| 摘要 |
PURPOSE:To reduce envelope distortion remarkably, by providing an automatic level control means in which the gain is made variable with time so as to reduce level of chroma signal is to a given value by the timing in synchronizing with the horizontal scanning in an image sensing means. CONSTITUTION:From a video output Ev corresponding to an objective 12 obtained at an image sensing means 16, a luminance signal Ey and a chroma signal Ec1 are respectively separated via an LPF18 and BPF20 to input the chroma signal to an automatic level control means 34. Further, at the level control means 34, in the timing in synchronizing with the horizontal scanning in an image sensing means 16, the gain of an AGC circuit 22 is changed with time so as to reduce the level of a chroma signal Ec2 to a given value. Thus, even if an envelope distortion of a color carrier which cannot be corrected with a parabola signal VP superimposed on a focus voltage VF is present, the unsharp leading of the envelope is completely compensated to obtain the color carrier with a flat envelope. |
