Patent ID: 7366067

Claim:
A recording clock signal generating apparatus located in an information recording device for recording information in a recording medium in which a wobbled information recording track and pre-pit formed thereon, said apparatus comprising: a wobble signal detecting section for detecting a wobble signal; a pre-pit signal detecting section for detecting a pre-pit signal; a phase comparing section for comparing a phase of said wobble signal to that of said pre-pit signal and outputting the phase difference; a determining section for determining whether the pre-pit signal is generated by erroneous detection of the pre-pit or not; a phase-shifting section for shifting a phase of said wobbled signal based on said phase difference only when the determining section determines that the pre-pit signal is not generated by the erroneous detection; and a clock signal generating section for generating a recording clock signal based on said phase-shifted wobble signal, wherein the determining section compares the phase difference with a predetermined threshold, does not determine that the pre-pit signal is generated by the erroneous detection when the phase difference is within the threshold and determines that the pre-pit signal is generated by the erroneous detection when the phase difference is out of the range of the threshold.