Importance

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Abstract

The present invention relates to system for reading an optical recording medium having a data region formed by arranging, in parallel, a plurality of data tracks each of which is constituted by a plurality of bits along a reference line positioned perpendicular to the data tracks enabling the recording capacity of the optical recording medium to be enlarged. A bit included in the data track and positioned adjacently to the reference line is arranged to be a clock bit. A reading portion is provided with a counter for generating a clock window on the basis of a read signal of the data track; an AND circuit for calculating the logical product of the clock window and the read signal of the clock bit in the present data region and generating a true clock pulse or a dummy clock pulse; a counter for converting the dummy clock pulse into the timing of the true clock pulse in the case of the dummy clock pulse; a counter for generating a data window on the basis of the true clock pulse; and an AND circuit for calculating the logical product of the data window and the read signal so as to make the logical product to be data. Even if the number of the reference line in the optical recording medium is reduced to one, data can be correctly read so that the data recording capacity can be significantly enlarged.

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First Claim