Patent ID: 7286459

Claim:
An optical disc reproduction apparatus determining whether an optical disc to be reproduced is a recordable optical disc having wobble formed or a read-only optical disc without wobble being formed, comprising: a bandpass filter receiving a tracking error signal; a measurement circuit measuring an average frequency and a minimum frequency of a signal output from said bandpass filter, wherein said measurement circuit measures an average frequency and a minimum frequency within a prescribed time period, of the output from said bandpass filter; and a first circuit determining whether the optical disc to be reproduced is a recordable optical disc or a read-only optical disc, based on measured said average frequency and said minimum frequency, wherein said first circuit includes: an operation circuit operating measured said average frequency and said minimum frequency, wherein said operation circuit subtracts said measured minimum frequency from said measured average frequency so as to obtain a subtraction value, and a determination circuit determining whether the optical disc to be reproduced is a recordable optical disc or a read-only optical disc based on a result of the operation, wherein said determination circuit determines the optical disc to be reproduced as a read-only optical disc when said subtraction value is not smaller than a prescribed value, and determines the optical disc to be reproduced as a recordable optical disc when said subtraction value is smaller than the prescribed value.