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Color graphics processor

  • US 6,043,811 A
  • Filed: 06/25/1999
  • Issued: 03/28/2000
  • Est. Priority Date: 02/10/1997
  • Status: Expired due to Term
First Claim
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1. A color video encoder for converting color information including hue, saturation and luminance, and timing information including a sync signal to a video signal conforming to NTSC and/or PAL standard, comprising:

  • a clock generator for generating a clock signal having a constant frequency, said constant frequency being the frequency of a sub-carrier wave scaled by a rational number;

    a luminosity signal generator for generating a digital luminosity signal;

    a saturation signal generator for generating a digital saturation signal;

    a hue signal generator for generating a digital hue signal;

    a sub-carrier phase generator for generating a digital sub-carrier phase signal that represents the phase angle of said sub-carrier wave according to said clock signal;

    a sync signal generator for generating a sync signal, a color burst flag signal and a line alternate signal;

    a sync multiplexer for multiplexing said digital luminosity signal with said sync signal and generating a multiplexed digital luminosity signal;

    a color burst multiplexer for generating a digital color burst phase signal and a digital color burst amplitude signal, multiplexing said digital hue signal with said digital color burst phase signal according to said color burst flag signal for generating a multiplexed digital hue signal, and multiplexing said digital saturation signal with said digital color burst amplitude signal according to said color burst flag signal for generating a multiplexed digital saturation signal;

    a hue reverse means for reversing the color phase of said multiplexed digital hue signal according to said line alternate signal; and

    a phase modulator for phase-modulating said digital sub-carrier phase signal by said multiplexed digital hue signal and generating a modulated digital phase signal;

    a phase-to-amplitude converter for converting said modulated digital phase signal to a modulated digital amplitude signal;

    an amplitude modulator for amplitude-modulating said modulated digital amplitude signal by said multiplexed digital saturation signal for generating a digital chromaticity signal; and

    a luminosity-chromaticity mixer for mixing multiplexed digital luminosity signal and said digital chromaticity signal for generating a digital video composite signal.

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