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    Self-adapting phase-locked loop filter for use in a read channel
    2.
    发明授权
    Self-adapting phase-locked loop filter for use in a read channel 有权
    用于读通道的自适应锁相环滤波器

    公开(公告)号：US09525576B1

    公开(公告)日：2016-12-20

    申请号：US14808736

    申请日：2015-07-24

    Applicant: Seagate Technology LLC

    Inventor： Ara Patapoutian ,  Belkacem Derras ,  William Michael Radich ,  Michael J. Link ,  Bruce Douglas Buch

    IPC: H04L27/148 ,  H04L7/033

    CPC classification number: H04L7/033 ,  H03L7/00 ,  H03L7/0807 ,  H03L7/091 ,  H03L7/093 ,  H03L7/107 ,  H04L1/0016 ,  H04L7/0332 ,  H04L27/148 ,  H04L43/16

    Abstract: A phase-locked loop (PLL) filter of a read channel includes a filter portion having an input coupled to delay circuitry having an output. The input of the filter portion is configured to receive a phase error signal. A look-up table is coupled to the filter portion. The look-up table comprises phase coefficients and frequency coefficients associated with a plurality of phase error magnitudes. The look-up table is configured to provide one or both of a selected phase coefficient and a selected frequency coefficient based on a magnitude of the phase error signal. The PLL filter is configured to adjust a bandwidth of the filter portion using one or both of the selected phase coefficient and the selected frequency coefficient. A phase signal indicative of estimated phase disturbance is produced at the output of the delay circuitry.

    Abstract translation: 读通道的锁相环（PLL）滤波器包括具有耦合到具有输出的延迟电路的输入的滤波器部分。 滤波器部分的输入被配置为接收相位误差信号。 查找表连接到过滤器部分。 查找表包括与多个相位误差量值相关联的相位系数和频率系数。 查找表被配置为基于相位误差信号的幅度提供所选择的相位系数和所选择的频率系数中的一个或两个。 PLL滤波器被配置为使用选择的相位系数和所选频率系数中的一个或两个来调整滤波器部分的带宽。 在延迟电路的输出处产生指示估计相位扰动的相位信号。

    Noise cancellation using cross-track scans
    5.
    发明授权
    Noise cancellation using cross-track scans 有权
    使用交叉轨迹扫描消除噪音

    公开(公告)号：US08913341B1

    公开(公告)日：2014-12-16

    申请号：US13956043

    申请日：2013-07-31

    Applicant: Seagate Technology LLC

    Inventor： Jason C. Jury ,  Michael J. Link

    IPC: G11B21/02 ,  G11B20/10

    CPC classification number: G11B20/10046

    Abstract: Multiple signals are read, respectively, from multiple different cross-track positions of a track of a magnetic medium. Weighting coefficients for each of the multiple signals are determined. The weighting coefficients are applied to the respective signals to form weighted signals. The weighted signals are combined and the combined signal is used to recover data stored in the track.

    Abstract translation: 分别从磁介质的磁道的多个不同的交叉轨道位置读取多个信号。 确定多个信号中的每一个的加权系数。 加权系数被施加到各个信号以形成加权信号。 加权信号被组合，并且组合信号用于恢复存储在轨道中的数据。

    PHASE ERROR RECOVERY CIRCUITRY AND METHOD FOR A MAGNETIC RECORDING DEVICE
    8.
    发明申请
    PHASE ERROR RECOVERY CIRCUITRY AND METHOD FOR A MAGNETIC RECORDING DEVICE 有权
    相位误差恢复电路和磁记录装置的方法

    公开(公告)号：US20170025147A1

    公开(公告)日：2017-01-26

    申请号：US14808721

    申请日：2015-07-24

    Applicant: Seagate Technology LLC

    Inventor： Michael J. Link ,  Bruce Douglas Buch ,  Belkacem Derras

    IPC: G11B20/10 ,  G11B20/18 ,  G11B5/09

    CPC classification number: G11B20/1024 ,  G11B5/09 ,  G11B20/1816 ,  G11B2005/0021 ,  G11B2020/183

    Abstract: A recording head is configured to write and read data sectors to and from a recording medium, such as a heat-assisted recording medium. A read channel is coupled to the recording head. Phase-locked loop (PLL) circuitry of the read channel is configured to detect a change in a phase error at a location of the data sector. The phase error change may be indicative of a mode-hop that occurred while writing the data sector to the medium. The PLL circuitry is configured to determine a phase offset using the phase error. A controller is configured to effect re-reading of the data sector location using the phase offset to recover the data sector location.

    Abstract translation: 记录头被配置为向诸如热辅助记录介质的记录介质写入和读取数据扇区。 读通道耦合到记录头。 读通道的锁相环（PLL）电路被配置为检测数据扇区位置处的相位误差的变化。 相位误差变化可以指示在将数据扇区写入介质时发生的模式跳跃。 PLL电路被配置为使用相位误差来确定相位偏移。 控制器被配置为使用相位偏移来重新读取数据扇区位置，以恢复数据扇区位置。

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