GB535413A - Television video-frequency signal-translating system - Google Patents
Television video-frequency signal-translating systemInfo
- Publication number
- GB535413A GB535413A GB22870/39A GB2287039A GB535413A GB 535413 A GB535413 A GB 535413A GB 22870/39 A GB22870/39 A GB 22870/39A GB 2287039 A GB2287039 A GB 2287039A GB 535413 A GB535413 A GB 535413A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- amplitude
- valves
- amplitude range
- resistance
- 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
- 239000002131 composite material Substances 0.000 abstract 2
- 230000003321 amplification Effects 0.000 abstract 1
- 238000005513 bias potential Methods 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/02—Volume compression or expansion in amplifiers having discharge tubes
- H03G7/04—Volume compression or expansion in amplifiers having discharge tubes incorporating negative feedback
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
- Television Receiver Circuits (AREA)
Abstract
535,413. Television ; valve amplifying circuits. HAZELTINE CORPORATION. Aug. 8, 1939, No. 22870. Convention date, Aug. 31, 1938. [Classes 40 (iii) and 40 (v)] A television video-frequency amplifier with amplitude discrimination for increasing contrast &c. comprises two valves, one repeating the whole of the amplitude range and the other a selected part of the amplitude range, the outputs being combined to develop a composite signal of the required contrast &c. In Fig. 1, the control circuit of valve 21 is connected across the cathode resistance 22 of valve 20, resistance 22 and bias potential 23 being adjustable. Valve 20 repeats the whole amplitude range but potential 23 is adjusted so that only signals above a certain amplitude are repeated by valve 21. Adjustment of resistance 22 controls the negative feed back and also the amplitude of the signal applied to valve 21, these effects opposing each other. In Fig. 3, the signal is applied to the grids of both valves 20a, 21a, an additional opposed battery 27 in the circuit of valve 20a causing this valve to saturate for signals above a certain value. The adjusting-devices of batteries 27, 23a are ganged as shown at U. The composite characteristic of valves 20a, 21a may be such as to increase the amplification of the black or white parts of the picture, or of both black and white relative to the grey parts, while the overall amplitude range remains substantially constant for all adjustments.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US227629A US2247512A (en) | 1938-08-31 | 1938-08-31 | Television video-frequency signaltranslating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB535413A true GB535413A (en) | 1941-04-09 |
Family
ID=22853842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22870/39A Expired GB535413A (en) | 1938-08-31 | 1939-08-08 | Television video-frequency signal-translating system |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2247512A (en) |
| FR (1) | FR859813A (en) |
| GB (1) | GB535413A (en) |
| NL (1) | NL65998C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE956587C (en) * | 1953-06-26 | 1957-01-24 | Fernseh Gmbh | Arrangement for gradation equalization in television broadcasting systems |
| DE1011784B (en) * | 1954-12-08 | 1957-07-04 | Eisenwerke Muelheim Meiderich | Process for observing, monitoring and regulating the melting processes in metallurgical melting or sintering furnaces |
| DE1088534B (en) * | 1956-10-20 | 1960-09-08 | Grundig Max | Gradation regulator for television receivers |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2594870A (en) * | 1945-11-29 | 1952-04-29 | Us Navy | Indicator |
| 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 |
| US2668188A (en) * | 1949-12-19 | 1954-02-02 | Rubert S Naslund | Television gamma test method and apparatus |
-
0
- NL NL65998D patent/NL65998C/xx active
-
1938
- 1938-08-31 US US227629A patent/US2247512A/en not_active Expired - Lifetime
-
1939
- 1939-08-08 GB GB22870/39A patent/GB535413A/en not_active Expired
- 1939-08-31 FR FR859813D patent/FR859813A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE956587C (en) * | 1953-06-26 | 1957-01-24 | Fernseh Gmbh | Arrangement for gradation equalization in television broadcasting systems |
| DE1011784B (en) * | 1954-12-08 | 1957-07-04 | Eisenwerke Muelheim Meiderich | Process for observing, monitoring and regulating the melting processes in metallurgical melting or sintering furnaces |
| DE1088534B (en) * | 1956-10-20 | 1960-09-08 | Grundig Max | Gradation regulator for television receivers |
Also Published As
| Publication number | Publication date |
|---|---|
| NL65998C (en) | |
| FR859813A (en) | 1940-12-30 |
| US2247512A (en) | 1941-07-01 |
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