Interface circuit for a video camera
US6191816A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 1997 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Dec 11, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/185
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to an interface circuit FE intended to receive a pseudo-periodical input signal Vin having a reference level and a video level, and to supply a signal Vs having a level which is representative of the difference between the reference level and the video level, said interface circuit comprising: PA1 two sampling branches BR1 and BR2 simultaneously supplying the reference level and the video level, and PA1 a subtracter SUB having inputs which receive the outputs of the branches BR1 and BR2. According to the invention, the inputs of the branches BR1 and BR2 are jointly connected via a first capacitance C1 to the input of the interface circuit FE, which comprises control means CM allowing adjustment of the values of the signals at the inputs of the subtracter SUB so that they are equal when they are representative of one and the same reference level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.