JPS5458423A - Magnetic recorder-reproducer - Google Patents

Magnetic recorder-reproducer

Info

Publication number
JPS5458423A
JPS5458423A JP12449677A JP12449677A JPS5458423A JP S5458423 A JPS5458423 A JP S5458423A JP 12449677 A JP12449677 A JP 12449677A JP 12449677 A JP12449677 A JP 12449677A JP S5458423 A JPS5458423 A JP S5458423A
Authority
JP
Japan
Prior art keywords
gain
circuit
output
amplifier
slice level
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
JP12449677A
Other languages
Japanese (ja)
Inventor
Toshiharu Kawamura
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 JP12449677A priority Critical patent/JPS5458423A/en
Publication of JPS5458423A publication Critical patent/JPS5458423A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Digital Magnetic Recording (AREA)

Abstract

PURPOSE: To obtain a gain setting device which has the effect of assuring the inferior portions of the recording quality and reading quality of ARA.
CONSTITUTION: The automatic gain control signal ARA used in an magnetic tape apparatus is recorded in the leading end part of a magentic tape and the gain of an amplifier at the time of reproducing and drawing out information is set with this as a reference. The amplifier 2 connected to a read head 1 is increased of its gain by the output of the OSC 4 which starts operation together with travel signal 12 and the SAGC 3 which controls the gain in correspondence to the period of step-up pulses 9. A slice level control 5 changes over the slice level 6 and when it obtains the signal exceeding the slice level, it draws out the output from a waveform shaping circuit 7. The output of the circuit 7 operates a gain setting circuit 8 and determines the gain of the amplifier 2 by the SAGC 3. A check circuit 11 determines the suita bility and unsuitability of the set gain of the circuit 8 by observing the output of the circuit 7
COPYRIGHT: (C)1979,JPO&Japio
JP12449677A 1977-10-19 1977-10-19 Magnetic recorder-reproducer Pending JPS5458423A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12449677A JPS5458423A (en) 1977-10-19 1977-10-19 Magnetic recorder-reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12449677A JPS5458423A (en) 1977-10-19 1977-10-19 Magnetic recorder-reproducer

Publications (1)

Publication Number Publication Date
JPS5458423A true JPS5458423A (en) 1979-05-11

Family

ID=14886923

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12449677A Pending JPS5458423A (en) 1977-10-19 1977-10-19 Magnetic recorder-reproducer

Country Status (1)

Country Link
JP (1) JPS5458423A (en)

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