US 7,065,190 B2Granted

Method of encoding and decoding computer video signals for transmission over a twisted pair cable

OwnerJack Gershfeldinventor

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Abstract

A method of encoding and decoding computer video signals for transmission over a twisted pair cable is disclosed. Vertical and horizontal sync components of a video signal are converted into narrow vertical and horizontal sync components having the pulse width of 20 nanoseconds. Narrow vertical and horizontal sync components are then combined with red and green components. After transmission via a twisted pair cable, narrow vertical and horizontal sync components are extracted from red and green components and converted back into vertical and horizontal sync components. Even though the red and green components also comprise narrow sync signals, the narrow sync signals will not be detected by the detection circuits and presence of such narrow sync components in the red and green components will not interfere with the quality of the picture displayed on the display device.

Claims8

Dependent claims

A method of encoding and decoding computer video signals for transmission over a twisted pair cable, comprising the steps of:

(a) providing a computer video signal comprising red, green, blue, vertical sync and horizontal sync components;
(b) converting the vertical sync component into a narrow vertical sync component;
(c) combining the narrow vertical sync component with the red component, thereby generating a combined red narrow vertical sync component;
(d) converting the horizontal sync component into a narrow horizontal sync component;
(e) combining the narrow horizontal sync component with the green component, thereby generating a combined green narrow horizontal sync component;
(f) transmitting the combined red narrow vertical sync, combined green narrow horizontal sync and blue components via a twisted pair cable such that one pair of conductors is used for transmission of each of the components, thereby utilizing only three pairs of conductors;
(g) extracting the narrow vertical sync component from the combined red narrow vertical sync component without removing the narrow vertical sync component from the combined red narrow vertical sync component;
(h) converting the narrow vertical sync component into the vertical sync component;
(i) extracting the narrow horizontal sync component from the combined green narrow horizontal sync component without removing the narrow horizontal sync component from the combined green narrow horizontal sync component;
(j) converting the narrow horizontal sync component into the horizontal sync component;
(k) receiving the computer video signal comprising the combined red narrow vertical sync, combined green narrow horizontal sync, blue, vertical sync and horizontal sync components.

8 more elements

A method of encoding and decoding computer video signals for transmission over a twisted pair cable, comprising the steps of:

(l) providing a computer video signal comprising red, green, blue, vertical sync and horizontal sync components;
(m) converting the horizontal sync component into a narrow horizontal sync component;
(n) converting the vertical sync component into a narrow vertical sync component having a pulse width different from that of the narrow horizontal sync component;
(o) combining the narrow horizontal sync component with the narrow vertical sync component thereby generating a combined narrow horizontal sync narrow vertical sync component;
(
p) combining the combined narrow horizontal sync narrow vertical sync component with the green component thereby generating a combined green narrow horizontal sync narrow vertical sync component;
(q) transmitting the red, combined green narrow horizontal sync narrow vertical sync and blue components via a twisted pair cable such that one pair of conductors is used for transmission of each of the components, thereby utilizing only three pairs of conductors;
(r) extracting the combined narrow horizontal sync narrow vertical sync component from the combined green narrow horizontal sync narrow vertical sync component without removing the combined narrow horizontal sync narrow vertical sync component from the combined green narrow horizontal sync narrow vertical sync component;
(s) separating the narrow horizontal sync component from the narrow vertical sync component;
(t) converting the narrow horizontal sync component into the horizontal sync component;
(u) converting the narrow vertical sync component into the vertical sync component;
(v) receiving the computer video signal comprising the red, combined green narrow horizontal sync narrow vertical sync, horizontal sync, vertical sync and blue components.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/435,245Filed 12 May 2003
Published: US 2004/0228459 A118 Nov 2004
Granted: 20 Jun 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04N 11/06
Colour television systems: transmission systems characterised by the manner in which the individual colour picture signal components are combined
G09G 5/006
Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto: details of…
H04N 7/108
Adaptations for transmission by electrical cable: the cable being constituted by a pair of wires
H04N
Pictorial communication