JPS6486302A - Video scramble system for magnetic recording and reproducing device - Google Patents
Video scramble system for magnetic recording and reproducing deviceInfo
- Publication number
- JPS6486302A JPS6486302A JP24312087A JP24312087A JPS6486302A JP S6486302 A JPS6486302 A JP S6486302A JP 24312087 A JP24312087 A JP 24312087A JP 24312087 A JP24312087 A JP 24312087A JP S6486302 A JPS6486302 A JP S6486302A
- Authority
- JP
- Japan
- Prior art keywords
- luminance signal
- signal
- scramble
- recording
- circuit
- 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.)
- Pending
Links
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
PURPOSE:To eliminate the deterioration of picture quality with simple constitution and less cost by shifting the level of a normal luminance signal, inverting it and applying FM modulation so as to be the same as the recording of the signal through FM modulation at the recording and inverting the FM- demodulated luminance signal into the original polarity at the reproduction. CONSTITUTION:A luminance signal from a scramble circuit 18 is FM-modulated by an FM modulator 19, mixed with a low frequency conversion chrominance signal in a mixer 20. On the other hand, the separated FL luminance signal is FM-modulated by an FM demodulation circuit 35, inputted to a de-emphasis circuit 36 and subjected to de-emphasis processing. The luminance signal subjected to de-emphasis processing is fed to a de-scramble circuit 37, and in case of the scrambled signal, scramble release processing is applied. Thus, scramble/descramble processing is attained with simple constitution by the inversion and level shift of the luminance signal and the frequency shift is the same as the conventional luminance signal recording, the picture quality is not lost.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24312087A JPS6486302A (en) | 1987-09-28 | 1987-09-28 | Video scramble system for magnetic recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24312087A JPS6486302A (en) | 1987-09-28 | 1987-09-28 | Video scramble system for magnetic recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6486302A true JPS6486302A (en) | 1989-03-31 |
Family
ID=17099097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24312087A Pending JPS6486302A (en) | 1987-09-28 | 1987-09-28 | Video scramble system for magnetic recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6486302A (en) |
-
1987
- 1987-09-28 JP JP24312087A patent/JPS6486302A/en active Pending
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