-
公开(公告)号：US20070076313A1
公开(公告)日：2007-04-05
申请号：US11242343
申请日：2005-10-03
IPC分类号： G11B5/09
CPC分类号： G11B5/09 , G11B2005/0013
摘要： Provided is a dynamic method for asymmetry compensation in a storage read channel. An asymmetry cancellation component in communication with an analog-to-digital converter receives an analog signal representing data read from a storage medium by a read head. The asymmetry cancellation component receives a digital signal from the analog-to-digital converter representing data read from the storage medium and computes an error signal indicating an asymmetry in the digital signal. The computed error signal is used to determine a coefficient. The digital signal is adjusted using the coefficient to produce a corrected digital signal.
摘要翻译： 提供了一种用于存储读取通道中的不对称补偿的动态方法。 与模数转换器通信的不对称消除部件接收表示由读取头从存储介质读取的数据的模拟信号。 不对称消除部件从模数转换器接收表示从存储介质读取的数据的数字信号，并计算指示数字信号不对称的误差信号。 计算出的误差信号用于确定系数。 使用系数调整数字信号以产生校正的数字信号。
-
72.发明申请Magnetic tape read channel signal values developed employing intermediate bits of the path memory of a PRML viterbi detector 失效使用PRML维特比检测器的路径存储器的中间位开发的磁带读取通道信号值公开(公告)号：US20060119964A1
公开(公告)日：2006-06-08
申请号：US11003316
申请日：2004-12-03
CPC分类号： G11B20/10009 , G11B20/10037 , G11B20/10055 , G11B20/10074 , G11B20/10296 , G11B2220/90
摘要： Magnetic tape read channel signal values are developed employing intermediate bits of the path memory of a PRML Viterbi detector. Identification logic identifies a most likely path memory state of the PRML Viterbi detector from the path metrics of the PRML Viterbi detector. An intermediate bit sequence of the identified most likely path memory state is obtained, the intermediate bit sequence extending from an initiation point of the path memory which is intermediate the output and the input of the PRML Viterbi detector. A sample value is determined which corresponds to the obtained intermediate bit sequence.
摘要翻译： 使用PRML维特比检测器的路径存储器的中间位来开发磁带读取通道信号值。 识别逻辑根据PRML维特比检测器的路径度量来识别PRML维特比检测器的最可能的路径存储状态。 获得所识别的最可能的路径存储器状态的中间比特序列，从位于PRML维特比检测器的输出和输入之间的路径存储器的起始点延伸的中间比特序列。 确定对应于获得的中间位序列的采样值。
-
公开(公告)号：US08743499B2
公开(公告)日：2014-06-03
申请号：US13527490
申请日：2012-06-19
CPC分类号： G11B5/00817 , G11B5/09 , G11B20/10046 , G11B20/10074 , G11B20/10287 , G11B2220/90
摘要： In one embodiment, a system includes a tape channel for reading data from a magnetic tape medium to produce a signal, a bank of noise whitening filters positioned subsequent to the tape channel adapted for receiving the signal, the bank of noise whitening filters being adapted for minimizing variance of noise affecting the signal at an output of the bank of noise whitening filters, wherein each noise whitening filter in the bank of noise whitening filters is dependent on a different possible data pattern, a soft DMAX detector adapted for calculating first soft information, dependent on the different possible data patterns, about each bit of the signal from the bank of noise whitening filters, and sending the first soft information to a soft decoder adapted for calculating second soft information about each bit of the signal and sending the second soft information to the soft DMAX detector.
