Optical disc apparatus controlling irradiation position based on cross-correlation value between reproduction signal and decoded signal

An optical disc apparatus reproducing information recorded on a track of an optical disc, the optical disc apparatus comprising:

• an optical head that irradiates a light beam onto the track, detects a reflected light reflected by the track, and generates a reproduction signal based on the reflected light;
• a decoder circuit that decodes the reproduction signal, and generates a decoded signal including information recorded on the track;
• a phase error detector circuit that calculates a phase error value between the reproduction signal and the decoded signal;
• and
• a servo circuit that detects a deviation amount of an irradiation position of the light beam onto the track, from the reproduction signal, and controls the irradiation position of the optical head based on the phase error value and the deviation amount.

An optical disc apparatus reproducing information recorded on a track of an optical disc, the optical disc apparatus comprising:

• an optical head that irradiates a light beam onto the track, detects a reflected light reflected by the track, and generates a reproduction signal based on the reflected light;
• a decoder circuit that decodes the reproduction signal, and generates a decoded signal including information recorded on the track;
• a correlation detector circuit that calculates a cross-correlation value between the reproduction signal and the decoded signal;
• a phase error detector circuit calculating a phase error value between the reproduction signal and the decoded signal;
• and
• a servo circuit that detects a deviation amount of an irradiation position of the light beam onto the track, from the reproduction signal, and controls the irradiation position of the optical head based on the cross-correlation value, the phase error value, and the deviation amount.