| 摘要 |
A color encoding format is disclosed wherein a chrominance signal in the form of a modulated subcarrier is buried in the midband of a wider band luminance signal. Comb filtering of the luminance signal midband prepares "troughs" in the luminance signal frequency spectrum. The chrominance signal is complementarily comb filtered to confine it to components falling in the vacated troughs of the luminance signal frequency spectrum. An illustrative use of this encoding format is in video disc recording. In subsequent processing of the encoded signals, as, for example, in playback of the video disc, the buried subcarrier chrominance signal may be separated from the midband luminance components by comb filtering, with substantial assurance of freedom from all crosstalk between the shared band components (including freedom from crosstalk by "diagonal" components). Systems (e.g., for recorder use) are shown for direct encoding into the buried subcarrier format, and for transcoding from NTSC format into buried subcarrier format. Systems (e.g., for player use) are also shown for transcoding from buried subcarrier format to NTSC format. |
