JPS5378820A - Magnetic tape - Google Patents

Magnetic tape

Info

Publication number
JPS5378820A
JPS5378820A JP15337076A JP15337076A JPS5378820A JP S5378820 A JPS5378820 A JP S5378820A JP 15337076 A JP15337076 A JP 15337076A JP 15337076 A JP15337076 A JP 15337076A JP S5378820 A JPS5378820 A JP S5378820A
Authority
JP
Japan
Prior art keywords
magnetic tape
change
agc
gain
amplifier
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
JP15337076A
Other languages
Japanese (ja)
Inventor
Yoshihisa Kamo
Zenji Tsutsumi
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 JP15337076A priority Critical patent/JPS5378820A/en
Publication of JPS5378820A publication Critical patent/JPS5378820A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching
    • 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
    • G11B5/455—Arrangements for functional testing of heads; Measuring arrangements for heads

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Digital Magnetic Recording (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To detect the wear of a magnetic head by detecting the change-over signals of an AGC which is made into such a system as to stepwise change the gain of an amplifier.
JP15337076A 1976-12-22 1976-12-22 Magnetic tape Pending JPS5378820A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15337076A JPS5378820A (en) 1976-12-22 1976-12-22 Magnetic tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15337076A JPS5378820A (en) 1976-12-22 1976-12-22 Magnetic tape

Publications (1)

Publication Number Publication Date
JPS5378820A true JPS5378820A (en) 1978-07-12

Family

ID=15560960

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15337076A Pending JPS5378820A (en) 1976-12-22 1976-12-22 Magnetic tape

Country Status (1)

Country Link
JP (1) JPS5378820A (en)

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