Tracking error signal generater, track error signal generation mathod, controller and control method

A tracking error signal generating apparatus for a disc-shaped information recording medium, comprising:

• a reproduction portion of outputting a reproduction signal including information of a first clock pit, a second clock pit, a first wobble pit and a second wobble pit formed on said disc-shaped information recording medium;
• a clock pit signal detection portion of detecting a first clock pit signal, which is the reproduction signal of said first clock pit, and a second clock pit signal which is the reproduction signal of said second clock pit from said reproduction signal;
• a clock pit signal interval measurement portion of measuring the time interval between said first clock pit signal and said second clock pit signal and of outputting a second clock pit signal interval value which is the measured value;
• a computation portion of receiving said second clock pit signal interval value, and of calculating and outputting a first wobble pit signal interval value and a second wobble pit signal interval value which are values nearly proportional to said second clock pit signal interval value;
• a first wobble pit signal detection portion of detecting said reproduction signal at first timing derived on the basis of at least said first clock pit signal or said second clock pit signal and said first wobble pit signal interval value and of outputting a first wobble pit signal which is the detected reproduction signal;
• a second wobble pit signal detection portion of detecting said reproduction signal at second timing derived on the basis of at least said first clock pit signal or said second clock pit signal and said second wobble pit signal interval value and of outputting a second wobble pit signal which is the detected reproduction signal;
• and
• a differential signal generation portion of carrying out a subtraction between said first wobble pit signal and said second wobble pit signal and of generating a differential signal.

A tracking error signal generating apparatus for a disc-shaped information recording medium, comprising:

• a reproduction portion of outputting a reproduction signal including information of a groove portion or an inter-groove portion or both a groove portion and an inter-groove portion and information of a first wobble pit and a second wobble pit, which are formed on said disc-shaped information recording medium;
• an edge signal detection portion of detecting, from said reproduction signal, a first edge signal which is the reproduction signal at the groove trailing edge position or the groove leading edge position of said groove portion or said inter-groove portion or both said groove portion and said inter-groove portion;
• a first edge signal interval measurement portion of measuring the time interval between two adjacent signals of said first edge signals and of outputting a first edge signal interval value which is the measured value;
• a computation portion of receiving said first edge signal interval value, and of calculating and outputting a first wobble pit signal interval value and a second wobble pit signal interval value which are values nearly proportional to said first edge signal interval value;
• a first wobble pit signal detection portion of detecting said reproduction signal at first timing derived on the basis of at least said first edge signal and said first wobble pit signal interval value and of outputting a first wobble pit signal which is the detected reproduction signal;
• a second wobble pit signal detection portion of detecting said reproduction signal at second timing derived on the basis of at least said first edge signal and said second wobble pit signal interval value and of outputting a second wobble pit signal which is the detected reproduction signal;
• and
• a differential signal generation portion of carrying out a subtraction between said first wobble pit signal and said second wobble pit signal and of generating a differential signal.

A tracking error signal generating apparatus for a disc-shaped information recording medium, comprising:

• a reproduction portion of outputting a reproduction signal including information of a groove portion or an inter-groove portion or both a groove portion and an inter-groove portion and information of a first wobble pit and a second wobble pit, which are formed on said disc-shaped information recording medium;
• an edge signal detection portion of detecting, from said reproduction signal, a first edge signal, which is the reproduction signal at the groove trailing edge position of said groove portion or said inter-groove portion or both said groove portion and said inter-groove portion, and a second edge signal which is the reproduction signal at the groove leading edge position of said groove portion or said inter-groove portion or both said groove portion and said inter-groove portion;
• an edge signal interval measurement portion of measuring the time interval between said first edge signal and said second edge signal and of outputting a second edge signal interval value which is the measured value;
• a computation portion of receiving said second edge signal interval value, and of calculating and outputting a first wobble pit signal interval value and a second wobble pit signal interval value which are values nearly proportional to said second edge signal interval value;
• a first wobble pit signal detection portion of detecting said reproduction signal at first timing derived on the basis of at least said first edge signal or said second edge signal and said first wobble pit signal interval value and of outputting a first wobble pit signal which is the detected reproduction signal;
• a second wobble pit signal detection portion of detecting said reproduction signal at second timing derived on the basis of at least said first edge signal or said second edge signal and said second wobble pit signal interval value and of outputting a second wobble pit signal which is the detected reproduction signal;
• and
• a differential signal generation portion of carrying out a subtraction between said first wobble pit signal and said second wobble pit signal and of generating a differential signal.

