Patent ID: 7433281

Claim:
An apparatus for reproducing an address on a disc-shaped recording medium on the basis of wobbles of a groove formed on the disc-shaped recording medium, the apparatus comprising: radiating means for radiating laser light to the disc-shaped recording medium; return light detecting means for detecting return light from the disc-shaped recording medium to generate a return light signal corresponding to the return light thus detected; wobbling signal generating means for generating a wobbling signal corresponding to the wobbles of the groove on the basis of the return light signal generated by the return light detecting means; demodulating means for demodulating the wobbling signal generated by the wobbling signal generating means to recover address information composed of a sync signal including a plurality of sync unit patterns, address data and an error correction code for the address data; means for detecting at least one of the plurality of sync unit patterns included in the sync signal in the address information recovered by the address information recovering means, each sync signal including two first signals of a first phase, and a second signal of a second phase opposite the first phase, the second signal formed between the two first signals to separate the two first signals; sync unit pattern detecting means for acquiring the address data and the error correction code for the address data from the address information on the basis of the interval between the two first signals separated by the second signal of the sync unit pattern detected by the sync unit pattern detecting means; and reproducing means for reproducing the address on the basis of the address data and the error correction code for the address data, extracted by the acquiring means.