Disk apparatus and signal processing method
OwnerShintaro Takeharainventor
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Abstract
A disk apparatus according to one aspect of this invention comprises a photodetection unit configured to divisionally detect light reflected by the disk as a plurality of photodetection signals, and a tracking error signal generation unit configured to generate a tracking error signal on the basis of a phase difference between the plurality of photodetection signals detected by the photodetection unit, wherein the tracking error signal generation unit includes an equalization unit configured to equalize waveforms of the plurality of photodetection signals detected by the photodetection unit, and the equalization unit has frequency-gain characteristics that obtain a gain of not less than 15 dB at a frequency corresponding to a shortest pit or mark.
Claims16
A disk apparatus for reproducing a disk on which information is recorded by pits or marks with various lengths, comprising:
- a photodetection unit configured to divisionally detect light reflected by the disk as a plurality of photodetection signals;
- and
- a tracking error signal generation unit configured to generate a tracking error signal on the basis of a phase difference between the plurality of photo-detection signals detected by the photodetection unit,
- wherein the tracking error signal generation unit includes:
- an equalization unit configured to equalize waveforms of the plurality of photodetection signals detected by the photodetection unit, and
- the equalization unit has frequency-gain characteristics that obtain a gain of not less than 15 dB at a frequency corresponding to a shortest pit or mark.
An information processing method for processing a signal read out from a disk on which information is recorded by pits or marks with various lengths, comprising:
- divisionally detecting light reflected by the disk as a plurality of photodetection signals;
- equalizing waveforms of the plurality of detected photodetection signals by an equalizer having frequency-gain characteristics that obtain a gain of not less than 15 dB at a frequency corresponding to a shortest pit or mark;
- and
- generating a tracking error signal on the basis of a phase difference between the plurality of equalized signals.
Dependencies are inferred from the claim text.