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31.发明授权System, method, and computer program product for characterizing media associated with data storage channels 有权用于表征与数据存储通道相关联的介质的系统，方法和计算机程序产品公开(公告)号：US08094397B2
公开(公告)日：2012-01-10
申请号：US12350108
申请日：2009-01-07
IPC分类号： G11B5/09
CPC分类号： G11B20/10009 , G11B20/10055 , G11B20/10175 , G11B20/10222 , G11B2220/90
摘要： A system in one embodiment includes multiple analog inputs for receiving readback signals, an analog to digital converter coupled to each of the analog inputs for converting the readback signals to digital signals, a buffer coupled to outputs of the analog to digital converters for at least temporarily storing the digital signals, and a digital processing section also coupled to outputs of the analog to digital converters for processing the digital signals for reconstructing data therefrom. A method in one embodiment includes receiving multiple channels of analog readback signals from a magnetic head, converting the analog signals in each channel to digital signals, buffering the digital signals, and outputting the buffered digital signals. A method in another embodiment includes receiving a readback waveform from a magnetic storage device, reducing a frequency offset of the readback waveform, and generating a synchronized, oversampled waveform from the readback waveform.
摘要翻译： 一个实施例中的系统包括用于接收回读信号的多个模拟输入，耦合到每个模拟输入的模数转换器，用于将回读信号转换成数字信号;耦合到模数转换器的输出的缓冲器，用于至少暂时地 存储数字信号，以及数字处理部分，其耦合到模数转换器的输出端，用于处理数字信号以从其重构数据。 一个实施例中的方法包括从磁头接收多个通道的模拟回读信号，将每个通道中的模拟信号转换成数字信号，缓冲数字信号，并输出缓冲的数字信号。 另一实施例中的方法包括从磁存储设备接收回读波形，减少回读波形的频率偏移，以及从回读波形生成同步的过采样波形。
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32.发明授权Apparatus, system, and method for adaptive asynchronous equalization using leakage 有权使用泄漏进行自适应异步均衡的装置，系统和方法公开(公告)号：US07596176B2
公开(公告)日：2009-09-29
申请号：US11263189
申请日：2005-10-31
IPC分类号： H03H7/30
CPC分类号： G11B20/10009 , G11B20/10046 , G11B20/10175 , G11B20/10481 , H04L25/03019 , H04L2025/03484 , H04L2025/03681
摘要： An apparatus, system, and method are disclosed for adaptive asynchronous equalization using leakage. An equalizer sums products of a plurality of tap signals from a delay line sampling a read signal and a plurality of corresponding tap coefficients to form an equalized signal in an asynchronous time domain having a first sampling rate. A leaky function module calculates a leaky function for each tap coefficient in the asynchronous time domain. An adaptation module adapts each of the tap coefficients as the leaky function for each tap coefficient summed with a signal-dependent updating function for each tap coefficient.
摘要翻译： 公开了一种使用泄漏进行自适应异步均衡的装置，系统和方法。 均衡器对来自对读取信号进行采样的延迟线和多个对应抽头系数的多个抽头信号的乘积相加，以在具有第一采样率的异步时域中形成均衡信号。 泄漏功能模块计算异步时域中每个抽头系数的泄漏函数。 适配模块将每个抽头系数适配为每个抽头系数的泄漏函数，用于针对每个抽头系数的与信号相关的更新函数相加。
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公开(公告)号：US07359135B2
公开(公告)日：2008-04-15
申请号：US11733934
申请日：2007-04-11
IPC分类号： G11B5/35
摘要： A read channel equalizer of a magnetic tape drive which equalizes digitally sampled magnetic signals detected by a read head is dynamically adapted. A detector of equalizer dynamic adaptation logic compares equalizer output signals to desired values that are based on the decoding scheme (such as +2, 0 and −2 for PR4) to sense equalizer output signals that are offset from at least one desired value, and signals the fact of each offset and it polarity as amplitude independent error signals. The signaled sensed amplitude independent error signals are fed back to adjustable taps of the equalizer. The simplified error signals thus avoid complex calculations of waveform errors, such as least mean square calculations. The error signals may be weighted and may be adjusted to align synchronously provided error signals with asynchronous taps of the equalizer.
