Patent ID: 7907484
Filing Date: 2011-03-15
Classification: G11B

Abstract:
1. A reproducing apparatus comprising: a reproducing head unit that irradiates an optical disk with a laser beam to obtain a reproduced signal as a reflected light signal; an offset cancellation circuit that cancels an offset element of the reproduced signal; an automatic gain control circuit that adjusts the amplitude of the reproduced signal processed through the offset cancellation circuit; a band switching control unit that detects a fingerprint period during which the reproduced signal is affected by a fingerprint on the surface of the optical disk and, for the fingerprint period, switches a frequency band in which the offset cancellation circuit and the automatic gain control circuit function to a higher frequency band than that associated with a non-fingerprint period; a decoding unit that decodes the reproduced signal processed through the automatic gain control circuit to output binary data; and a data reproduction processing unit that performs data reproduction processing on the binary data output from the decoding unit to obtain reproduced data.