JPS56120267A - Corrector for horizontal linearity - Google Patents
Corrector for horizontal linearityInfo
- Publication number
- JPS56120267A JPS56120267A JP2424480A JP2424480A JPS56120267A JP S56120267 A JPS56120267 A JP S56120267A JP 2424480 A JP2424480 A JP 2424480A JP 2424480 A JP2424480 A JP 2424480A JP S56120267 A JPS56120267 A JP S56120267A
- Authority
- JP
- Japan
- Prior art keywords
- fed
- voltage
- horizontal
- parabolic
- period
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
- H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Abstract
PURPOSE:To keep the scanning speed of an electronic beam constant over an entire screen, through dynamic S correction, by applying a parabolic voltage of a horizontal period modulated with a vertical period parabolic waveform to a horizontal deflection coil for correction. CONSTITUTION:When horizontal and vertical blanking pulses are fed to a control circuit 100, a switch 110 is switched to the terminal W, and DC voltage of the power supply 120 is fed to the 1st grid 11 of the picture tube 10. Thus, the horizontal scanning start section is scanned with the beam current having constant and greater value comparatively, and the index signal is picked up from the photodetector 50 and it is fed to a PLL70 to obtain the gate signals GR, GG, GB of three phase and it is fed to the low pass filter 140. The voltage fed to the low pass filter 140 is that the parabolic voltage of horizontal period is modulated with the parabolic waveform of vertical period, and this voltage is fed to the corrective horizontal deflection coil 40. Thus, dynamic S-shape correction is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2424480A JPS56120267A (en) | 1980-02-28 | 1980-02-28 | Corrector for horizontal linearity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2424480A JPS56120267A (en) | 1980-02-28 | 1980-02-28 | Corrector for horizontal linearity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56120267A true JPS56120267A (en) | 1981-09-21 |
| JPS636193B2 JPS636193B2 (en) | 1988-02-08 |
Family
ID=12132828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2424480A Granted JPS56120267A (en) | 1980-02-28 | 1980-02-28 | Corrector for horizontal linearity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56120267A (en) |
-
1980
- 1980-02-28 JP JP2424480A patent/JPS56120267A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS636193B2 (en) | 1988-02-08 |
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