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公开(公告)号：US20190258413A1
公开(公告)日：2019-08-22
申请号：US16403306
申请日：2019-05-03
发明人： Roy D. Cideciyan , Simeon Furrer , Ernest S. Gale , Mark A. Lantz
摘要： In one general embodiment, a method includes receiving data logically organized into a predetermined number of two-dimensional arrays, each two-dimensional array including a plurality of NS codewords positioned orthogonally to a plurality of WS codewords. The method also includes successively writing each of the NS codewords to a data storage medium. A first NS codeword from a first two-dimensional array is written to the data storage medium prior to starting to write a second NS codeword from the first two-dimensional array. Also, the plurality of NS codewords are protected with a stronger encoding than the plurality of WS codewords.
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公开(公告)号：US10120599B2
公开(公告)日：2018-11-06
申请号：US15380987
申请日：2016-12-15
发明人： Roy D. Cideciyan , Simeon Furrer , Ernest S. Gale , Mark A. Lantz
摘要： In one embodiment, a method includes reading a plurality of narrow-spread (NS) codewords from M tracks of a magnetic tape medium using a plurality of read elements, the plurality of NS codewords collectively comprising data logically organized as a predetermined number of two-dimensional arrays. Each two-dimensional array includes a predetermined number of NS codewords positioned orthogonally to a predetermined number of wide-spread (WS) codewords, with a first NS codeword from a first two-dimensional array being read in its entirety from the magnetic tape medium prior to reading a second NS codeword from the first two-dimensional array. The method also includes laterally decoding each NS codeword from the first two-dimensional array read from the M tracks of the magnetic tape medium in succession prior to decoding any WS codewords from the first two-dimensional array. The NS codewords are protected with a stronger encoding than the WS codewords within each two-dimensional array.
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公开(公告)号：US09985658B2
公开(公告)日：2018-05-29
申请号：US15583742
申请日：2017-05-01
CPC分类号： H03M13/2909 , G06F11/00 , H03M13/1102 , H03M13/1515 , H03M13/2927 , H03M13/293 , H03M13/2948 , H03M13/2951 , H03M13/2975 , H04L1/0051
摘要： In one embodiment, a method includes receiving data and in an iterative process until decoded data is output or a predetermined number of full iterations have occurred: C1 decoding all first subsets of the data, determining whether to stop decoding the data after the C1 decoding, incrementing a half iteration counter to indicate completion of a half iteration, C2 decoding all second subsets of the data two or more times in each half iteration using two or more C2-decoding methods in response to a determination that a second subset is not decoded successfully using a first C2-decoding method, determining whether to stop decoding the data after the C2 decoding, incrementing the half iteration counter to indicate completion of another half iteration, and outputting the set of decoded data in response to a determination that all subsets of the data are decoded successfully.
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4.发明申请公开(公告)号：US20170346502A1
公开(公告)日：2017-11-30
申请号：US15195971
申请日：2016-06-28
IPC分类号： H03M7/40
CPC分类号： H03M7/40
摘要： Provided are a computer program product, system, and method for generating a code alphabet for use by a deployed program to determine codewords for words. A first code alphabet has a first number of symbols that provide variable length codings of the words. A second code alphabet is generated having a second number of symbols formed by merging the symbols in the first code alphabet, wherein the second code alphabet comprises the code alphabet used by the deployed program.
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公开(公告)号：US20170170849A1
公开(公告)日：2017-06-15
申请号：US15181200
申请日：2016-06-13
CPC分类号： H03M13/2909 , H03M13/1515 , H03M13/29 , H03M13/2927 , H03M13/2948 , H03M13/3738 , H03M13/613
摘要： In one embodiment, a system includes a controller and logic integrated with and/or executable by the controller. The logic is configured to perform iterative decoding on encoded data to obtain decoded data. The logic is also configured to perform post-decoding error diagnostics on a first portion of the decoded data in response to not obtaining a valid product codeword in the first portion after the iterative decoding of the encoded data. Other systems, methods, and computer program products for producing post-decoding error signatures are presented in accordance with more embodiments.
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公开(公告)号：US09633690B2
公开(公告)日：2017-04-25
申请号：US14930636
申请日：2015-11-02
CPC分类号： G11B20/1833 , G11B20/10009 , G11B2020/1843 , G11B2020/185
摘要： In one embodiment, a system for cycle-slip resilient iterative read channel operation includes a processor and logic integrated with and/or executable by the processor. The logic is configured to, in an iterative process until a maximum number of iterations has been reached or a valid codeword is produced, execute cycle-slip detection on signal samples to detect one or more cycle-slip events. Also, the logic is configured to selectively alter a timing estimate driving a phase-locked loop (PLL) during any time interval determined to experience a cycle slip in a first pass as indicated by one or more cycle-slip pointers. Additionally, the logic is configured to generate a set of decisions provided by a detector and generate a set of decisions provided by a decoder. Moreover, the logic is configured to output decoding information relating to the signal samples in response to a decoding algorithm producing a valid codeword.
