System and method for generating NTSC and PAL formatted video in a computer system
US5812204A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1996 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | Jul 25, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for generating NTSC and formatted composite video signals in a computer. Digital pixel data may be processed by software to form component video pixel data, which may include luminance and chrominance components. A chrominance look-up table is provided in a display memory and is used for modulation of the chrominance components in accordance with NTSC and/or formats. The modulated components are then combined to form digital composite video pixel data which may be stored in a frame buffer in the display memory. Alternatively, a pixel clock frequency equal to an integer multiple of the carrier frequency may be used and modulation in accordance with the NTSC and formats may be accomplished by inverting, setting to zero or leaving unmodified the chrominance components. The architecture of this system greatly reduces hardware complexity and bandwidth requirements. In addition, the process may be controlled by a media stream controller which is also adapted for audio and graphics processing. This allows the display memory and various other components to be shared by multiple media subsystems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.