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51.发明申请DATA FORMAT USING AN EFFICIENT REVERSE CONCATENATED MODULATION CODE FOR MAGNETIC TAPE RECORDING 有权使用有效的反向调整码进行磁带记录的数据格式公开(公告)号：US20130326305A1
公开(公告)日：2013-12-05
申请号：US13483004
申请日：2012-05-29
IPC分类号： H03M13/00
CPC分类号： G11B5/00813 , G11B20/1833 , G11B2020/1836 , G11B2020/185 , G11B2020/1853 , G11B2220/90 , H03M5/145 , H03M13/1102 , H03M13/13 , H03M13/1515 , H03M13/2906
摘要： In one embodiment, a tape drive system includes a write channel for writing data to a magnetic tape, the write channel utilizing a rate-(232/234) reverse concatenated modulation code. The write channel includes logic adapted for receiving a data stream comprising one or more data sets, logic adapted for separating each data set into a plurality of sub data sets, logic adapted for encoding each sub data set with a C2 encoding, logic adapted for encoding each C2-encoded sub data set with a modulation code, logic adapted for encoding each modulated sub data set with a C1 encoding, and logic adapted for simultaneously writing the encoded modulated sub data sets to data tracks of the magnetic tape. Other systems for writing data to a magnetic tape utilizing a rate-(232/234) reverse concatenated modulation code are described according to various other embodiments.
摘要翻译： 在一个实施例中，磁带驱动器系统包括用于将数据写入磁带的写入通道，该写入通道利用速率（232/234）反向级联调制码。 写通道包括适于接收包括一个或多个数据组的数据流的逻辑，适用于将每个数据集分成多个子数据集的逻辑，适用于使用C2编码对每个子数据集进行编码的逻辑，适用于编码的逻辑 具有调制码的每个C2编码的子数据集，适用于用C1编码对每个经调制的子数据集进行编码的逻辑，以及用于将编码的已调制子数据集同时写入到磁带的数据轨道的逻辑。 根据各种其他实施例，描述使用速率（232/234）反向级联调制码将数据写入磁带的其它系统。
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52.发明授权Robust metric computation of longitudinal position (LPOS) data symbol detection 有权纵向位置（LPOS）数据符号检测的鲁棒度量计算公开(公告)号：US08576510B2
公开(公告)日：2013-11-05
申请号：US13267837
申请日：2011-10-06
IPC分类号： G11B5/584
CPC分类号： G11B20/1202 , G11B5/584 , G11B20/10231 , G11B20/10287 , G11B20/1201 , G11B2020/1281 , G11B2220/90 , G11B2220/93 , G11B2220/956
摘要： In one embodiment, a tape drive system includes a magnetic head having a servo sensor for sensing a defined servo track of a magnetic tape and configured to read servo pulses from servo bursts of the servo track while the magnetic tape is moving past the magnetic head with the servo bursts representing an encoded data symbol, an analog-to-digital converter configured to provide a sequence of samples of the readback servo signal, a digital correlator configured to compute a correlation signal between the sequence and a reference waveform, a timing reference module configured to provide a reference timing model having interpolation instants to the digital correlator, a correlation interpolator configured to interpolate the correlation signal at the interpolation instants and compute a longitudinal position (LPOS) detection metric, and an LPOS detector configured to decode the encoded data symbol of the servo bursts using the computed LPOS detection metric.
摘要翻译： 在一个实施例中，磁带驱动系统包括具有伺服传感器的磁头，该伺服传感器用于感测磁带的定义的伺服磁道并且被配置为在磁带通过磁头移动经过磁头的同时从伺服磁道的伺服脉冲串读取伺服脉冲， 表示编码数据符号的伺服突发，被配置为提供所述回读伺服信号的采样序列的模数转换器，被配置为计算所述序列与参考波形之间的相关信号的数字相关器，定时参考模块 被配置为向所述数字相关器提供具有内插时刻的参考定时模型，相关内插器，被配置为在所述内插时刻内插所述相关信号并计算纵向位置（LPOS）检测度量，以及LPOS检测器，被配置为对所述编码数据符号 的伺服脉冲串使用计算的LPOS检测度量。
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53.发明申请公开(公告)号：US20130128374A1
公开(公告)日：2013-05-23
申请号：US13304227
申请日：2011-11-23
CPC分类号： G11B20/10046 , G11B20/10509 , G11B2220/90 , H03H21/0012 , H03H2021/0072
摘要： A method for selecting which tap coefficients of a programmable finite-impulse-response (FIR) equalizer to fix is disclosed. In one embodiment, such a method includes performing an initial calibration to determine an initial value for each tap coefficient of a FIR equalizer. These initial values may be used to produce a first waveform. The method then performs an operation on the first waveform to produce a second waveform comprising multiple lobes. The second waveform is then analyzed to determine one or more lobes of the second waveform that have the largest area. The method then fixes coefficients of one or more taps that are closest to the lobe or lobes having the largest area. A corresponding apparatus and computer program product are also disclosed.
