JPS5473614A - Reading method of magnetic recorded information - Google Patents

Reading method of magnetic recorded information

Info

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
Application number
JP14121177A
Other languages
Japanese (ja)
Other versions
JPS628844B2 (en
Inventor
Tadahiko Kameyama
Hiroshi Nakanishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP14121177A priority Critical patent/JPS5473614A/en
Publication of JPS5473614A publication Critical patent/JPS5473614A/en
Publication of JPS628844B2 publication Critical patent/JPS628844B2/ja
Granted legal-status Critical Current

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
JP14121177A 1977-11-25 1977-11-25 Reading method of magnetic recorded information Granted JPS5473614A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50103312A (en) * 1974-01-14 1975-08-15

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50103312A (en) * 1974-01-14 1975-08-15

Cited By (2)

* Cited by examiner, † Cited by third party
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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