JPS6471280A - On-screen display circuit - Google Patents
On-screen display circuitInfo
- Publication number
- JPS6471280A JPS6471280A JP62226276A JP22627687A JPS6471280A JP S6471280 A JPS6471280 A JP S6471280A JP 62226276 A JP62226276 A JP 62226276A JP 22627687 A JP22627687 A JP 22627687A JP S6471280 A JPS6471280 A JP S6471280A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- horizontal synchronizing
- phase
- synchronizing signal
- 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
- Studio Circuits (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE:To make the display stable by using an automatic frequency control circuit so as to change a horizontal synchronizing signal separated from a reproduced video signal into a horizontal signal without excess of synchronization or missing of it so as to supply the result onto an on-screen display means. CONSTITUTION:A phase locked loop circuit 5 changes a horizontal synchronizing signal separated from a reproduced video signal by a synchronizing separator circuit into a horizontal synchronizing signal without excess or missing of synchronization and supplies the result to a character signal generating circuit 3. The phase locked loop circuit 5 compares the phase of an output horizontal synchronizing signal with that of the oscillated output from a voltage controlled oscillator 7 by a phase comparator 6 and feeds back the obtained phase comparison error to the voltage controlled oscillator 7 via a low pass filter circuit 8.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62226276A JPS6471280A (en) | 1987-09-11 | 1987-09-11 | On-screen display circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62226276A JPS6471280A (en) | 1987-09-11 | 1987-09-11 | On-screen display circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6471280A true JPS6471280A (en) | 1989-03-16 |
Family
ID=16842673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62226276A Pending JPS6471280A (en) | 1987-09-11 | 1987-09-11 | On-screen display circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6471280A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7199834B2 (en) | 2001-06-29 | 2007-04-03 | Matsushita Electric Industrial Co., Ltd. | Vertical synchronizing signal generation apparatus and video signal processing apparatus |
-
1987
- 1987-09-11 JP JP62226276A patent/JPS6471280A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7199834B2 (en) | 2001-06-29 | 2007-04-03 | Matsushita Electric Industrial Co., Ltd. | Vertical synchronizing signal generation apparatus and video signal processing apparatus |
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