DE69222335T2 - Wiedergabegerät zur Wiedergabe von Information aus einer magnetooptischen Scheibe - Google Patents
Wiedergabegerät zur Wiedergabe von Information aus einer magnetooptischen ScheibeInfo
- Publication number
- DE69222335T2 DE69222335T2 DE69222335T DE69222335T DE69222335T2 DE 69222335 T2 DE69222335 T2 DE 69222335T2 DE 69222335 T DE69222335 T DE 69222335T DE 69222335 T DE69222335 T DE 69222335T DE 69222335 T2 DE69222335 T2 DE 69222335T2
- Authority
- DE
- Germany
- Prior art keywords
- magneto
- edge detection
- detection signal
- magnetic domains
- edges
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10222—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10515—Reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/1053—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed to compensate for the magnetic domain drift or time shift
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10595—Control of operating function
- G11B11/10597—Adaptations for transducing various formats on the same or different carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B20/1217—Formatting, e.g. arrangement of data block or words on the record carriers on discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
- G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
- G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2525—Magneto-optical [MO] discs
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP05732891A JP3556233B2 (ja) | 1991-03-20 | 1991-03-20 | 光磁気ディスクの再生方式 |
JP3136405A JPH04360048A (ja) | 1991-06-07 | 1991-06-07 | 光磁気ディスクの再生方法及び装置 |
JP3275713A JP2664302B2 (ja) | 1991-10-23 | 1991-10-23 | 光磁気ディスク再生装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
DE69222335D1 DE69222335D1 (de) | 1997-10-30 |
DE69222335T2 true DE69222335T2 (de) | 1998-01-29 |
Family
ID=27296215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69222335T Expired - Fee Related DE69222335T2 (de) | 1991-03-20 | 1992-03-16 | Wiedergabegerät zur Wiedergabe von Information aus einer magnetooptischen Scheibe |
Country Status (5)
Country | Link |
---|---|
US (1) | US5235590A (de) |
EP (1) | EP0505253B1 (de) |
KR (1) | KR950010327B1 (de) |
CA (1) | CA2063189C (de) |
DE (1) | DE69222335T2 (de) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05225638A (ja) * | 1992-02-10 | 1993-09-03 | Sony Corp | 光磁気ディスク再生装置 |
JP2618571B2 (ja) * | 1992-09-24 | 1997-06-11 | 富士通株式会社 | 光磁気ディスクのデータ再生回路 |
US5490126A (en) * | 1993-04-07 | 1996-02-06 | Matsushita Electric Industrial Co., Ltd. | Apparatus for recording and reproducing data on a disk |
JPH06302042A (ja) * | 1993-04-15 | 1994-10-28 | Hitachi Ltd | 光磁気ディスク装置 |
JPH07182705A (ja) * | 1993-12-21 | 1995-07-21 | Fujitsu Ltd | 光磁気媒体及びその再生装置 |
US6384996B1 (en) * | 1994-10-31 | 2002-05-07 | Samsung Electronics Co., Ltd. | Insertion of ones and zeroes into I-NRZI modulation for magnetic recording apparatus to facilitate head tracking |
US5502711A (en) * | 1995-03-20 | 1996-03-26 | International Business Machines Corporation | Dual digital phase locked loop clock channel for optical recording |
US5930216A (en) * | 1996-04-19 | 1999-07-27 | Asahi Kasei Microsystems Co., Ltd. | Clock combining circuit |
US5835542A (en) * | 1996-07-19 | 1998-11-10 | Utek Semiconductor Corporation | Digital data separator for separating data signals from clock signals in an encoded data stream |
JP2919380B2 (ja) * | 1996-08-29 | 1999-07-12 | 山形日本電気株式会社 | ディスク回転速度制御回路 |
US5966356A (en) * | 1996-11-11 | 1999-10-12 | Konica Corporation | Optimum slice level signal reading apparatus for optical disk |
WO2000042609A1 (fr) * | 1999-01-18 | 2000-07-20 | Fujitsu Limited | Procede et dispositif de commande de signal reproduit |
WO2003015268A2 (en) * | 2001-08-03 | 2003-02-20 | Koninklijke Philips Electronics N.V. | Analog fir-filter |
US7272201B2 (en) * | 2003-08-20 | 2007-09-18 | Schweitzer Engineering Laboratories, Inc. | System for synchronous sampling and time-of-day clocking using an encoded time signal |
