| 摘要 |
A color video recorder/reproducer records wide bandwidth luminance information alternately with narrow bandwidth luminance information plus chrominance information for the transmitted lines of a television picture frame. Before recording, the chrominance information is frequency converted to occupy a frequency band substantially adjacent to the frequency band occupied by the narrow bandwidth luminance information. Upon playback, the frequency converted chrominance information is separated from the narrow bandwidth luminance information and converted to its originally occupied frequency band. A video signal is then reconstructed by combining the signal recorded for a given line with a complementary portion of the signal recorded for the preceding line. Upon display of a picture thus produced, an artifact pattern is observed. The present invention recognizes the source of this artifact pattern to be the imperfect separation of the narrow bandwidth luminance information from the chrominance information. Rather than employ expensive and complicated filtering devices to better separate the two signals, the present invention permits the small portion of chrominance information to stay in the luminance channel but compensates therefor by so frequency converting the chrominance information before recording that the artifacts thus produced in one line of the picture frame are 180 DEG out of phase with the artifacts in an adjacent line and thus are effectively cancelled out by the integrating characteristics of the eye.
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