Digital encoding system
US4009486A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1975 |
| Grant date | Feb 22, 1977 |
| Priority date | — |
| Expiry date | Aug 20, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/046
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for the conversion to and from digital form of a color television signal is described in which the digital signals represent the error between a particular sampled value of the signal and a predicted value for that particular sample, the predicted value being based on a previously occurring sampled value together with the difference between two similarly spaced sampled values occurring in the preceding line, the spacing of the two pairs of sampled values in the two lines being such that the phase change of the sub-carrier, if unmodulated, is the same in both cases. A simple switch delay system is described for effecting the selection of the sampling instants in the preceding line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.