Progressive scan television receiver with adaptive memory addressing
US4573080A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1984 |
| Grant date | Feb 25, 1986 |
| Priority date | — |
| Expiry date | Jun 28, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/012
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video input signal is stored in a memory and read twice during a line-interval to provide a processed video output signal having a doubled line rate for display on a display device having a doubled horizontal sweep rate thereby providing a progressively scanned image having reduced visibility of line structure. The last address written in memory is used to control the starting time of the second memory read operation. This reduces the tendency of visible artifacts to occur in cases where the video input signal is "non-standard" in the sense that the ratio of the color subcarrier frequency with respect to the line rate is such that the number of color subcarrier cycles per line may be subject to variation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.