Computer graphics processing and selective visual display system – Display driving control circuitry
Reexamination Certificate
2006-01-19
2009-06-23
Shankar, Vijay (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
C345S212000, C345S213000, C345S215000
Reexamination Certificate
active
07551168
ABSTRACT:
A video compensation system for analog video transmission is described. The compensation system is employed in an analog video switching circuit such that each time a conductive path is switched, the system automatically tests the new switch path for a new compensation value. The compensation value is determined by measuring the response of the new path to a set of tones that are applied to the conductive path, the response to which is measured against a table of responses previously recorded. The measured responses are compared to the recorded responses to determine an appropriate compensation control voltage, which is applied to an equalizer system. In an alternative embodiment, the skew compensations also provided between red, green, and blue twisted pair lines in the cables by performing comparative analysis between corresponding pairs of the red, green, and blue signals.
REFERENCES:
patent: 5251018 (1993-10-01), Jang et al.
patent: 5731706 (1998-03-01), Koeman et al.
patent: 5844940 (1998-12-01), Goodson et al.
patent: 5870429 (1999-02-01), Moran et al.
patent: 5967853 (1999-10-01), Hashim
patent: 5997358 (1999-12-01), Adriaenssens et al.
patent: 6060890 (2000-05-01), Tsinker
patent: 6240554 (2001-05-01), Fenouil
patent: 6345323 (2002-02-01), Beasley et al.
patent: 6370191 (2002-04-01), Mahant-Shetti et al.
patent: 6567464 (2003-05-01), Hamdi
patent: 6571393 (2003-05-01), Ko et al.
patent: 6590930 (2003-07-01), Greiss
patent: 6972786 (2005-12-01), Ludwig
patent: 7221389 (2007-05-01), Ahern et al.
patent: 2001/0048667 (2001-12-01), Hamdi
patent: 2006/0262226 (2006-11-01), Odryna et al.
patent: 62-077935 (1987-10-01), None
patent: 09-321672 (1997-12-01), None
International Search Report relating to PCT/US03/04707 dated Jul. 11, 2003.
International Preliminary Examination Report in corresponding PCT application PCT/US2003/04707, mailed Oct. 1, 2004.
Malaysian Search Report in corresponding Malaysian application PI20030508, mailed Mar. 6, 2007, Malaysian filing date Feb. 14, 2003.
PCT Written Opinion in corresponding PCT application PCT/US2003/04707, mailed Mar. 4, 2004.
Official Action mailed Feb. 6, 2008 in Japanese Application No. 2003-570573 [with English translation].
Ahern Stephen M.
Gorey Aengus
Avocent Corporation
Davidson Berquist Jackson & Gowdey LLP
Shankar Vijay
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