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公开(公告)号：US5280489A
公开(公告)日：1994-01-18
申请号：US869570
申请日：1992-04-15
申请人： Lyle J. Fredrickson , Razmik Karabed , James W. Rae , Paul H. Siegel , Hemant K. Thapar , Roger W. Wood
发明人： Lyle J. Fredrickson , Razmik Karabed , James W. Rae , Paul H. Siegel , Hemant K. Thapar , Roger W. Wood
CPC分类号： H03M13/31
摘要： A method and apparatus for detecting spectral null sequences of a spectrally-constrained code on a noisy communications channel. From a Viterbi detector with a trellis structure comprising a plurality of states and edges, predetermined ones of the states and edges in the trellis structure are deleted at preselected times modulo N, such as times .phi. modulo N and/or at intermediate times m modulo N, where m=.phi., thereby to create a time-varying trellis structure for limiting the maximum length of dominant error events. The deleted edges are generally those edges which would have entered or emanated from the deleted states if they were not deleted. The trellis structure may be a so-called systolic structure, in which case the spectral null sequences are preferably DC-free or Nyquist free.
摘要翻译： 一种用于检测噪声通信信道上的频谱约束码的频谱零序列的方法和装置。 从具有包括多个状态和边缘的网格结构的维特比检测器，网格结构中的预定的状态和边缘被预选为时间N，例如时间（phi）模N和/或中间时间m 模N，其中m =（phi），从而产生用于限制主要误差事件的最大长度的时变网格结构。 删除的边通常是那些从删除状态输入或发出的边缘，如果它们没有被删除。 网格结构可以是所谓的收缩结构，在这种情况下，光谱无效序列优选不含DC或奈奎斯特。
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2.发明授权High capacity run-length-limited coding system employing asymmetric and even-spaced codes 失效高容量游程长度限制编码系统采用不对称和偶数间隔码
公开(公告)号：US5535187A
公开(公告)日：1996-07-09
申请号：US167104
申请日：1993-12-15
CPC分类号： G11B20/1426 , G06T9/005
摘要： A system for encoding and decoding binary data in a data transmission system, such as a magnetic or optical data storage channel. The encoding process is implemented as a two-step RLL coding procedure wherein the original user bit data are first encoded as an asymmetric RLL code signal at a reduced clock rate and then translated to a second even-spaced RLL code signal suitable for recording to a data storage medium at a full-speed clock rate. The system also provides for recovering suitable even-spaced RLL codes recorded at a full-speed clock rate, translating the recovered even-spaced RLL code signal to an asymmetric RLL code signal at a reduced clock rate, and then decoding the asymmetric RLL code signal to recover the original user bit data. A preferred embodiment uses a rate 2/5 (2, 16, 2) even-spaced RLL code at a full-speed clock rate and a rate 4/5 (0,7; 1,8) asymmetric RLL code at a half-speed clock rate. The rate 4/5 asymmetric RLL code has a high capacity and the rate 2/5 even-spaced RLL code has a wide detection window. The intercode translation procedure requires only simple time-delay circuitry.
摘要翻译： 用于在诸如磁或光数据存储通道的数据传输系统中对二进制数据进行编码和解码的系统。 编码过程被实现为两步RLL编码过程，其中原始用户比特数据首先以降低的时钟速率编码为非对称RLL码信号，然后被转换为适合于记录到第二偶数RLL码信号 数据存储介质以全速时钟速率。 该系统还提供恢复以全速时钟速率记录的合适的均匀间隔的RLL码，将恢复的均匀间隔的RLL码信号以降低的时钟速率转换为非对称RLL码信号，然后解码非对称RLL码信号 恢复原始用户比特数据。 优选实施例以全速时钟速率和半衰期的速率4/5（0,7; 1,8）非对称RLL码使用速率2/5（2,16,2）均匀间隔的RLL码， 速度时钟速率。 速率4/5非对称RLL码具有高容量，速率2/5偶数间隔的RLL码具有宽的检测窗口。 码间转换过程只需要简单的延时电路。
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3.发明授权Magnetic recording medium having magnetic storage and saturable layers, and apparatus and method using the medium 失效具有磁存储和可饱和层的磁记录介质，以及使用介质的装置和方法
公开(公告)号：US5041922A
公开(公告)日：1991-08-20
申请号：US555811
申请日：1990-07-23
摘要： Magnetic record media are described that have an overlying or underlying magnetically saturable high permeability keeper layer in addition to a high coervicity magnetic layer in which magnetic signals are stored. These media are used in magnetic signal processing devices whose transducers are capable of generating a keeper layer-saturating bias flux. In signal reproduction the bias flux magnetically forms a saturation zone in the nature of virtual gap in the keeper layer that directs signal flux between the media and the transducer.
