JPS55153116A - Gain control system - Google Patents

Gain control system

Info

Publication number
JPS55153116A
JPS55153116A JP4398479A JP4398479A JPS55153116A JP S55153116 A JPS55153116 A JP S55153116A JP 4398479 A JP4398479 A JP 4398479A JP 4398479 A JP4398479 A JP 4398479A JP S55153116 A JPS55153116 A JP S55153116A
Authority
JP
Japan
Prior art keywords
gain
circuit
comparator
gain adjustment
clock
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
JP4398479A
Other languages
Japanese (ja)
Other versions
JPS6115508B2 (en
Inventor
Michio Matsuura
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 JP4398479A priority Critical patent/JPS55153116A/en
Publication of JPS55153116A publication Critical patent/JPS55153116A/en
Publication of JPS6115508B2 publication Critical patent/JPS6115508B2/ja
Granted 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)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To make the best gain adjustment possible by a gain control system for a magnetic tape, by making fixed gain adjustment in amplitude reference area (ARA) and a data area. CONSTITUTION:Signals from magnetic head 1 are sent to differential amplifier 4 by way of amplifier 2 and gain change-over circuit 3. Its output is supplied to comparator 7 and demodulating circuit 5. Here, the signal amplitude of input line l of circuit 5 is held constant. In addition, down-counter 6 is set to a maximum count. Amplitude reference area ARA is read and read data are compared by comparator 7 to RRef to decrease the count of counter 6 gradually by making use of clock CL1, thereby adjusting the gain to a fixed reference level. At a slight interval from the point in time when a data block ends, clock CL2 is generated and on arrival of an output exceeding VRef of comparator 7, the steps of gain circuit 3 are changed. Therefore, the best gain adjustment can be made.
JP4398479A 1979-04-11 1979-04-11 Gain control system Granted JPS55153116A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4398479A JPS55153116A (en) 1979-04-11 1979-04-11 Gain control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4398479A JPS55153116A (en) 1979-04-11 1979-04-11 Gain control system

Publications (2)

Publication Number Publication Date
JPS55153116A true JPS55153116A (en) 1980-11-28
JPS6115508B2 JPS6115508B2 (en) 1986-04-24

Family

ID=12678976

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4398479A Granted JPS55153116A (en) 1979-04-11 1979-04-11 Gain control system

Country Status (1)

Country Link
JP (1) JPS55153116A (en)

Also Published As

Publication number Publication date
JPS6115508B2 (en) 1986-04-24

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