JPS576407A - Bias current setting device - Google Patents

Bias current setting device

Info

Publication number
JPS576407A
JPS576407A JP7949480A JP7949480A JPS576407A JP S576407 A JPS576407 A JP S576407A JP 7949480 A JP7949480 A JP 7949480A JP 7949480 A JP7949480 A JP 7949480A JP S576407 A JPS576407 A JP S576407A
Authority
JP
Japan
Prior art keywords
bias current
microcomputer
drawing out
level
output 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.)
Granted
Application number
JP7949480A
Other languages
Japanese (ja)
Other versions
JPS6142323B2 (en
Inventor
Hiroki Shimizu
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 JP7949480A priority Critical patent/JPS576407A/en
Publication of JPS576407A publication Critical patent/JPS576407A/en
Publication of JPS6142323B2 publication Critical patent/JPS6142323B2/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
    • G11B5/027—Analogue recording
    • G11B5/03—Biasing

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To set a bias current automatically in accordance with a characteristics of a tape and a head, by drawing out the highest output level of low frequencies, and also drawing out the highest output level of high frequencies up to the maximum, suppressing a distortion rate to a constant value or less. CONSTITUTION:A bias oscillator 3 supplies a bias current to a head 5 of a tape recorder 1 through a bias current controlling circuit 4 which is controlled by a microcomputer 2, and also high and low frequency signals of an audio frequency oscillator 6 are applied after the selection and level have been controlled by the microcomputer 2. Moreover, a reproducing output is detected by the first wave detecting circuit 8, and the second wave detecting circuit 10 through a band-pass filter 9, and is applied to the microcomputer 2 through an AD converter 11. Accordingly, a bias current is set by drawing out a reproduction level which has been approximated to MOL of high frequencies, keeping an output level at MOL point of low frequencies, at a constant value, and also suppressing it to a prescirbed distortion rate or below.
JP7949480A 1980-06-12 1980-06-12 Bias current setting device Granted JPS576407A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7949480A JPS576407A (en) 1980-06-12 1980-06-12 Bias current setting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7949480A JPS576407A (en) 1980-06-12 1980-06-12 Bias current setting device

Publications (2)

Publication Number Publication Date
JPS576407A true JPS576407A (en) 1982-01-13
JPS6142323B2 JPS6142323B2 (en) 1986-09-20

Family

ID=13691454

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7949480A Granted JPS576407A (en) 1980-06-12 1980-06-12 Bias current setting device

Country Status (1)

Country Link
JP (1) JPS576407A (en)

Also Published As

Publication number Publication date
JPS6142323B2 (en) 1986-09-20

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