摘要翻译： 描述了磁记录介质，除了存储有磁信号的高强度磁性层之外，还具有覆盖或潜在的可磁饱和的高磁导率保持层。 这些介质用于磁信号处理装置，其传感器能够产生保持层饱和偏压通量。 在信号再现中，偏置通量在保持层中的虚拟间隙的性质中磁性地形成饱和区，其指导介质和换能器之间的信号通量。
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4.发明授权Method and apparatus for determining byte synchronization within a serial data receiver 失效用于确定串行数据接收器内的字节同步的方法和装置
公开(公告)号：US5448571A
公开(公告)日：1995-09-05
申请号：US233168
申请日：1994-04-26
申请人： Ju-Hi J. Hong , Roger W. Wood
发明人： Ju-Hi J. Hong , Roger W. Wood
IPC分类号： H04L7/04 , H04L25/497 , H04J3/06
CPC分类号： H04L7/042 , H04L25/497 , H04L7/046
摘要： A synchronization pattern is provided within an incoming waveform which represents a serial data stream transmitted at a rate determined by a data clock. The synchronization pattern includes a periodic training portion and a sync word portion. The periodic training portion is periodic and has a preselected period. As the periodic training portion is received, a receiver clock phase-locks to the periodic training portion of the incoming waveform, and a sampling circuit periodically samples the incoming waveform relative to the phase and frequency of the receiver clock to produce sample words. Thereafter, a subset of the sample words are selected utilizing a selection pattern having a period equal to the period of the periodic training portion of the incoming waveform. Utilizing the selected subset of sample words, a sync indicator word is produced and compared to preselected criteria. Such a sync indicator word may be produced with reference to the sign of each sample word of the subset of sample words. Finally, in response to a correlation between the sync indicator word and the preselected criteria, byte synchronization between the incoming waveform and the data detector is indicated, wherein the byte synchronization independently from the output of a data detector.
摘要翻译： 在输入波形内提供同步模式，其表示以由数据时钟确定的速率发送的串行数据流。 同步模式包括周期性训练部分和同步字部分。 周期训练部分是周期性的并且具有预选的周期。 当接收到周期性训练部分时，接收器时钟相位锁定到输入波形的周期性训练部分，并且采样电路相对于接收器时钟的相位和频率周期性地采样输入波形以产生采样字。 此后，使用具有等于输入波形的周期性训练部分的周期的周期的选择模式来选择采样字的子集。 利用所选择的采样字的子集，产生同步指示符字并与预先选择的标准进行比较。 可以参考样本字的子集的每个样本字的符号来产生这样的同步指示符字。 最后，响应于同步指示符字与预选标准之间的相关性，指示输入波形和数据检测器之间的字节同步，其中字节同步独立于数据检测器的输出。
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5.发明授权Parity and syndrome generation for error detection and correction in digital communication systems 失效数字通信系统中用于错误检测和校正的奇偶校验和校正生成
公开(公告)号：US4555784A
公开(公告)日：1985-11-26
申请号：US586526
申请日：1984-03-05
申请人： Roger W. Wood
发明人： Roger W. Wood
CPC分类号： H03M13/15
摘要： A parity and/or syndrome generator generates a block parity check for the detection and/or correction of errors in a multi-channel digital data communication system using a linear code or a coset of such code in which data and parity bytes are intended to be digitally encoded in n by m bit data blocks to form a respective codeword in n parallel bytes of m bits in serial order of significance in the form of a codeword having n elements represented by respective bytes in the Galois field GF(2.sup.m), such Galois field being defined by an m-order field generator polynomial in integral powers of z between z.sup.0 and z.sup.m, where z is the inverse of the delay operator z.sup.-1 of such Galois field. A first circuit produces a first partial parity check for the bit of such significance in each of the n elements of the respective codeword. A second circuit sums in the Galois field over all elements of the codeword the first partial parity checks to form a second partial parity check. A third circuit multiplies the bit content of each of a plurality of m-bit registers by the inverse of the delay operator in the Galois field and produces respective m-bit products and sums the products with the second partial parity checks to form a third parity check. Clock pulses synchronously clock the data block bits in the order of significance byte-parallel into the first circuit, clock the third parity check into the m-bit registers, and clear the m-bit registers after m bits.