(After amendment) A disc-shaped information recording medium control apparatus comprising:

• a reproduction portion of outputting a reproduction signal including information of a first clock pit, a second clock pit and one or more pre-pits disposed in a region between said first clock pit and said second clock pit, which are formed on said disc-shaped information recording medium;
• a clock pit signal detection portion of detecting a first clock pit signal, which is the reproduction signal of said first clock pit, and a second clock pit signal which is the reproduction signal of said second clock pit from said pre-pits reproduction signal;
• and
• a clock pit signal interval measurement portion of measuring the time interval between said first clock pit signal and said second clock pit signal and of outputting a second clock pit signal interval value which is the measured value of said time interval between said first clock pit signal and said second clock pit signal, wherein
• said disc-shaped information recording medium is rotated so that said second clock pit signal interval value becomes a constant value.

(After amendment) A disc-shaped information recording medium control apparatus comprising:

• a reproduction portion of outputting the reproduction signal of a groove portion or an inter-groove portion or both a groove portion and an inter-groove portion, formed on a disc-shaped information recording medium and divided by a pre-pit region;
• an edge signal detection portion of detecting, from said reproduction signal, a first edge signal, which is the reproduction signal at the leading edge of said pre-pit region, and a second edge signal which is the reproduction signal at the trailing edge of said pre-pit region;
• and
• an edge signal interval measurement portion of measuring the time interval between said first edge signal and said second edge signal and of outputting a second edge signal interval value which is the measured value of said time interval between said first edge signal and said second edge signal, wherein
• said disc-shaped information recording medium is rotated so that said second edge signal interval value becomes a constant value.

A tracking error signal generating method for a disc-shaped information recording medium, comprising:

• a reproduction step of outputting a reproduction signal including information of a first clock pit, a first wobble pit and a second wobble pit formed on said disc-shaped information recording medium;
• a clock pit signal detection step of detecting a first clock pit signal which is the reproduction signal of said first clock pit from said reproduction signal;
• a first clock pit signal interval measurement step of measuring the time interval between two adjacent signals of said first clock pit signals and of outputting a first clock pit signal interval value which is the measured value;
• a computation step of receiving said first clock pit signal interval value, and of calculating and outputting a first wobble pit signal interval value and a second wobble pit signal interval value which are values nearly proportional to said first clock pit signal interval value;
• a first wobble pit signal detection step of detecting said reproduction signal at first timing derived on the basis of at least said first clock pit signal and said first wobble pit signal interval value and of outputting a first wobble pit signal which is the detected reproduction signal;
• a second wobble pit signal detection step of detecting said reproduction signal at second timing derived on the basis of at least said first clock pit signal and said second wobble pit signal interval value and of outputting a second wobble pit signal which is the detected reproduction signal;
• and
• a differential signal generation step of carrying out a subtraction between said first wobble pit signal and said second wobble pit signal and of generating a differential signal.

