Circuit arrangement for accurately adjusting each color channel

Details Circuit arrangement for accurately adjusting each color channel Circuit arrangement for accurately adjusting each color channel

1993-01-27

1994-05-10

Groody, James J.

Television

Image signal processing circuitry specific to television

White limiter

H04N 964, H04N 514

Patent

active

053113004

ABSTRACT:
A circuit arrangement for adaptive white-compression of video signals of a color television apparatus, particularly of a HDTV picture signal generator, which has a signal minimum detector circuit (4, 5, 6) in each color channel. Input color signals (R, G, B) as well as a compressed color signal are applied to these detector circuits, while the smaller of the two input signals can be derived from their outputs. The compressed color signals are generated by digitally controlled multiplier circuits (14, 15, 16). The digital control signal for these multiplier circuits is generated by controlling an up/down counter (24) by a digitized steering signal derived from the video output signals by line-sequential measurement and comparison with a threshold value reference signal.

REFERENCES:
patent: 4470067 (1984-09-01), Mino
patent: 4623924 (1986-11-01), Wargo
patent: 4757373 (1988-07-01), Van Rooy
patent: 4821100 (1989-04-01), Yamamoto
patent: 4837625 (1989-06-01), Douziech

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