Television systems
US4051531A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 1973 |
| Grant date | Sep 27, 1977 |
| Priority date | — |
| Expiry date | Jun 4, 1993 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Video input signals of a field of a first line standard are converted to a second line standard, having a reduced number of lines, via an intermediate line standard. The input signals are passed through one or more delay devices so that the picture information in corresponding parts of adjacent lines is available at any instant. By interpolation of this information there are produced lines of an intermediate standard which are stored. The intermediate standard contains the same number of lines as the first but the interpolated information is contained in the number of lines of the second standard. The excess lines of the intermediate standard may be blank. Output signals of the second standard are obtained by reading-out only the wanted lines of the intermediate standard. In a modification, where the second standard has more lines than the first, lines are added when reading-out the intermediate standard. The apparatus is preferably of the digital type for all steps of the conversion. The novel use of digital shift registers as delay devices and storage devices is especially convenient and economic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.