Video signal clamping circuit
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United States of America Patent
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Aug 25, 1998
Grant Date -
N/A
app pub date -
Jan 30, 1997
filing date -
Jan 31, 1996
priority date (Note) -
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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.
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