Brightness clamping apparatus for TV receiver with multiple inputs
US4663668A · kind A · utility
10Cited by
2References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1986 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Jun 12, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/641
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television receiver is arranged to selectively display images from several input signal sources--such as pix-in-pix, teletext, computer graphics, besides displaying pictures from the normal off-the-air television signal. In accordance with this invention, clamping circuits are provided for establishing a constant black image reference level for all the input signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.