JPS5525846A - Automatic bias adjuster for tape recorder - Google Patents

Automatic bias adjuster for tape recorder

Info

Publication number
JPS5525846A
JPS5525846A JP9817478A JP9817478A JPS5525846A JP S5525846 A JPS5525846 A JP S5525846A JP 9817478 A JP9817478 A JP 9817478A JP 9817478 A JP9817478 A JP 9817478A JP S5525846 A JPS5525846 A JP S5525846A
Authority
JP
Japan
Prior art keywords
bias
signal
head
given
peak
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
JP9817478A
Other languages
Japanese (ja)
Other versions
JPS5923005B2 (en
Inventor
Shigeru Okada
Takaharu Noguchi
Takao Arai
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 JP9817478A priority Critical patent/JPS5923005B2/en
Publication of JPS5525846A publication Critical patent/JPS5525846A/en
Publication of JPS5923005B2 publication Critical patent/JPS5923005B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To secure an easy and high-accuracy setting for the optimum bias value suited to each magnetic tape by detecting the peak bias value of the signal featuring a certain specific frequency.
CONSTITUTION: The signal given from bias signal generator 11 is attenuated by variable resistor 13 and in a fixed ratio and then supplied sound record head 16 via bias current controller 14. Controller 14 increases gradually the bias current with start of the bias adjustment, records the signal of 4K Hz given from adjustment signal generator 20 and given to head 16 through amplifier 15 on magnetic tape 17, reproduces the signal immediately through head 18 to then feed it back, and holds the bias value at the time point when the reproduction output features the peak level. At the same time, switch 12 is turned on, and the bias signal attenuated by resistor 13 increases with a fixed rate. And the optimum bias current equivalent to the peak bias of 1K Hz is supplied to head 16. In such way, the optimum bias value can be set easily and with a high accuracy.
COPYRIGHT: (C)1980,JPO&Japio
JP9817478A 1978-08-14 1978-08-14 Automatic bias adjustment device for tape recorder Expired JPS5923005B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9817478A JPS5923005B2 (en) 1978-08-14 1978-08-14 Automatic bias adjustment device for tape recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9817478A JPS5923005B2 (en) 1978-08-14 1978-08-14 Automatic bias adjustment device for tape recorder

Publications (2)

Publication Number Publication Date
JPS5525846A true JPS5525846A (en) 1980-02-23
JPS5923005B2 JPS5923005B2 (en) 1984-05-30

Family

ID=14212673

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9817478A Expired JPS5923005B2 (en) 1978-08-14 1978-08-14 Automatic bias adjustment device for tape recorder

Country Status (1)

Country Link
JP (1) JPS5923005B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03107612U (en) * 1990-02-21 1991-11-06

Also Published As

Publication number Publication date
JPS5923005B2 (en) 1984-05-30

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