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31.发明授权Method for an equalizer computation in a media system using a data set separator sequence 有权在使用数据集分隔符序列的媒体系统中进行均衡器计算的方法公开(公告)号：US07457355B2
公开(公告)日：2008-11-25
申请号：US11136872
申请日：2005-05-25
IPC分类号： H03H7/40
CPC分类号： G11B5/09 , G11B20/10009 , G11B20/10046 , G11B20/10481 , G11B2005/0013 , G11B2220/90
摘要： An equalizer coefficients generator receives a DSS sequence and a DSS readback sequence, which is a function of a channel processing of the DSS sequence by a read channel. The generator generates a coefficient cyclic equalizer vector as a function of the DSS sequence and the DSS readback sequence. The generator further generates an error signal as a function of a comparison of the DSS sequence and an equalization of the DSS readback sequence based on the coefficient cyclic equalizer vector. An unacceptable error signal indicates a need to adjust the coefficient cyclic equalizer vector to yield an acceptable comparison of the DSS sequence and an equalization of the DSS readback sequence based on the coefficient cyclic equalizer vector.
摘要翻译： 均衡器系数发生器接收DSS序列和DSS回读序列，DSS序列是通过读通道的DSS序列的信道处理的函数。 发生器产生作为DSS序列和DSS回读序列的函数的系数循环均衡器向量。 发生器还根据系数循环均衡器矢量，作为DSS序列与DSS回读序列的均衡的比较的函数产生误差信号。 不可接受的误差信号指示需要调整系数循环均衡器向量以产生DSS序列的可接受比较和基于系数循环均衡器向量的DSS回读序列的均衡。
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32.发明授权公开(公告)号：US07394608B2
公开(公告)日：2008-07-01
申请号：US11213127
申请日：2005-08-26
IPC分类号： G11B5/09
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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33.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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34.发明授权公开(公告)号：US08077764B2
公开(公告)日：2011-12-13
申请号：US12360777
申请日：2009-01-27
IPC分类号： H03H7/30
CPC分类号： H04L25/03299 , H04L25/03197 , H04L2025/03617
摘要： A 16-State adaptive NPML detector is provided for a tape drive which addresses weaknesses of a conventional fixed, 8-state EPR4 detector. Rather than having a fixed target channel, the detector is programmable to allow a range of target channels and can support “classical” partial response channels such as PR4 or EPR4 by programming predictor or whitening filter coefficients. In one embodiment, two filter coefficients may be set via XREG inputs or dynamically determined through the use of an LMS algorithm allowing the detector to adapt the predictor coefficients as data is being read. Another embodiment provides a detector for an EPR4 target in which the whitening filter has one coefficient. Components of the detection system include the detector itself, an LMS engine, a coefficient engine and a noise predictive or whitening filter. Coefficients from the LMS engine may be loaded or stored dynamically based upon conditions in the tape drive.
摘要翻译： 为磁带驱动器提供了16状态自适应NPML检测器，其解决了常规固定的8状态EPR4检测器的缺点。 不是具有固定的目标通道，检测器可编程以允许一定范围的目标通道，并且可以通过编程预测器或白化滤波器系数来支持“经典”部分响应通道，例如PR4或EPR4。 在一个实施例中，可以经由XREG输入来设置两个滤波器系数，或者通过使用LMS算法动态地确定，允许检测器在正在读取数据时调整预测器系数。 另一个实施例提供了一种用于EPR4目标的检测器，其中白化滤波器具有一个系数。 检测系统的组件包括检测器本身，LMS引擎，系数引擎和噪声预测或增白滤波器。 可以根据磁带驱动器中的条件动态地加载或存储来自LMS引擎的系数。
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35.发明申请DATA-DEPENDENT NOISE-PREDICTIVE MAXIMUM LIKELIHOOD DETECTION (DD-NPML) FOR MAGNETIC RECORDING 有权用于磁记录的数据依赖性噪声预测最大似然检测（DD-NPML）公开(公告)号：US20110242692A1
公开(公告)日：2011-10-06
申请号：US12753586
申请日：2010-04-02
IPC分类号： G11B27/36
CPC分类号： G11B20/10009 , G11B20/10046 , G11B20/10074 , G11B20/10175 , G11B20/10287 , G11B2220/90
摘要： In one embodiment, a method includes applying one or more whitening filters to an input stream of digitized samples from a magnetic data channel to produce a filtered sequence, performing one or more branch metric calculations to the filtered sequence to produce a branch metric, and applying a multi-state data-dependent noise-predictive maximum likelihood (DD-NPML) detector to the branch metric to produce an output stream. In another embodiment, a multi-channel data storage system includes a head for reading data from a storage medium, logic for applying one or more whitening filters to an input stream of digitized samples from a magnetic data channel to produce a filtered sequence, logic for performing one or more branch metric calculations to the filtered sequence to produce a branch metric, and logic for applying a multi-state DD-NPML detector to the branch metric to produce an output stream. Other systems and methods are described as well.
