GB573274A - Keystone correction circuit for television apparatus - Google Patents
Keystone correction circuit for television apparatusInfo
- Publication number
- GB573274A GB573274A GB12749/43A GB1274943A GB573274A GB 573274 A GB573274 A GB 573274A GB 12749/43 A GB12749/43 A GB 12749/43A GB 1274943 A GB1274943 A GB 1274943A GB 573274 A GB573274 A GB 573274A
- Authority
- GB
- United Kingdom
- Prior art keywords
- scanning
- fed
- choke
- waves
- line
- 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.)
- Expired
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
-
- 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
- H04N3/237—Distortion correction, e.g. for pincushion distortion correction, S-correction using passive elements, e.g. diodes
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
573,274. Television; electronic scanning. FARNSWORTH TELEVISION & RADIO CORPORATION. Aug. 6, 1943, No. 12749. Convention date, April 30, 1942. [Class 40 (iii)] In a television scanning circuit in which the line-scanning wave is modulated in accordance with the varying amplitude of the field-scanning wave for correcting keystone distortion, the modulator 20 comprises two valves 25, 26 connected in push-pull, the grids of the valves being fed with line-scanning waves of equal amplitude, but of opposite polarity, the anodes being fed in parallel over lead 46 with the fieldscanning waves and the cathodes beingcorinected through a balanced choke 35. The two opposing windings of the choke lie side by side and close together and the mid-point is connected to ground through a resistance 29 and condenser 28, the choke and its connections serving to remove from the modulated linescanning wave the fundamental and higherorder frequencies of the field-scanning wave. The modulated line-scanning wave is fed from the choke 35 through an amplifier 38 to the deflecting coils 42 of the cathode-ray tube 40. The line-deflecting saw-tooth waves of opposite polarity supplied to the modulator 20 over leads 16, 17 are generated by two similar condenser resistance timing circuits 7, 8 ; 12, 13 connected respectively to the anode and cathode of a valve 10, the grid of which is fed with square-topped waves from a generator 2. Specification 573,272 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US441205A US2369824A (en) | 1942-04-30 | 1942-04-30 | Keystone correction circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
GB573274A true GB573274A (en) | 1945-11-14 |
Family
ID=23751957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12749/43A Expired GB573274A (en) | 1942-04-30 | 1943-08-06 | Keystone correction circuit for television apparatus |
Country Status (2)
Country | Link |
---|---|
US (1) | US2369824A (en) |
GB (1) | GB573274A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL244814A (en) * | 1958-10-29 |
-
1942
- 1942-04-30 US US441205A patent/US2369824A/en not_active Expired - Lifetime
-
1943
- 1943-08-06 GB GB12749/43A patent/GB573274A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2369824A (en) | 1945-02-20 |
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