GB1132176A - A method of reading magnetically recorded data - Google Patents
A method of reading magnetically recorded dataInfo
- Publication number
- GB1132176A GB1132176A GB1012667A GB1012667A GB1132176A GB 1132176 A GB1132176 A GB 1132176A GB 1012667 A GB1012667 A GB 1012667A GB 1012667 A GB1012667 A GB 1012667A GB 1132176 A GB1132176 A GB 1132176A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bits
- recorded
- areas
- track
- tracks
- 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
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/16—Digital recording or reproducing using non self-clocking codes, i.e. the clock signals are either recorded in a separate clocking track or in a combination of several information tracks
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/1608—Error detection by comparing the output signals of redundant hardware
- G06F11/1612—Error detection by comparing the output signals of redundant hardware where the redundant component is persistent storage
-
- 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
- G11B20/1803—Error detection or correction; Testing, e.g. of drop-outs by redundancy in data representation
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Digital Magnetic Recording (AREA)
- Magnetic Record Carriers (AREA)
Abstract
1,132,176. Magnetic records. SIEMAG FEINMECHANISCHE WERKE G.m.b.H. 3 March, 1967 [26 April, 1966], No. 10126/67. Headings G4C and G4M. Binary-coded characters having an even number of bits, e.g. 4, are recorded on magnetic tape or a magnetic strip on a ledger card in a manner which allows errors caused by incorrect positioning of the recorded bits to be detected. There are half as many information tracks I as there are bits in the characters, i.e. for 4 bits there are two tracks I 1 , I 2 on which bits are recorded in NRZ form, and there is the same number of complement tracks K 1 , K 2 . Each track is subdivided into alternating bit areas S 1 , S 2 , even-numbered bits being recorded in S 1 areas, and odd-numbered bits being recorded in S 2 areas. Each track I has the same polarity as its associated complement track K in areas S 2 and the opposite polarity to the complement track K in areas S 1 , and any displacement, either lateral or longitudinal, of a recorded 1 bit into an adjacent bit area causes this relationship to be reversed, so that such errors can be detected when the record is sensed, e.g. by heads moving relatively thereto.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1966S0103425 DE1499891C3 (en) | 1966-04-26 | 1966-04-26 | Device for recording and reading implementation and complement tracks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1132176A true GB1132176A (en) | 1968-10-30 |
Family
ID=7525169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1012667A Expired GB1132176A (en) | 1966-04-26 | 1967-03-03 | A method of reading magnetically recorded data |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1499891C3 (en) |
| FR (1) | FR1516376A (en) |
| GB (1) | GB1132176A (en) |
| SE (1) | SE344842B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITTO20110385A1 (en) * | 2011-05-03 | 2012-11-04 | Stefano Maruelli | READING AND WRITING SYSTEM |
-
1966
- 1966-04-26 DE DE1966S0103425 patent/DE1499891C3/en not_active Expired
-
1967
- 1967-02-28 FR FR96818A patent/FR1516376A/en not_active Expired
- 1967-03-03 GB GB1012667A patent/GB1132176A/en not_active Expired
- 1967-03-03 SE SE290367A patent/SE344842B/xx unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITTO20110385A1 (en) * | 2011-05-03 | 2012-11-04 | Stefano Maruelli | READING AND WRITING SYSTEM |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1499891A1 (en) | 1970-07-09 |
| FR1516376A (en) | 1968-03-08 |
| DE1499891C3 (en) | 1978-10-12 |
| SE344842B (en) | 1972-05-02 |
| DE1499891B2 (en) | 1978-02-09 |
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