JPS6489771A - Channel searching circuit - Google Patents
Channel searching circuitInfo
- Publication number
- JPS6489771A JPS6489771A JP24434687A JP24434687A JPS6489771A JP S6489771 A JPS6489771 A JP S6489771A JP 24434687 A JP24434687 A JP 24434687A JP 24434687 A JP24434687 A JP 24434687A JP S6489771 A JPS6489771 A JP S6489771A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- channel
- generator
- lock
- 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
Abstract
PURPOSE:To change a channel faster by preventing the channel from changing at a constant cycle, writing a necessary video signal into a memory after the output of a phase locked loop(PLL) circuit is phase-locked to an input video signal, and thereafter, immediately providing a means to change channel. CONSTITUTION:The video signal from a video amplifier 6 is supplied to a lock signal generator 21. Further, a regenerative horizontal synchronizing signal form a synchronizing circuit 14 to separate the synchronizing signal from the input video signal is supplied to the lock signal generator 21. A regenerative horizontal synchronizing signal PHL consists of a PLL circuit in the synchronizing circuit 14. The horizontal synchronizing signal induced in the video signal from the video amplifier 6 is decided whether or not it is synchronized with the regenerative synchronizing signal PHL inside the lock signal generator. When a lock condition is decided, a decision output J is supplied to a channel change generator 19. When the decision signal J to indicate the lock condition is inputted, the channel change generator 19 applies a next channel searching signal to a tuner 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24434687A JPS6489771A (en) | 1987-09-30 | 1987-09-30 | Channel searching circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24434687A JPS6489771A (en) | 1987-09-30 | 1987-09-30 | Channel searching circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6489771A true JPS6489771A (en) | 1989-04-04 |
Family
ID=17117334
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24434687A Pending JPS6489771A (en) | 1987-09-30 | 1987-09-30 | Channel searching circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6489771A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5223875A (en) * | 1990-09-06 | 1993-06-29 | Canon Kabushiki Kaisha | Automatic tracking camera system |
-
1987
- 1987-09-30 JP JP24434687A patent/JPS6489771A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5223875A (en) * | 1990-09-06 | 1993-06-29 | Canon Kabushiki Kaisha | Automatic tracking camera system |
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