| 摘要 |
PURPOSE:To make it possible to prolong memory time, to reduce electric power consumption and to adjust white balance easily and accurately, by storing a digital circuit with the control signal of a gain control circuit for control over the gain of a color signal. CONSTITUTION:Red and blue signal systems are provided with gain control circuits 13a and 13b respectively and gains are controlled with the outputs of D/A converters 14a and 14b. The outputs of gain control circuits 13a and 13b are compared to the level of a green signal by deciding circuits 15a and 15b to determine the directions of increases or decreases of reversible counting circuits 16a and 16b composed of digital circuits, thereby generating control signals for gain control circuits 13a and 13b. |
