Method and apparatus for increasing the definiton of an NTSC video signal using an augmentation channel
US4965661A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1988 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | Aug 4, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/26
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for increasing the definition of an NTSC video signal using an augmentation channel involves the generation of both a line summation signal as well as a line difference signal. From the line summation signal, a horizontal detail signal may be derived which may be diagonally filtered and added to a diagonally filtered vertical detail signal and transmitted in a bandwidth of approximately 2.5 mega-hertz. Furthermore, the line summation signal may be applied for the derivation of a standard NTSC video signal which is transmitted separately from the augmentation channel. Decoder apparatus comprises a single digital diagonal filter having complimentary output functions resulting in both improved horizontal and vertical resolution at low cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.