Digital video encoder circuit

A digital video encoder circuit comprising:

• input means for receiving digital color information data to be encoded, the digital color information data including a plurality of color components and a luminance component having a predetermined relationship therewith;
• decoding means for receiving the digital color information data from said input means and decoding the digital color information data into a predetermined number of pieces of color information consisting of specific color information and specific luminance information, the specific color information being uniquely defined by the relationship between the plurality of color components and the luminance component, and the specific luminance information being adapted to have a predetermined relationship with the specific color information;
• first converting means for receiving the predetermined number of pieces of color information, converting the specific luminance information of each of the predetermined number of pieces of color information into a digital luminance signal component uniquely defined by the relationship between the specific color information and the specific luminance information, and outputting the digital luminance signal component;
• second converting means for receiving the predetermined number of pieces of color information from said decoding means, converting two color difference signals uniquely defined by the relationship between the specific color information and the specific luminance information of each of the predetermined number of pieces of information into a digital color difference signal component, and outputting the digital color difference signal component;
• color subcarrier component generating means for generating two color subcarrier components, the phase of which are shifted by 90 degrees;
• modulating means for digitally performing balanced modulation for the two subcarrier components having phases shifted by 90 degrees from said color subcarrier component generating means by using the digital color difference signal components from said second converting means, and for outputting digital carrier chrominance signal components;
• adding means for adding the digital carrier chrominance signal components from said modulating means and the digital luminance signal component from said first converting means, and for outputting digital video signal components;
• and
• third converting means for converting the digital video signal components from said adding means into an analog waveform and for outputting an analog video signal.