Apparatus and method for optical disk reproduction
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiromichi Ishibashi, Takashi Kishimoto, Takuya Asano
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Abstract
An apparatus of the present invention is an optical disk apparatus for irradiating with a laser beam an optical disk on which address marks are recorded at intervals based on a pulse width modulation method and for reproducing data from a reproduced signal based on reflected light. The apparatus includes: a pulse signal reproduction section for producing a reproduced pulse signal from the reproduced signal based on a threshold value; a threshold value production section for producing the threshold value based on the reproduced pulse signal; and a gate signal production section for producing an address gate signal at a timing when the address mark is reproduced.
Claims14
An optical disk apparatus for irradiating with a laser beam an optical disk on which address marks are recorded at intervals based on a pulse width modulation method and for reproducing data from a reproduced signal based on reflected light, the apparatus comprising:
- a pulse signal reproduction section for producing a reproduced pulse signal from the reproduced signal based an a threshold value;
- a gate signal production section for producing an address gate signal at a timing when the address mark is reproduced;
- and
- a threshold value production section for producing the threshold value based on the reproduced pulse signal and the address gate signal.
A method for reproducing an optical disk, for irradiating with a laser beam an optical disk on which address marks are recorded at intervals based on a pulse width modulation method and for reproducing data from a reproduced signal based on reflected light, the method comprising the steps of:
- producing a reproduced pulse signal from the reproduced signal based on a threshold value;
- producing an address gate signal at a timing when the address mark is reproduced;
- and
- producing the threshold value based on the reproduced pulse signal and the address gate signal.
Dependencies are inferred from the claim text.