Multiplex color television transmission system
US4027333A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1975 |
| Grant date | May 31, 1977 |
| Priority date | — |
| Expiry date | Dec 9, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/0806
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
System for transmitting and receiving two complete color television pictures from two separate sources in common synchronism wherein the odd-numbered fields of the picture from one of the sources are transmitted in alternation with even-numbered fields of the other of the sources and wherein reception and reconstruction of the two pictures is accomplished by alternately storing the successive odd- and even-numbered fields in a field store having a delay of one field plus or minus half a line and recombining the delayed fields with their respective undelayed fields to recreate the two separate pictures. By utilizing a delay of exactly one field plus or minus half a line (i.e., 262 or 263 lines in the NTSC system), the delayed version of each of the two fields is fully interlaced positionally with its respective undelayed field, with the color subcarrier in exactly the proper phase in the preferred case of a 262 line delay, thereby to facilitate the use of line interpolation to improve the quality of the reproduced pictures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.