KR890015243A - 자기기록매체와 그 보안정보의 기록재생방법 - Google Patents
자기기록매체와 그 보안정보의 기록재생방법Info
- Publication number
- KR890015243A KR890015243A KR1019890003902A KR890003902A KR890015243A KR 890015243 A KR890015243 A KR 890015243A KR 1019890003902 A KR1019890003902 A KR 1019890003902A KR 890003902 A KR890003902 A KR 890003902A KR 890015243 A KR890015243 A KR 890015243A
- Authority
- KR
- South Korea
- Prior art keywords
- methods
- security information
- recording
- magnetic recording
- recording media
- Prior art date
Links
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
Applications Claiming Priority (2)
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 |
JP88-74675 | 1988-03-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR890015243A true KR890015243A (ko) | 1989-10-28 |
KR930001701B1 KR930001701B1 (ko) | 1993-03-11 |
Family
ID=13554041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019890003902A KR930001701B1 (ko) | 1988-03-30 | 1989-03-28 | 자기기록매체와 그 보안정보의 기록재생방법 |
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 |
Family Cites Families (4)
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 | ||
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 |
-
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
Also Published As
Publication number | Publication date |
---|---|
KR930001701B1 (ko) | 1993-03-11 |
JPH01248301A (ja) | 1989-10-03 |
GB8906646D0 (en) | 1989-05-04 |
AU3164689A (en) | 1989-10-05 |
GB2217096B (en) | 1992-01-22 |
SG27393G (en) | 1993-05-21 |
GB2217096A (en) | 1989-10-18 |
AU616490B2 (en) | 1991-10-31 |
HK106993A (en) | 1993-10-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
G160 | Decision to publish patent application | ||
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant | ||
FPAY | Annual fee payment |
Payment date: 20030221 Year of fee payment: 11 |
|
LAPS | Lapse due to unpaid annual fee |