Clamp circuit for use in video camera having image pick-up device
US4553169A · kind A · utility
10Cited by
5References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1983 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Dec 21, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/185
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A clamp circuit is disclosed, which clamps the black level of output signal of an image pick-up section with an optical black-detecting portion in the horizontal direction provided in an ineffective picture area corresponding to the horizontal blanking interval of the output signal of the section for each horizontal scanning interval. The pulse width at least one clamp pulse immediately after the vertical blanking interval is made greater than that of the other clamp pulses, within the horizontal blanking interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.