JPS5619510A - Automatic gain adjusting system in magnetic tape unit - Google Patents

Automatic gain adjusting system in magnetic tape unit

Info

Publication number
JPS5619510A
JPS5619510A JP9450679A JP9450679A JPS5619510A JP S5619510 A JPS5619510 A JP S5619510A JP 9450679 A JP9450679 A JP 9450679A JP 9450679 A JP9450679 A JP 9450679A JP S5619510 A JPS5619510 A JP S5619510A
Authority
JP
Japan
Prior art keywords
gain
magnetic tape
dropout
amplifier
automatic gain
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
JP9450679A
Other languages
Japanese (ja)
Inventor
Toshihiko Fujii
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9450679A priority Critical patent/JPS5619510A/en
Publication of JPS5619510A publication Critical patent/JPS5619510A/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

  • Digital Magnetic Recording (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To enable the automatic adjustment of optimum gain without giving effect on dropout. by lowering the gain of amplifier having the maximum gain according to the readout output based on the amplitude. CONSTITUTION:The constant amplitude signal from the amplitude reference area 3 of the magnetic tape 1 is read out and fed to the comparator 13 via the amplifier 12 having the highest gain. Further, according to the down signal output from the Self Auto-Gain Control 15 based on the output of the comparator 13, the gain of the amplifier 12 is lowered and controlled for the maximum value. Accordingly, as the upward control of gain, the control obtaining high gain as required with the dropout is not made and the automatic adjustment is made to the optimum gain without the effect by dropout.
JP9450679A 1979-07-25 1979-07-25 Automatic gain adjusting system in magnetic tape unit Pending JPS5619510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9450679A JPS5619510A (en) 1979-07-25 1979-07-25 Automatic gain adjusting system in magnetic tape unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9450679A JPS5619510A (en) 1979-07-25 1979-07-25 Automatic gain adjusting system in magnetic tape unit

Publications (1)

Publication Number Publication Date
JPS5619510A true JPS5619510A (en) 1981-02-24

Family

ID=14112193

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9450679A Pending JPS5619510A (en) 1979-07-25 1979-07-25 Automatic gain adjusting system in magnetic tape unit

Country Status (1)

Country Link
JP (1) JPS5619510A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087907A2 (en) * 1982-02-25 1983-09-07 Racal Recorders Ltd Calibration system for a magnetic recording apparatus, and calibration arrangement for use with a magnetic storage medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0087907A2 (en) * 1982-02-25 1983-09-07 Racal Recorders Ltd Calibration system for a magnetic recording apparatus, and calibration arrangement for use with a magnetic storage medium

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