Method and apparatus for converting picture signal, and recording and reproducing apparatus

摘要

A picture signal includes a luminance signal and a color signal. A first predetermined number of sample points of the luminance signal are located on every actual scanning line. A second predetermined number of sample points of the color signal are located on every actual scanning line. The second predetermined number is equal to the first predetermined number multiplied by "1/n", where "n" denotes a predetermined integer equal to or greater than 2. Virtual scanning lines are set which correspond to respective pairs each having two successive actual scanning lines. Sample points of the color signal are moved from each pair of two successive actual scanning lines to a corresponding virtual scanning line while being rearranged thereon so that the picture signal is converted. The total number of sample points of the color signal per virtual scanning line is equal to the first predetermined number multiplied by "2/n". A portion of the color signal whose sample points are located on a virtual scanning line corresponds to a portion of the luminance signal which relates to the corresponding pair of two successive actual scanning lines.