JPH01248301A - 磁気記録媒体およびそのセキュリティ情報の記録再生方法 - Google Patents
磁気記録媒体およびそのセキュリティ情報の記録再生方法Info
- Publication number
- JPH01248301A JPH01248301A JP63074675A JP7467588A JPH01248301A JP H01248301 A JPH01248301 A JP H01248301A JP 63074675 A JP63074675 A JP 63074675A JP 7467588 A JP7467588 A JP 7467588A JP H01248301 A JPH01248301 A JP H01248301A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- information
- security information
- recording
- polarity
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 23
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 230000005415 magnetization Effects 0.000 claims description 10
- 230000004069 differentiation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
- G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
- G07F7/086—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means by passive credit-cards adapted therefor, e.g. constructive particularities to avoid counterfeiting, e.g. by inclusion of a physical or chemical security-layer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
- G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
- G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
- G06K7/084—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
-
- 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
- G11B20/1407—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol
- G11B20/1419—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Security & Cryptography (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Digital Magnetic Recording (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63074675A JPH01248301A (ja) | 1988-03-30 | 1988-03-30 | 磁気記録媒体およびそのセキュリティ情報の記録再生方法 |
GB8906646A GB2217096B (en) | 1988-03-30 | 1989-03-22 | Magnetic record medium and method of recording and reproducing security information on and from it |
AU31646/89A AU616490B2 (en) | 1988-03-30 | 1989-03-23 | Magnetic record medium and method of recording and reproducing security information on and from the same |
KR1019890003902A KR930001701B1 (ko) | 1988-03-30 | 1989-03-28 | 자기기록매체와 그 보안정보의 기록재생방법 |
SG273/93A SG27393G (en) | 1988-03-30 | 1993-03-15 | Magnetic record medium and method of recording and reproducing security information on and from it |
HK1069/93A HK106993A (en) | 1988-03-30 | 1993-10-14 | Magnetic record medium and method of recording and reproducing security information on and from it |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63074675A JPH01248301A (ja) | 1988-03-30 | 1988-03-30 | 磁気記録媒体およびそのセキュリティ情報の記録再生方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01248301A true JPH01248301A (ja) | 1989-10-03 |
Family
ID=13554041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63074675A Pending JPH01248301A (ja) | 1988-03-30 | 1988-03-30 | 磁気記録媒体およびそのセキュリティ情報の記録再生方法 |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPH01248301A (ko) |
KR (1) | KR930001701B1 (ko) |
AU (1) | AU616490B2 (ko) |
GB (1) | GB2217096B (ko) |
HK (1) | HK106993A (ko) |
SG (1) | SG27393G (ko) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2367182B (en) | 2000-09-20 | 2004-05-26 | Hewlett Packard Co | Improvements in and relating to data protection |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5942617A (ja) * | 1982-08-31 | 1984-03-09 | Sansui Electric Co | 磁気記録再生方式 |
JPS5960713A (ja) * | 1982-09-30 | 1984-04-06 | Sansui Electric Co | 磁気記録再生方式 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4219851A (en) * | 1978-11-24 | 1980-08-26 | Honeywell Information Systems Inc. | Group coded recording data recovery system |
JPS6343625Y2 (ko) * | 1979-06-06 | 1988-11-14 |
-
1988
- 1988-03-30 JP JP63074675A patent/JPH01248301A/ja active Pending
-
1989
- 1989-03-22 GB GB8906646A patent/GB2217096B/en not_active Expired - Lifetime
- 1989-03-23 AU AU31646/89A patent/AU616490B2/en not_active Ceased
- 1989-03-28 KR KR1019890003902A patent/KR930001701B1/ko not_active IP Right Cessation
-
1993
- 1993-03-15 SG SG273/93A patent/SG27393G/en unknown
- 1993-10-14 HK HK1069/93A patent/HK106993A/xx not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5942617A (ja) * | 1982-08-31 | 1984-03-09 | Sansui Electric Co | 磁気記録再生方式 |
JPS5960713A (ja) * | 1982-09-30 | 1984-04-06 | Sansui Electric Co | 磁気記録再生方式 |
Also Published As
Publication number | Publication date |
---|---|
SG27393G (en) | 1993-05-21 |
AU3164689A (en) | 1989-10-05 |
HK106993A (en) | 1993-10-22 |
AU616490B2 (en) | 1991-10-31 |
GB2217096B (en) | 1992-01-22 |
GB2217096A (en) | 1989-10-18 |
GB8906646D0 (en) | 1989-05-04 |
KR930001701B1 (ko) | 1993-03-11 |
KR890015243A (ko) | 1989-10-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPH01248301A (ja) | 磁気記録媒体およびそのセキュリティ情報の記録再生方法 | |
JPS63191370A (ja) | カ−ド状記録媒体へのデ−タ記録方法 | |
JP3291047B2 (ja) | 光磁気ディスク再生装置 | |
JPS6289201A (ja) | 磁気記録再生装置 | |
JP2958667B2 (ja) | 高密度磁気記録読取方式 | |
JPS6339138A (ja) | レーザーパワー制御方法 | |
KR930011378B1 (ko) | 3진데이타의 기록재생방법 | |
US4050012A (en) | Dual biased static sensing magnetic transducer | |
JPS5829110A (ja) | デイジタル信号の磁気記録方法 | |
JP2540953B2 (ja) | 垂直磁気記録方法 | |
JP2632323B2 (ja) | 垂直磁気記録方式 | |
JP2823664B2 (ja) | 高密度磁気記録方法 | |
JP2872207B1 (ja) | 磁気記録方法及び磁気記録再生装置 | |
JP2655064B2 (ja) | 光磁気ディスクの信号検出方法 | |
JPH03102639A (ja) | 情報記録再生装置 | |
JPH025222A (ja) | 光メモリ装置 | |
JP3294278B2 (ja) | 磁気信号再生装置 | |
JPH0638282B2 (ja) | デジタル磁気記録情報の再生方式 | |
JPH0765379A (ja) | 情報記録装置 | |
JPH04286701A (ja) | 磁気記録再生装置 | |
JP2001195702A (ja) | 情報記録方法、情報記録の再生方法および情報記録媒体 | |
JPH0719338B2 (ja) | 磁気記録再生方式 | |
JPH0312006A (ja) | 光磁気オーバライト方式 | |
JPS62173625A (ja) | 光デイスク記録再生装置 | |
JPH01320611A (ja) | 垂直磁気記録方法 |