Two-level picture signal transmission system
US3973079A · kind A · utility
4Cited by
3References
8Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 9, 1974 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Dec 9, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4135
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a transmission system in which two-level picture signal is divided into blocks, each having a predetermined number of picture elements, the pieces of signal contained in the respective blocks are converted to a predetermined number of codes, and the codes are converted to modulated signals having different levels or phase, the modulator circuit is so designed that any two modulated signals causing the shifting of the contour of picture may be converted to two signals having adjacent levels or phases, so as to minimize the degradation of the quality of the reproduced picture due to code errors caused during transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.