| 摘要 |
PURPOSE:To obtain a follow-up characteristic sufficient for a color jitter component by removing the jitter component from a video signal through an APC loop and then separating only a color signal component by a comb-shaped filter. CONSTITUTION:The APC loop relating to the removal of the jitter component is composed of the 1st frequency converting circuit 3, a band-pass filter 4, an ACC circuit 6, a phase detecting circuit 7, and a VCXO circuit 8, and the output of the band-pass filter 4 is impressed to the 1st comb-shape filter 5. Consequently, when the color signal component in the output signal of an FM detector 2 varies with the jitter component to vary the color signal component in the output signal of a frequency converting circuit 3, the variation is absorbed completely by the APC loop. Then, an adding circuit 11 adds the color signal output of the filter 5 to a luminance signal from the 2nd comb-shaped filter 10 to output a video signal. |
