Chrominance signal processing apparatus in video signal processing system

Abstract

A chrominance signal processing apparatus in a video signal processing system which has a simple configuration capable of achieving chrominance signal control and RGB transform functions using a single circuit. The chrominance signal processing apparatus includes a key input unit provided with a plurality of control keys for chrominance signal controls, the key input unit serving to generate key data in response to a manipulation of desired control keys by the user, a chrominance signal control coefficient computing unit adapted to calculate chrominance signal control coefficients in response to a user's request for chrominance signal controls received via the key input unit, respectively, the calculation of the chrominance signal control coefficients being carried out in accordance with a matrix computation for variations in chrominance signal coefficients respectively associated with the chrominance signal control coefficients to be calculated, and a chrominance signal control and RGB transform unit adapted to conduct the requested chrominance signal controls for chrominance signals separated from a video signal, along with a luminance signal, by a comb filter of the video signal processing system, based on the chrominance signal control coefficients received from the chrominance signal control coefficient computing unit, and adding the controlled chrominance signals to the luminance signal, respectively, thereby outputting R, G, and B video signals.