| 摘要 |
A time code arithmetic apparatus having a very simple configuration is disclosed, in which the mode of two time codes is not required to be the drop mode, and the arithmetic operation of the time code flexibly meeting the requirement of all television transmission systems can be performed. Two time codes input through selector circuits A and B are added/subtracted in arithmetic means as a time code of non-drop mode simply based on the add/subtract information and the result of the arithmetic operation Oab is output. For the arithmetic result Oab and the pre-calculation time code, the total number of frames skipped (dropped) during the time lapse frame by frame from 00:00:00.00 o'clock is calculated, and in the case where the total numbers of two types of drop frames are not equal to each other, the arithmetic result Oab and the difference Nb between the two types of drop frames are returned to the selector circuits A and B, and the arithmetic operation is performed again in the arithmetic means.
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