Patent ID: 6043811
Filing Date: 2000-03-28
Classification: G09G

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