Transverse filter circuit
US5371470A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1993 |
| Grant date | Dec 6, 1994 |
| Priority date | — |
| Expiry date | Mar 4, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/71
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transverse filler for use in a CCD camera eliminates KTC noise even at very fast pixel rates with relatively relaxed constraints on component accuracy and timing control, The circuit includes summation, divider and subtraction circuits which add the plural outputs of a tapped delay line to which a video signal is applied and generate average KTC noise and KTC noise plus signal representations. The output of the circuits is applied to the input of an capacitor and the output of the capacitor is connected to an electronic switch and to a Sample-and-Hold amplifier. The capacitor is operative to subtract the average KTC noise from the average KTC plus Video signal, The circuit is able to run on-board binning and does not have pixel feedthrough problems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.