摘要翻译： 奇偶校验和/或校正子发生器使用这样的代码的线性代码或陪集来生成用于多通道数字数据通信系统中的错误的检测和/或校正的块奇偶校验，其中数据和奇偶校验字节将被设计为 以m位数据块进行数字编码，以形成具有由伽罗瓦域GF（2m）中的各个字节表示的n个元素的码字形式的有意义的串行顺序的m位的n个并行字节中的相应码字，这样的Galois 场由z-zm之间的z的积分幂的m阶场生成多项式定义，其中z是这种伽罗瓦域的延迟算子z-1的倒数。 第一电路在相应码字的n个元素的每一个中产生这种重要性的位的第一部分奇偶校验。 第二电路在Galois字段中对码字的所有元素进行加法，第一部分奇偶校验检查以形成第二部分奇偶校验。 第三电路将多个m位寄存器中的每一个的位内容乘以伽罗瓦域中的延迟算子的倒数，并产生相应的m位乘积，并将乘积与第二部分奇偶校验相加以形成第三奇偶校验 检查。 时钟脉冲将数据块位以字节并行的顺序同步到第一个电路中，将第三个奇偶校验定时到m位寄存器，并在m位后清除m位寄存器。
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公开(公告)号：US08792210B2
公开(公告)日：2014-07-29
申请号：US13612704
申请日：2012-09-12
CPC分类号： G11B5/3116 , G11B5/1278 , G11B5/1871 , G11B5/23 , G11B5/3146 , G11B5/315
摘要： In one embodiment, a system includes a writer for shingled recording which includes a write pole having a trailing edge and first and second side edges extending from the trailing edge. The writer further includes a shield extending along and about parallel to at least an entire length of the trailing edge, the shield also extending along at least a portion of the first side edge. Other systems are also presented which include advanced shingled writing head designs.
摘要翻译： 在一个实施例中，一种系统包括用于瓦楞记录的写入器，其包括具有后缘的写入极和从后沿延伸的第一和第二侧边缘。 写入器还包括沿着后边缘至少整个长度平行延伸并且围绕其平行的屏蔽件，屏蔽件还沿着第一侧边缘的至少一部分延伸。 还提出了其他系统，其中包括先进的带灰色书写头设计。
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7.发明授权Method and apparatus for precompensation value determination in a PRML data channel 失效PRML数据通道中预补偿值确定的方法和装置
公开(公告)号：US5357520A
公开(公告)日：1994-10-18
申请号：US830032
申请日：1992-01-31
CPC分类号： G11B20/10194 , G11B20/10055 , G11B20/182
摘要： A method and apparatus are provided for determining an adjustable precompensation value in a partial-response maximum-likelihood (PRML) data channel. The PRML data channel includes an adjustable precompensation function for modulating the write data waveform. A predetermined test pattern is written using write circuitry in the disk file. The predetermined test pattern is insensitive to channel misequalization and provides a reference for gain and timing control. The written predetermined test pattern is read back using read circuitry in the disk file. An error in sample values in the read back predetermined test pattern is identified using logic provided in the PRML data channel while performing a standard read operation of a data sector written with the test pattern. The adjustable write precompensation value is adjusted responsive to identifying an error.
