Yongshanggan white balance control circuit

摘要

In a color processing circuit for a video camera, there is provided a white balance control circuit for supplying a plurality of white balance control voltages to the color processing circuit, the white balance control circuit comprising a control voltage dividing section for dividing first and second white balance voltages from a white balance control section to generate first through fourth white balance control voltages to the color processing circuit. The control voltage dividing section comprises a first inverting amplifier, a second inverting amplifier operable to vary a color temperature estimating range and an intermediate value of the color temperature estimating range, for outputting the second white balance control voltage, a first voltage divider for outputting the third white balance control voltage, a third inverting amplifier operable to vary the color temperature estimating range and the intermediate value of the color temperature estimating range, for outputting the first white balance control voltage, and a second voltage divider outputting the fourth white balance control voltage, whereby the control voltage dividing section is capable of adjusting a color temperature estimating range.