JPS5473614A - Reading method of magnetic recorded information - Google Patents
Reading method of magnetic recorded informationInfo
- Publication number
- JPS5473614A JPS5473614A JP14121177A JP14121177A JPS5473614A JP S5473614 A JPS5473614 A JP S5473614A JP 14121177 A JP14121177 A JP 14121177A JP 14121177 A JP14121177 A JP 14121177A JP S5473614 A JPS5473614 A JP S5473614A
- Authority
- JP
- Japan
- Prior art keywords
- level
- levels
- judging
- output signal
- recorded information
- 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
Landscapes
- Digital Magnetic Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Manipulation Of Pulses (AREA)
Abstract
PURPOSE: To enable clear reading even in high density recording causing pulse clouding phenomenon, by judging the recorded information read out by a magnetic head under special condition.
CONSTITUTION: The constitution comprises a differentiating circuit DF to differentiate the magnetic recorded information read out by a magnetic head HD, judging circuits LV1 to LV5 to judge the level of such output signal, logic circuits FF, OR, etc. to issue signal when the result of level judging conforms to a certain condition. The judging level is set in 5 values, namely, level L1 showing the level at the no- signal time of the differentiated output signal, levels L2, L4 positive than level L1, and levels L3, L5 negative than level L1. And only at the condition when the output signal of the differentiating circuit DF runs across in the order of levels L2, L1, L4, levels L4, L1, L2, levels L3, L1, L5, or levels L5 L1, L3, the logic circuits FF, OR are designed to output a detection signal at a point delayed a certain time from the moment of the differentiated output signal running across level L1.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14121177A JPS5473614A (en) | 1977-11-25 | 1977-11-25 | Reading method of magnetic recorded information |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14121177A JPS5473614A (en) | 1977-11-25 | 1977-11-25 | Reading method of magnetic recorded information |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5473614A true JPS5473614A (en) | 1979-06-13 |
JPS628844B2 JPS628844B2 (en) | 1987-02-25 |
Family
ID=15286715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14121177A Granted JPS5473614A (en) | 1977-11-25 | 1977-11-25 | Reading method of magnetic recorded information |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5473614A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58218261A (en) * | 1982-06-11 | 1983-12-19 | Matsushita Electric Ind Co Ltd | Data waveform shaping circit |
JPH05182120A (en) * | 1991-12-26 | 1993-07-23 | Hitachi Ltd | Recording and reproducing method for information recording and reproducing device and device therefor |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50103312A (en) * | 1974-01-14 | 1975-08-15 |
-
1977
- 1977-11-25 JP JP14121177A patent/JPS5473614A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50103312A (en) * | 1974-01-14 | 1975-08-15 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58218261A (en) * | 1982-06-11 | 1983-12-19 | Matsushita Electric Ind Co Ltd | Data waveform shaping circit |
JPH05182120A (en) * | 1991-12-26 | 1993-07-23 | Hitachi Ltd | Recording and reproducing method for information recording and reproducing device and device therefor |
Also Published As
Publication number | Publication date |
---|---|
JPS628844B2 (en) | 1987-02-25 |
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