JPS5567918A - Optimum recording level detecting method of magnetic recording and reproducing device - Google Patents
Optimum recording level detecting method of magnetic recording and reproducing deviceInfo
- Publication number
- JPS5567918A JPS5567918A JP14147278A JP14147278A JPS5567918A JP S5567918 A JPS5567918 A JP S5567918A JP 14147278 A JP14147278 A JP 14147278A JP 14147278 A JP14147278 A JP 14147278A JP S5567918 A JPS5567918 A JP S5567918A
- Authority
- JP
- Japan
- Prior art keywords
- level
- reproduction output
- recording
- sequentially
- processor
- 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 detect automatically the best recording level by detecting a recording level equivalent to a reproduction output equal to a reference level by storing the reproduction output of a signal varying sequentially by steps which is recorded together with a fixed bias current.
CONSTITUTION: In accordance with a program in ROM19, a signal varying in level by steps sequentially through recording level setting circuit 4 is recorded by microprocessor 18 on magnetic tape 7 together with a fixed bias current from bias setting circuit 8. Then, a reproduction output from tape 7 which is placed in rewind, halt and feed modes under the control of processor 18 is sequentially compared by A/D converter 17 and comparator 16 to obtain a digital signal, which is sequentially stored at a fixed address of RAM of processor 18. On the basis of memory contents, processor 18 performs fixed arithmetic to select a reproduction output equal to a reference level and a recording signal level equivalent to the reproduction output is considered the best level. The best recording level for various tapes are therefore detected automatically.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14147278A JPS6045494B2 (en) | 1978-11-16 | 1978-11-16 | Optimal recording level detection method for magnetic recording and playback equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14147278A JPS6045494B2 (en) | 1978-11-16 | 1978-11-16 | Optimal recording level detection method for magnetic recording and playback equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5567918A true JPS5567918A (en) | 1980-05-22 |
JPS6045494B2 JPS6045494B2 (en) | 1985-10-09 |
Family
ID=15292672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14147278A Expired JPS6045494B2 (en) | 1978-11-16 | 1978-11-16 | Optimal recording level detection method for magnetic recording and playback equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6045494B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63171178U (en) * | 1987-04-28 | 1988-11-08 |
-
1978
- 1978-11-16 JP JP14147278A patent/JPS6045494B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS6045494B2 (en) | 1985-10-09 |
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