New Systems for Video Processing ICs

In improving the playback picture quality of a VCR, working particularly on improving the reduction of the crosstalk of the chroma signal from the neighboring tracks, and the signal to noise ratio, we concentrated on a modified feedback combfilter, in making up the complex combfilter system. Also, we were able to construct a nearly ideal VCO (Voltage Controlled Oscillator) System used in a color-APC (Automatic Phase Control). Its oscillation frequency is quite stable and it has a wide controllable frequency range. In these two systems we used a comparatively large value capacitor that makes it possible to achieve their special characteristics. Making use of the small elements including the large value capacitance found in the fine IC-process, we were able to fit these systems onto several ICs.