GB538947A - Improvements in television signal-translating systems - Google Patents
Improvements in television signal-translating systemsInfo
- Publication number
- GB538947A GB538947A GB32445/39A GB3244539A GB538947A GB 538947 A GB538947 A GB 538947A GB 32445/39 A GB32445/39 A GB 32445/39A GB 3244539 A GB3244539 A GB 3244539A GB 538947 A GB538947 A GB 538947A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- valve
- accordance
- signal
- grids
- 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
- 230000003321 amplification Effects 0.000 abstract 1
- 238000005286 illumination Methods 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 239000013589 supplement Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
- H04N5/202—Gamma control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
- H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
538,947. Television ; valve amplifying circuits. HAZELTINE CORPORATION. Dec. 18, 1939, Nos. 32445 and 32446. Convention dates, Jan. 14 and Jan. 27. [Classes 40 (iii) and 40 (v)] The contrast or gamma of .a television receiver is automatically varied in accordance with (1) the instantaneous value of the signal, e.g. by feeding the signals to two grids of the same valve, or (2) the general brightness of the subject or average intensity of the signal. Signals derived from different points of a potentiometer 22 following the video-frequency amplifier 16 are fed through amplifiers 23, 30 to the first and third grids of the valve 21, diodes 24, 31 deriving bias voltages equal to the peak value of the signal to supplement the fixed bias.voltages and representing the uni-directional background illumination components. The non- linear amplification of the signals in accordance with their instantaneous values constitutes an automatic gamma control. This control may be varied in accordance with the average intensity of the signals by applying to the grid of valve 30 a further biasing voltage derived by the rectifier 38 receiving part of the video signals.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US250914A US2255691A (en) | 1939-01-14 | 1939-01-14 | Television signal-translating system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB538947A true GB538947A (en) | 1941-08-22 |
Family
ID=22949682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB32445/39A Expired GB538947A (en) | 1939-01-14 | 1939-12-18 | Improvements in television signal-translating systems |
Country Status (4)
Country | Link |
---|---|
US (1) | US2255691A (en) |
BE (1) | BE437358A (en) |
FR (1) | FR862876A (en) |
GB (1) | GB538947A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE955779C (en) * | 1952-05-07 | 1957-01-10 | Philips Nv | Circuit arrangement for regulating the gradation of an image signal |
US4799106A (en) * | 1985-08-22 | 1989-01-17 | Rank Pullin Controls Limited | Controlling image signals in an imaging apparatus |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2594870A (en) * | 1945-11-29 | 1952-04-29 | Us Navy | Indicator |
US2548436A (en) * | 1946-01-25 | 1951-04-10 | Hazeltine Corp | Television receiver background control circuit |
US2519238A (en) * | 1947-04-05 | 1950-08-15 | Rca Corp | Biased diode wave shaping circuit |
US2552588A (en) * | 1947-04-26 | 1951-05-15 | Columbia Broadeasting System I | Gamma control circuit |
US2692299A (en) * | 1948-12-11 | 1954-10-19 | Westinghouse Electric Corp | Image contrast intensifier |
US2569297A (en) * | 1948-12-16 | 1951-09-25 | Rca Corp | Direct-current restoring apparatus |
US2740071A (en) * | 1950-05-11 | 1956-03-27 | Columbia Broadcasting Syst Inc | Television |
US2760008A (en) * | 1950-08-30 | 1956-08-21 | Rca Corp | Amplifier having controllable signal expansion and compression characteristics |
FR2117909B1 (en) * | 1970-12-16 | 1976-12-03 | Fernseh Gmbh | |
JPS56107674A (en) * | 1980-01-31 | 1981-08-26 | Sony Corp | Gradation correcting device of video signal |
JPS627290A (en) * | 1985-07-04 | 1987-01-14 | Fuji Photo Film Co Ltd | Gradient correction for color negative film picking up image and its device |
-
0
- BE BE437358D patent/BE437358A/xx unknown
-
1939
- 1939-01-14 US US250914A patent/US2255691A/en not_active Expired - Lifetime
- 1939-12-18 GB GB32445/39A patent/GB538947A/en not_active Expired
-
1940
- 1940-01-13 FR FR862876D patent/FR862876A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE955779C (en) * | 1952-05-07 | 1957-01-10 | Philips Nv | Circuit arrangement for regulating the gradation of an image signal |
US4799106A (en) * | 1985-08-22 | 1989-01-17 | Rank Pullin Controls Limited | Controlling image signals in an imaging apparatus |
Also Published As
Publication number | Publication date |
---|---|
BE437358A (en) | |
US2255691A (en) | 1941-09-09 |
FR862876A (en) | 1941-03-18 |
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