Encoded video television graphics system
US4707731A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1986 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Apr 3, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/74
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television graphics system comprises an analog-to-digital converter for digitizing an encoded analog input video signal and generating an encoded digital signal representative of the magnitude of the encoded analog input video signal at a succession of sampling points, a memory device, and a device for writing the encoded digital signal into the memory device. The graphics system also comprises a computer connected to read the encoded digital signal from the memory device, and an arithmetic unit for decoding the encoded digital signal so as to provide decoded digital signals representative of the magnitudes of the luminance and chrominance components of the analog input video signal. The computer is used to modify at least one of the decoded digital signals, and the arithmetic unit encodes the modified digital signal to generate a modified encoded digital signal representative of a modified form of the picture. The modified encoded digital signal is then written into the memory device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.