JPS5525846A - Automatic bias adjuster for tape recorder - Google Patents
Automatic bias adjuster for tape recorderInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03107612U (en) * | 1990-02-21 | 1991-11-06 |
-
1978
- 1978-08-14 JP JP9817478A patent/JPS5923005B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5923005B2 (en) | 1984-05-30 |
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