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    • 2. 发明授权
    • Systems and methods for memory efficient repeatable run out processing
    • 用于存储器高效可重复耗尽处理的系统和方法
    • US09305581B2
    • 2016-04-05
    • US12328024
    • 2008-12-04
    • Viswanath AnnampeduTerence KaraninkXun ZhangJeffrey P. Grundvig
    • Viswanath AnnampeduTerence KaraninkXun ZhangJeffrey P. Grundvig
    • G11B5/596
    • G11B5/59627
    • Various embodiments of the present invention provide systems and methods for low overhead disk wobble compensation. As an example, a method for performing synchronous wobble compensation processing is disclosed. The method includes providing a medium that includes a servo data region and a user data region. The servo data region includes a clock recovery pattern and a location pattern. A detectable pattern is written to the user data region a known number of bit periods from the location pattern. The detectable pattern is read back, and a fractional processing delay is calculated. Based at least on the fractional processing delay and a known number of bit periods from the location pattern to the end of the servo data region, a wobble compensation pattern is written an integral number of bit periods from the location pattern.
    • 本发明的各种实施例提供了用于低架空磁盘摆动补偿的系统和方法。 作为示例,公开了一种用于执行同步摆动补偿处理的方法。 该方法包括提供包括伺服数据区和用户数据区的介质。 伺服数据区域包括时钟恢复模式和位置​​模式。 将可检测图案从位置图案写入用户数据区域已知数量的位周期。 读取可检测图案,并计算分数处理延迟。 至少基于分数处理延迟和从位置模式到伺服数据区域的结束的已知数量的位周期,摆动补偿模式从位置模式写入整数个位周期。
    • 5. 发明授权
    • Systems and methods for servo data based harmonics calculation
    • 基于伺服数据的谐波计算的系统和方法
    • US08325432B2
    • 2012-12-04
    • US12851455
    • 2010-08-05
    • George MathewXun ZhangHongwei Song
    • George MathewXun ZhangHongwei Song
    • G11B27/36G11B21/02
    • G11B5/6029
    • Various embodiments of the present invention provide systems and methods for servo data based harmonics calculation. For example, a circuit for determining harmonics is disclosed that includes an analog to digital conversion circuit that provides a series of digital samples corresponding to a pattern within a servo data region of a storage medium, and a harmonic calculation circuit. The harmonic calculation circuit is operable to calculate a first harmonic value for the series of digital samples, calculate a second harmonic value for the series of digital samples, and calculate a ratio of the first harmonic value to the second harmonic value.
    • 本发明的各种实施例提供了用于基于伺服数据的谐波计算的系统和方法。 例如,公开了一种用于确定谐波的电路,其包括提供与存储介质的伺服数据区域内的模式相对应的一系列数字样本的模数转换电路和谐波计算电路。 谐波计算电路可操作地计算一系列数字采样的一次谐波值,计算一系列数字采样的二次谐波值,并计算一次谐波值与二次谐波值的比值。
    • 7. 发明授权
    • Methods and apparatus for gain estimation using servo data with improved bias correction
    • 使用改进的偏差校正的伺服数据进行增益估计的方法和装置
    • US08199422B2
    • 2012-06-12
    • US12847661
    • 2010-07-30
    • Viswanath AnnampeduXun Zhang
    • Viswanath AnnampeduXun Zhang
    • G11B20/10
    • G11B20/10305G11B20/10009
    • Methods and apparatus are provided for gain estimation using servo data with improved bias correction. The gain is estimated using a preamble in a servo sector by obtaining a first gain estimate using a first gain estimation algorithm (such as a Zero Gain Start Algorithm) and a first portion of the preamble; storing the first portion of the preamble in a memory buffer; obtaining a second gain estimate using a second gain estimation algorithm (such as a Zero Forcing algorithm) and the first portion of the preamble; and processing Servo Address Mark (SAM) and Gray data in the servo sector using the first gain estimate substantially simultaneous to the step of obtaining the second gain estimate. A gain error can be obtained by calculating a difference between the first gain estimate and the second gain estimate. The gain error can be used in burst processing of the servo data.
    • 提供了使用改进的偏差校正的伺服数据进行增益估计的方法和装置。 通过使用第一增益估计算法(例如零增益启动算法)和前同步码的第一部分获得第一增益估计,使用伺服扇区中的前导码估计增益; 将前导码的第一部分存储在存储器缓冲器中; 使用第二增益估计算法(例如零强制算法)和前导码的第一部分获得第二增益估计; 以及基本上与获得第二增益估计的步骤同时使用第一增益估计来处理伺服扇区中的伺服地址标记(SAM)和灰数据。 可以通过计算第一增益估计和第二增益估计之间的差来获得增益误差。 增益误差可用于伺服数据的突发处理。