Optical disc reproduction apparatus

An optical disc reproduction apparatus for an optical disc including a track including a plurality of sectors, wherein:

• the track is wobbled at a prescribed cycle,
• the plurality of sectors each include an address section and a data section, and
• the optical disc reproduction apparatus further includes:
• a wobble detection section for detecting wobbles of the track,
• a PLL section for outputting a clock signal synchronized to the cycle of the detected wobbles,
• an address section detection section for detecting the address section based on the clock signal, and
• a PLL holding section for holding the PLL section for a prescribed term including a term during which the address section is being detected.

An optical disc reproduction apparatus for an optical disc including a track including a plurality of sectors, wherein:

• the track is wobbled at a prescribed cycle,
• the plurality of sectors each include an address section and a data section, and
• the optical disc reproduction apparatus further includes:
• a sector detection section for detecting a sector,
• a first PLL section for outputting a first clock signal synchronized to a cycle at which the sector is detected,
• a wobble detection section for detecting wobbles of the track,
• a second PLL section for outputting a second clock signal synchronized to a cycle of the detected wobbles, and
• an abnormality detection section for detecting an abnormality of a frequency of the first clock signal based on a relationship between the first clock signal which is output by the first PLL section and the second clock signal which is output by the second PLL section.