摘要翻译： 在一个实施例中，系统包括用于从磁带介质读取数据以产生信号的带通道，位于适于接收信号的磁带通道之后的一组噪声白化滤波器，噪声增白滤波器组适于 最小化影响噪声白化滤波器组的输出处的信号的噪声的方差，其中噪声白化滤波器组中的每个噪声白化滤波器取决于不同的可能数据模式，适于计算第一软信息的软DMAX检测器， 取决于不同的可能数据模式，关于噪声白化滤波器组的信号的每个位，并且将第一软信息发送到软解码器，该软解码器适于计算关于信号的每个位的第二软信息，并且发送第二软信息 到软DMAX检测器。
-
74.发明申请METHODS FOR PARTIAL REVERSE CONCATENATION FOR DATA STORAGE DEVICES USING COMPOSITE CODES 有权使用复合代码进行数据存储设备部分反向定位的方法公开(公告)号：US20130326307A1
公开(公告)日：2013-12-05
申请号：US13483026
申请日：2012-05-29
CPC分类号： H03M13/2906 , G06F11/1076 , G11B20/1426 , G11B2020/1836 , G11B2020/1853 , G11B2220/956 , H03M13/09 , H03M13/1102 , H03M13/1515 , H03M13/253 , H03M13/29 , H03M13/2909 , H03M13/2945 , H03M13/2957
摘要： In one embodiment, a method includes writing data to a storage medium of a data storage system using a partial reverse concatenated modulation code by encoding data sets using a C2 encoding scheme, adding a header to each subunit of the data sets, encoding the headers of the data sets with a first modulation encoding scheme, encoding data portions of the data sets with a second modulation encoding scheme, encoding portions of the one or more C2-encoded data sets using a C1 encoding scheme, combining the C1-encoded portions with the modulation-encoded headers of the C2-encoded data sets using a multiplexer, and writing the one or more combined C1- and C2-encoded data sets to data tracks of the storage medium. Other methods for writing data to a storage medium of a data storage system using a partial reverse concatenated modulation code are presented according to more embodiments.
摘要翻译： 在一个实施例中，一种方法包括使用部分反向级联调制码将数据写入数据存储系统的存储介质，通过使用C2编码方案对数据集进行编码，将头部添加到数据集的每个子单元， 具有第一调制编码方案的数据集，用第二调制编码方案对数据集的数据部分进行编码，使用C1编码方案对所述一个或多个C2编码数据集的部分进行编码，将C1编码部分与 使用多路复用器对C2编码数据集的调制编码报头，以及将一个或多个组合的C1和C2编码的数据集写入存储介质的数据轨道。 根据更多实施例，呈现用于使用部分反向级联调制码将数据写入数据存储系统的存储介质的其它方法。
-
公开(公告)号：US20070206310A1
公开(公告)日：2007-09-06
申请号：US11733934
申请日：2007-04-11
IPC分类号： G11B5/035
摘要： A read channel equalizer of a magnetic tape drive which equalized 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： 驱动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的磁信号。 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。
-
76.发明授权
公开(公告)号：US5060088A
公开(公告)日：1991-10-22
申请号：US372722
申请日：1989-06-28
IPC分类号： G11B5/035 , G11B20/10 , G11B20/18 , H03H15/00 , H03H17/00 , H03H21/00 , H04B3/04 , H04L25/03 , H04L27/01 , G11B5/09
CPC分类号： H03H21/0012 , G11B20/10009 , G11B5/035
摘要： The channel characteristics of magnetic-disk storage devices vary with track radius. An adaptive three-tap transversal equalizer that compensates these variations for systems using partial-response signaling is presented. The equalizer coefficients are updated by applying a procedure that is related to the recursive least-squares algorithm. This new updating procedure does not require multiplications and is well suited for high-speed implementation. Results obtained by computer simulations and measurements with a prototype have shown that the proposed adaptive equalizer can effectively compensate variations in magnetic-disk channel characteristics with track radius.
-
公开(公告)号：US08854759B2
公开(公告)日：2014-10-07
申请号：US13454935
申请日：2012-04-24
IPC分类号： G11B5/09
CPC分类号： G11B20/1833 , G11B5/00813 , G11B20/10379 , G11B2020/185 , H03M5/145 , H03M13/1111 , H03M13/13 , H03M13/2957 , H03M13/3905 , H03M13/3972 , H03M13/6325
摘要： In one embodiment, a tape drive system includes a soft detector for executing a first forward loop of a detection algorithm on a first block of signal samples during a first time interval; and logic for executing forward and reverse loops during several time intervals; and logic adapted for outputting a first decoded block of signal samples based on the executing the decoding algorithm on the first block during a sixth time interval, wherein a sum of second, third, fourth, fifth, and sixth time intervals are about equal in duration to the first time interval.
