JP4695814B2 - データ復号方法・回路及びこれを用いた情報記録再生装置 - Google Patents

データ復号方法・回路及びこれを用いた情報記録再生装置 Download PDF

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Publication number
JP4695814B2
JP4695814B2 JP2002031860A JP2002031860A JP4695814B2 JP 4695814 B2 JP4695814 B2 JP 4695814B2 JP 2002031860 A JP2002031860 A JP 2002031860A JP 2002031860 A JP2002031860 A JP 2002031860A JP 4695814 B2 JP4695814 B2 JP 4695814B2
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Prior art keywords
code
sequence
circuit
likelihood
value
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JP2002031860A
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Japanese (ja)
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JP2003233954A (ja
JP2003233954A5 (enExample
Inventor
秀樹 澤口
靖孝 西田
正文 望月
浩之 土永
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株式会社日立グローバルストレージテクノロジーズ
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Priority to JP2002031860A priority Critical patent/JP4695814B2/ja
Priority to US10/206,211 priority patent/US7024617B2/en
Publication of JP2003233954A publication Critical patent/JP2003233954A/ja
Publication of JP2003233954A5 publication Critical patent/JP2003233954A5/ja
Priority to US11/339,574 priority patent/US7213195B2/en
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Publication of JP4695814B2 publication Critical patent/JP4695814B2/ja
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    • 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
    • G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
    • G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
    • 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
    • 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
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Error Detection And Correction (AREA)
JP2002031860A 2002-02-08 2002-02-08 データ復号方法・回路及びこれを用いた情報記録再生装置 Expired - Fee Related JP4695814B2 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2002031860A JP4695814B2 (ja) 2002-02-08 2002-02-08 データ復号方法・回路及びこれを用いた情報記録再生装置
US10/206,211 US7024617B2 (en) 2002-02-08 2002-07-29 Data decoding method and circuit and information recording and reproducing apparatus using the same
US11/339,574 US7213195B2 (en) 2002-02-08 2006-01-26 Data decoding method and circuit and information recording and reproducing apparatus using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002031860A JP4695814B2 (ja) 2002-02-08 2002-02-08 データ復号方法・回路及びこれを用いた情報記録再生装置

Publications (3)

Publication Number Publication Date
JP2003233954A JP2003233954A (ja) 2003-08-22
JP2003233954A5 JP2003233954A5 (enExample) 2005-08-25
JP4695814B2 true JP4695814B2 (ja) 2011-06-08

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JP2002031860A Expired - Fee Related JP4695814B2 (ja) 2002-02-08 2002-02-08 データ復号方法・回路及びこれを用いた情報記録再生装置

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US (2) US7024617B2 (enExample)
JP (1) JP4695814B2 (enExample)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4324316B2 (ja) * 2000-10-23 2009-09-02 株式会社日立グローバルストレージテクノロジーズ 垂直磁気記録再生装置
US7113356B1 (en) 2002-09-10 2006-09-26 Marvell International Ltd. Method for checking the quality of servo gray codes
US7038869B2 (en) * 2003-04-14 2006-05-02 Matsushita Electric Industrial Co., Ltd. Recording control apparatus, recording and reproduction apparatus, and recording control method
US7499233B1 (en) * 2004-04-20 2009-03-03 Marvell International Ltd. Multi-phase control information detection and signal polarity determination
JP2005332437A (ja) * 2004-05-18 2005-12-02 Canon Inc 再生信号評価方法及び情報記録再生装置
JP4751131B2 (ja) * 2005-08-18 2011-08-17 東芝ストレージデバイス株式会社 媒体記憶装置のデータ消失防止方法及び媒体記憶装置
JP4249165B2 (ja) * 2005-08-18 2009-04-02 富士通株式会社 媒体記憶装置のデータ消失防止方法及び媒体記憶装置
US7545594B2 (en) * 2006-05-26 2009-06-09 Imation Corp. Method and system for removing signal defects in MR head signals
JP2009118190A (ja) * 2007-11-06 2009-05-28 Canon Inc 画像形成装置、解析方法、及びコンピュータプログラム
US8677221B2 (en) * 2008-01-02 2014-03-18 Apple Inc. Partial voltage read of memory
US9082457B2 (en) 2013-05-23 2015-07-14 Kabushiki Kaisha Toshiba Data decoding control apparatus, data storage apparatus and data decoding method
US9130599B2 (en) * 2013-12-24 2015-09-08 Avago Technologies General Ip (Singapore) Pte. Ltd. Systems and methods of converting detector output to multi-level soft information
US10482918B1 (en) * 2018-08-17 2019-11-19 Seagate Technology Llc Changing bit spacing for selected symbols written to a magnetic recording medium
US11293982B2 (en) * 2019-03-07 2022-04-05 Rohde & Schwarz Gmbh & Co. Kg Test method and test system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58219852A (ja) * 1982-06-15 1983-12-21 Toshiba Corp エラ−訂正回路
US5602858A (en) * 1993-09-20 1997-02-11 Kabushiki Kaisha Toshiba Digital signal decoding apparatus having a plurality of correlation tables and a method thereof
US5889823A (en) * 1995-12-13 1999-03-30 Lucent Technologies Inc. Method and apparatus for compensation of linear or nonlinear intersymbol interference and noise correlation in magnetic recording channels
US6023783A (en) * 1996-05-15 2000-02-08 California Institute Of Technology Hybrid concatenated codes and iterative decoding
FR2751810B1 (fr) * 1996-07-23 1998-10-23 Sgs Thomson Microelectronics Systeme de correction d'erreurs dans des trames de donnees ayant des codes de parite horizontaux et verticaux
US6009552A (en) * 1997-06-18 1999-12-28 Motorola, Inc. Soft-decision syndrome-based decoder for convolutional codes
US6097320A (en) * 1998-01-20 2000-08-01 Silicon Systems, Inc. Encoder/decoder system with suppressed error propagation
JP4058153B2 (ja) * 1998-02-25 2008-03-05 株式会社日立グローバルストレージテクノロジーズ 符号化方法およびそれを用いた記録再生装置
US20030152175A1 (en) * 1999-01-13 2003-08-14 Ryohei Kuki Post-processor using a noise whitened matched filter for a mass data storage device, or the like

Also Published As

Publication number Publication date
JP2003233954A (ja) 2003-08-22
US7024617B2 (en) 2006-04-04
US20030151838A1 (en) 2003-08-14
US20060156208A1 (en) 2006-07-13
US7213195B2 (en) 2007-05-01

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