JPS6451770A - Afc circuit - Google Patents
Afc circuitInfo
- Publication number
- JPS6451770A JPS6451770A JP20817787A JP20817787A JPS6451770A JP S6451770 A JPS6451770 A JP S6451770A JP 20817787 A JP20817787 A JP 20817787A JP 20817787 A JP20817787 A JP 20817787A JP S6451770 A JPS6451770 A JP S6451770A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- horizontal
- synchronizing signal
- horizontal synchronizing
- inputted
- 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
- Synchronizing For Television (AREA)
Abstract
PURPOSE:To perform AFC regardless of the kind of an input video signal by supplying it to a phase detection circuit after varying a duty ratio according to a horizontal synchronization frequency. CONSTITUTION:In a case that a horizontal synchronizing signal to be inputted is of a television video signal, a switch circuit 2 selects a first output terminal 2a, and the switch circuit 7 selects a first integration circuit 9. Thus, the phase detection circuit 4 compares the horizontal synchronizing signal HD to be directly inputted and the phase of the saw tooth output SAW of a reference signal generating part, and impresses the output correction voltage to a horizontal oscillation circuit 11 through the integration circuit 9. On the other hand, in the case that the horizontal synchronizing signal to be inputted is of a personal computer video signal, it switches respective switches 2, 7 to other side, and shapes the pulse width of the horizontal synchronizing signal by a shaping circuit 5 so as to make its duty ratio correspond to the horizontal synchronization frequency. Then, the output correction voltage of the phase detection circuit 4 is impressed to the horizontal oscillation circuit 11 through the second integration circuit 10 so that its frequency is controlled.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20817787A JPS6451770A (en) | 1987-08-24 | 1987-08-24 | Afc circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20817787A JPS6451770A (en) | 1987-08-24 | 1987-08-24 | Afc circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6451770A true JPS6451770A (en) | 1989-02-28 |
Family
ID=16551933
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20817787A Pending JPS6451770A (en) | 1987-08-24 | 1987-08-24 | Afc circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6451770A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8289566B2 (en) | 2000-12-28 | 2012-10-16 | Seiko Epson Corporation | Logo data generating method, data storage medium recording the logo data generating method, a computer program product containing commands executing the steps of the logo data generating logo data generating method, and a logo data generating system |
-
1987
- 1987-08-24 JP JP20817787A patent/JPS6451770A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8289566B2 (en) | 2000-12-28 | 2012-10-16 | Seiko Epson Corporation | Logo data generating method, data storage medium recording the logo data generating method, a computer program product containing commands executing the steps of the logo data generating logo data generating method, and a logo data generating system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS6481407A (en) | Clock signal generating system | |
JPS5741078A (en) | Synchronizing circuit of matrix television | |
JPS5291637A (en) | Frequency conversion system | |
JPS6451770A (en) | Afc circuit | |
CA2020387A1 (en) | Station selecting apparatus | |
EP0280126A3 (en) | Programmable frequency divider and method for generating a low-frequency signal from a high-frequency signal | |
JPS54124633A (en) | Display circuit of television receiver | |
JPS5717237A (en) | Phase synchronizing circuit | |
JPS57140035A (en) | Phase synchronizing oscillation circuit | |
JPS57162552A (en) | Phase synchronizing oscillator of network synchronizing device | |
JPS57201382A (en) | Digital television set | |
JPS6432795A (en) | Television time base correcting device | |
JPS56103582A (en) | Process system of video signal | |
JPS5552687A (en) | Synchronous signal generating device | |
JPS5441615A (en) | Prevention circuit for picture variation | |
JPS5620355A (en) | Clock signal forming circuit | |
KR920003090B1 (en) | Demultiply type synchronization method of power circuit | |
JPS57103419A (en) | Notch rejecting filter | |
JPS6451712A (en) | Clock synchronizing circuit | |
JPS5453901A (en) | Channel selector | |
JPS57190462A (en) | Horizontal deflecting circuit | |
JPS5248917A (en) | Power source unit | |
JPS55162680A (en) | Gate pulse generator | |
JPS5582568A (en) | Afc circuit | |
JPS5683178A (en) | Generating circuit for television vertical deflection signal |