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公开(公告)号：US09612905B2
公开(公告)日：2017-04-04
申请号：US14984086
申请日：2015-12-30
发明人： Roy D. Cideciyan , Simeon Furrer , Mark A. Lantz , Keisuke Tanaka
CPC分类号： G06F11/1076 , G06F3/0619 , G06F3/064 , G06F3/0682 , H03M13/1102 , H03M13/1515 , H03M13/152 , H03M13/2707 , H03M13/2909
摘要： A block of data is partitioned into a plurality of sub-blocks each including a logical array having rows and columns of data symbols, encoded using a row linear block code and a column linear block code. Each product codeword includes a logical array of code symbols having rows which include respective row codewords and columns which include respective column codewords. The product codewords are encoded by encoding groups of L symbols, using a rate-L/(L+M) linear block code to produce a plurality of (L+M)-symbol codewords which are logically arranged in nQ encoded blocks (where n is an integer greater than zero). Each of the nQ encoded blocks includes an array having rows and columns of code symbols in which each column includes a codeword of the column code.
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公开(公告)号：US20160329914A1
公开(公告)日：2016-11-10
申请号：US14703756
申请日：2015-05-04
CPC分类号： H03M13/2909 , G06F11/1076 , G11B20/1833 , H03M13/1102 , H03M13/1515 , H03M13/152 , H03M13/2707 , H03M13/2918 , H03M13/293 , H03M13/616
摘要： In one embodiment, a method includes reading packets of data from M parallel data tracks of a magnetic tape to obtain a plurality of (D+P)-symbol codewords which are logically arranged in nM encoded blocks, each packet including a row of an encoded block, where each encoded block includes an array having rows and columns of code symbols, wherein symbols of each of the (D+P)-symbol codewords are distributed over corresponding rows of the nM encoded blocks, decoding sub-blocks from rows and columns of a plurality of product codewords from the nM encoded blocks, each product codeword including a logical array of code symbols having the rows which include respective row codewords and the columns which include respective column codewords, where each sub-block includes a logical array having rows and columns of data symbols, combining the sub-blocks to form a block of data, and outputting the block of data.
摘要翻译： 在一个实施例中，一种方法包括从磁带的M个并行数据磁道读取数据包，以获得逻辑上排列成nM个编码块的多个（D + P）符号码字，每个数据包包括编码 块，其中每个编码块包括具有代码符号的行和列的阵列，其中每个（D + P）符号码字符号的符号分布在nM个编码块的相应行上，从行和列解码子块 从nM个编码块的多个产品码字中，每个产品码字包括具有包括各行代码字的行的代码符号的逻辑阵列和包括相应的列码字的列，其中每个子块包括具有行的逻辑阵列 和数据符号列，组合子块以形成数据块，并输出数据块。
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9.发明申请PARTIAL REVERSE CONCATENATION FOR DATA STORAGE DEVICES USING COMPOSITE CODES 审中-公开使用复合代码的数据存储设备的部分反向定义公开(公告)号：US20160043742A1
公开(公告)日：2016-02-11
申请号：US14920715
申请日：2015-10-22
摘要： In one embodiment, a computer program product includes a computer readable storage medium having program instructions embodied therewith. The computer readable storage medium is not a transitory signal per se. The embodied program instructions are readable/executable by a processor to cause the processor to write, by the processor, data to a storage medium of a data storage system using a partial reverse concatenated modulation code. The partial reverse concatenated modulation code includes encoding the data by applying a C2 encoding scheme prior to encoding the data by applying one or more modulation encoding schemes, followed by encoding the data by applying a C1 encoding scheme subsequent to the encoding of the data with the one or more modulation encoding schemes. Other computer program products 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，计算机程序产品包括具有与其一起体现的程序指令的计算机可读存储介质。 计算机可读存储介质本身不是暂时信号。 具体的程序指令由处理器读取/执行，以使处理器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。 部分反向级联调制码包括通过应用一个或多个调制编码方案在对数据进行编码之前应用C2编码方案来对数据进行编码，随后通过在数据编码之后应用C1编码方案对数据进行编码 一个或多个调制编码方案。 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他计算机程序产品。
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10.发明授权公开(公告)号：US08964321B2
公开(公告)日：2015-02-24
申请号：US13907759
申请日：2013-05-31
CPC分类号： G11B20/10046 , G11B20/02 , G11B20/10009 , G11B20/1833 , G11B27/30 , G11B2020/185
摘要： According to one embodiment, a magnetic medium's readback signal samples are processed iteratively to provide dropout mitigation for a read channel by feeding the decoder output decisions back to the read channel front end where they are used to drive the decision-aided digital signal processing functions and control loops. Since data decisions provided by the decoder are typically more reliable than those provided by the detector, a significant performance improvement is obtained. A more reliable operation of the digital front-end signal processing functions in turn allows improvements to the reliability of the decoded data. Usage of Error Correcting Code (ECC) schemes that are soft decodable makes the read channel technique, described according to various embodiments herein, particularly efficient.
摘要翻译： 根据一个实施例，磁性介质的回读信号样本被迭代地处理，以通过将解码器输出判决反馈给读取信道前端来提供读取信道的丢弃缓解，其中它们用于驱动决策辅助的数字信号处理功能，以及 控制回路。 由于由解码器提供的数据决定通常比由检测器提供的决定更可靠，所以获得了显着的性能改进。 数字前端信号处理功能的更可靠的操作又提高了解码数据的可靠性。 使用可解码的纠错码（ECC）方案使得根据本文的各种实施例描述的读通道技术特别有效。
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