| 摘要 |
<p>PURPOSE:To attain natural hue adjustment by obtaining a luminance signal and a color difference signal subject to contrast adjustment by a 1st voltage variable means, obtaining the color difference signal subject to color saturation adjustment by a 2nd voltage variable means and obtaining the color difference signal subject to hue adjustment by a 3rd voltage variable means. CONSTITUTION:A DC voltage at terminals VY, VR, VB varies at almost a same ratio by adjusting a variable resistor R1 of a 1st voltage variable circuit 22 to attain the adjustment of the contrast. Moreover, a DC voltage at the terminals VR, VB varies at almost a same ratio by adjusting a variable resistor R4 of a 2nd voltage variable circuit 23 to attain the adjustment of the color saturation. Moreover, a DC voltage at the terminals VR, VB varies differentially by adjusting an output voltage with a variable resistor R9 of a voltage division circuit 25, the gain of amplifiers 6, 7 varies differentially in the hue adjustment and the gain change of the amplifiers 6, 7 is changed in a saturating direction when the voltage at the terminals VR, VB, with respect to a time when the voltages at the terminals VR, VB are equal to each other.</p> |
