JPS54131916A - Magnetic recording system - Google Patents

Magnetic recording system

Info

Publication number
JPS54131916A
JPS54131916A JP3924478A JP3924478A JPS54131916A JP S54131916 A JPS54131916 A JP S54131916A JP 3924478 A JP3924478 A JP 3924478A JP 3924478 A JP3924478 A JP 3924478A JP S54131916 A JPS54131916 A JP S54131916A
Authority
JP
Japan
Prior art keywords
signal
circuit
rotary transformer
nrz
current
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
JP3924478A
Other languages
Japanese (ja)
Inventor
Akira Chuma
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP3924478A priority Critical patent/JPS54131916A/en
Publication of JPS54131916A publication Critical patent/JPS54131916A/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
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To achieve high density recording with a simple constitution by incorporating a write circuit in a rotary head part, sending the signal having been so modulated that DC components become zero through a rotary transformer and converting this to NRZ-I type and recording the same. CONSTITUTION:The write signal A is converted to the signal having no DC components by an inversion circuit 2, delay circuit 3 and modulation circuit 1 consisting of an AND gate 4 taking positive AND and AND gate 5 taking negative AND and this signal is supplied to the primary side of a rotary transformer 8. The signal induced in the secondary side of the rotary transformer 8 of the rotary head part is erased of the pulses on the negative side in a rectifier circuit 9 and flows write current to a magnetic head 12 through an NRZ-I conversion circuit 10. Hence, the current of a negative direction always flows after the current of a positive direction in the primary side of the rotary transformer 8 and no DC components are contained and therefore writing may be performed with high recording density by the use of the NRZ-I modulation system.
JP3924478A 1978-04-05 1978-04-05 Magnetic recording system Pending JPS54131916A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3924478A JPS54131916A (en) 1978-04-05 1978-04-05 Magnetic recording system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3924478A JPS54131916A (en) 1978-04-05 1978-04-05 Magnetic recording system

Publications (1)

Publication Number Publication Date
JPS54131916A true JPS54131916A (en) 1979-10-13

Family

ID=12547711

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3924478A Pending JPS54131916A (en) 1978-04-05 1978-04-05 Magnetic recording system

Country Status (1)

Country Link
JP (1) JPS54131916A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058081A2 (en) * 1981-02-09 1982-08-18 Sony Corporation Methods and apparatus for encoding binary data

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058081A2 (en) * 1981-02-09 1982-08-18 Sony Corporation Methods and apparatus for encoding binary data

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