摘要翻译： 公开了一种用于选择可修复有限脉冲响应（FIR）均衡器的抽头系数以进行固定的方法。 在一个实施例中，这种方法包括执行初始校准以确定FIR均衡器的每个抽头系数的初始值。 这些初始值可用于产生第一波形。 该方法然后对第一波形执行操作以产生包括多个波瓣的第二波形。 然后分析第二波形以确定具有最大面积的第二波形的一个或多个波瓣。 该方法然后固定最靠近具有最大面积的凸角或凸角的一个或多个抽头的系数。 还公开了相应的装置和计算机程序产品。
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54.发明申请公开(公告)号：US20120144228A1
公开(公告)日：2012-06-07
申请号：US13315536
申请日：2011-12-09
IPC分类号： G06F11/08
CPC分类号： G11B20/10009 , G11B20/10027 , G11B20/10046 , G11B20/10074 , G11B20/10175 , G11B20/10222 , G11B20/10425 , G11B20/10481 , G11B2020/10675 , G11B2020/10759 , G11B2220/2537 , G11B2220/41 , G11B2220/90
摘要： A method to read information from an information storage medium using a read channel, where that read channel includes a data cache, where the method generates an analog waveform comprising the information, provides that analog waveform to a read channel generates a digital signal from that analog waveform using one or more first operating parameters, corrects that digital signal at an actual error correction rate, determines if the actual error correction rate is greater than an error correction rate threshold. If the actual error correction rate exceeds the error correction rate threshold, then the method captures the digital signal, stores that captured data in a data cache, reads that digital signal from the cache, generates one or more second operating parameters, provides those one or more second operating parameters to the read channel.
摘要翻译： 一种使用读取通道从信息存储介质读取信息的方法，其中该读取通道包括数据高速缓存，其中该方法生成包括该信息的模拟波形，该模拟波形提供给读取通道的模拟波形从该模拟信号产生数字信号 波形，使用一个或多个第一操作参数，以实际的纠错率对数字信号进行校正，确定实际的纠错率是否大于纠错率阈值。 如果实际的纠错率超过纠错率阈值，则该方法捕获数字信号，将捕捉到的数据存储在数据高速缓存中，从高速缓存读取该数字信号，产生一个或多个第二操作参数， 更多的第二个操作参数到读通道。
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55.发明授权公开(公告)号：US08095712B2
公开(公告)日：2012-01-10
申请号：US12862650
申请日：2010-08-24
IPC分类号： G06F13/28
CPC分类号： G11B20/10009 , G11B20/10027 , G11B20/10046 , G11B20/10074 , G11B20/10175 , G11B20/10222 , G11B20/10425 , G11B20/10481 , G11B2020/10675 , G11B2020/10759 , G11B2220/2537 , G11B2220/41 , G11B2220/90
摘要： A method and apparatus to read information from an information storage medium using a read channel, where that read channel includes a data cache. The invention generates an analog waveform comprising the information, and provides that analog waveform to a read channel, and generates a digital signal from that analog waveform using one or more first operating parameters. The method error corrects that digital signal at an actual error correction rate, and determines if the actual error correction rate is greater than an error correction rate threshold. If the actual error correction rate exceeds the error correction rate threshold, then the method captures the digital signal, stores that captured data in a data cache, reads that digital signal from the cache, generates one or more second operating parameters, and provides those one or more second operating parameters to the read channel. Thereafter, the method uses those one or more second operating parameters to read the information from the information storage medium.
摘要翻译： 一种使用读通道从信息存储介质读取信息的方法和装置，其中该读通道包括数据高速缓存。 本发明产生包含该信息的模拟波形，并将该模拟波形提供给读通道，并使用一个或多个第一操作参数从该模拟波形生成数字信号。 方法误差以实际的纠错率校正数字信号，并确定实际的纠错率是否大于纠错率阈值。 如果实际的纠错率超过纠错率阈值，则该方法捕获数字信号，将捕获的数据存储在数据高速缓存中，从高速缓存中读取该数字信号，产生一个或多个第二操作参数，并提供那些 或更多的第二操作参数。 此后，该方法使用这些一个或多个第二操作参数来从信息存储介质读取信息。
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56.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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公开(公告)号：US07877662B2
公开(公告)日：2011-01-25
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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公开(公告)号：US07873894B2
公开(公告)日：2011-01-18
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：US20100226037A1
公开(公告)日：2010-09-09
申请号：US12400369
申请日：2009-03-09
申请人： Nhan Bui , Giovanni Cherubini , Roy D. Cideciyan , Robert A. Hutchins , Jens Jelitto , Kazuhiro Tsuruta
发明人： Nhan Bui , Giovanni Cherubini , Roy D. Cideciyan , Robert A. Hutchins , Jens Jelitto , Kazuhiro Tsuruta
CPC分类号： G11B5/584
摘要： A weighted combining scheme exploits information from two servo channels operating in parallel. A timing-based servo module servo module comprises two servo channels coupled respectively to receive two digital servo signals read from a data tape. Both channels have outputs for an unweighted metric and for a measure of the channel reliability. A weight computation module provides first and second weight signals using the measures of channel reliability from the servo channels. A first multiplying node receives a first unweighted metric and a first weight signal and is operable to output a first weighted metric. A second multiplying node receives a second unweighted metric and a second weight signal and outputs a second weighted metric. A summing node receives the first and second weighted metrics and outputs a combined weighted metric to an LPOS word decoder.
摘要翻译： 加权组合方案利用来自并行操作的两个伺服通道的信息。 基于定时的伺服模块伺服模块包括分别耦合的两个伺服通道，以接收从数据磁带读取的两个数字伺服信号。 两个通道都具有未加权度量的输出和通道可靠性的度量。 权重计算模块使用来自伺服信道的信道可靠性的测量来提供第一和第二加权信号。 第一乘法节点接收第一未加权度量和第一加权信号，并且可操作以输出第一加权度量。 第二乘法节点接收第二未加权度量和第二加权信号并输出第二加权度量。 求和节点接收第一和第二加权度量，并将组合加权度量输出到LPOS字解码器。
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60.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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