Digital video modulation and demodulation system
US3993861A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 24, 1975 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Mar 24, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/0675
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a television system, a digital video system permits the transmission of data along with the usual television picture. The television picture field includes one or more selectively addressable areas and the data is imprissed on these areas as digital, binary-coded brightness modulations at rates greater than the vertical field rate. At the receiving end of the system, the viewer positions one or more light sensors opposite these screen areas. The light sensors respond to the binary-coded brightness modulations by developing corresponding binary-coded digital electrical signals. The data stream from a light sensor can then be decoded by a demodulator/decoder operated by the viewer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.