| 摘要 |
PURPOSE:To make it possible to color pattern display on a screen easily and stably, by providing a color circuit. CONSTITUTION:Central processing unit CPU, read-only memory ROM, random access memory RAM 20, and a decoder are comined by an address bus line and a data bus line; a regenerative pattern signal is obtained by shift register 24 from RAM20 and then applied to color circuit 25. On the basis of the oscillation frequency signal of oscillator 12, decoder 41 divides the pattern signal into a luminance signal component and various color signal components, which are applied to gate circuits 42 to 44 which gate those components selectively. Further, outputs of gate circuits 42 to 44 are mixed by mixer 27 to obtain a color video signal. |
