Method and apparatus for video signal skew compensation
3 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a system and method for correcting the separation of synchronized video signals resulting from transmission over wires of different lengths. Preferably, circuitry is used to inject a signal pulse along the red, green, and blue video signal transmission lines through a selectable delay circuit to a skew compensation circuit located at a user workstation. The skew compensation circuit sums the amplitudes of the received signal pulses and compares the result to a reference amplitude. This is repeated for each possible delay combination of the selectable delay circuits. The skew compensation circuit then determines the delay combination which produces a summed amplitude most closely matching the reference amplitude. This delay combination is implemented in the selectable delay circuits and normal video transmission is allowed to resume such that the red, green, and blue components of the video signal arrive at the video monitor at approximately the same time.
96 Citations
43 Claims
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1-21. -21. (canceled)
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22. A system for providing video signal compensation, said system comprising:
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a video signal compensating circuit for receiving video signal components of a video signal including red, green and blue video signals from a remote video source, determining a skew in receipt of said video signal components, and determining one or more delays to apply one or more of said components; and
a delay circuit coupled to said video signal tuning circuit for applying said delay or said delays said components. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A switching system including circuitry for providing compensation of video signals including red, green and blue components, said system comprising:
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a computer interface device for transmitting test pulses and video signals, said computer interface device including a signal injection circuit for generating said test pulses;
a user interface device coupled to said computer interface device, said user interface device including a signal receiving circuit for receiving said test pulses and said video signals from a remote video source, and a delay circuit for determining a skew in receipt of said video signal components and for determining one or more delays to apply one or more of said components. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A method for compensating for skew introduced during transmission of video signals having red, green and blue components, said method comprising the steps of:
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generating test signals at a computer interface, said signals including one such signal for each of said red, green and blue components;
receiving said test signals at a user interface;
calculating a difference of time in said receiving;
determining a delay for application to one or more of said components;
producing a signal for introducing said delay; and
applying said delays to one or more of said components.
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Specification