Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Reexamination Certificate
2006-06-20
2006-06-20
Woo, Stella (Department: 2643)
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
C379S093170
Reexamination Certificate
active
07065190
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.
REFERENCES:
patent: 4651232 (1987-03-01), Lemoine et al.
patent: 6345323 (2002-02-01), Beasley et al.
patent: 6618774 (2003-09-01), Dickens et al.
Khiterer Vladimir
Woo Stella
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