System of transmitting high-definition television pictures via a relatively narrow passband channel, and also a transmitter and a receiver suitable for the system
US4935813A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1988 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Mar 24, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/28
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for use with D2-MAC/ packets contains, on the one hand, a transmitting part formed by a pick-up member (1) for producing said pictures constituted by a plurality of picture elements or samples distributed over even and odd lines, a filter member (22) for filtering the samples of the filtered samples, a sub-sampling member (20) for taking certain samples from the output of the filter member and a transmission circuit (5) for transmitting through the channel the certain samples taken and, on the other hand, at least one receving part constituted by a receiving circuit (10), an interpolation member (41) for recovering samples on the basis of the certain samples received, and a first display circuit (50) for the recovery of a high-definition picture; the sub-sampling member (20) is designed to take from the pictures supplied by the pick-up member a predetermined number of samples in three consecutive fields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.