摘要翻译： 在一个实施例中，一种方法包括将一个或多个白化滤波器应用于来自磁数据信道的数字化样本的输入流，以产生经滤波的序列，对经滤波的序列执行一个或多个分支度量计算以产生分支度量，以及应用 用于产生输出流的分支度量的多状态数据相关噪声预测最大似然（DD-NPML）检测器。 在另一个实施例中，多通道数据存储系统包括用于从存储介质读取数据的头，用于将一个或多个白化滤波器应用于来自磁数据通道的数字化采样的输入流以产生滤波序列的逻辑，用于 对经滤波的序列执行一个或多个分支度量计算以产生分支度量，以及将多状态DD-NPML检测器应用于分支度量以产生输出流的逻辑。 还描述了其他系统和方法。
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36.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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37.发明申请公开(公告)号：US20100189169A1
公开(公告)日：2010-07-29
申请号：US12360777
申请日：2009-01-27
CPC分类号： H04L25/03299 , H04L25/03197 , H04L2025/03617
摘要： A 16-State adaptive NPML detector is provided for a tape drive which addresses weaknesses of a conventional fixed, 8-state EPR4 detector. Rather than having a fixed target channel, the detector is programmable to allow a range of target channels and can support “classical” partial response channels such as PR4 or EPR4 by programming predictor or whitening filter coefficients. In one embodiment, two filter coefficients may be set via XREG inputs or dynamically determined through the use of an LMS algorithm allowing the detector to adapt the predictor coefficients as data is being read. Another embodiment provides a detector for an EPR4 target in which the whitening filter has one coefficient. Components of the detection system include the detector itself, an LMS engine, a coefficient engine and a noise predictive or whitening filter. Coefficients from the LMS engine may be loaded or stored dynamically based upon conditions in the tape drive.
摘要翻译： 为磁带驱动器提供了16状态自适应NPML检测器，其解决了常规固定的8状态EPR4检测器的缺点。 不是具有固定的目标通道，检测器可编程以允许一定范围的目标通道，并且可以通过编程预测器或白化滤波器系数来支持“经典”部分响应通道，例如PR4或EPR4。 在一个实施例中，可以经由XREG输入来设置两个滤波器系数，或者通过使用LMS算法动态地确定，允许检测器在正在读取数据时调整预测器系数。 另一个实施例提供了一种用于EPR4目标的检测器，其中白化滤波器具有一个系数。 检测系统的组件包括检测器本身，LMS引擎，系数引擎和噪声预测或增白滤波器。 可以根据磁带驱动器中的条件动态地加载或存储来自LMS引擎的系数。
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38.发明申请METHOD FOR AN EQUALIZER COMPUTATION IN A MEDIA SYSTEM USING A DATA SET SEPARATOR SEQUENCE 有权使用数据集分离器序列在媒体系统中均衡器计算的方法公开(公告)号：US20090103202A1
公开(公告)日：2009-04-23
申请号：US12251373
申请日：2008-10-14
IPC分类号： G11B5/035
CPC分类号： G11B5/09 , G11B20/10009 , G11B20/10046 , G11B20/10481 , G11B2005/0013 , G11B2220/90
摘要： Provided is a method for receiving a DSS sequence and a DSS readback sequence, which is a function of a channel processing of the DSS sequence by a read channel. A coefficient cyclic equalizer vector is generated as a function of the DSS sequence and the DSS readback sequence. An error signal is generated as a function of a comparison of the DSS sequence and an equalization of the DSS readback sequence based on the coefficient cyclic equalizer vector. An unacceptable error signal indicates a need to adjust the coefficient cyclic equalizer vector to yield an acceptable comparison of the DSS sequence and an equalization of the DSS readback sequence based on the coefficient cyclic equalizer vector.
