Clock signal generation device

A method for generating a clock signal, the method comprising the steps of:

• detecting a wobble phase error that is a difference in phase between a wobble signal, which is obtained from a wobbled shape of a track on an optical disk medium, and the clock signal;
• detecting a data phase error that is a difference in phase between a data signal, which is obtained from data that has been written on the optical disk medium, and the clock signal;
• generating a frequency control signal to control the frequency of the clock signal based on the wobble phase error and the data phase error;
• and
• generating the clock signal with its frequency controlled in accordance with the frequency control signal.

A program for getting clock signal generation processing performed by a computer,

• the clock signal generation processing including the steps of:
• detecting a wobble phase error that is a difference in phase between a wobble signal, which is obtained from a wobbled shape of a track on an optical disk medium, and a clock signal;
• detecting a data phase error that is a difference in phase between a data signal, which is obtained from data that has been written on the optical disk medium, and the clock signal;
• generating a frequency control signal to control the frequency of the clock signal based on the wobble phase error and the data phase error;
• and
• generating the clock signal with its frequency controlled in accordance with the frequency control signal.