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US 7,257,059 B2Granted
Demodulator, optical disk drive and semiconductor integrated circuit
AssigneeKabushiki Kaisha Toshiba
InventorToshihiko Kaneshige
Life of this patent
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Abstract
A demodulator includes a wobble signal processor configured to convert a waveform of a wobble signal, and to generate a clock and a reference value based on a converted wobble signal. A sampling circuit is configured to sample the converted wobble signal by using the clock, and to generate a sampled signal. A viterbi decoder is configured to decode an auxiliary recording signal superposed on an optical disk by using the reference value and the sampled signal.
Claims20
A demodulator comprising:
- a wobble signal processor configured to convert a waveform of a wobble signal, and to generate a clock and a reference value based on a converted wobble signal;
- a sampling circuit configured to sample the converted wobble signal by using the clock, and to generate a sampled signal;
- and
- a viterbi decoder configured to decode an auxiliary recording signal superposed on an optical disk by using the reference value and the sampled signal.
1 more element
A semiconductor integrated circuit comprising:
- a wobble signal processor integrated on a semiconductor chip and configured to convert a waveform of a wobble signal, and to generate a clock and a reference value based on a converted wobble signal;
- a sampling circuit integrated on the semiconductor chip and configured to sample the converted wobble signal by using the clock, and to generate a sampled signal;
- and
- a viterbi decoder integrated on the semiconductor chip and configured to decode an auxiliary recording signal superposed on an optical disk by using the reference value and the sampled signal.
1 more element
An optical disk drive comprising:
- a pickup configured to receive light reflected from an optical disk, the reflected light generated by irradiating a laser beam on the optical disk;
- an RF amplifier configured to amplify a wobble signal generated by the pickup from the received light;
- a demodulator configured to generate a reference value and a sampled signal based on the wobble signal, and to subject an auxiliary recording signal superposed on the optical disk to viterbi decoding by using the reference value and the sampled signal;
- a servo controller configured to control an operation of the pickup;
- a reproducing/recording signal processor configured to carry out signal processing for reproducing or recording with the pickup;
- and
- a recording controller configured to control recording of a recording signal from the reproducing/recording signal processor onto the optical disk.
4 more elements
Dependencies are inferred from the claim text.