Video signal clamping circuit

Details Video signal clamping circuit Video signal clamping circuit

1997-01-30

1998-08-25

Kostak, Victor R.

Television

Image signal processing circuitry specific to television

Brightness control

348691, 348694, H04N 518

Patent

active

057988021

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.

REFERENCES:
patent: 5003564 (1991-03-01), Fling
patent: 5410366 (1995-04-01), Hostetler
patent: 5459526 (1995-10-01), Yamada
patent: 5548343 (1996-08-01), Paquier et al.
German Examination Report, Aug. 16, 1996.

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