摘要翻译： 磁头驱动器的读取通道均衡器，其均衡由读取头检测到的数字采样磁信号。 均衡器动态适配逻辑的检测器将均衡器输出信号与基于解码方案（例如PR4的+2,0和-2）的期望值进行比较，以感测与至少一个期望值偏移的均衡器输出信号，以及 将每个偏移的事实表示为与振幅无关的误差信号。 信号感知的与振幅无关的误差信号反馈到均衡器的可调节抽头。 因此，简化的误差信号避免了波形误差的复杂计算，例如最小均方根计算。 误差信号可以被加权并且可以被调整以使同步提供的误差信号与均衡器的异步抽头对齐。
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公开(公告)号：US07000167B2
公开(公告)日：2006-02-14
申请号：US10044624
申请日：2002-01-08
申请人： Jon Coker , Ajay Dholakia , Evangelos S. Eleftheriou , Rick Galbraith , Thomas Mittelholzer , Sedat Oelcer
发明人： Jon Coker , Ajay Dholakia , Evangelos S. Eleftheriou , Rick Galbraith , Thomas Mittelholzer , Sedat Oelcer
IPC分类号： H03M13/00
CPC分类号： H03M13/112 , H03M13/1117 , H03M13/1515 , H03M13/255 , H03M13/2906 , H03M13/6331 , H03M13/6583
摘要： A method for decoding Low Density Parity Check (LDPC) codes comprises executing a sum product algorithm to recover a set of information bits from an LDPC code represented as a bipartite graph of symbol nodes and check nodes, the sum product algorithm being responsive to input log likelihood ratios associated with the symbol nodes. The check nodes are updated by generating a set of forward difference metrics and a set of backward difference metrics in dependence on the ratios of logarithmic probabilities each associated with a corresponding symbol node of the LDPC code, updating each metric in the set of forward difference metrics in dependence on the absolute value of the log likelihood ratio associated with the symbol node and the absolute value of the previous metric in the set, updating each metric in the set of backward difference metrics in dependence on the absolute value of the log likelihood ratio associated with the symbol node and the absolute value of the previous metric in the set, and generating log likelihood ratios to be propagated back to each symbol node in dependence on the updated sets of forward and backward difference metrics.
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公开(公告)号：US06985536B2
公开(公告)日：2006-01-10
申请号：US10045810
申请日：2002-01-11
CPC分类号： H04L1/0057 , H04L1/007 , H04L27/3427
摘要： Methods, apparatus and systems for multilevel data communication comprises dividing a set of information bits to be transmitted into a first group and a second group; encoding the first group to generate a block code, selecting a subset of symbols in a constellation of symbols in dependence on the block code according to a Gray-coded mapping function, selecting a symbol within the subset in dependence on the second group according to a Gray-coded mapping function, and transmitting the selected symbol.
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36.发明授权公开(公告)号：US07684139B2
公开(公告)日：2010-03-23
申请号：US12166136
申请日：2008-07-01
IPC分类号： G11B5/035
CPC分类号： G11B20/10009 , G11B20/10027 , G11B20/10046 , G11B20/10055
摘要： A read channel and method using that read channel are disclosed. The read channel comprises an analog to digital converter which asynchronously samples at a fixed rate an analog signal formed by reading a data track, where that data track was written to a data storage medium at a symbol rate and an interpolator interconnected with the analog to digital converter. The read channel further comprises a fractionally-spaced equalizer, where the interpolator provides an interpolated signal to the fractionally-spaced equalizer at an interpolation rate, where that interpolation rate is greater than the symbol rate. The fractionally-spaced equalizer forms a synchronous equalized signal. The read channel further comprises a gain control module interconnected with the fractionally-spaced equalizer, and a sequence detector interconnected with the gain control module.
