JPS5745719A - Readout circuit for magnetic disc device - Google Patents

Readout circuit for magnetic disc device

Info

Publication number
JPS5745719A
JPS5745719A JP55120748A JP12074880A JPS5745719A JP S5745719 A JPS5745719 A JP S5745719A JP 55120748 A JP55120748 A JP 55120748A JP 12074880 A JP12074880 A JP 12074880A JP S5745719 A JPS5745719 A JP S5745719A
Authority
JP
Japan
Prior art keywords
zero
cross
pulse
digital
area
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
Application number
JP55120748A
Other languages
Japanese (ja)
Inventor
Masayoshi Kamo
Hajime Sasaki
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.)
Computer Basic Technology Research Association Corp
Original Assignee
Computer Basic Technology Research Association 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 Computer Basic Technology Research Association Corp filed Critical Computer Basic Technology Research Association Corp
Priority to JP55120748A priority Critical patent/JPS5745719A/en
Publication of JPS5745719A publication Critical patent/JPS5745719A/en
Pending legal-status Critical Current

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
    • G11B20/10009—Improvement or modification of read or write signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To reject artificial zero-cross pulse appeared when the interference between adjacent bits is less, by connecting a digital zero-cross pulse and a window pulse to a logical product circuit to form a digital signal. CONSTITUTION:If an extra pulse is present in an area 13 of a readout analog waveform 12, zero-cross points having large or small amplitude are produced at an area 15 of its differentiation waveform 14. A number of artificial zeros are produced in an area 17 in digital zero-cross pulse 16 of a zero-cross point detection circuit. Positive and negative reference voltages are provided to the positive/negative output waveforms of the said readout analog waveform 12 to produce a digital window pulse 18 having the width corresponding to the time interval of the output waveform more than the positive reference voltage +VT and less than the negative reference voltage -VT is produced to take the logical product with the digital zero-cross pulse 16. Thus, a digital zero-cross pulse 19 rejecting the artificial zero-cross of the area 17 can be obtained.
JP55120748A 1980-09-01 1980-09-01 Readout circuit for magnetic disc device Pending JPS5745719A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55120748A JPS5745719A (en) 1980-09-01 1980-09-01 Readout circuit for magnetic disc device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55120748A JPS5745719A (en) 1980-09-01 1980-09-01 Readout circuit for magnetic disc device

Publications (1)

Publication Number Publication Date
JPS5745719A true JPS5745719A (en) 1982-03-15

Family

ID=14794002

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55120748A Pending JPS5745719A (en) 1980-09-01 1980-09-01 Readout circuit for magnetic disc device

Country Status (1)

Country Link
JP (1) JPS5745719A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5981570A (en) * 1982-11-01 1984-05-11 Hitachi Ltd Optical magnetic field measuring device
JPS59104077U (en) * 1982-12-28 1984-07-13 ソニー株式会社 Motor speed detection circuit
JPS641155A (en) * 1987-06-22 1989-01-05 Nippon Densan Kk Index signal circuit
US7811465B2 (en) * 2004-11-19 2010-10-12 Tdk Corporation Magnetic garnet single crystal and optical element using same as well as method of producing single crystal
US7828895B2 (en) 2006-01-27 2010-11-09 Tdk Corporation Method of producing optical element

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542392A (en) * 1978-09-18 1980-03-25 Burroughs Corp Method and device foe evaluating regenerating signal in magnetic recording system
JPS5575342A (en) * 1978-12-01 1980-06-06 Nec Corp Signal detector circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542392A (en) * 1978-09-18 1980-03-25 Burroughs Corp Method and device foe evaluating regenerating signal in magnetic recording system
JPS5575342A (en) * 1978-12-01 1980-06-06 Nec Corp Signal detector circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5981570A (en) * 1982-11-01 1984-05-11 Hitachi Ltd Optical magnetic field measuring device
JPS59104077U (en) * 1982-12-28 1984-07-13 ソニー株式会社 Motor speed detection circuit
JPH0543414Y2 (en) * 1982-12-28 1993-11-01
JPS641155A (en) * 1987-06-22 1989-01-05 Nippon Densan Kk Index signal circuit
US7811465B2 (en) * 2004-11-19 2010-10-12 Tdk Corporation Magnetic garnet single crystal and optical element using same as well as method of producing single crystal
US7828895B2 (en) 2006-01-27 2010-11-09 Tdk Corporation Method of producing optical element

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