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1. 发明授权

US08908303B1 Method for servo demodulation and disk storage apparatus 有权
标题翻译：伺服解调和磁盘存储装置的方法
公开(公告)号：US08908303B1
公开(公告)日：2014-12-09
申请号：US14081908
申请日：2013-11-15
申请人： Kabushiki Kaisha Toshiba
发明人： Tomoyoshi Yamada
IPC分类号： G11B5/02 , G11B20/06 , G11B20/08 , G11B5/596
CPC分类号： G11B5/59688
摘要： According to one embodiment, in a method for servo demodulation, a first demodulated signal and a second demodulated signal, which are calculated from amplitude values of burst signal patterns of a first area and a second area, are generated in order to generate a position error signal of a reader, based on a servo pattern read from a disk by the reader. Further, in the method for servo demodulation, a square-root of sum of squares of the first and the second demodulated signals is calculated, and an optimal compensation coefficient of a linearity correction function to be used in linearity compensation of the position error signal is calculated based on a maximum value and a minimum value of the square-root of sum of squares.
摘要翻译：根据一个实施例，在一种用于伺服解调的方法中，产生从第一区域和第二区域的突发信号模式的幅度值计算出的第一解调信号和第二解调信号，以便产生位置误差读取器的信号，基于读取器从盘读取的伺服模式。此外，在伺服解调方法中，计算第一和第二解调信号的平方和的平方根，并且在位置误差信号的线性补偿中使用的线性校正函数的最佳补偿系数为基于平方和的平方根的最大值和最小值计算。

2. 发明授权

US09177581B2 Head position demodulation method and magnetic disk device 有权
标题翻译：磁头位置解调方法和磁盘装置
公开(公告)号：US09177581B2
公开(公告)日：2015-11-03
申请号：US14194482
申请日：2014-02-28
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Tomoyoshi Yamada
IPC分类号： G11B20/06 , G11B21/02 , G11B5/58 , G11B5/596 , G11B5/48
CPC分类号： G11B5/59688 , G11B5/4886
摘要： According to one embodiment, at demodulation of an A-phase burst pattern and a B-phase burst pattern arranged in a down-track direction so as to be different from each other in phase in a cross-track direction, the demodulated position of a magnetic head is calculated based on a sin component and a cos component in the A-phase burst pattern and a sin component and a cos component in the B-phase burst pattern.
摘要翻译：根据一个实施例，在A相脉冲串模式和布置在下行方向上以在交叉磁道方向上彼此相位不同的A相脉冲串模式和B相脉冲串模式的解调时，解调位置基于A相脉冲串图形中的sin分量和cos分量以及B相脉冲串图案中的sin分量和cos分量来计算磁头。

3. 发明授权

US08964325B1 Magnetic disk device and method for read/write offset error correction 有权
标题翻译：磁盘装置和读/写偏移纠错方法
公开(公告)号：US08964325B1
公开(公告)日：2015-02-24
申请号：US14197627
申请日：2014-03-05
申请人： Kabushiki Kaisha Toshiba
发明人： Tomoyoshi Yamada
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： A magnetic disk device according to an embodiment includes a head and a disk with a recording surface, the head including a reader configured to perform data reading, and a writer configured to write data. A method of correcting a read/write offset, according to the embodiment, is applied to the above magnetic disk device. This method includes reconstructing position data read by the reader, using a spline function, and correcting a read/write offset due to the distance between the writer and the reader, using the reconstructed position data.
摘要翻译：根据实施例的磁盘装置包括具有记录表面的磁头和磁盘，磁头包括被配置为执行数据读取的读取器，以及被配置为写入数据的写入器。根据实施例的校正读/写偏移的方法被应用于上述磁盘装置。该方法包括使用样条函数重构由读取器读取的位置数据，并且使用重构的位置数据来校正由于写入器和读取器之间的距离引起的读/写偏移。

4. 发明授权

US08848303B1 Disk storage apparatus and method for servo demodulation 有权
标题翻译：磁盘存储装置及伺服解调方法
公开(公告)号：US08848303B1
公开(公告)日：2014-09-30
申请号：US14018212
申请日：2013-09-04
申请人： Kabushiki Kaisha Toshiba
发明人： Tomoyoshi Yamada
IPC分类号： G11B5/02
CPC分类号： G11B5/59644
摘要： According to an embodiment, a disk storage apparatus includes a disk with a servo pattern recorded thereon and a processor. The processor offsets a reader in a cross-track direction on the disk and performs a discrete Fourier transform (DFT) operation on an amplitude sequence of readback signals with respect to the cross-track direction. The processor calculates an optimal correction coefficient for a linearity correction function used for a linearity correction of a position error signal based on a result of the DFT operation.
摘要翻译：根据实施例，盘存储装置包括其上记录有伺服图案的盘和处理器。处理器在磁盘上以交叉磁道方向偏移读取器，并对相对于交叉磁道方向的回读信号的幅度序列执行离散傅里叶变换（DFT）操作。处理器基于DFT操作的结果计算用于位置误差信号的线性校正的线性校正函数的最佳校正系数。

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