Abstract: A state memory circuit responsive to a selection signal indicative of either the first television system or the second television system selected according to an external setting operation and adapted to be set to a logical "1" or "0" state when the selection signal indicates that the first television system is selected, the state of the state memory circuit being alternated between "1" and "0" for every signal according to the burst flag pulse when the selection signal selects the second television system, and a timing circuit for outputting the state of the state memory circuit at a timing before a leading edge of the burst flag pulse or after a trailing edge of the burst flag pulse and responds to an even number of burst signals in one frame and generates a color video signal suitable to the first or the second television system according to the selection signal.

Abstract: A digital encoder for use in both NTSC and PAL systems includes a demultiplexer for separating a time-division color difference signal R-Y/B-Y into color difference signals R-Y and B-Y. The separated color difference signals R-Y and B-Y are converted by a sub-carrier frequency converter into a sub-carrier frequency, and a digital modulator determines levels and phases of the converted color difference signals. A burst generating circuit generates a burst signal after determining a level and phase of the burst signal, and a chroma encoder produces a chroma signal by mixing an output of the digital modulator with the burst signal.