Optical disk apparatus and tracking error signal generating method
AssigneeKabushiki Kaisha Toshiba
InventorsHiroshi Nakane, Takeshi Nakano
Life of this patent
Estimating the term…
Abstract
A DPD tracking error generating section generates a DPD tracking error signal from a plurality of sense signals supplied from an optical sensor. A PP tracking error generating section generates a PP tracking error signal from a plurality of sense signals supplied from the optical sensor. The amplitude of each of the DPD tracking error signal and PP tracking error signal is adjusted suitably under the control of a CPU. The suitably adjusted signals are added by an adder, thereby generating a tracking error signal.
Claims12
An optical disk apparatus used as one of an apparatus for reproducing information, and an apparatus for recording and reproducing information, by projecting a light beam onto an optical disk, said optical disk apparatus comprising:
- an optical sensor which is composed of at least of one light sensing cell and which receives the light reflected from an optical disk and outputs optical sense signals corresponding to said light received;
- a first tracking error generating section which senses a phase difference between said optical sense signals outputted from said optical sensor and which generates a first tracking error signal from said optical sense signals;
- a second tracking error generating section which senses a level difference between said optical sense signals outputted from said optical sensor and which generates a second tracking error signal from said optical sense signals;
- a combining section which combines the first tracking error signal generated by said first tracking error generating section and the second tracking error signal generated by said second tracking error generating section and outputs the combined tracking signal;
- and
- a tracking control section which performs tracking control using the combined tracking signal supplied from said combining section.
A tracking error signal generating method in an optical disk apparatus used as one of an apparatus for reproducing information, and an apparatus for recording and reproducing information, by projecting a light beam onto an optical disk, said tracking error signal generating method comprising:
- receiving the light reflected from an optical disk with at least of one light sensing cell and outputting optical sense signals on the basis of said light received;
- sensing a phase difference between said optical sense signals and generating a first tracking error signal;
- sensing a level difference between said optical sense signals and generating a second tracking error signal;
- muting said first tracking error signal and adjusting the amplitude of said second tracking error signal;
- and
- combining said first tracking error signal and said second tracking error signal and supplying the combined tracking error signal.
An optical disk apparatus used as one of an apparatus for reproducing information, and an apparatus for recording and reproducing information, by projecting a light beam onto an optical disk, the optical disk apparatus comprising:
- an optical sensor which is composed of at least one light sensing cell and which receives the light reflected from an optical disk and outputs optical sense signals on the basis of the received light;
- a first tracking error generating section which senses a phase difference between the optical sense signals outputted from the optical sensor and generates a first tracking error signal from the optical sense signals;
- a second tracking error generating section which senses a level difference between the optical sense signals outputted from the optical sensor and generates a second tracking error signal from the optical sense signals;
- a mute section which mutes either the first tracking error signal or the second tracking error signal on the basis of the recorded area and unrecorded area of the optical disk or the depth of a pit;
- and
- a tracking control section which performs tracking control using the tracking error signal not muted by the mute section.
A method of generating a tracking error signal in an optical disk apparatus used as one of an apparatus for reproducing information, and an apparatus for recording and reproducing information, by projecting a light beam onto an optical disk, the method comprising:
- causing at least one light sensing cell to receive the light reflected from an optical disk and outputting optical sense signals on the basis of the light received by the light sensing cell;
- sensing a phase difference between the optical sense signals and generating a first tracking error signal;
- sensing a level difference between the optical sense signals and generating a second tracking error signal;
- muting either the first tracking error signal or the second tracking error signal on the basis of the recorded area and unrecorded area of the optical disk or the depth of a pit;
- and
- offering the tracking error signal not muted in the muting step as a final tracking error signal.
Dependencies are inferred from the claim text.