| 摘要 |
PURPOSE:To compensate outlines of luminance changing portions and also of color changing portions, by flowing an electric current corresponding to the differential waveform of a color difference signal which corresponds to the luminous color of the projecting cathode-ray tube, or a composite signal of said color difference signal and a luminance signal, to the auxiliary deflecting coil of each projection cathode-ray tube. CONSTITUTION:Each color difference signal of the output from a color demodulating circuit 17 is differentiated at differentiating circuits 18, 19, and 20, and luminance signals Y from an image amplifying circuit 21 is differentiated at another differentiating circuit 22, and then, they are combined at an adequate ratio at combining circuits 23, 24, and 25 and drive auxiliary deflecting coils 14, 15, and 16 of each projecting cathode-ray tube, respectively. When the color difference signal and the luminance signal are equally combined as a combining ratio at the combining circuits 23, 24, and 25, the same result as differentiating the original color signal is obtained. When such a circuit configuration is applied, corrections of preshoot and overshoot can be applied to images at the edge part of color change at every original color in accordance with the change in the color component, and, therefore, the outline part can be improved sharply. |
