| 摘要 |
PROBLEM TO BE SOLVED: To make discriminable an unexposed frame from an exposed frame by precisely discriminating whether data are magnetically recorded or not. SOLUTION: A data track is read by a magnetic head in the midst of feeding a photographic film and a reproducing signal obtained according as the data track is read is inputted to an A/D converter. The A/D converter almost continuously samples a signal level and outputs digitally converted sampling data. A CPU extracts the effective sampling data becoming equal to or over a threshold value Th from the sampling data. Then, a part where the number of effective sampling data being over a prescribed number continuously exists is discriminated as an effective block. When the number of effective blocks being over the prescribed number is detected from the data track of one frame, it is discriminated that the data is recorded on the data track and the photographic frame of this data track is discriminated as the exposed frame. When the number of effective blocks is equal to or under the prescribed number, it is discriminated that the data are not recorded on the data track and the photographic frame of this data track is discriminated as the unexposed frame.
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