JPS6472088A - Method and apparatus for discovering and evaluating defect of recording carrier by digital signal recorded on at least one track - Google Patents

Method and apparatus for discovering and evaluating defect of recording carrier by digital signal recorded on at least one track

Info

Publication number
JPS6472088A
JPS6472088A JP63203327A JP20332788A JPS6472088A JP S6472088 A JPS6472088 A JP S6472088A JP 63203327 A JP63203327 A JP 63203327A JP 20332788 A JP20332788 A JP 20332788A JP S6472088 A JPS6472088 A JP S6472088A
Authority
JP
Japan
Prior art keywords
signals
dropout
defect
gradient
signal
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.)
Granted
Application number
JP63203327A
Other languages
English (en)
Other versions
JPH041402B2 (ja
Inventor
Fueraizen Peetaa
Kuruuku Ariberuto
Guroosuhansu Peetaa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of JPS6472088A publication Critical patent/JPS6472088A/ja
Publication of JPH041402B2 publication Critical patent/JPH041402B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Digital Magnetic Recording (AREA)
  • Measuring Magnetic Variables (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
JP63203327A 1982-10-14 1988-08-17 Method and apparatus for discovering and evaluating defect of recording carrier by digital signal recorded on at least one track Granted JPS6472088A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823238077 DE3238077A1 (de) 1982-10-14 1982-10-14 Verfahren und schaltungsanordnungen zum auffinden und auswerten von fehlstellen auf aufzeichnungstraegern mit in wenigstens einer spur aufgezeichneten digitalsignalen

Publications (2)

Publication Number Publication Date
JPS6472088A true JPS6472088A (en) 1989-03-16
JPH041402B2 JPH041402B2 (ja) 1992-01-13

Family

ID=6175693

Family Applications (2)

Application Number Title Priority Date Filing Date
JP58189439A Granted JPS59104713A (ja) 1982-10-14 1983-10-12 少なくとも１つのトラックに記録されたデジタル信号により記録担体の欠陥を発見しかつ評価する方法及び装置
JP63203327A Granted JPS6472088A (en) 1982-10-14 1988-08-17 Method and apparatus for discovering and evaluating defect of recording carrier by digital signal recorded on at least one track

Family Applications Before (1)

Application Number Title Priority Date Filing Date
JP58189439A Granted JPS59104713A (ja) 1982-10-14 1983-10-12 少なくとも１つのトラックに記録されたデジタル信号により記録担体の欠陥を発見しかつ評価する方法及び装置

Country Status (4)

Country Link
US (2) US4656420A (ja)
JP (2) JPS59104713A (ja)
DE (1) DE3238077A1 (ja)
GB (1) GB2131220B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03296931A (ja) * 1990-04-17 1991-12-27 Canon Inc 情報記録媒体検査装置

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0734294B2 (ja) * 1985-11-08 1995-04-12 株式会社日立製作所 記録媒体の欠陥検出方法及び欠陥検出装置
JPS62185178A (ja) * 1986-02-12 1987-08-13 Fuji Photo Film Co Ltd デイスク検査方法
US4729045A (en) * 1986-04-01 1988-03-01 Hewlett-Packard Company Apparatus and method for digital magnetic recording and reading
JPS63234451A (ja) * 1987-03-20 1988-09-29 Pioneer Electronic Corp ドロツプアウト検出回路
US5031054A (en) * 1988-09-26 1991-07-09 Digital Equipment Corporation In-drive defect detector
US5047874A (en) * 1989-03-31 1991-09-10 Unisys Corp. Technique for certifying disk recording surface
US5168412A (en) * 1989-06-28 1992-12-01 Toan Doan Surface interference detector
US5087884A (en) * 1990-06-28 1992-02-11 Vtc Bipolar Corporation Open head detection circuit and method
US5121057A (en) * 1990-12-21 1992-06-09 Maxtor Corporation Media flaw detection apparatus for a magnetic disk drive with squaring and summing of in-phase and quadrature-phase detected signals
US5247254A (en) * 1990-12-21 1993-09-21 Maxtor Corporation Data recording system incorporating flaw detection circuitry
US5333140A (en) * 1991-10-03 1994-07-26 Helios Incorporated Servowriter/certifier
JP2793735B2 (ja) * 1992-02-18 1998-09-03 富士通株式会社 磁気ディスク媒体の欠陥検出方法
JPH06231455A (ja) * 1993-01-29 1994-08-19 Otari Kk 記録媒体検査装置
US5615223A (en) * 1995-04-19 1997-03-25 Eastman Kodak Company PPM decoder utilizing drop-out location information
US5627846A (en) * 1995-04-19 1997-05-06 Eastman Kodak Company Drop-out location detection circuit
US5949597A (en) * 1996-04-24 1999-09-07 Tandberg Data Storage A/S Method and apparatus for data pulse qualification wherein the amplitude of a preceding pulse of opposite polarity is tracked
US6292317B1 (en) * 1999-09-02 2001-09-18 Maxtor Corporation Method and apparatus for performing a flaw scan of a disk drive
US7768736B2 (en) * 2007-03-30 2010-08-03 Seagate Technology Llc Certifying while servowriting media

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185922A (en) * 1961-02-24 1965-05-25 Don M Wherry Device for determining the reproduction characteristics of a magnetic recording medium
NL295540A (ja) * 1963-07-09
US3288586A (en) * 1963-11-07 1966-11-29 Du Pont Herbicidal methods employing an addition compound of 3-(3, 4-dichlorophenyl)-1-methyl-1-methoxyurea and dodecylbenzenesulfonic acid
US3525930A (en) * 1968-03-28 1970-08-25 Minnesota Mining & Mfg Dropout counter
US3522525A (en) * 1968-07-15 1970-08-04 Us Navy Automatic magnetic tape dropout evaluator
NL6812449A (ja) * 1968-08-31 1970-03-03
US3562635A (en) * 1968-10-16 1971-02-09 Ibm Apparatus and method for detecting defects in magnetic tape
JPS534407B1 (ja) * 1970-12-25 1978-02-17
US3659185A (en) * 1971-06-10 1972-04-25 Collins Radio Co Volt-second unbalanced compensated two core power transformer
US3826975A (en) * 1973-08-29 1974-07-30 Us Commerce Universal dropout tester for magnetic storage media
AT337270B (de) * 1975-07-10 1977-06-27 Philips Nv Schaltungsanordnung fur einen dropout-detektor
US4146099A (en) * 1976-08-17 1979-03-27 Christopher Scientific Company Signal recording method and apparatus
JPS5746306A (en) * 1980-09-03 1982-03-16 Hitachi Ltd Aural signal muting circuit of magnetic recorder and reproducer
JPS5817508A (ja) * 1981-07-23 1983-02-01 Victor Co Of Japan Ltd 信号レベルの検出方式

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03296931A (ja) * 1990-04-17 1991-12-27 Canon Inc 情報記録媒体検査装置

Also Published As

Publication number Publication date
GB2131220A (en) 1984-06-13
DE3238077A1 (de) 1984-04-19
JPH041402B2 (ja) 1992-01-13
GB2131220B (en) 1986-09-10
JPS59104713A (ja) 1984-06-16
US4656420A (en) 1987-04-07
JPS6412029B2 (ja) 1989-02-28
US4754222A (en) 1988-06-28
DE3238077C2 (ja) 1989-08-24
GB8327425D0 (en) 1983-11-16

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