JPS6437767A - System and device for modulating and demodulating video signal - Google Patents
System and device for modulating and demodulating video signalInfo
- Publication number
- JPS6437767A JPS6437767A JP62192465A JP19246587A JPS6437767A JP S6437767 A JPS6437767 A JP S6437767A JP 62192465 A JP62192465 A JP 62192465A JP 19246587 A JP19246587 A JP 19246587A JP S6437767 A JPS6437767 A JP S6437767A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- video signal
- input terminal
- modulated
- time
- 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
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE:To modulate a video signal without reducing information utilized for correcting a time base by replacing the synchronizing signal part of the video signal with a reference signal when the video signal to include a synchronizing signal is angle-modulated and suppressing the turbulence of a demodulated signal to be generated preceding and succeeding to the replacement when the modulated signal is demodulated. CONSTITUTION:By replacing the synchronizing signal part of the video signal with the reference signal at the time of preparing an angle-modulated signal, the turbulence of the modulated wave is suppressed and by causing the synchronizing signal part in the demodulated signal to be a constant voltage at the time of the demodulating, an influence given to an image reproducing is decreased. Namely, a switch S2 is controlled by a composite sinchronizing signal (c-sync) inputted from a terminal B (separated from the video signal inputted to an input terminal A). During a period corresponding to the sync-chip part of the video signal inputted to the input terminal A, an output terminal is connected to an input terminal E and in the other case, the output terminal is connected to an input terminal D. Thus, the correction of a time base fluctuation can be securely executed at the time of the reproduction.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62192465A JPS6437767A (en) | 1987-07-31 | 1987-07-31 | System and device for modulating and demodulating video signal |
DE19883814447 DE3814447A1 (en) | 1987-04-28 | 1988-04-28 | Apparatus for recording and/or reproducing information signals |
US07/831,084 US5231507A (en) | 1987-04-28 | 1992-02-05 | Information signal recording/reproducing apparatus with time base correction facility |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62192465A JPS6437767A (en) | 1987-07-31 | 1987-07-31 | System and device for modulating and demodulating video signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6437767A true JPS6437767A (en) | 1989-02-08 |
Family
ID=16291748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62192465A Pending JPS6437767A (en) | 1987-04-28 | 1987-07-31 | System and device for modulating and demodulating video signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6437767A (en) |
-
1987
- 1987-07-31 JP JP62192465A patent/JPS6437767A/en active Pending
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