Converter to convert a computer graphics signal to an interlaced video signal
US5455628A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1993 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Sep 16, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/641
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A converter receives a computer graphics signal from a PC and provides from it a video signal for display or recording. Analogue RGB signals are digitised and applied to a vertical filter and rate buffer. The rate buffer needs only one to three lines of storage capacity. The received graphics signal is a VGA 640.times.480 non-interlaced mode signal, and the rate buffer halves the line rate and produces an interlaced output. Such a signal can be treated as a video signal, after reconversion to analogue form. The vertical filter provides a degree of vertical averaging to remove flicker. In a preferred store using three line-store FIFOs, input lines are applied to them in the sequence A,B,C,B,A, and so on.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.