Patent ID: 7539096

Claim:
A disc playback apparatus for reproducing information by demodulating and decoding a radio-frequency signal obtained by receiving reflected light of a beam applied to a recording surface of a removable disc when the removable disc is loaded in the disc playback apparatus, the apparatus comprising: disc format determining means for determining the format of the loaded disc; a high-frequency compensation unit adapted to compensate for a high-frequency component of the radio-frequency signal; a low-frequency compensation unit adapted to compensate for a low-frequency component of the radio-frequency signal; a control unit adapted to determine which of the high-frequency compensation unit or the low-frequency compensation unit is to be used to compensate for a frequency characteristic of the radio-frequency signal based on the determined disc format; and signal quality determining means for determining whether or not the quality of the radio-frequency signal is degraded, wherein the control unit compensates for the frequency characteristic of the radio-frequency signal using the high-frequency compensation unit or the low-frequency compensation unit in response to a degradation in the quality of the radio-frequency signal that is determined by the signal quality determining means.