Aspect ratio conversion of television display
US5159438A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 26, 1989 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Dec 26, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/642
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television receiver for displaying a 4.times.3 aspect ratio color video signal on a 16.times.9 aspect ratio surface where the digitized luma and chroma signals have a 4:2:2 or a 4:1:1 relationship of Y, R-Y and B-Y samples. A signal having an equal number of luma and chroma samples is developed by generating additional chroma samples by averaging chroma sample values over a group of two (or four for a 4:1:1 signal) successive real values. The luma and chroma samples are compressed by twenty-five percent to form a converted color signal for display. In one version this is accomplished by discarding pixels when writing into a line memory. In another version this is accomplished by reading the pixels out of a line memory at 4/3 the write clock frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.