JPS5651008A - Bias current setting device - Google Patents

Bias current setting device

Info

Publication number
JPS5651008A
JPS5651008A JP12773179A JP12773179A JPS5651008A JP S5651008 A JPS5651008 A JP S5651008A JP 12773179 A JP12773179 A JP 12773179A JP 12773179 A JP12773179 A JP 12773179A JP S5651008 A JPS5651008 A JP S5651008A
Authority
JP
Japan
Prior art keywords
bias current
level
bias
stepwise
reproduction
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
JP12773179A
Other languages
Japanese (ja)
Inventor
Tomohiro Mori
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP12773179A priority Critical patent/JPS5651008A/en
Publication of JPS5651008A publication Critical patent/JPS5651008A/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
    • G11B5/027—Analogue recording
    • G11B5/03—Biasing

Abstract

PURPOSE:To optimize the set of a bias current, by detecting the reproduction output difference level at each step of the intermediate and high band frequency signals, after recording them through stepwise level change of bias current in a magnetic tape, and setting the current at minimum stage at the bias current. CONSTITUTION:A test signal is fed to a tape recorder 2 from an audio frequency generator 3 of a microcomputer 1. The resistance value of a variable resistor 5 is controlled variably so that the level of output bias current of a bias oscillator 4 of a tape recorder 2 can stepwise be changed. A test signal is recorded on a magnetic tape 7 together with the bias current. This operation is made for the signals of intermediate and high band. At reproduction, the level of reproduction output difference for both the frequency signals at each stage is detected via a AD converter 8 and the bias current value corresponding to the minimized step is adopted. Thus, optimum bias current value can be set.
JP12773179A 1979-10-03 1979-10-03 Bias current setting device Pending JPS5651008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12773179A JPS5651008A (en) 1979-10-03 1979-10-03 Bias current setting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12773179A JPS5651008A (en) 1979-10-03 1979-10-03 Bias current setting device

Publications (1)

Publication Number Publication Date
JPS5651008A true JPS5651008A (en) 1981-05-08

Family

ID=14967292

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12773179A Pending JPS5651008A (en) 1979-10-03 1979-10-03 Bias current setting device

Country Status (1)

Country Link
JP (1) JPS5651008A (en)

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