Patent ID: 6822694
Filing Date: 2004-11-23
Classification: H04N

Abstract:
A signal processing apparatus for mixing a first digital component signal and a second digital component signal, each including both luminance and color components in which a sampling frequency ratio of said color component of said second digital component signal is lower than that of said first digital component signal, comprising:a video signal processing circuit for partitioning said luminance and color components of said second digital signal before performing band limitation and delay adjusting to the components of said second digital signal; a digital filter for performing said band limitation to the color component of said second digital component signal wherein a transfer function to be applied by said digital filter is selected in accordance with the sampling frequency ratio of said second digital component signal; a delay adjusting circuit for performing said delay adjusting to only the luminance component of said second digital component signal; mixing means for mixing said first digital component signal and said second digital component signal, said second digital component signal having said color component band limited and the timing of said luminance component delay adjusted before said mixing and outputting a mixed signal; D/A converting means for D/A converting said mixed signal output from said mixing means from a digital to an analog signal; and a filter for performing filter processes to the analog signal converted by said D/A converting means and resulting from said mixing of said first digital component signal and said second digital component signal modified by said band limitation and said delay adjusting.