| 摘要 |
A method and apparatus for modifying a color television signal permits three types of information to be coded onto a single subcarrier. Preferably two chrominance signals and a low frequency luminance signal are modulated onto the subcarrier in different sets of two such signals per scan line, such different sets being alternated on a line-by-line basis. The signals of such a set of two while occurring simultaneously are displaced in phase on the subcarrier and the subcarrier frequency is preferably selected to be an odd multiple of one-quarter of the line frequency. By so selecting the subcarrier frequency, a combination of the subcarrier signal with a luminance signal may be effected in a manner allowing for subsequent signal separation by comb filtering.
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