GB420727A - Improvements in or relating to television and like systems - Google Patents
Improvements in or relating to television and like systemsInfo
- Publication number
- GB420727A GB420727A GB34273/33A GB3427333A GB420727A GB 420727 A GB420727 A GB 420727A GB 34273/33 A GB34273/33 A GB 34273/33A GB 3427333 A GB3427333 A GB 3427333A GB 420727 A GB420727 A GB 420727A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- grid
- rectifier
- dec
- television
- 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
- 230000001105 regulatory effect Effects 0.000 abstract 2
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
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
420,727. Television; valve amplifying circuits. FERNSEH AKT.-GES., Goerzallee, Zehlendorf, Berlin. Dec. 6, 1933, No. 34273. Convention date, Dec. 6, 1932. [Classes 40 (iii) and 40 (v)] A correct mean brightness of a reproduced picture, relative to the brightest and darkest tones is maintained automatically. The mean brightness of a light source or relay 11 is regulated by automatically regulating the grid bias of the valve 10 feeding the source by a voltage derived from a previous valve 4 amplifying the received signals. The output of this valve passes through a rectifier 14 to develop a potential on the grid of an extra valve 19 and thus vary its anode current. The anode circuit contains a resistance 21 which also lies in the grid circuit of the valve 10. The rectifier is associated with a leaky condenser 18, 17 with a time constant such that variations in the mean value of the signal are not operative until they have lasted for a small plurality of pictures.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE420727X | 1932-12-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB420727A true GB420727A (en) | 1934-12-06 |
Family
ID=6453484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB34273/33A Expired GB420727A (en) | 1932-12-06 | 1933-12-06 | Improvements in or relating to television and like systems |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR764998A (en) |
GB (1) | GB420727A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE753789C (en) * | 1935-03-09 | 1952-11-17 | Siemens & Halske A G | Circuit arrangement for influencing the settling and decay times of an electrical circuit |
-
1933
- 1933-12-04 FR FR764998D patent/FR764998A/en not_active Expired
- 1933-12-06 GB GB34273/33A patent/GB420727A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR764998A (en) | 1934-05-31 |
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