| 摘要 |
In a circuit for combined color decoding and color decimation of a video signal, particularly for picture-into-picture fade in, the color carrier is detected from the video signal (FB, FB') in order to recover the chrominance signal components (U, V). The video signal (FB') is multiplicatively (5, 6) linked to the orthogonal color carrier components and subsequently filtered through low-pass filters (8, 9). For the luminance signal component (Y), the video signal (FB') is filtered through an additional low pass filter (7). To obtain the decimated luminance and chrominance signal components (Y, U, V), a sub-sampling is carried out after the low-pass filters (7, 8, 9). When the low-pass filters (7, 8, 9) are appropriately designed for the decimation factor, a single low-pass filter (8, 9) suffices in the chrominance signal paths and a notch filter is no longer required in the luminance signal path. |
