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Optical card recording/reproducing apparatus with presetting of card sector position data for detecting sector positions
Optical card recording/reproducing apparatus with presetting of card sector position data for detecting sector positions
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机译：具有用于检测扇区位置的卡扇区位置数据的预置的光卡记录/再现设备
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摘要
An optical card recording/reproducing apparatus scans a track of an optical card which includes a data portion at a center and ID portions at both ends. Each of the ID portions includes first and second address areas (identical address), a first sync area preceding the first address area, a second sync area between the first and second address areas, a third sync area succeeding the second address, a preamble preceding the first sync area, and a postamble (the preamble and the postamble are identical signals) succeeding the third sync signal. This apparatus comprises a RAM for storing data indicating the start and end points of each ID portion and of each sector with reference to a predetermined position of a track (e.g., the left end of the left ID portion), a counter for counting the relative moving distance of the optical card, and detection circuit for detecting the position of a sector by comparing the output from the counter with the data of the RAM. If a sync area is detected after detection of the preamble, the first address is demodulated. If a sync signal is detected after the demodulated address is error-corrected, data corresponding to the position of the boundary between the third sync signal and the postamble is preset to the counter.
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