Video processor having reduced capacity luminance delay circuit

For use in an image display system responsive to a composite video signal having chrominance and luminance information, a video processing method comprising the steps of:

• receiving said composite video signal;
• separating said luminance information from said chrominance information to provide a luminance signal;
• processing said luminance signal to produce a lower frequency portion digital signal clocked at a low frequency and a higher frequency portion digital signal clocked at a high clock frequency;
• delaying said lower frequency portion digital signal to produce a delayed lower frequency portion digital signal;
• converting said delayed lower frequency portion digital signal to a high frequency clocked signal;
• and
• combining said higher frequency and lower frequency portion digital signals.

For use in an image display system responsive to a composite video signal and having a high frequency clock signal source and a low frequency clock signal source, video processing means comprising:

• means for receiving a composite video signal having luminance information and chrominance information;
• means for frequency dividing said composite video signal into a chrominance band signal and a luminance band signal;
• first processor means for processing said chrominance band signal to separate luminance and chrominance information within said chrominance band signal;
• chrominance processor means for demodulating said chrominance information to produce color signals;
• second processor means for processing said luminance band signal having means for separating said luminance band signal into a lower frequency portion and a higher frequency portion, delay means for establishing a predetermined luminance delay in said low frequency portion of said luminance band signal with respect to said higher frequency portion, decimator means for converting said lower frequency portion to a lower frequency clocked signal before said delay means and interpolator means for converting said delayed lower frequency portion to a high frequency clocked signal;
• means for combining said luminance information within said chrominance band signal and said luminance band signal to form a full-spectrum luminance signal;
• and
• matrix means for combining said full-spectrum luminance signal with said color signals.

For use in an image display system responsive to a composite video signal having luminance information and chrominance information signals and having a source of high frequency clock signals and low frequency clock signals, a video processing method comprising the steps of:

• receiving said composite video signal;
• frequency dividing said composite video signal into a chrominance band signal and a luminance band signal;
• processing said chrominance band signal to produce high frequency clocked luminance information and chrominance information within said chrominance band;
• processing said luminance band signal to produce a low frequency portion digital signal having a clock rate equal to said source of low frequency clock signals and a high frequency portion digital signal having a clock rate equal to said source of high frequency clock signals;
• delaying said low frequency portion digital signal of said luminance band signal to produce a delayed low frequency portion digital signal;
• processing said delayed low frequency portion digital signal to provide a delayed low frequency portion digital signal having said high frequency clock rate;
• combining said luminance information within said chrominance band signal, said delayed low frequency portion digital signal having a clock rate equal to said source of high frequency clock signal and said high frequency portion digital signal to form a full spectrum luminance signal.