GB472401A - Improvements in or relating to television and like systems - Google Patents
Improvements in or relating to television and like systemsInfo
- Publication number
- GB472401A GB472401A GB835836A GB835836A GB472401A GB 472401 A GB472401 A GB 472401A GB 835836 A GB835836 A GB 835836A GB 835836 A GB835836 A GB 835836A GB 472401 A GB472401 A GB 472401A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- grid
- anode
- screening
- flyback
- 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
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/24—Blanking circuits
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
472,401. Valve circuits. BAIRD TELEVISION, Ltd., JONES, V. A., and WILLANS, P. W. March 20, 1936, No. 8358. [Class 40 (v)] To prevent the trans mission of undesirec signals during the flyback periods of ar electronic scanner, a valve 8 is rendered in. operative during those periods, and the generation of a sudden pulse by the cessation of the anode current is prevented. A second valve 9 has its anode so connected to the anode of the valve 8 as to draw anode current through the same load impedance 12, and negative bias is applied to the screening-grid except when the valve 8 is rendered inoperative by a negative pulse applied to its screening-grid. The current passed by the valve 9, when operative, is made dependent on the image signal for black by obtaining the grid bias from a condenser 10, which is charged by the signals through a diode 11. According to a modification, the switching pulses are obtained from a potentiometer including a valve which is blocked during the flyback, and positive impulses are applied to the grid of the second valve. Specification 470,785 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB835836A GB472401A (en) | 1936-03-20 | 1936-03-20 | Improvements in or relating to television and like systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB835836A GB472401A (en) | 1936-03-20 | 1936-03-20 | Improvements in or relating to television and like systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB472401A true GB472401A (en) | 1937-09-20 |
Family
ID=9850989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB835836A Expired GB472401A (en) | 1936-03-20 | 1936-03-20 | Improvements in or relating to television and like systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB472401A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2485310A (en) * | 1946-12-12 | 1949-10-18 | Du Mont Allen B Lab Inc | Video black clipper |
-
1936
- 1936-03-20 GB GB835836A patent/GB472401A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2485310A (en) * | 1946-12-12 | 1949-10-18 | Du Mont Allen B Lab Inc | Video black clipper |
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