Television – Format conversion – Progressive to interlace
Reexamination Certificate
2005-12-13
2005-12-13
Lee, Michael H. (Department: 2614)
Television
Format conversion
Progressive to interlace
C348S447000, C345S603000
Reexamination Certificate
active
06975362
ABSTRACT:
A VGA to analog video converter is useful e.g. for displaying video and/or graphics data from a computer onto a large screen television or television monitor. The RGB video signals output from the personal computer are first converted to digital form. The analog-to-digital converter which does this is clocked by a clock signal generated by a phase-locked loop using the horizontal synchronizing signal from the personal computer. The digital RGB signals are then converted to a YCbCR format. A flicker filter eliminates the flickering appearing on the TV monitor by operating on the luminance (Y) component. The YCbCr signals are encoded into NTSC or PAL Standard, and output in composite analog video or S-VHS format. A color subcarrier synthesizer generates the color subcarrier signal to generate an accurate subcarrier frequency for the video output signals. An analog-to-digital clock phase adjustment is used to ensure that the input RGB signals are sampled at the proper instant by the analog-to-digital converters.
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Raytheon data sheet,TMC2360 Video Output Processor VGA to NTSC/PAL, Raytheon Electronics Semiconductor Division, 1996, 24 pages.
Bucklen Willard K.
Hsu De Dzwo
Sani Mehdi H.
Fairchild Semiconductor Corporation
Lee Michael H.
Sidley Austin Brown & Wood LLP
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