JPS57104372A - Horizontal afc circuit - Google Patents
Horizontal afc circuitInfo
- Publication number
- JPS57104372A JPS57104372A JP18040280A JP18040280A JPS57104372A JP S57104372 A JPS57104372 A JP S57104372A JP 18040280 A JP18040280 A JP 18040280A JP 18040280 A JP18040280 A JP 18040280A JP S57104372 A JPS57104372 A JP S57104372A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pulse
- phase
- signal
- horizontal
- 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
- 230000006866 deterioration Effects 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 abstract 1
- 230000003111 delayed effect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Synchronizing For Television (AREA)
Abstract
PURPOSE:To prevent deterioration of screen and to achieve stable operation, by correcting the phase of a horizontal synchronizing signal being a reference signal at a phase correction circuit and applying the synchronizing signal shifted for the phase to a phase detection circuit. CONSTITUTION:A reference signal (synchronizing signal) at an input terminal 2 of a horizontal deflection circuit is a waveform (b) via an integration circuit consisting of a resiter 12 and a capacitor 13, a transistor 14 is switched and a pulse (c) with broader width in which the center time is delayed by DELTAphi from the center of the reference signal (a) at the collector is obtained. On the other hand, a flyback pulse of a horizontal output circuit 6 is integrated with a comparison signal. The generating circuit 7 and added to an AFC circuit as a comparison signal. The horizontal AFC circuit 1 acts so that the pulse is compared with a comparison signal at the center time of the pulse (c) to change the phase of screen. Thus, the deterioration of screen due to pulse harmonics caused as conventional methods can be prevented, noise included in the reference signal is rejected and the operation of the AFC circuit can be made stable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18040280A JPS57104372A (en) | 1980-12-22 | 1980-12-22 | Horizontal afc circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18040280A JPS57104372A (en) | 1980-12-22 | 1980-12-22 | Horizontal afc circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57104372A true JPS57104372A (en) | 1982-06-29 |
Family
ID=16082608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18040280A Pending JPS57104372A (en) | 1980-12-22 | 1980-12-22 | Horizontal afc circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57104372A (en) |
-
1980
- 1980-12-22 JP JP18040280A patent/JPS57104372A/en active Pending
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