Optical disc device and optical disc determination method

An optical disc device comprising:

• an optical pickup configured to read a signal recorded in an optical disc;
• an envelope signal generation unit configured to generate an envelope signal from the signal read by the optical pickup;
• an off-track level storage unit that stores an off-track level;
• an off-track signal generation unit configured to generate an off-track signal by binarizing the envelope signal using the off-track level stored by the off-track level storage unit, the envelope signal being generated by the envelope signal generation unit;
• and
• a determination unit configured to output a disc determination signal based on the off-track signal generated by the off-track signal generation unit, the disc determination signal indicating whether the optical disc is a standard-density optical disc or a high-density optical disc in which a line density is higher than the standard density,
• wherein the off-track level storage unit stores a determination off-track level and a reproduction off-track level, the reproduction off-track level being different from the determination off-track level, and
• wherein the off-track signal generation unit is configured to generate the off-track signal by reading the determination off-track level when determining whether the optical disc is the standard-density optical disc or the high-density optical disc, and to generate the off-track signal by reading the reproduction off-track level at a time when the optical disc is played.