Digital clamp circuit for clamping based on the level of an optical black period of a picture signal
US5343245A · kind A · utility
2Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1992 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Dec 7, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/165
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital clamp circuit obtains a variation value of the black level varying per 1H period according to a predetermined clamp reference value, adds the variable value to an entire signal level to perform compensation of the variation of the black level, thereby enabling stable signal processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.