SE405179B - Sett och anordning for lesning av data - Google Patents
Sett och anordning for lesning av dataInfo
- Publication number
- SE405179B SE405179B SE7704447A SE7704447A SE405179B SE 405179 B SE405179 B SE 405179B SE 7704447 A SE7704447 A SE 7704447A SE 7704447 A SE7704447 A SE 7704447A SE 405179 B SE405179 B SE 405179B
- Authority
- SE
- Sweden
- Prior art keywords
- reading data
- reading
- data
- Prior art date
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
- G11B20/14—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
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7704447A SE405179B (sv) | 1977-04-19 | 1977-04-19 | Sett och anordning for lesning av data |
US05/897,517 US4171479A (en) | 1977-04-19 | 1978-04-18 | Method and device for the reading of data |
DE19782816708 DE2816708A1 (de) | 1977-04-19 | 1978-04-18 | Verfahren und vorrichtung zum lesen von daten |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7704447A SE405179B (sv) | 1977-04-19 | 1977-04-19 | Sett och anordning for lesning av data |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7704447L SE7704447L (sv) | 1978-10-20 |
SE405179B true SE405179B (sv) | 1978-11-20 |
Family
ID=20331051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7704447A SE405179B (sv) | 1977-04-19 | 1977-04-19 | Sett och anordning for lesning av data |
Country Status (3)
Country | Link |
---|---|
US (1) | US4171479A (sv) |
DE (1) | DE2816708A1 (sv) |
SE (1) | SE405179B (sv) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5864608A (ja) * | 1981-10-15 | 1983-04-18 | Victor Co Of Japan Ltd | デイジタル信号記録再生方式 |
US4633333A (en) * | 1985-06-24 | 1986-12-30 | International Business Machines Corporation | Detection of instantaneous speed variations in a tape drive |
US4808884A (en) * | 1985-12-02 | 1989-02-28 | Western Digital Corporation | High order digital phase-locked loop system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3676644A (en) * | 1970-03-05 | 1972-07-11 | Columbia Controls Research Cor | Coded document and system for automatically reading same |
US3676645A (en) * | 1970-04-09 | 1972-07-11 | William E Fickenscher | Deep field optical label reader including means for certifying the validity of a label reading |
JPS5085320A (sv) * | 1973-11-27 | 1975-07-09 | ||
US3932731A (en) * | 1974-08-02 | 1976-01-13 | Bell Telephone Laboratories, Incorporated | Code converter |
US4012791A (en) * | 1974-10-24 | 1977-03-15 | Pertec Computer Corporation | Disk drive apparatus |
US3975769A (en) * | 1975-02-07 | 1976-08-17 | International Business Machines Corporation | Storage device utilizing flexible magnetic disks |
-
1977
- 1977-04-19 SE SE7704447A patent/SE405179B/sv unknown
-
1978
- 1978-04-18 US US05/897,517 patent/US4171479A/en not_active Expired - Lifetime
- 1978-04-18 DE DE19782816708 patent/DE2816708A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
US4171479A (en) | 1979-10-16 |
SE7704447L (sv) | 1978-10-20 |
DE2816708A1 (de) | 1978-10-26 |
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