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    • 4. 发明授权
    • Systems and methods for storage channel testing
    • 存储通道测试的系统和方法
    • US07990642B2
    • 2011-08-02
    • US12425757
    • 2009-04-17
    • Yuan Xing LeeGeorge MathewShaohua YangHongwei SongWeijun TanHao Zhong
    • Yuan Xing LeeGeorge MathewShaohua YangHongwei SongWeijun TanHao Zhong
    • G11B27/36
    • G11B20/182G11B2220/2516
    • Various embodiments of the present invention provide systems and methods for validating elements of storage devices. A an example, various embodiments of the present invention provide semiconductor devices that include a write path circuit, a read path circuit and a validation circuit. The write path circuit is operable to receive a data input and to convert the data input into write data suitable for storage to a storage medium. The read path circuit is operable to receive read data and to convert the read data into a data output. The validation circuit is operable to: receive the write data, augment the write data with a first noise sequence to yield a first augmented data series; and augment a derivative of the first augmented data series with a second noise sequence to yield the read data.
    • 本发明的各种实施例提供用于验证存储设备的元件的系统和方法。 作为示例,本发明的各种实施例提供包括写入路径电路,读取路径电路和验证电路的半导体器件。 写入路径电路可操作用于接收数据输入并将数据输入转换成适合于存储的写数据到存储介质。 读路径电路可操作以接收读数据并将读数据转换为数据输出。 验证电路可操作以:接收写入数据,用第一噪声序列增加写入数据以产生第一增强数据序列; 并且用第二噪声序列来增加第一增强数据序列的导数以产生读取的数据。
    • 6. 发明申请
    • Systems and Methods for Adaptive Write Pre-Compensation
    • 自适应写预补偿的系统和方法
    • US20100053793A1
    • 2010-03-04
    • US12199325
    • 2008-08-27
    • George MathewYuan Xing LeeHongwei Song
    • George MathewYuan Xing LeeHongwei Song
    • G11B5/09
    • G11B5/09G11B20/10194
    • Various embodiments of the present invention provide systems and methods for write pre-compensation. For example, various embodiments of the present invention provide methods for modifying magnetic information transfer. The methods include retrieving magnetically represented data from a storage medium, and converting the magnetically represented data to a series of data samples. A preceding pattern and a transition status is identified in the series of data samples, and an equalized channel response is computed based on an estimated NLTS value. An error value is computed that corresponds to a difference between the estimated NLTS value and an actual NLTS value, and a pre-compensation value is computed based at least in part on the error value.
    • 本发明的各种实施例提供了用于写入预补偿的系统和方法。 例如,本发明的各种实施例提供了用于修改磁信息传输的方法。 所述方法包括从存储介质检索磁性表示的数据,并将磁性表示的数据转换成一系列数据样本。 在一系列数据样本中识别出先前的模式和转变状态,并且基于估计的NLTS值来计算均衡的信道响应。 计算对应于估计的NLTS值和实际NLTS值之间的差异的误差值,并且至少部分地基于误差值计算预补偿值。
    • 8. 发明授权
    • Systems and methods for adaptive CBD estimation in a storage device
    • 存储设备中自适应CBD估计的系统和方法
    • US08154818B2
    • 2012-04-10
    • US12663345
    • 2008-10-20
    • George MathewYuan Xing LeeHongwei SongJefferson E. Singleton
    • George MathewYuan Xing LeeHongwei SongJefferson E. Singleton
    • G11B21/02
    • G11B5/6029
    • Various embodiments of the present invention provide systems and methods for adaptive channel bit density estimation. For example, various embodiments of the present invention provide methods for adaptively estimating channel bit density. Such methods include providing a storage medium (178) that includes information corresponding to a process data set, and accessing the process data set from the storage medium (505). A first channel bit density estimate (535) is computed based at least in part on a first portion of the process data set (520-530), and a second channel bit density estimate (535) is calculated based at least in part on the first portion of the process data set, a second portion of the process data set (520-530) and the first channel bit density estimate (535).
    • 本发明的各种实施例提供了用于自适应信道比特密度估计的系统和方法。 例如,本发明的各种实施例提供了自适应地估计信道比特密度的方法。 这样的方法包括提供包括与过程数据集相对应的信息的存储介质(178),以及从存储介质(505)访问过程数据集。 至少部分地基于过程数据集(520-530)的第一部分来计算第一信道比特密度估计(535),并且至少部分地基于所述第二信道比特密度估计 过程数据集的第一部分,过程数据集(520-530)的第二部分和第一信道比特密度估计(535)。
    • 10. 发明授权
    • Fly-height control using asynchronous sampling
    • 飞高控制采用异步采样
    • US08077427B2
    • 2011-12-13
    • US12758122
    • 2010-04-12
    • George MathewJeffrey GrundvigHongwei SongYuan Xing Lee
    • George MathewJeffrey GrundvigHongwei SongYuan Xing Lee
    • G11B5/60
    • G11B5/6029G11B5/012G11B5/6064
    • In one embodiment, a hard-disk drive system performs fly-height control using a read-back mode and a loop-back mode. The read-back mode measures first and second harmonics pre-recorded on the medium and divides the first measurement by the second to obtain a read-back mode harmonic ratio. The loop-back mode measures the same first and second harmonics; however, the harmonics are provided by a write precompensation circuit rather than the medium. Further, the loop-back mode measurements are performed using asynchronous sampling to address aliasing and quantization errors. The first measurement is divided by the second to generate a loop-back harmonic ratio. In logarithm domain, the loop-back ratio is subtracted from the read-back mode ratio to remove environment-induced variations in the read path electronic circuits. The resulting harmonic ratio is subtracted from an initial harmonic ratio determined, for example, during manufacturing, to determine how much the harmonic ratio has changed.
    • 在一个实施例中,硬盘驱动器系统使用回读模式和循环模式来执行飞行高度控制。 回读模式测量在介质上预先记录的第一和第二次谐波,并将第一次测量除以秒,以获得回读模式谐波比。 环回模式测量相同的第一和第二谐波; 然而,谐波由写入预补偿电路而不是介质提供。 此外,使用异步采样来执行环回模式测量以解决混叠和量化误差。 第一次测量除以二次以产生回路谐波比。 在对数域中,从回读模式比率中减去回路比,以消除读取路径电子电路中的环境引起的变化。 从制造时例如确定的初始谐波比减去得到的谐波比,以确定谐波比已经改变了多少。