A tracking error signal generating method for a disc-shaped information recording medium, comprising:

• a reproduction step of outputting a reproduction signal including information of a first clock pit, a second clock pit, a first wobble pit and a second wobble pit formed on said disc-shaped information recording medium;
• a clock pit signal detection step of detecting a first clock pit signal, which is the reproduction signal of said first clock pit, and a second clock pit signal which is the reproduction signal of said second clock pit from said reproduction signal;
• a clock pit signal interval measurement step of measuring the time interval between said first clock pit signal and said second clock pit signal and of outputting a second clock pit signal interval value which is the measured value;
• a computation step of receiving said second clock pit signal interval value, and of calculating and outputting a first wobble pit signal interval value and a second wobble pit signal interval value which are values nearly proportional to said second clock pit signal interval value;
• a first wobble pit signal detection step of detecting said reproduction signal at first timing derived on the basis of at least said first clock pit signal or said second clock pit signal and said first wobble pit signal interval value and of outputting a first wobble pit signal which is the detected reproduction signal;
• a second wobble pit signal detection step of detecting said reproduction signal at second timing derived on the basis of at least said first clock pit signal or said second clock pit signal and said second wobble pit signal interval value and of outputting a second wobble pit signal which is the detected reproduction signal;
• and
• a differential signal generation step of carrying out a subtraction between said first wobble pit signal and said second wobble pit signal and of generating a differential signal.

A tracking error signal generating method for a disc-shaped information recording medium, comprising:

• a reproduction step of outputting a reproduction signal including information of a groove portion or an inter-groove portion or both a groove portion and an inter-groove portion and information of a first wobble pit and a second wobble pit, which are formed on said disc-shaped information recording medium;
• an edge signal detection step of detecting, from said reproduction signal, a first edge signal which is the reproduction signal at the groove trailing edge position or the groove leading edge position of said groove portion or said inter-groove portion or both said groove portion and said inter-groove portion;
• a first edge signal interval measurement step of measuring the time interval between two adjacent signals of said first edge signals and of outputting a first edge signal interval value which is the measured value;
• a computation step of receiving said first edge signal interval value, and of calculating and outputting a first wobble pit signal interval value and a second wobble pit signal interval value which are values nearly proportional to said first edge signal interval value;
• a first wobble pit signal detection step of detecting said reproduction signal at first timing derived on the basis of at least said first edge signal and said first wobble pit signal interval value and of outputting a first wobble pit signal which is the detected reproduction signal;
• a second wobble pit signal detection step of detecting said reproduction signal at second timing derived on the basis of at least said first edge signal and said second wobble pit signal interval value and of outputting a second wobble pit signal which is the detected reproduction signal;
• and
• a differential signal generation step of carrying out a subtraction between said first wobble pit signal and said second wobble pit signal and of generating a differential signal.

A tracking error signal generating method for a disc-shaped information recording medium, comprising:

• a reproduction step of outputting a reproduction signal including information of a groove portion or an inter-groove portion or both a groove portion and an inter-groove portion and information of a first wobble pit and a second wobble pit, which are formed on said disc-shaped information recording medium;
• an edge signal detection step of detecting, from said reproduction signal, a first edge signal, which is the reproduction signal at the groove trailing edge position of said groove portion or said inter-groove portion or both said groove portion and said inter-groove portion, and a second edge signal which is the reproduction signal at the groove leading edge position of said groove portion or said inter-groove portion or both said groove portion and said inter-groove portion;
• an edge signal interval measurement step of measuring the time interval between said first edge signal and said second edge signal and of outputting a second edge signal interval value which is the measured value;
• a computation step of receiving said second edge signal interval value, and of calculating and outputting a first wobble pit signal interval value and a second wobble pit signal interval value which are values nearly proportional to said second edge signal interval value;
• a first wobble pit signal detection step of detecting said reproduction signal at first timing derived on the basis of at least said first edge signal or said second edge signal and said first wobble pit signal interval value and of outputting a first wobble pit signal which is the detected reproduction signal;
• a second wobble pit signal detection step of detecting said reproduction signal at second timing derived on the basis of at least said first edge signal or said second edge signal and said second wobble pit signal interval value and of outputting a second wobble pit signal which is the detected reproduction signal;
• and
• a differential signal generation step of carrying out a subtraction between said first wobble pit signal and said second wobble pit signal and of generating a differential signal.

