of a differential signal of the reproduced signal obtained from a signal reproducer or by the use of a difference signal in the time base direction. A data detector (159) for detects data by the use of the detection signal obtained from the magnetic wall displacement detector. An independent claim is included for a data reproducing method.

公开(公告)号：DE69724201D1

公开(公告)日：2003-09-25

申请号：DE69724201

申请日：1997-02-07

Applicant: SONY CORP

Inventor： NAKAGAWA TOSHIYUKI ,  INO HIROYUKI ,  YOSHIMURA SHUNJI ,  KAI SHINICHI

IPC: G11B20/10 ,  G11B20/14 ,  G11B20/18 ,  H03M5/14 ,  H04L25/49

Abstract: In a data decoding apparatus of this invention, level of a reproduction RF signal 7a at the time of the binary level judgment of channel bit is temporarily stored into a RF signal level memory section 20. The portions which do not satisfy the conditions of the minimum run length and the maximum run length of the same symbols within the channel bit data train are respectively detected by a (d'-1) detecting section 16 and a (k'+1) detecting section 17. This data decoding apparatus comprises correction bit position detecting sections 18, 19 for outputting correction bit position designation signals on the basis of level of the RF signal at the time of the binary level judgment stored in the RF signal level memory section 20, and a bit data inversion correcting section 15 for inverting logic level of data at bit position designated on the basis of the correction bit position designation signals 18a, 18b, 19a, 19b. In the case where there exists any portion which does not satisfy the conditions of the minimum run length and/or the maximum run length of the same symbols within channel bit data obtained by binarizing a signal which has been read out from the recording medium, correction is implemented to the channel bit data, thereby making it possible to improve the bit error rate, and to ensure skew margin.

公开(公告)号：AU759808B2

公开(公告)日：2003-05-01

申请号：AU2769700

申请日：2000-04-12

Applicant: SONY CORP

Inventor： YOSHIMURA SHUNJI ,  FUKUMOTO ATSUSHI ,  KAI SHINICHI

IPC: G11B11/10 ,  G11B11/105 ,  G11B20/10

Abstract: The recording medium consists of a displacement layer (11), a switching layer (12) and a memory layer (13) formed in this order. The memory layer is composed of a perpendicular magnetizing film; the displacement layer is composed of another perpendicular magnetizing film whose magnetic wall reluctance is relatively smaller than that of the memory layer. The switching layer is composed of a magnetic layer whose Curie temperature is lower than those of the displacement layer and the memory layer. The reproduction apparatus includes a magnetic wall displacement detector for detecting generation of the magnetic wall displacement by the use of a differential signal of the reproduced signal obtained from a signal reproducer or by the use of a difference signal in the time base direction. A data detector (159) for detects data by the use of the detection signal obtained from the magnetic wall displacement detector. An independent claim is included for a data reproducing method.

公开(公告)号：DE60336928D1

公开(公告)日：2011-06-09

申请号：DE60336928

申请日：2003-12-24

Applicant: SONY CORP

Inventor： KAI SHINICHI ,  ARATANI KATSUHISA ,  KOUCHIYAMA AKIRA ,  NAKAGAWA KENZO ,  TAKEMOTO YOSHIHIRO

IPC: G11B7/26 ,  B29D11/00 ,  G03C5/00 ,  G11B20/18

公开(公告)号：DE69729042D1

公开(公告)日：2004-06-17

申请号：DE69729042

申请日：1997-10-08

Applicant: SONY CORP

Inventor： NAKAGAWA TOSHIYUKI ,  INO HIROYUKI ,  YOSHIMURA SHUNJI ,  KAI SHINICHI ,  SHIMPUKU YOSHIHIDE ,  IIDA MICHIHIKO ,  KAWASHIMA TETSUJI ,  SATO SHOJI

IPC: G11B20/10 ,  G11B20/14 ,  H03M7/00 ,  H03M7/14 ,  H04L25/49

Abstract: If there is any portion in channel bit data obtained on converting a signal read out from a recording medium into a bilevel signal which fails to satisfy a condition concerning a minimum run length or a maximum run length of the same symbol, the channel bit data is corrected to improve the bit error rate to secure a skew margin. To this end, channel bit data not satisfying a minimum run length d' of the same symbol is detected by a (d'-1) detector 4 using n-tupled clocks obtained on n-tupling channel clocks of playback data by a bit clock generator 2, where n is an integer not less than 2. A correction position of the channel bit data having the run length of the same symbol equal to (d'-1) is designated by a correction bit position designating unit 5. A data correction unit 6 then corrects the channel bit data so that the minimum run length of the same symbol will be equal to d'.

公开(公告)号：ID25681A

公开(公告)日：2000-10-26

申请号：ID20000302

申请日：2000-04-17

Applicant: SONY CORP

Inventor： YOSHIMURA SHUNJI ,  FUKUMOTO ATSUSHI ,  KAI SHINICHI

IPC: G11B11/10 ,  G11B11/105 ,  G11B20/10

Abstract: The recording medium consists of a displacement layer (11), a switching layer (12) and a memory layer (13) formed in this order. The memory layer is composed of a perpendicular magnetizing film; the displacement layer is composed of another perpendicular magnetizing film whose magnetic wall reluctance is relatively smaller than that of the memory layer. The switching layer is composed of a magnetic layer whose Curie temperature is lower than those of the displacement layer and the memory layer. The reproduction apparatus includes a magnetic wall displacement detector for detecting generation of the magnetic wall displacement by the use of a differential signal of the reproduced signal obtained from a signal reproducer or by the use of a difference signal in the time base direction. A data detector (159) for detects data by the use of the detection signal obtained from the magnetic wall displacement detector. An independent claim is included for a data reproducing method.