摘要翻译： 公开了使用该读通道的读通道和方法。 读通道包括模数转换器，其以固定速率异步采样通过读取数据轨道形成的模拟信号，其中数据轨道以符号速率写入数据存储介质，并且与模数转换器互连的内插器 转换器。 读通道还包括分数间隔的均衡器，其中内插器以内插速率向分数间隔的均衡器提供内插信号，其中该内插速率大于符号率。 分数间隔均衡器形成同步均衡信号。 读通道还包括与分数间隔均衡器互连的增益控制模块，以及与增益控制模块互连的序列检测器。
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公开(公告)号：US20080235562A1
公开(公告)日：2008-09-25
申请号：US11690635
申请日：2007-03-23
IPC分类号： H03M13/00
CPC分类号： G11B20/1426 , G11B20/1833 , G11B2020/1446 , G11B2220/2516 , G11B2220/90
摘要： Method and computer program product are provided to encode data for recording onto media whereby modulation and linear constraints from a concatenated code or product code are imposed. A first array of unencoded user data is generated. Each row is modulation encoded to enforce a first modulation constraint; the array is transformed into a second array which is transformed into a third array having predetermined empty locations in each column interleaved with the modulated data. A C2-parity byte is computed for at least some of the empty locations of the third array and a fourth array is generated. C1-parity symbols in each row are computed, generating a fifth array. A second modulation constraint is enforced on each C1-parity symbol in each row of the fifth array, generating a sixth array. The rows of the sixth array are assembled with header and sync fields for recording onto a recording media.
摘要翻译： 提供方法和计算机程序产品以对用于记录到介质上的数据进行编码，从而施加来自级联代码或产品代码的调制和线性约束。 生成第一组未编码的用户数据。 每行被调制编码以执行第一调制约束; 该阵列被变换成第二阵列，该第二阵列被转换成具有与调制数据交错的每列中的预定空位置的第三阵列。 对于第三阵列的至少一些空位置计算C2奇偶校验字节，并且生成第四阵列。 计算每行中的C1奇偶校验符号，生成第五个数组。 在第五阵列的每行中的每个C1奇偶校验符号上强制执行第二调制约束，产生第六阵列。 第六阵列的行与标题和同步字段组合，用于记录到记录介质上。
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公开(公告)号：US20080235556A1
公开(公告)日：2008-09-25
申请号：US11690619
申请日：2007-03-23
IPC分类号： H03M13/00
CPC分类号： H03M13/15 , G11B20/1426 , H03M13/2707 , H03M13/2721 , H03M13/275 , H03M13/2792 , H03M13/2909 , H03M13/53
摘要： A system is provided to encode data for recording onto media whereby modulation and linear constraints from a concatenated code or product code are imposed. A first array of unencoded user data is generated. Each row is modulation encoded to enforce a first modulation constraint; the array is transformed into a second array which is transformed into a third array having predetermined empty locations in each column interleaved with the modulated data. A C2-parity byte is computed for at least some of the empty locations of the third array and a fourth array is generated. C1-parity symbols in each row are computed, generating a fifth array. A second modulation constraint is enforced on each C1-parity symbol in each row of the fifth array, generating a sixth array. The rows of the sixth array are assembled with header and sync fields for recording onto a recording media.
