Digital data decoding apparatus and digital data decoding method
AssigneeKabushiki Kaisha Toshiba
InventorNorikatsu Chiba
Life of this patent
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Abstract
According to one embodiment, a digital data decoding apparatus has a path computing device adding branch metrics of all paths in an input data series from the path at a state of a current time to the path at a state of a next time to path metrics of the paths corresponding to the branch metrics to obtain the path metrics of all the paths up to the path at the state of the next time and selecting a maximum-likelihood path from among the paths based on the obtained path metrics, and a branch metric calculating device calculating the branch metrics based on a state transition diagram in which a minimum mark/space length is limited to “2” and an equalization characteristic of PR (s, t, 2s, t, s) is provided.
Claims15
A digital data decoding apparatus comprising:
- a path computing device configured to add branch metrics of all paths in an input data series from the path at a state of a current time to the path at a state of a next time to path metrics of the paths corresponding to the branch metrics to obtain the path metrics of all the paths up to the path at the state of the next time and further configured to select a maximum-likelihood path from among the paths based at least in part on the obtained path metrics;
- and
- a branch metric calculating device configured to calculate the branch metrics based at least in part on a state transition diagram in which a minimum mark/space length is limited to “2” and an equalization characteristic of PR (s, t, 2s, t, s) is provided.
A digital data decoding apparatus comprising:
- a path computing device configured to add branch metrics of all paths in an input data series from the path at a state of a current time to the path at a state of a next time to path metrics of the paths corresponding to the branch metrics to obtain the path metrics of all the paths up to the path at the state of the next time and further configured to select a maximum-likelihood path from among the paths based at least in part on the obtained path metrics;
- and
- a branch metric calculating device configured to calculate the branch metrics based at least in part on a trellis diagram in which a minimum mark/space length is limited to “2” and equalization characteristics of both PR (s, t, 2s, t, s) and PR (s, t, t, s) are provided.
A digital data decoding method comprising:
- adding branch metrics of all paths in an input data series from the path at a state of a current time to the path at a state of a next time to path metrics of the paths corresponding to the branch metrics to obtain the path metrics of all the paths up to the path at the state of the next time, and selecting a maximum-likelihood path from among the paths based at least in part on the obtained path metrics;
- and
- calculating the branch metrics based at least in part on a state transition diagram in which a minimum mark/space length is limited to “2” and an equalization characteristic of PR (s, t, 2s, t, s) is provided.
Dependencies are inferred from the claim text.