(After amendment) A disc-shaped information recording medium control method comprising:

• a reproduction step of outputting a reproduction signal including information of a first clock pit, a second clock pit, and one or more pre-pits disposed in a region between said first clock pit and said second clock pit, which are formed on a disc-shaped information recording medium;
• a clock pit signal detection step of detecting a first clock pit signal, which is the reproduction signal of said first clock pit, and a second clock pit signal which is the reproduction signal of said second clock pit from said pre-pits reproduction signal;
• a clock pit signal interval measurement step of measuring the time interval between said first clock pit signal and said second clock pit signal and of outputting a second clock pit signal interval value which is the measured value of said time interval between said first clock pit signal and said second clock pit signal;
• and
• a rotation step of rotating said disc-shaped information recording medium so that said second clock pit signal interval value becomes a constant value.

(After amendment) A disc-shaped information recording medium control method comprising:

• a reproduction step of outputting the reproduction signal of a groove portion or an inter-groove portion or both a groove portion and an inter-groove portion, formed on a disc-shaped information recording medium and divided by a pre-pit region;
• an edge signal detection step of detecting, from said reproduction signal, a first edge signal, which is the reproduction signal at the leading edge of said pre-pit region, and a second edge signal which is the reproduction signal at the trailing edge of said pre-pit region;
• an edge signal interval measurement step of measuring the time interval between said first edge signal and said second edge signal and of outputting a second edge signal interval value which is the measured value of said time interval between said first edge signal and said second edge signal;
• and
• a rotation step of rotating said disc-shaped information recording medium so that said second edge signal interval value becomes a constant value.

(Added) A disc-shaped information recording medium control apparatus comprising:

• a reproduction portion of outputting a reproduction signal including information of a first clock pit formed on a disc-shaped information recording medium;
• a clock pit signal detection portion of detecting a first clock pit signal which is the reproduction signal of said first clock pit from said reproduction signal;
• and
• a first clock pit signal interval measurement portion of measuring the time interval between two adjacent signals of said first clock pit signals and of outputting a first clock pit signal interval value which is the measured value, wherein
• said disc-shaped information recording medium is rotated so that said first clock pit signal interval value becomes a constant value.

(Added) A disc-shaped information recording medium control apparatus comprising:

• a reproduction portion of outputting the reproduction signal of a groove portion or an inter-groove portion or both a groove portion and an inter-groove portion, formed on a disc-shaped information recording medium and divided by a pre-pit region;
• an edge signal detection portion of detecting, from said reproduction signal, a first edge signal which is the reproduction signal at the leading edge or trailing edge of said pre-pit region;
• and
• a first edge signal interval measurement portion of measuring the time interval between two adjacent signals of said first edge signals and of outputting a first edge signal interval value which is the measured value, wherein
• said disc-shaped information recording medium is rotated so that said first edge signal interval value becomes a constant value.

(Added) A disc-shaped information recording medium control method comprising:

• a reproduction step of outputting a reproduction signal including information of a first clock pit formed on a disc-shaped information recording medium;
• a clock pit signal detection step of detecting a first clock pit signal which is the reproduction signal of said first clock pit;
• a first clock pit signal interval measurement step of measuring the time interval between two adjacent signals of said first clock pit signals and of outputting a first clock pit signal interval value which is the measured value;
• and
• a step of rotating said disc-shaped information recording medium so that said first clock pit signal interval value becomes a constant value.

(Added) A disc-shaped information recording medium control method comprising:

• a reproduction step of outputting the reproduction signal of a groove portion or an inter-groove portion or both a groove portion and an inter-groove portion formed on a disc-shaped information recording medium and divided by a pre-pit region;
• an edge signal detection step of detecting, from said reproduction signal, a first edge signal which is the reproduction signal at the leading edge or trailing edge of said pre-pit region;.
• a first edge signal interval measurement step of measuring the time interval between two adjacent signals of said first edge signals and of outputting a first edge signal interval value which is the measured value;
• and
• a step of rotating said disc-shaped information recording medium so that said first edge signal interval value becomes a constant value.