摘要翻译： 提供了一种系统来编码用于记录到介质上的数据，由此施加来自级联代码或产品代码的调制和线性约束。 生成第一组未编码的用户数据。 每行被调制编码以执行第一调制约束; 该阵列被变换成第二阵列，该第二阵列被转换成具有与调制数据交错的每列中的预定空位置的第三阵列。 对于第三阵列的至少一些空位置计算C2奇偶校验字节，并且生成第四阵列。 计算每行中的C1奇偶校验符号，生成第五个数组。 在第五阵列的每行中的每个C1奇偶校验符号上强制执行第二调制约束，产生第六阵列。 第六阵列的行与标题和同步字段组合，用于记录到记录介质上。
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39.发明授权Magnetic tape servo format allowing for increased linear tape density and systems thereof 有权磁带伺服格式允许增加线性带密度及其系统公开(公告)号：US08446684B2
公开(公告)日：2013-05-21
申请号：US12691604
申请日：2010-01-21
申请人： Nhan X. Bui , Giovanni Cherubini , Evangelos S. Eleftheriou , Reed A. Hancock , Robert A. Hutchins
发明人： Nhan X. Bui , Giovanni Cherubini , Evangelos S. Eleftheriou , Reed A. Hancock , Robert A. Hutchins
IPC分类号： G11B5/09
CPC分类号： G11B21/103 , G11B5/584 , G11B15/18
摘要： According to one embodiment, a magnetic recording tape includes a plurality of servo tracks, each servo track comprising a series of magnetically defined bars having an average height of between about 80 microns and about 120 microns, wherein an average stripe angle of the bars is between about 10° and about 25°. A stripe angle is measured between a longitudinal axis of each respective bar and a line oriented perpendicular to a direction of tape travel and parallel to a plane of the tape, wherein an average stripe width of the bars is between about 1.0 micron and about 2.2 microns and an average servo frame length of groups of the bars comprising a servo frame is between about 120 microns and about 180 microns. In more embodiments, a servo format and a system including a servo format are disclosed, along with other embodiments of magnetic tapes.
摘要翻译： 根据一个实施例，磁记录带包括多个伺服轨道，每个伺服轨道包括一系列具有介于约80微米与约120微米之间的平均高度的磁力限定的杆，其中杆的平均条纹角在 约10°和约25°。 在每个相应的条的纵向轴线和垂直于带行进方向并且平行于带的平面定向的线之间测量条纹角度，其中条的平均条纹宽度在约1.0微米至约2.2微米之间 并且包括伺服框架的杆的组的平均伺服框架长度在大约120微米和大约180微米之间。 在更多实施例中，公开了伺服格式和包括伺服格式的系统以及磁带的其他实施例。
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40.发明申请MAGNETIC TAPE SERVO FORMAT ALLOWING FOR INCREASED LINEAR TAPE DENSITY AND SYSTEMS THEREOF 有权具有增加线性带密度的磁带服务器格式及其系统公开(公告)号：US20110176237A1
公开(公告)日：2011-07-21
申请号：US12691604
申请日：2010-01-21
申请人： Nhan X. Bui , Giovanni Cherubini , Evangelos S. Eleftheriou , Reed A. Hancock , Robert A. Hutchins
发明人： Nhan X. Bui , Giovanni Cherubini , Evangelos S. Eleftheriou , Reed A. Hancock , Robert A. Hutchins
CPC分类号： G11B21/103 , G11B5/584 , G11B15/18
摘要： According to one embodiment, a magnetic recording tape includes a plurality of servo tracks, each servo track comprising a series of magnetically defined bars having an average height of between about 80 microns and about 120 microns, wherein an average stripe angle of the bars is between about 10° and about 25°. A stripe angle is measured between a longitudinal axis of each respective bar and a line oriented perpendicular to a direction of tape travel and parallel to a plane of the tape, wherein an average stripe width of the bars is between about 1.0 micron and about 2.2 microns and an average servo frame length of groups of the bars comprising a servo frame is between about 120 microns and about 180 microns. In more embodiments, a servo format and a system including a servo format are disclosed, along with other embodiments of magnetic tapes.
摘要翻译： 根据一个实施例，磁记录带包括多个伺服轨道，每个伺服轨道包括一系列具有介于约80微米与约120微米之间的平均高度的磁力限定的杆，其中杆的平均条纹角在 约10°和约25°。 在每个相应的条的纵向轴线和垂直于带行进方向并且平行于带的平面定向的线之间测量条纹角度，其中条的平均条纹宽度在约1.0微米至约2.2微米之间 并且包括伺服框架的杆的组的平均伺服框架长度在大约120微米和大约180微米之间。 在更多实施例中，公开了伺服格式和包括伺服格式的系统以及磁带的其他实施例。
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