| 摘要 |
A disk discrimination apparatus for use in an optical disk reproducing apparatus detects a tracking error signal, discriminates between disks, and prevents reproduction of a disk which does not correspond to the reproducing apparatus. In the disk discrimination apparatus, when a second type disk, having a track pitch which is smaller than that of a first type disk, is played by the optical disk reproducing apparatus, a discriminator detects that the disk is not a first type disk based on an output signal of a tracking error signal generating circuit. The discriminator performs a discrimination operation by comparing the signal level of a tracking error signal with a predetermined reference value. In another embodiment, the discriminator includes a counter for counting the number of zero-crossings of the tracking error signal, and performs the disk discrimination using a count value produced by the counter.
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