DE3238077C2 - - Google Patents
Info
- Publication number
- DE3238077C2 DE3238077C2 DE3238077A DE3238077A DE3238077C2 DE 3238077 C2 DE3238077 C2 DE 3238077C2 DE 3238077 A DE3238077 A DE 3238077A DE 3238077 A DE3238077 A DE 3238077A DE 3238077 C2 DE3238077 C2 DE 3238077C2
- Authority
- DE
- Germany
- Prior art keywords
- detector
- threshold
- drop
- signal
- read
- 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
Links
- 238000000034 method Methods 0.000 claims description 22
- 238000011156 evaluation Methods 0.000 claims description 15
- 230000007547 defect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 239000000969 carrier Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 235000021251 pulses Nutrition 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 238000010998 test method Methods 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- LZDYZEGISBDSDP-UHFFFAOYSA-N 2-(1-ethylaziridin-1-ium-1-yl)ethanol Chemical compound OCC[N+]1(CC)CC1 LZDYZEGISBDSDP-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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)
Priority Applications (6)
| 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 |
| US06/540,385 US4656420A (en) | 1982-10-14 | 1983-10-11 | Method and circuit arrangements for detecting and evaluating faults in recording media having digital signals recorded on one or more tracks |
| JP58189439A 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 |
| GB08327425A GB2131220B (en) | 1982-10-14 | 1983-10-13 | Method and circuit arrangements for detecting and evaluating faults in recording media having digital signals recorded on one or more tracks |
| US06/947,178 US4754222A (en) | 1982-10-14 | 1986-12-29 | Method for detecting and evaluating dropouts in recording media having digital signals recorded thereon |
| JP63203327A 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 |
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 |
|---|---|
| DE3238077A1 DE3238077A1 (de) | 1984-04-19 |
| DE3238077C2 true DE3238077C2 (OSRAM) | 1989-08-24 |
Family
ID=6175693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19823238077 Granted 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 |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US4656420A (OSRAM) |
| JP (2) | JPS59104713A (OSRAM) |
| DE (1) | DE3238077A1 (OSRAM) |
| GB (1) | GB2131220B (OSRAM) |
Families Citing this family (19)
| 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 |
| JPH03296931A (ja) * | 1990-04-17 | 1991-12-27 | Canon Inc | 情報記録媒体検査装置 |
| 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 |
| US7880987B2 (en) * | 2007-03-30 | 2011-02-01 | Seagate Technology Llc | Media servowriter/certifier |
Family Cites Families (14)
| 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 (OSRAM) * | 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 (OSRAM) * | 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 (OSRAM) * | 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 |
-
1982
- 1982-10-14 DE DE19823238077 patent/DE3238077A1/de active Granted
-
1983
- 1983-10-11 US US06/540,385 patent/US4656420A/en not_active Expired - Fee Related
- 1983-10-12 JP JP58189439A patent/JPS59104713A/ja active Granted
- 1983-10-13 GB GB08327425A patent/GB2131220B/en not_active Expired
-
1986
- 1986-12-29 US US06/947,178 patent/US4754222A/en not_active Expired - Fee Related
-
1988
- 1988-08-17 JP JP63203327A patent/JPS6472088A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| US4754222A (en) | 1988-06-28 |
| US4656420A (en) | 1987-04-07 |
| GB2131220A (en) | 1984-06-13 |
| GB8327425D0 (en) | 1983-11-16 |
| GB2131220B (en) | 1986-09-10 |
| JPS6472088A (en) | 1989-03-16 |
| JPH041402B2 (OSRAM) | 1992-01-13 |
| DE3238077A1 (de) | 1984-04-19 |
| JPS59104713A (ja) | 1984-06-16 |
| JPS6412029B2 (OSRAM) | 1989-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8339 | Ceased/non-payment of the annual fee |