GB451663A - Improvements in or relating to television and like systems - Google Patents
Improvements in or relating to television and like systemsInfo
- Publication number
- GB451663A GB451663A GB412735A GB412735A GB451663A GB 451663 A GB451663 A GB 451663A GB 412735 A GB412735 A GB 412735A GB 412735 A GB412735 A GB 412735A GB 451663 A GB451663 A GB 451663A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- cell
- picture
- scene
- amplifier
- 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
- H04N5/16—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)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Closed-Circuit Television Systems (AREA)
- Image Analysis (AREA)
Abstract
451,663. Television. WILSON, J. C., 24, Whitworth Park Mansions, Moss Lane East, Manchester, and BAIRD TELEVISION, Ltd., 58, Victoria Street, Westminster. Feb. 8, 1935, No. 4127. [Class 40 (iii)] The scene 1, Fig. 1, is scanned to generate picture signals in a cell 3 while a cell 6 views a portion 7 of the scene, the signal from the cell 6 being used to control the gain of the picture signal amplifier 9, so that as the general illumination of the scene varies, as the result of variation in the illuminating source, the gain of the amplifier 9 is inversely varied. A further cell 5 may view the scene as a whole to provide a signal proportional to the total light reflected. This signal is used to control the picture signal amplifier 9 so as to maintain the general brightness of the receiver picture irrespective of the picture content. Alternatively, this latter signal may be derived from the output of cell 3. The signals from cells 5, 6 may be applied to a potentiometer 11, 12, Fig. 2, the tappings from which conduct the net correcting signal to the amplifier 9.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB412735A GB451663A (en) | 1935-02-08 | 1935-02-08 | Improvements in or relating to television and like systems |
DEF80677D DE737028C (en) | 1935-02-08 | 1936-02-09 | Television transmission arrangement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB412735A GB451663A (en) | 1935-02-08 | 1935-02-08 | Improvements in or relating to television and like systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB451663A true GB451663A (en) | 1936-08-10 |
Family
ID=9771250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB412735A Expired GB451663A (en) | 1935-02-08 | 1935-02-08 | Improvements in or relating to television and like systems |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE737028C (en) |
GB (1) | GB451663A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE48823E1 (en) * | 2009-05-26 | 2021-11-23 | Shl Medical Ag | Needle cover assembly |
-
1935
- 1935-02-08 GB GB412735A patent/GB451663A/en not_active Expired
-
1936
- 1936-02-09 DE DEF80677D patent/DE737028C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE48823E1 (en) * | 2009-05-26 | 2021-11-23 | Shl Medical Ag | Needle cover assembly |
Also Published As
Publication number | Publication date |
---|---|
DE737028C (en) | 1943-07-03 |
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