公开(公告)号：DE69729042T2

公开(公告)日：2005-04-28

申请号：DE69729042

申请日：1997-10-08

Applicant: SONY CORP

Inventor： NAKAGAWA TOSHIYUKI ,  INO HIROYUKI ,  YOSHIMURA SHUNJI ,  KAI SHINICHI ,  SHIMPUKU YOSHIHIDE ,  IIDA MICHIHIKO ,  KAWASHIMA TETSUJI ,  SATO SHOJI

IPC: G11B20/10 ,  G11B20/14 ,  H03M7/00 ,  H03M7/14 ,  H04L25/49

Abstract: If there is any portion in channel bit data obtained on converting a signal read out from a recording medium into a bilevel signal which fails to satisfy a condition concerning a minimum run length or a maximum run length of the same symbol, the channel bit data is corrected to improve the bit error rate to secure a skew margin. To this end, channel bit data not satisfying a minimum run length d' of the same symbol is detected by a (d'-1) detector 4 using n-tupled clocks obtained on n-tupling channel clocks of playback data by a bit clock generator 2, where n is an integer not less than 2. A correction position of the channel bit data having the run length of the same symbol equal to (d'-1) is designated by a correction bit position designating unit 5. A data correction unit 6 then corrects the channel bit data so that the minimum run length of the same symbol will be equal to d'.

公开(公告)号：DE60019014T2

公开(公告)日：2006-04-27

申请号：DE60019014

申请日：2000-04-17

Applicant: SONY CORP

Inventor： YOSHIMURA SHUNJI ,  FUKUMOTO ATSUSHI ,  KAI SHINICHI

IPC: G11B11/10 ,  G11B11/105 ,  G11B20/10

Abstract: The recording medium consists of a displacement layer (11), a switching layer (12) and a memory layer (13) formed in this order. The memory layer is composed of a perpendicular magnetizing film; the displacement layer is composed of another perpendicular magnetizing film whose magnetic wall reluctance is relatively smaller than that of the memory layer. The switching layer is composed of a magnetic layer whose Curie temperature is lower than those of the displacement layer and the memory layer. The reproduction apparatus includes a magnetic wall displacement detector for detecting generation of the magnetic wall displacement by the use of a differential signal of the reproduced signal obtained from a signal reproducer or by the use of a difference signal in the time base direction. A data detector (159) for detects data by the use of the detection signal obtained from the magnetic wall displacement detector. An independent claim is included for a data reproducing method.

公开(公告)号：AT292319T

公开(公告)日：2005-04-15

申请号：AT00108404

申请日：2000-04-17

Applicant: SONY CORP

Inventor： YOSHIMURA SHUNJI ,  FUKUMOTO ATSUSHI ,  KAI SHINICHI

IPC: G11B11/10 ,  G11B11/105 ,  G11B20/10

Abstract: The recording medium consists of a displacement layer (11), a switching layer (12) and a memory layer (13) formed in this order. The memory layer is composed of a perpendicular magnetizing film; the displacement layer is composed of another perpendicular magnetizing film whose magnetic wall reluctance is relatively smaller than that of the memory layer. The switching layer is composed of a magnetic layer whose Curie temperature is lower than those of the displacement layer and the memory layer. The reproduction apparatus includes a magnetic wall displacement detector for detecting generation of the magnetic wall displacement by the use of a differential signal of the reproduced signal obtained from a signal reproducer or by the use of a difference signal in the time base direction. A data detector (159) for detects data by the use of the detection signal obtained from the magnetic wall displacement detector. An independent claim is included for a data reproducing method.

公开(公告)号：BR0001668A

公开(公告)日：2000-10-31

申请号：BR0001668

申请日：2000-04-20

Applicant: SONY CORP

Inventor： YOSHIMURA SHUNJI ,  FUKUMOTO ATSUSHI ,  KAI SHINICHI

IPC: G11B11/10 ,  G11B11/105 ,  G11B20/10 ,  G11B5/02

Abstract: The recording medium consists of a displacement layer (11), a switching layer (12) and a memory layer (13) formed in this order. The memory layer is composed of a perpendicular magnetizing film; the displacement layer is composed of another perpendicular magnetizing film whose magnetic wall reluctance is relatively smaller than that of the memory layer. The switching layer is composed of a magnetic layer whose Curie temperature is lower than those of the displacement layer and the memory layer. The reproduction apparatus includes a magnetic wall displacement detector for detecting generation of the magnetic wall displacement by the use of a differential signal of the reproduced signal obtained from a signal reproducer or by the use of a difference signal in the time base direction. A data detector (159) for detects data by the use of the detection signal obtained from the magnetic wall displacement detector. An independent claim is included for a data reproducing method.