Video communication system and phase or frequency modulator included therein
US4945404A · kind A · utility
79Cited by
5References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 6, 1988 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | May 6, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4382
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video communication system for transmitting still pictures of a scene during periodic intervals comprises a T.V. camera producing video analog signals of the scene to be transmitted, an analog-to-digital converter converting the video analog signals to pixel digital signals representing the gray level of each pixel in the scene, a memory for storing the pixel gray levels, and a phase modulator for modulating a carrier wave by the pixel gray levels from the memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.