US7398411B2 (en) * | 2005-05-12 | 2008-07-08 | Schweitzer Engineering Laboratories, Inc. | Self-calibrating time code generator |
BRPI1013707A2 (pt) * | 2009-04-03 | 2019-09-24 | Schweitzer Eng Laboratoires Inc | métodos de correção de deriva de sinal de tempo para um dispositivo eletrônico inteligente, para determinar em sinal de tempo médio ponderado, dispositivo eletrônico inteligente (ied), e, método para determinar e distribuir um sinal de tempo médio ponderado em um sistema de distribuição de potência elétrica. |
US8351433B2 (en) * | 2009-09-18 | 2013-01-08 | Schweitzer Engineering Laboratories Inc | Intelligent electronic device with segregated real-time ethernet |
US8867345B2 (en) * | 2009-09-18 | 2014-10-21 | Schweitzer Engineering Laboratories, Inc. | Intelligent electronic device with segregated real-time ethernet |
US8812256B2 (en) | 2011-01-12 | 2014-08-19 | Schweitzer Engineering Laboratories, Inc. | System and apparatus for measuring the accuracy of a backup time source |
US9324122B2 (en) | 2012-10-19 | 2016-04-26 | Schweitzer Engineering Laboratories, Inc. | Voting scheme for time alignment |
US9300591B2 (en) | 2013-01-28 | 2016-03-29 | Schweitzer Engineering Laboratories, Inc. | Network device |
US9620955B2 (en) | 2013-03-15 | 2017-04-11 | Schweitzer Engineering Laboratories, Inc. | Systems and methods for communicating data state change information between devices in an electrical power system |
US9065763B2 (en) | 2013-03-15 | 2015-06-23 | Schweitzer Engineering Laboratories, Inc. | Transmission of data over a low-bandwidth communication channel |
US9270109B2 (en) | 2013-03-15 | 2016-02-23 | Schweitzer Engineering Laboratories, Inc. | Exchange of messages between devices in an electrical power system |
US9967135B2 (en) | 2016-03-29 | 2018-05-08 | Schweitzer Engineering Laboratories, Inc. | Communication link monitoring and failover |
US10819727B2 (en) | 2018-10-15 | 2020-10-27 | Schweitzer Engineering Laboratories, Inc. | Detecting and deterring network attacks |
US11522358B2 (en) | 2020-05-18 | 2022-12-06 | Schweitzer Engineering Laboratories, Inc. | Isolation of protective functions in electrical power systems |
US11862958B2 (en) | 2021-10-04 | 2024-01-02 | Schweitzer Engineering Laboratories, Inc. | Isolation of protection functions in electrical power systems during startup |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4646103A (en) * | 1985-03-20 | 1987-02-24 | Hitachi, Ltd. | Optical recording method |
JP2607462B2 (ja) * | 1985-03-20 | 1997-05-07 | 株式会社日立製作所 | 情報再生方法及び装置 |
JPH0721897B2 (ja) * | 1986-04-24 | 1995-03-08 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | 光磁気データ記録装置 |
JP2810035B2 (ja) * | 1986-08-22 | 1998-10-15 | 株式会社日立製作所 | 光学的記録再生方法 |
KR910003460B1 (ko) * | 1987-02-12 | 1991-05-31 | 가부시기가이샤 히다찌세이사꾸쇼 | 광학식 정보기록 장치 |
US4866691A (en) * | 1987-03-13 | 1989-09-12 | Pioneer Electronic Corporation | AC amplifying RF signal processing circuit for optical disk player |
JPH073710B2 (ja) * | 1987-06-17 | 1995-01-18 | 日本電気株式会社 | 光磁気ディスク装置 |
-
1992
- 1992-03-13 US US07/851,537 patent/US5235590A/en not_active Expired - Lifetime
- 1992-03-16 EP EP92400687A patent/EP0505253B1/de not_active Expired - Lifetime
- 1992-03-16 DE DE69222335T patent/DE69222335T2/de not_active Expired - Fee Related
- 1992-03-17 CA CA002063189A patent/CA2063189C/en not_active Expired - Fee Related
- 1992-03-19 KR KR1019920004515A patent/KR950010327B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0505253A2 (de) | 1992-09-23 |
CA2063189C (en) | 1996-01-02 |
CA2063189A1 (en) | 1992-09-21 |
DE69222335D1 (de) | 1997-10-30 |
EP0505253A3 (en) | 1993-01-13 |
KR950010327B1 (ko) | 1995-09-14 |
US5235590A (en) | 1993-08-10 |
KR920018680A (ko) | 1992-10-22 |
EP0505253B1 (de) | 1997-09-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |