GB2016178A - Data processing apparatus - Google Patents
Data processing apparatusInfo
- Publication number
- GB2016178A GB2016178A GB7907745A GB7907745A GB2016178A GB 2016178 A GB2016178 A GB 2016178A GB 7907745 A GB7907745 A GB 7907745A GB 7907745 A GB7907745 A GB 7907745A GB 2016178 A GB2016178 A GB 2016178A
- Authority
- GB
- United Kingdom
- Prior art keywords
- error
- syndromes
- channels
- channel
- parity checks
- 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
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
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1833—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Error Detection And Correction (AREA)
- Detection And Correction Of Errors (AREA)
Abstract
Data processing apparatus can simultaneously correct data in several channels in error in an advantageous manner. The apparatus encodes and records vertical parity checks in a first channel and encodes and records parity checks in second and third channels, or equivalent taken over the channels, in respective predetermined positively and negatively sloped directions. Upon readback, syndromes from the parity checks and the recorded data are obtained. Correction signals from at least two syndromes intersecting the same error in a known channel in error are formed. The values of the syndromes diagonally intersecting errors in the known channel are continuously modified as the errors are detected by inversion of the simple parity. Correction is attained by logically combining the correction signals with the original data of the known channel in error. Internal pointers to either first or subsequent channels in error are generated as a function of the bit position displacement in the in-channel direction between the occurrence of first and subsequent mismatches of vertical and diagonal syndromes. Internal pointers are generated either in the absence of or to supplement any external pointers.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/884,463 US4205324A (en) | 1977-12-23 | 1978-03-07 | Methods and means for simultaneously correcting several channels in error in a parallel multi channel data system using continuously modifiable syndromes and selective generation of internal channel pointers |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2016178A true GB2016178A (en) | 1979-09-19 |
GB2016178B GB2016178B (en) | 1982-05-06 |
Family
ID=25384679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7907745A Expired GB2016178B (en) | 1978-03-07 | 1979-03-05 | Data processing apparatus |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPS54118748A (en) |
DE (1) | DE2908373A1 (en) |
FR (1) | FR2419543B1 (en) |
GB (1) | GB2016178B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2137456A (en) * | 1983-03-04 | 1984-10-03 | Radyne Corp | Carrier data transmission system with error correcting data encoding |
GB2149156A (en) * | 1983-11-04 | 1985-06-05 | Gen Electric Co Plc | A method of encoding and decoding |
WO1989006426A1 (en) * | 1988-01-05 | 1989-07-13 | Digital Equipment Corporation | Stored data error correction system |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3040004A1 (en) * | 1979-10-24 | 1981-05-07 | Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka | METHOD AND DEVICE FOR CODING CHECK WORDS OF LOW REDUNDANCY FROM ORIGIN DATA |
JPS57183609A (en) * | 1981-05-07 | 1982-11-12 | Victor Co Of Japan Ltd | Magnetic recording system of digital signal |
JPH07107781B2 (en) * | 1986-02-24 | 1995-11-15 | 松下電器産業株式会社 | RAM address signal generation circuit |
JP2003317400A (en) * | 2003-02-14 | 2003-11-07 | Fujitsu Ltd | Controller for magnetic tape unit |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3387261A (en) * | 1965-02-05 | 1968-06-04 | Honeywell Inc | Circuit arrangement for detection and correction of errors occurring in the transmission of digital data |
FR1580315A (en) * | 1968-05-27 | 1969-09-05 | ||
BE757116A (en) * | 1969-10-29 | 1971-03-16 | Honeywell Inc | METHOD AND DEVICE FOR CODING SEGMENTS OF CONTROL CODES |
US3958220A (en) * | 1975-05-30 | 1976-05-18 | International Business Machines Corporation | Enhanced error correction |
US4044328A (en) * | 1976-06-22 | 1977-08-23 | Bell & Howell Company | Data coding and error correcting methods and apparatus |
US4201976A (en) * | 1977-12-23 | 1980-05-06 | International Business Machines Corporation | Plural channel error correcting methods and means using adaptive reallocation of redundant channels among groups of channels |
-
1978
- 1978-12-14 JP JP15378378A patent/JPS54118748A/en active Granted
-
1979
- 1979-01-25 FR FR7902411A patent/FR2419543B1/en not_active Expired
- 1979-03-03 DE DE19792908373 patent/DE2908373A1/en active Granted
- 1979-03-05 GB GB7907745A patent/GB2016178B/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2137456A (en) * | 1983-03-04 | 1984-10-03 | Radyne Corp | Carrier data transmission system with error correcting data encoding |
GB2149156A (en) * | 1983-11-04 | 1985-06-05 | Gen Electric Co Plc | A method of encoding and decoding |
WO1989006426A1 (en) * | 1988-01-05 | 1989-07-13 | Digital Equipment Corporation | Stored data error correction system |
US4908826A (en) * | 1988-01-05 | 1990-03-13 | Digital Equipment Corporation | Stored data error correction system |
Also Published As
Publication number | Publication date |
---|---|
DE2908373C2 (en) | 1989-05-11 |
JPS54118748A (en) | 1979-09-14 |
FR2419543B1 (en) | 1986-08-22 |
DE2908373A1 (en) | 1979-09-20 |
JPS6343833B2 (en) | 1988-09-01 |
FR2419543A1 (en) | 1979-10-05 |
GB2016178B (en) | 1982-05-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PE20 | Patent expired after termination of 20 years |
Effective date: 19990304 |