| 摘要 |
The adaptive comb filtering system presented herein is used to separate the luminance and chrominance components of a composite video signal. This video signal is comprised of a plurality of successive horizontal scan lines. The video signal is separated into a middle (M) scan line component and vertically adjacent top (T) and bottom (B) scan line components. These video signal components are employed to provide as a chrominance output signal either a combed chroma signal derived from the top, middle and bottom components, or an uncombed chroma signal derived from only one of the components. The selection of the combed chroma signal or the uncombed chroma signal is determined by a transition detector which compares a vertical transition with a horizontal transition and selects one of the signals as the chrominance output signal in dependence upon the comparison. |
