Color encoder with chrominance subcarrier generator responsive to a plurality of clock rates or frequencies

Abstract

A color encoder is incorporated in an apparatus for reproducing a signal recorded on a disk for a video-CD, CD-G, or similar system. The color encoder serves as an interface between such an apparatus and a television receiver. The color encoder has a color-difference signal forming circuit for forming a color-difference signal from R, G, and B signals reproduced from a disk, a modulation circuit for modulating a chrominance subcarrier with the color-difference signal, and chrominance subcarrier generating device for generating the chrominance subcarrier. Moreover, to generate a chrominance signal having the same frequency for any of a plurality of clocks having different predetermined frequencies, the chrominance subcarrier generating device has a plurality of ROMs, each containing in its data area a data table corresponding to a different frequency, and a ROM switching circuit for selecting a ROM to be accessed from among the plurality of ROMs in accordance with a switching signal.