Playback data detecting device
AssigneeNEC Corporation
InventorSatoshi Itoi
Life of this patent
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Abstract
The PR(1, 1) equalizer 1 receives signals which are provided from a playback head which detects data in which the number of continuous non-inverse bits is at least “2”. The PR(1, 1) equalizer 1 then converts the signals into seven levels of data and ten levels of data, provides them to the four states of Viterbi decoder 2. In Viterbi decoding, an weight is applied to a metric which is obtained from the seven levels of data or the ten levels of data.
Claims27
A playback data detecting device which playsback recording data which are recorded using signals in which the number of continuous non-inverse signals is at least “2”, comprising:
- a PR(1, 1) equalizer which receives playback signals of the recording data, converts the signals into three levels of data and two levels of data which resides in the intermediate point between the three levels of data in time;
- and
- a four state Viterbi decoder which performs Viterbi decoding based on transition rules for transition of playback states S0, S1, S2, and S3, which correspond to the three levels of data and the two levels of data.
A playback data detecting device which playsback recording data which are recorded using signals in which the number of continuous non-inverse signals is at least “2”, comprising:
- a PR(1, 2, 1) equalizer which receives playback signals of the recording data, converts the signals into four levels of data and seven levels of data which resides in the intermediate point between the four levels of data in time;
- and
- a six state Viterbi decoder which performs Viterbi decoding based on transition rules for transition of playback states S0, S1, S2, S3, S4 and S5, which correspond to the four levels of data and the seven levels of data.
A playback data detecting device which playsback recording data which are recorded using signals in which the number of continuous non-inverse signals is at least “2”, comprising:
- a PR(1, 2, 2, 1) equalizer which receives playback signals of the recording data, converts the signals into seven levels of data and ten levels of data which resides in the intermediate point between the seven levels of data in time;
- and
- a ten state Viterbi decoder which performs Viterbi decoding based on transition rules for transition of playback states S0, S1, S2, S3, S4, S5, S6, S7, S8 and S9, which correspond to the seven levels of data and the ten levels of data.
Dependencies are inferred from the claim text.