Data reproduction apparatus
AssigneeFujitsu Limited
InventorsSatoshi Furuta, Shigenori Yanagi
Life of this patent
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Abstract
A data reproduction apparatus includes first and second sampling parts which sample a reproduced signal from a recording medium in synchronism with first and second clock signals synchronizing respectively with leading and trailing edges of the reproduced signal and output leading and trailing sampled values, respectively, and a combination part which generates combined sampled values based on the leading and trailing sampled values. Recorded data is reproduced based on transition states of the combined sampled values output from the combination part in accordance with a maximum likelihood decoding technique corresponding to a predetermined partial response waveform.
Claims13
A data reproduction apparatus comprising:
- first and second sampling parts which sample a reproduced signal from a recording medium in synchronism with first and second clock signals synchronizing respectively with leading and trailing edges of the reproduced signal and output leading and trailing sampled values, respectively;
- and
- a combination part which generates combined sampled values based on the leading and trailing sampled values,
- wherein recorded data is reproduced based on transition states of the combined sampled values output from said combination part in accordance with a maximum likelihood decoding technique corresponding to a predetermined partial response waveform.
A data recording and reproduction apparatus comprising:
- a data recording unit;
- and
- a data reproduction unit,
- said data reproduction unit comprising:
- first and second sampling parts which sample a reproduced signal from a recording medium in synchronism with first and second clock signals synchronizing respectively with leading and trailing edges of the reproduced signal and output leading and trailing sampled values, respectively;
- a combination part which generates combined sampled values based on the leading and trailing sampled values;
- first and second maximum likelihood decoding parts;
- and
- a sampled value supply control part supplying the leading and trailing sampled values to said first and second maximum likelihood decoding parts, respectively, in a first operation mode for setting recording conditions in said recording unit and supplying the leading and trailing sampled values to said combination part and the combined sampled values output from said combination part to said first maximum likelihood decoding parts in a second operation mode for reproducing recorded data, wherein:
- the recording conditions are determined based on data obtained in said first and second maximum likelihood decoding parts in the first operation mode;
- and
- said first maximum likelihood decoding part reproduces the recorded data based on transition states of the combined sampled values in accordance with a maximum likelihood decoding technique corresponding to a predetermined partial response waveform in the second operation mode.
Dependencies are inferred from the claim text.