Method and apparatus for converting scanning line of a video signal receiver
US5404169A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1992 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Dec 4, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A scanning line converting apparatus for converting between NTSC and formats includes a plurality of line memories, an arithmetic circuit and a picture memory. Switches in the lines connecting these elements permits the order of connection to be shifted between first and second states. When converting from the system to the NTSC system, 5 lines are formed by varying the mutual signal ration of 2 lines for every 6 lines, while, when converting from the NTSC system to the system, 6 lines are formed by varying the ratio of 2 lines for every 5 lines, thereby making it possible to convert the lines of one field of different broadcasting methods when actually scanning the picture tube. The ratios used in computations performed by the arithmetic circuit are related to horizontal synchronizing signals and to vertical blanking signals, while they are also related to constants which are furnished by a percent block. A method for converting between different broadcasting formats is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.