Information detection device and optical disc device
AssigneeRenesas Electronics Corporation
InventorHiromi Honma
Life of this patent
Estimating the term…
Abstract
An information detection device includes an equalizer that equalizes the readout signal to a PR channel having equalization target levels of four or more values, and a Viterbi detector. The Viterbi detector generates branch metrics with the equalization target levels as reference levels to determine recording data from an output of the equalizer. The Viterbi detector has a mode of generating the branch metrics and determining the recording data by limiting at least one out of a maximum value and a minimum value of the equalization target levels.
Claims8
An information detection device for discriminating recording data from a readout signal of an information recording medium, comprising:
- an equalizer that equalizes said readout signal in a Partial Response PR channel having equalization target levels of four or more values;
- and
- a Viterbi detector that generates a branch metric, with said equalization target levels as reference levels, to determine recording data from an output of said equalizer;
- said Viterbi detector having a mode of generating said branch metric to determine said recording data by limiting at least one out of a maximum value and a minimum value of said equalization target levels.
Dependencies are inferred from the claim text.