A method and circuit arrangement for eliminating farbverfaelschungen considerably reduced, and in the case of pointed in a schematic

摘要

The colour purity circuit, for colour television cameras, prevents wrong colours arising under high illumination - ie prevents the strong green difference signal due to the red and green colour components having no effect. When the luminance signal (W) exceeds a given level, the red and blue colour difference signals are blanked out. The luminance signal is applied to a threshold trigger (1) that controls two blanking switches (2, 3), one in the R W channel and the other in the B W channel. When a given luminance signal.