Clock signal generation apparatus, apparatus for generating a clock signal using an information recording medium, integrated circuit, clock signal generation method, and method for generating a clock signal using an information recording medium

An apparatus for generating a clock signal using an information recording medium, wherein the information recording medium comprises at least one track having a wobbling shape, the apparatus comprising:

• a wobble signal generation section for generating a wobble signal based on the wobbling shape in accordance with a reproduction signal obtained by irradiating the information recording medium with laser light;
• and
• a clock signal generation section for generating the clock signal synchronized with the wobble signal,
• wherein the clock signal generation section comprises:
• an oscillation section for generating the clock signal;
• a counter section for generating a predetermined count value;
• a phase comparison section for integrating an amplitude value of the wobble signal over a predetermined interval specified based on the predetermined count value to obtain a first integrated value, and obtaining a phase difference value indicating a phase difference between the wobble signal and the clock signal based on the first integrated value;
• and
• a control signal generation section for generating a control signal based on the phase difference value, the control signal being used for controlling a frequency of the clock signal,
• wherein the oscillation section adjusts the frequency of the clock signal based on the control signal.

An integrated circuit for generating a clock signal synchronized with a wobble signal, comprising:

• an oscillation section for generating the clock signal;
• a counter section for generating a predetermined count value;
• a phase comparison section for integrating an amplitude value of the wobble signal over a predetermined interval specified based on the predetermined count value to obtain a first integrated value, and obtaining a phase difference value indicating a phase difference between the wobble signal and the clock signal based on the first integrated value;
• and
• a control signal generation section for generating a control signal based on the phase difference value, the control signal being used for controlling a frequency of the clock signal,
• wherein the oscillation section adjusts the frequency of the clock signal based on the control signal.

A clock signal generation method for generating a clock signal synchronized with a wobble signal, comprising the steps of:

• (a) generating the clock signal;
• (b) generating a predetermined count value;
• (c) integrating an amplitude value of the wobble signal over a predetermined interval specified based on the predetermined count value to obtain a first integrated value, and obtaining a phase difference value indicating a phase difference between the wobble signal and the clock signal based on the first integrated value;
• and
• (d) generating a control signal based on the phase difference value, the control signal being used for controlling a frequency of the clock signal,
• wherein step (a) comprises adjusting the frequency of the clock signal based on the control signal.

A method for generating a clock signal using an information recording medium, wherein the information recording medium comprises at least one track having a wobbling shape, the method comprising the steps of:

• generating a wobble signal based on the wobbling shape in accordance with a reproduction signal obtained by irradiating the information recording medium with laser light;
• and
• generating the clock signal synchronized with the wobble signal,
• wherein the step of generating the clock signal comprises the steps of:
• (a) generating the clock signal;
• (b) generating a predetermined count value;
• (c) integrating an amplitude value of the wobble signal over a predetermined interval specified based on the predetermined count value to obtain a first integrated value, and obtaining a phase difference value indicating a phase difference between the wobble signal and the clock signal based on the first integrated value;
• and
• (d) generating a control signal based on the phase difference value, the control signal being used for controlling a frequency of the clock signal,
• wherein the step of generating the clock signal comprises adjusting the frequency of the clock signal based on the control signal.