摘要翻译： 在一个实施例中，磁带驱动系统包括软检测器，用于在第一时间间隔期间在第一信号样本块上执行检测算法的第一正向循环; 以及用于在几个时间间隔期间执行正向和反向循环的逻辑; 以及适于在第六时间间隔期间基于在第一块上执行解码算法来输出信号样本的第一解码块的逻辑，其中第二，第三，第四，第五和第六时间间隔的和大约相等于持续时间 到第一次间隔。
-
公开(公告)号：US08797670B2
公开(公告)日：2014-08-05
申请号：US13527508
申请日：2012-06-19
CPC分类号： G11B20/10046 , G11B5/008 , G11B20/10074 , G11B20/10287 , G11B2020/185 , G11B2020/1853 , G11B2220/90
摘要： In accordance with one embodiment, a data storage system includes a tape channel for reading precoded data from a magnetic tape medium to produce a signal, a soft detector adapted for calculating first soft information about each bit of the signal and sending the first soft information to a soft decoder, and the soft decoder positioned subsequent to the soft detector, the soft decoder being adapted for calculating second soft information about each bit of the signal and sending the second soft information to the soft detector, wherein the precoded data includes a characteristic of being passed through at least one precoder prior to being written to the magnetic tape medium, and wherein the soft detector provides automatic compensation for the precoded data. Other systems, methods, and computer program products for reading data using an adaptive soft-output detector are described according to more embodiments.
摘要翻译： 根据一个实施例，数据存储系统包括用于从磁带介质读取预编码数据以产生信号的磁带通道，软检测器，适于计算关于信号的每个位的第一软信息，并将第一软信息发送到 软解码器和位于软检测器之后的软解码器，软解码器适于计算关于信号的每个位的第二软信息，并将第二软信息发送给软检测器，其中预编码数据包括 在写入磁带介质之前通过至少一个预编码器，并且其中软检测器为预编码数据提供自动补偿。 根据更多实施例描述了使用自适应软输出检测器读取数据的其它系统，方法和计算机程序产品。
-
公开(公告)号：US08743498B2
公开(公告)日：2014-06-03
申请号：US13527473
申请日：2012-06-19
CPC分类号： G11B20/10046 , G11B5/008 , G11B20/10268
摘要： In one embodiment, a data storage system includes a tape channel for reading data from a magnetic tape medium to produce a signal, a noise whitening filter positioned subsequent to the tape channel adapted for receiving the signal, wherein the noise whitening filter is adapted for minimizing variance of its output signal, a soft detector adapted for receiving output from the noise whitening filter, the soft detector adapted for calculating first soft information about each bit of the signal and sending the first soft information to a soft decoder, and the soft decoder positioned subsequent to the soft detector, the soft decoder being adapted for calculating second soft information about each bit of the signal and sending the second soft information to the soft detector. Other systems, methods, and computer program products are described according to more embodiments.
摘要翻译： 在一个实施例中，数据存储系统包括用于从磁带介质读取数据以产生信号的磁带通道，位于适于接收信号的磁带通道之后的噪声白化滤波器，其中噪声增白滤波器适于最小化 其输出信号的方差，适于接收来自噪声白化滤波器的输出的软检测器，软检测器适于计算关于信号的每个位的第一软信息，并将第一软信息发送到软解码器，并且软解码器定位 在软检测器之后，软解码器适于计算关于信号的每个位的第二软信息，并将第二软信息发送到软检测器。 根据更多实施例描述其它系统，方法和计算机程序产品。
-
80.发明申请公开(公告)号：US20130279040A1
公开(公告)日：2013-10-24
申请号：US13454935
申请日：2012-04-24
CPC分类号： G11B20/1833 , G11B5/00813 , G11B20/10379 , G11B2020/185 , H03M5/145 , H03M13/1111 , H03M13/13 , H03M13/2957 , H03M13/3905 , H03M13/3972 , H03M13/6325
摘要： In one embodiment, a tape drive system includes a soft detector for executing a first forward loop of a detection algorithm on a first block of signal samples during a first time interval; and logic for executing forward and reverse loops during several time intervals; and logic adapted for outputting a first decoded block of signal samples based on the executing the decoding algorithm on the first block during a sixth time interval, wherein a sum of second, third, fourth, fifth, and sixth time intervals are about equal in duration to the first time interval.
摘要翻译： 在一个实施例中，磁带驱动系统包括软检测器，用于在第一时间间隔期间在第一信号样本块上执行检测算法的第一正向循环; 以及用于在几个时间间隔期间执行正向和反向循环的逻辑; 以及适于在第六时间间隔期间基于在第一块上执行解码算法来输出信号样本的第一解码块的逻辑，其中第二，第三，第四，第五和第六时间间隔的和大约相等于持续时间 到第一次间隔。
-
-
-
-
-
-
-
-
-
搜索结果
103 条记录 (耗时 0.042 秒)
