Patent · US Expired

Video signal clamping circuit

US5798802A · kind A · utility

12Cited by

4References

20Claims

0Family size

Assignee

Deutsche ITT Industries, GmbH · DE

Inventors

Herbert Elmis · Denzlingen, DE
Heinrich Koehne · Vaterstetten, DE
Herbert Alrutz · Glückstadt, DE
Hermann Zibold · Kenzingen, DE

Key dates

Filing date	Jan 30, 1997
Grant date	Aug 25, 1998
Priority date	—
Expiry date	Jan 30, 2017

Classification

Technology area (CPC H)Electricity
CPC primaryH04N5/18
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A video signal clamping circuit for adapting the DC level of a composite video signal to the processing range of a digital video signal processing device, includes an isolating capacitor in the analog video signal path and a controlled current source which is connected to a floating isolating-capacitor terminal and charges or discharges the isolating capacitor solely by means of a positive or negative clamping current, with the value and sign of the clamping pulses being digitally controlled by a comparator circuit which compares predetermined reference values of the composite video signal with mode-dependent comparison values.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.