GB503207A - Circuit arrangement for current or potential distortion in television systems - Google Patents
Circuit arrangement for current or potential distortion in television systemsInfo
- Publication number
- GB503207A GB503207A GB26660/37A GB2666037A GB503207A GB 503207 A GB503207 A GB 503207A GB 26660/37 A GB26660/37 A GB 26660/37A GB 2666037 A GB2666037 A GB 2666037A GB 503207 A GB503207 A GB 503207A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- anode
- curve
- resistance
- valve
- 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
- 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)
- Transforming Electric Information Into Light Information (AREA)
Abstract
503,207. Valve circuits. RADIOAKT.-GES. D. S. LOEWE. Oct. 1, 1937, No. 26660. Convention date, Oct. 2, 1936. Addition to 487,243. [Classes 40 (iii) and 40 (v)] Desired current-voltage characteristics are obtained by the combination of a plurality of resistances in such a manner that the characteristic curve of each resistance forms part of the complete characteristic. In the described arrangement, the curve 1-2-3, Fig. 1a, which is used for increasing the light intensity contrast in television systems as described in the parent Specification, is obtained by means of tubes 4, 5, 6, Fig. 2. The input potential is applied at 7 and the total current flowing through resistance 8 produces the output at 11. Valves 4, 5, with suitable anode and bias voltages pass currents i1, i2, represented by portions 1a-2a, 2b-3b, of their anode current-anode voltage. characteristics, which add to produce curve 1a-2a-3a, Fig. 1b. A constant current i3 passed by valve 6 operating as a saturated valve is substracted and the resultant current through resistance 8 is given by curve 1-2-3. In modifications, Figs. 3, 4 (not shown) the constant current i3 is supplied by a D.C. source and variable resistance and the various anode and grid voltages are obtained by tappings on a common current source. The valves 4, 5, are also shown combined in one tube having an anode, a cathode and two grids. The Specification as open to inspection under Sect. 91 comprises also the subject-matter of Specification 505,167. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEL7403D DE1033703B (en) | 1936-10-02 | 1936-10-02 | Circuit arrangement for the transmission of television pictures with equalization means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB503207A true GB503207A (en) | 1939-04-03 |
Family
ID=7257244
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3119/39A Expired GB505167A (en) | 1936-10-02 | 1937-10-01 | Improvements in or relating to television transmission |
| GB26660/37A Expired GB503207A (en) | 1936-10-02 | 1937-10-01 | Circuit arrangement for current or potential distortion in television systems |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3119/39A Expired GB505167A (en) | 1936-10-02 | 1937-10-01 | Improvements in or relating to television transmission |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2248563A (en) |
| DE (1) | DE1033703B (en) |
| FR (1) | FR827371A (en) |
| GB (2) | GB505167A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2763838A (en) * | 1945-09-14 | 1956-09-18 | Robert A Mcconnell | Circuit for obtaining the ratio of two voltages |
| US2764680A (en) * | 1946-01-10 | 1956-09-25 | Robert M Walker | Electron tube limiter circuit |
| GB702321A (en) * | 1949-07-21 | 1954-01-13 | Emi Ltd | Improvements relating to non-linear electrical control circuits |
| CA556448A (en) * | 1949-09-27 | 1958-04-22 | L. Harder Edwin | Adjustable non-linear resistance |
| US2831107A (en) * | 1951-07-26 | 1958-04-15 | Electronique & Automatisme Sa | Electric simulators of arbitrary functions |
| US3708693A (en) * | 1971-05-19 | 1973-01-02 | Ferrex Corp | Gamma corrector |
-
1936
- 1936-10-02 DE DEL7403D patent/DE1033703B/en active Pending
-
1937
- 1937-09-28 US US166233A patent/US2248563A/en not_active Expired - Lifetime
- 1937-09-30 FR FR827371D patent/FR827371A/en not_active Expired
- 1937-10-01 GB GB3119/39A patent/GB505167A/en not_active Expired
- 1937-10-01 GB GB26660/37A patent/GB503207A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2248563A (en) | 1941-07-08 |
| FR827371A (en) | 1938-04-25 |
| GB505167A (en) | 1939-05-01 |
| DE1033703B (en) | 1958-07-10 |
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