Title:
AUTOMATIC EQUALIZATION OF VIDEO SIGNALS
Document Type and Number:
WIPO Patent Application WO2003071804
Kind Code:
B1
Abstract:
This invention is a video compensation system for analog video transmission. 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 (Vl, Vm, Vh), which is applied to an equalizer system (50-54). In an alternative embodiment, 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.
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Inventors:
AHERN STEPHEN M
GOREY AENGUS
GOREY AENGUS
Application Number:
PCT/US2003/004707
Publication Date:
February 19, 2004
Filing Date:
February 19, 2003
Export Citation:
Assignee:
AVOCENT CORP (US)
International Classes:
H04N5/268; H04N7/10; H04B3/10; (IPC1-7): H04N7/173
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