| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for discriminating the type of an optical disk regardless of the output signal value that is obtained from a pickup according to the type of the optical disk and also to provide an optical disk reproducer which can automatically discriminate the type of a disk. SOLUTION: An optical disk 1 is driven, and an optical pickup 5 reads the information recorded on the disk 1 and outputs a reproduction signal. In the output mode of the reproduction signal, one of reproduction clock frequency (f) and reproduction velocity V of the reproduction signal is controlled at the prescribed value. Then the type of the disk 1 under reproduction is discriminated according to the value of the other of the said frequency (f) and velocity V.
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