摘要翻译： 提供了一种用于接收DSS序列和DSS回读序列的方法，DSS序列是通过读取信道对DSS序列的信道处理的函数。 作为DSS序列和DSS回读序列的函数产生系数循环均衡器向量。 根据系数循环均衡器向量，作为DSS序列与DSS回读序列的均衡的比较的函数产生误差信号。 不可接受的误差信号指示需要调整系数循环均衡器向量以产生DSS序列的可接受比较和基于系数循环均衡器向量的DSS回读序列的均衡。
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39.发明授权Synchronous servo channel for longitudinal position detection and position error signal generation in tape drive systems 有权用于纵向位置检测的同步伺服通道和磁带机系统中的位置误差信号产生公开(公告)号：US07245450B1
公开(公告)日：2007-07-17
申请号：US11340030
申请日：2006-01-26
IPC分类号： G11B15/52
CPC分类号： G11B5/584
摘要： A fully synchronous longitudinal position (LPOS) detection system is provided for improving the reliability of servo channels in tape systems. The system is based on the interpolation of the servo channel output signal, which is sampled by an analog-to-digital converter (ADC) at a fixed sampling rate, using a clock at a nominal frequency, so that interpolated signal samples are obtained at a predetermined fixed rate, independent of tape velocity. This predetermined fixed rate is defined in terms of samples per unit of length, as opposed to samples per unit of time, which is the measure of the ADC sampling rate. The resolution with which the servo channel signal is obtained at the interpolator output is thus determined by the step interpolation distance.
摘要翻译： 提供了全同步纵向位置（LPOS）检测系统，用于提高磁带系统中伺服通道的可靠性。 该系统基于使用以标称频率的时钟由固定采样率的模数转换器（ADC）采样的伺服信道输出信号的内插，从而获得内插信号样本 一个预定的固定速率，与磁带速度无关。 这个预定的固定速率是根据单位长度的样本来定义的，而不是每单位时间的样本，这是ADC采样率的量度。 因此，通过步进插补距离来确定在内插器输出处获得伺服信号信号的分辨率。
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公开(公告)号：US20090089645A1
公开(公告)日：2009-04-02
申请号：US12058151
申请日：2008-03-28
IPC分类号： H03M13/00
CPC分类号： G11B20/1833
摘要： Method and apparatus for decoding data in a data storage system. In operation, a detector generates an output bit stream in dependence on a data block received from a storage subsystem of the data storage system. A post processor connected to the detector generates a first error corrected bit stream in dependence on the output bit stream and the data block. An error correction decoder connected to the post processor generates a second error corrected bit stream in dependence on the first error corrected bit stream and also generates a checksum in dependence of the second error corrected bit stream. A feedback path supplies from the error correction decoder to the post processor pinning data indicative of locations of correct bits in the second error corrected bit stream in the event that the checksum is indicative of errors in the second error corrected bit stream and the second error corrected bit stream comprises at least one correct interleave. The post processor regenerates the first error corrected bit stream in dependence on the pinning data received from the error correction decoder.
摘要翻译： 用于在数据存储系统中解码数据的方法和装置。 在操作中，检测器根据从数据存储系统的存储子系统接收的数据块产生输出位流。 连接到检测器的后处理器根据输出比特流和数据块生成第一纠错比特流。 连接到后处理器的纠错解码器根据第一纠错比特流产生第二纠错比特流，并且还根据第二纠错比特流产生校验和。 在校验和指示第二纠错比特流中的错误并且校正的第二错误的情况下，反馈路径从错误校正解码器向后处理器提供钉扎指示第二纠错比特流中的正确比特的位置的数据 位流包括至少一个正确的交错。 后处理器根据从纠错解码器接收到的钉扎数据重新生成第一纠错比特流。
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