JPS6430003A - Method for erasing magnetic record - Google Patents
Method for erasing magnetic recordInfo
- Publication number
- JPS6430003A JPS6430003A JP18367287A JP18367287A JPS6430003A JP S6430003 A JPS6430003 A JP S6430003A JP 18367287 A JP18367287 A JP 18367287A JP 18367287 A JP18367287 A JP 18367287A JP S6430003 A JPS6430003 A JP S6430003A
- Authority
- JP
- Japan
- Prior art keywords
- video signal
- erasing
- signal
- track
- erased
- 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
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
- Digital Magnetic Recording (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
PURPOSE:To rapidly and surely erase magnetic record by erasing a video signal recorded on a track by alternate magnetic flux generated in accordance with the amplitude level of erasing current flowing into a magnetic head. CONSTITUTION:In an initial period, a track 7a to be erased is saturatedly magnetized by alternate magnetic flux with high amplitude and a recorded video signal is converted into a 14MHz signal, so that the spectrum component of the video signal is removed. In the succeeding period, residual magnetization especially left in a brightness signal band out of the video signal is reduced by alternate magnetic flux whose amplitude is gradually reduced and the level of the erasing current (i) recorded on the track 7a is also reduced. Since the video signal is erased by said procedure, the video signal can be rapidly and surely erased without leaving an erasing signal in the frequency band of the video signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18367287A JPH0743808B2 (en) | 1987-07-24 | 1987-07-24 | Erasing method in magnetic recording |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18367287A JPH0743808B2 (en) | 1987-07-24 | 1987-07-24 | Erasing method in magnetic recording |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6430003A true JPS6430003A (en) | 1989-01-31 |
JPH0743808B2 JPH0743808B2 (en) | 1995-05-15 |
Family
ID=16139907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18367287A Expired - Fee Related JPH0743808B2 (en) | 1987-07-24 | 1987-07-24 | Erasing method in magnetic recording |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0743808B2 (en) |
-
1987
- 1987-07-24 JP JP18367287A patent/JPH0743808B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0743808B2 (en) | 1995-05-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
LAPS | Cancellation because of no payment of annual fees |