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    LDPC decoder with fractional unsatisfied check quality metric
    1.
    发明授权
    LDPC decoder with fractional unsatisfied check quality metric 有权
    具有分数不满足检验质量度量的LDPC解码器

    公开(公告)号：US08930788B2

    公开(公告)日：2015-01-06

    申请号：US13602463

    申请日：2012-09-04

    申请人： Fan Zhang ,  Ming Jin ,  Wu Chang ,  Haitao Xia

    发明人： Fan Zhang ,  Ming Jin ,  Wu Chang ,  Haitao Xia

    IPC分类号： H03M13/00

    CPC分类号： H03M13/6343 ,  H03M13/1111 ,  H03M13/1117 ,  H03M13/1128 ,  H03M13/1171 ,  H03M13/2957 ,  H03M13/658

    摘要： An apparatus includes a low density parity check decoder operable to iteratively generate messages between a plurality of check nodes and variable nodes, and to calculate a fractional quality metric for a data block as it is decoded in the low density parity check decoder based at least in part on perceived values of data in the variable nodes. The fractional unsatisfied check quality metric is a probabilistic determination of a number of unsatisfied parity checks in the low density parity check decoder.

    摘要翻译： 一种装置包括低密度奇偶校验解码器，其可操作以在多个校验节点和可变节点之间迭代地生成消息，并且在低密度奇偶校验解码器中解码时计算数据块的分数质量度量，至少基于 部分变量节点中数据的感知值。 分数不满足的检查质量度量是低密度奇偶校验解码器中的不满足奇偶校验的数量的概率确定。

    REAL TIME CLOSE LOOP FLY HEIGHT CONTROL
    3.
    发明申请
    REAL TIME CLOSE LOOP FLY HEIGHT CONTROL 审中-公开
    实时关闭环路飞行高度控制

    公开(公告)号：US20140055882A1

    公开(公告)日：2014-02-27

    申请号：US13593682

    申请日：2012-08-24

    申请人： Ming Jin ,  Fan Zhang ,  Haitao Xia ,  Wu Chang

    发明人： Ming Jin ,  Fan Zhang ,  Haitao Xia ,  Wu Chang

    IPC分类号： G11B21/02

    CPC分类号： G11B5/6029 ,  G11B5/607

    摘要： A device includes a disk drive assembly configured to store information using a platter comprising a magnetic material surface and a magnetic head disposed above the magnetic material surface. The magnetic head is configured to move across tracks formed on the platter to write information to the magnetic material surface and read information from the magnetic material surface. The device also includes a controller operatively coupled with the disk drive assembly. The controller is configured to dynamically adjust the height of the magnetic head above the magnetic material surface at each of the tracks by determining a harmonic ratio for a particular track and comparing the harmonic ratio to a reference harmonic ratio for the track. For example, the controller calculates a difference between the harmonic ratio and the reference harmonic ratio.

    摘要翻译： 一种设备包括：盘驱动器组件，其配置为使用包括磁性材料表面的盘片和设置在磁性材料表面上方的磁头来存储信息。 磁头构造成在形成在盘片上的轨道上移动以向磁性材料表面写入信息并从磁性材料表面读取信息。 该装置还包括与盘驱动器组件可操作地耦合的控制器。 控制器被配置为通过确定特定轨道的谐波比并将谐波比与轨道的基准谐波比进行比较来动态地调整磁道材料表面在每个轨道上方的高度。 例如，控制器计算谐波比和基准谐波比的差。