Patent ID: 6842195

Claim:
A transforming device for transforming computer graphics signals to television video signals, wherein said transforming device transforms multiple computer vertical lines L of computer graphics signals to multiple TV lines of television video signals and said transforming device contains a first operating mode and a second operating mode, said transforming device comprising: a scaled-down vertical line generating unit for receiving said computer vertical lines and generating multiple scaled-down vertical lines L′(n), L(′n+1), and L′(n+2); a controller for receiving said scaled-down vertical lines from said scaled-down vertical line generating unit; a scaled-down buffer with a initial value of said scaled-down line L′(n), wherein said scaled-down buffer outputs content in said second operating mode and said controller transmits said scaled-down vertical line L′(n+2) to said scaled-down buffer; a weighted-averages operation unit for receiving said content of said scaled-down buffer, wherein said scaled-down buffer transmits said scaled-down line L′(n) to said weighted-averages operation unit in said first operating mode, said controller transmits said scaled-down line L′(n+1) to said weighted-averages operation unit, said weighted-averages operation unit outputs a first value, that is, αL′(n)+βL′(n+1), and said first value is stored to said scaled-down buffer; said weighted-averages operation unit receives said first value transmitted from said scaled-down buffer in said second operating mode, said controller transmits said scaled-down line L′(n+2) to said weighted-averages operation unit, and said weighted-averages operation unit outputs a second value, namely, αL′(n)+βL′(n+1)+γL′(n+2); and an interlacing buffer for connecting said weighted-averages operation unit, wherein said interlacing buffer receives said second value as said output of said transforming device in said second operating mode; wherein α+β+γ=1.