| 摘要 |
When copying cinematographic film onto color video tape there is ensured a given, desired mutual phase position between the picture frames of the film and a periodic signal component in the composite video signal recorded on the video tape, said periodic signal component extending over an integral number of picture frames. This is effected by splicing onto one end of the film (F) a film leader (FS) which is provided with a periodically repeated sequence of at least two mutually sequential picture frames (FS1, FS2) having mutually different, clearly discernible picture contents, for example one being dark and the other being light. The film (F) is fed into the telecine equipment (1) used for the copying process, with the film leader (FS) first. When feeding the film leader (FS) through the telecine equipment (1) the current picture content, of the electronic picture signal from the telecine equipment (1) at any given time is compared by means of an electronic logic comparison circuit (5) with the current phase position of the periodic signal component of the composite video signal, the comparison circuit establishing whether or not the picture content of the picture signal lies in the predetermined, desired phase position relative to the periodic signal component. If such is not the case, feeding of the film through the telecine equipment (1) is stopped and then re-started, this procedure being repeated until the predetermined, desired phase position is obtained and copying of the actual film onto the video tape can take place.
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