JPS5683819A - Magnetic recording system - Google Patents
Magnetic recording systemInfo
- Publication number
- JPS5683819A JPS5683819A JP16104979A JP16104979A JPS5683819A JP S5683819 A JPS5683819 A JP S5683819A JP 16104979 A JP16104979 A JP 16104979A JP 16104979 A JP16104979 A JP 16104979A JP S5683819 A JPS5683819 A JP S5683819A
- Authority
- JP
- Japan
- Prior art keywords
- input
- circuit
- outputs
- nand
- circuits
- 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.)
- Pending
Links
Landscapes
- Digital Magnetic Recording (AREA)
Abstract
PURPOSE: To improve the level margin, by recording the first and the last inversion positions forward and backward from regular positions respectively when the minimum interval of magnetization inversion continues twice, in the magnetic recording system where binary information is recorded correspondingly to presence and absence of magnetization inversion.
CONSTITUTION: The write clock signal is delayed by delay circuits 20 and 21 and is input to shift register 7 to form a shift timing. Output of the 0thWthe fourth stages of shift register 7 are input to NAND circuit 12, and outputs of the secondW the sixth stages are input to NAND circuit 13. However inhibiting circuit 8W11 are interposed for outputs of the 0th, the fourth, the second, and the sixth stages. The output of the third stage and outputs of NAND circuits 12 and 13 are input to NAND circuit 41. Outputs of NAND circuits 12W14 are input to NOR circuits 15W 17 respectively and pass through OR circuit 18, 1/2 frequency dividing circuit 19 as clock signals (1)W(3) respectively to output a signal obtained by subjecting data to NRZ modulation. As a result, the level margin is improved.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16104979A JPS5683819A (en) | 1979-12-12 | 1979-12-12 | Magnetic recording system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16104979A JPS5683819A (en) | 1979-12-12 | 1979-12-12 | Magnetic recording system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5683819A true JPS5683819A (en) | 1981-07-08 |
Family
ID=15727625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16104979A Pending JPS5683819A (en) | 1979-12-12 | 1979-12-12 | Magnetic recording system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5683819A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5987610A (en) * | 1982-11-10 | 1984-05-21 | Fujitsu Ltd | Pre-shifting circuit of write data |
US6157506A (en) * | 1997-03-18 | 2000-12-05 | Fujitsu Limited | Write compensation method and magnetic disk apparatus adapted for high-density recording |
-
1979
- 1979-12-12 JP JP16104979A patent/JPS5683819A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5987610A (en) * | 1982-11-10 | 1984-05-21 | Fujitsu Ltd | Pre-shifting circuit of write data |
JPH0465442B2 (en) * | 1982-11-10 | 1992-10-20 | Fujitsu Ltd | |
US6157506A (en) * | 1997-03-18 | 2000-12-05 | Fujitsu Limited | Write compensation method and magnetic disk apparatus adapted for high-density recording |
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