摘要翻译： 提供了一种用于确定部分响应最大似然（PRML）数据信道中的可调节预补偿值的方法和装置。 PRML数据通道包括用于调制写数据波形的可调预补偿功能。 使用磁盘文件中的写入电路写入预定的测试模式。 预定的测试模式对信道估计不敏感，并为增益和定时控制提供参考。 使用磁盘文件中的读取电路读取写入的预定测试模式。 使用在PRML数据通道中提供的逻辑，在执行用测试图案写入的数据扇区的标准读取操作的同时，使用读取的预定测试图案中的采样值的错误来识别。 响应于识别错误来调整可调写入预补偿值。
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公开(公告)号：US20130016443A1
公开(公告)日：2013-01-17
申请号：US13612704
申请日：2012-09-12
IPC分类号： G11B5/11
CPC分类号： G11B5/3116 , G11B5/1278 , G11B5/1871 , G11B5/23 , G11B5/3146 , G11B5/315
摘要： In one embodiment, a system includes a writer for shingled recording which includes a write pole having a trailing edge and first and second side edges extending from the trailing edge. The writer further includes a shield extending along and about parallel to at least an entire length of the trailing edge, the shield also extending along at least a portion of the first side edge. Other systems are also presented which include advanced shingled writing head designs.
摘要翻译： 在一个实施例中，一种系统包括用于瓦楞记录的写入器，其包括具有后缘的写入极和从后沿延伸的第一和第二侧边缘。 写入器还包括沿着后边缘至少整个长度平行延伸并且围绕其平行的屏蔽件，屏蔽件还沿着第一侧边缘的至少一部分延伸。 还提出了其他系统，其中包括先进的带灰色书写头设计。
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公开(公告)号：US08310786B2
公开(公告)日：2012-11-13
申请号：US12556472
申请日：2009-09-09
CPC分类号： G11B5/3116 , G11B5/1278 , G11B5/1871 , G11B5/23 , G11B5/3146 , G11B5/315
摘要： In one embodiment, a system includes a writer for shingled recording which includes a write pole having a trailing edge and first and second side edges extending from the trailing edge. The writer further includes a shield extending along and about parallel to only a portion of the trailing edge or only a portion of the first side edge, and the shield does not extend along the second side edge. In addition, an angle formed between the first side edge and the trailing edge along an air bearing surface side of the writer is different than an angle formed between the second side edge and the trailing edge along the air bearing surface side of the writer. Other systems are also presented which include advanced shingled writing head designs.
摘要翻译： 在一个实施例中，一种系统包括用于瓦楞记录的写入器，其包括具有后缘的写入极和从后沿延伸的第一和第二侧边缘。 写入器还包括屏蔽件，其沿着并且大约平行于后缘的一部分延伸，或仅仅是第一侧边缘的一部分，并且屏蔽件不沿着第二侧边缘延伸。 此外，沿着写入器的空气支承面侧的第一侧边缘和后缘之间形成的角度不同于沿着书写器的空气轴承面侧的第二侧边缘和后边缘之间形成的角度。 还提出了其他系统，其中包括先进的带灰色书写头设计。
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公开(公告)号：US20110058277A1
公开(公告)日：2011-03-10
申请号：US12556472
申请日：2009-09-09
CPC分类号： G11B5/3116 , G11B5/1278 , G11B5/1871 , G11B5/23 , G11B5/3146 , G11B5/315
摘要： In one embodiment, a system includes a writer for shingled recording which includes a write pole having a trailing edge and first and second side edges extending from the trailing edge. The writer further includes a shield extending along and about parallel to only a portion of the trailing edge or only a portion of the first side edge, and the shield does not extend along the second side edge. In addition, an angle formed between the first side edge and the trailing edge along an air bearing surface side of the writer is different than an angle formed between the second side edge and the trailing edge along the air bearing surface side of the writer. Other systems are also presented which include advanced shingled writing head designs.
摘要翻译： 在一个实施例中，一种系统包括用于瓦楞记录的写入器，其包括具有后缘的写入极和从后沿延伸的第一和第二侧边缘。 写入器还包括屏蔽件，其沿着并且大约平行于后缘的一部分延伸，或仅仅是第一侧边缘的一部分，并且屏蔽件不沿着第二侧边缘延伸。 此外，沿着写入器的空气支承面侧的第一侧边缘和后缘之间形成的角度不同于沿着书写器的空气轴承面侧的第二侧边缘和后边缘之间形成的角度。 还提出了其他系统，其中包括先进的带灰色书写头设计。
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