High definition television augmentation channel
US4890283A · kind A · utility
23Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1987 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Nov 19, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4382
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
High transmission and reception quality is achieved in a high definition television system, with minimum intra-channel interference, by digitally encoding the enhancement information and employing spread-spectrum modulation techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.