JPS5552517A - Magnetic recording, reading and reproduction system - Google Patents

Magnetic recording, reading and reproduction system

Info

Publication number
JPS5552517A
JPS5552517A JP12460178A JP12460178A JPS5552517A JP S5552517 A JPS5552517 A JP S5552517A JP 12460178 A JP12460178 A JP 12460178A JP 12460178 A JP12460178 A JP 12460178A JP S5552517 A JPS5552517 A JP S5552517A
Authority
JP
Japan
Prior art keywords
head
circuit
signal
output signal
drop
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
JP12460178A
Other languages
Japanese (ja)
Inventor
Yuji Yoshida
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 JP12460178A priority Critical patent/JPS5552517A/en
Publication of JPS5552517A publication Critical patent/JPS5552517A/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

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To suppress an error interval due to a drop-out phenomenon to a minimum by alternating a read output signal, obtained by one magnetic head, with that by the other through a delay circuit when the level of the former decreases below a fixed value. CONSTITUTION:Magnetic head 2 scans the same track lagging magnetic head 1. Now, if a drop-out phenomenon is caused and a read output signal from head 1 decreases in level below a fixed value, an output from amplification sense circuit 6 operates signal change-over circuit 7 to connect the input to the side of head 2 by switching. A read output signal from head 2 is passed through signal delay circuit 5 for an adjustment to the same phase as the output signal from head 1. Namely, the output of variable frequency oscillation circuit 8 maintains the same oscillation frequency as a frequency before the occurrence of the drop-out. The correct demodulation of a magnetic recording signal can therefore be secured by demodulation circuit 9 synchronizing with the output from head 1.
JP12460178A 1978-10-12 1978-10-12 Magnetic recording, reading and reproduction system Pending JPS5552517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12460178A JPS5552517A (en) 1978-10-12 1978-10-12 Magnetic recording, reading and reproduction system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12460178A JPS5552517A (en) 1978-10-12 1978-10-12 Magnetic recording, reading and reproduction system

Publications (1)

Publication Number Publication Date
JPS5552517A true JPS5552517A (en) 1980-04-17

Family

ID=14889475

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12460178A Pending JPS5552517A (en) 1978-10-12 1978-10-12 Magnetic recording, reading and reproduction system

Country Status (1)

Country Link
JP (1) JPS5552517A (en)

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