GB2148670B - A high density code for coded recording of data and recording and reading apparatus therefor - Google Patents
A high density code for coded recording of data and recording and reading apparatus thereforInfo
- Publication number
- GB2148670B GB2148670B GB08423669A GB8423669A GB2148670B GB 2148670 B GB2148670 B GB 2148670B GB 08423669 A GB08423669 A GB 08423669A GB 8423669 A GB8423669 A GB 8423669A GB 2148670 B GB2148670 B GB 2148670B
- Authority
- GB
- United Kingdom
- Prior art keywords
- recording
- data
- high density
- reading apparatus
- apparatus therefor
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24085—Pits
-
- 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
- G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/013—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track for discrete information, i.e. where each information unit is stored in a distinct discrete location, e.g. digital information formats within a data block or sector
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Optical Recording Or Reproduction (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US54175383A | 1983-10-13 | 1983-10-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8423669D0 GB8423669D0 (en) | 1984-10-24 |
GB2148670A GB2148670A (en) | 1985-05-30 |
GB2148670B true GB2148670B (en) | 1987-07-08 |
Family
ID=24160893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08423669A Expired GB2148670B (en) | 1983-10-13 | 1984-09-19 | A high density code for coded recording of data and recording and reading apparatus therefor |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPH0721941B2 (en) |
AU (1) | AU574722B2 (en) |
CA (1) | CA1229164A (en) |
DE (1) | DE3416547C2 (en) |
FR (1) | FR2557344B1 (en) |
GB (1) | GB2148670B (en) |
NL (1) | NL8403044A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60231980A (en) * | 1983-12-29 | 1985-11-18 | レーザー マグネテイツク ストーリツジ インターナシヨナル コンパニー | High-density code for optical recording |
US4881076A (en) * | 1987-12-01 | 1989-11-14 | International Business Machines Corporation | Encoding for pit-per-transition optical data recording |
JPH06325369A (en) * | 1993-03-08 | 1994-11-25 | Philips Electron Nv | Combined optical recording and reading device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1122711A (en) * | 1976-07-14 | 1982-04-27 | Sperry Rand Corporation | Method and apparatus for encoding and recovering binary digital data |
JPS55141852A (en) * | 1979-04-24 | 1980-11-06 | Sony Corp | Data converting system |
NL8006165A (en) * | 1980-11-12 | 1982-06-01 | Philips Nv | SYSTEM FOR TRANSFER OF DIGITAL INFORMATION, CODER FOR APPLICATION IN THAT SYSTEM, DECODER FOR APPLICATION IN THAT SYSTEM AND RECORD CARRIAGE FOR APPLICATION IN THAT SYSTEM. |
US4377805A (en) * | 1981-04-20 | 1983-03-22 | Emi Limited | Magnetic recording |
FR2507035B1 (en) * | 1981-06-02 | 1988-09-16 | Thomson Csf | BINARY DATA CODING METHOD AND DIGITAL VIDEO SIGNAL TRANSMISSION DEVICE IMPLEMENTING SUCH A METHOD |
JPS5846751A (en) * | 1981-09-11 | 1983-03-18 | Sony Corp | Binary code modulating method and recording medium and its reproducer |
-
1984
- 1984-05-04 DE DE19843416547 patent/DE3416547C2/en not_active Expired - Fee Related
- 1984-06-12 JP JP12063484A patent/JPH0721941B2/en not_active Expired - Lifetime
- 1984-07-13 CA CA000458854A patent/CA1229164A/en not_active Expired
- 1984-09-19 GB GB08423669A patent/GB2148670B/en not_active Expired
- 1984-10-03 AU AU33789/84A patent/AU574722B2/en not_active Ceased
- 1984-10-05 NL NL8403044A patent/NL8403044A/en not_active Application Discontinuation
- 1984-10-12 FR FR8415717A patent/FR2557344B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE3416547A1 (en) | 1986-01-09 |
FR2557344B1 (en) | 1989-01-06 |
JPS6083225A (en) | 1985-05-11 |
GB2148670A (en) | 1985-05-30 |
AU3378984A (en) | 1985-04-18 |
AU574722B2 (en) | 1988-07-14 |
CA1229164A (en) | 1987-11-10 |
FR2557344A1 (en) | 1985-06-28 |
GB8423669D0 (en) | 1984-10-24 |
DE3416547C2 (en) | 1994-10-06 |
NL8403044A (en) | 1985-05-01 |
JPH0721941B2 (en) | 1995-03-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960919 |