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1.发明授权Method and apparatus for performing digital detection of data stored on an optical medium 失效用于对存储在光学介质上的数据执行数字检测的方法和装置公开(公告)号：US06278747B1
公开(公告)日：2001-08-21
申请号：US09039124
申请日：1998-03-13
IPC分类号： H03D100
CPC分类号： H04L25/069 , G11B20/10046 , H04L25/062 , H04L25/4902
摘要： A method and apparatus for detecting data written on a recording medium are disclosed. The recording medium, such as an optical or magnetic medium, is initially sensed by a transducer to produce an analog data signal waveform. The analog data signal waveform is then digitized by an analog-to-digital convertor to produce a set of digitized data samples. The set of digitized data samples may be equalized to reduce noise. Subsequently, a mid-point sample is inserted between each two samples within the set of equalized data samples utilizing a mid-point interpolation algorithm. With the additional points provided by mid-point interpolation, the absence or presence of a detection event, such as a peak or a transition, between every two samples within the set of equalized data samples are determined.
摘要翻译： 公开了一种用于检测写在记录介质上的数据的方法和装置。 最初由换能器感测记录介质，例如光学或磁介质，以产生模拟数据信号波形。 然后模拟数据信号波形由模数转换器数字化，以产生一组数字化数据采样。 数字化数据样本集可以被均衡以减少噪声。 随后，使用中点插值算法，在均衡数据样本集合内的每个两个样本之间插入中点样本。 通过中点插值提供的附加点，确定在该均衡数据样本集合内的每两个采样之间不存在或存在检测事件，例如峰值或转变。
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2.发明授权
公开(公告)号：US6118745A
公开(公告)日：2000-09-12
申请号：US13058
申请日：1998-01-26
CPC分类号： G11B20/1403 , G11B20/10009 , G11B7/0037 , G11B7/005
摘要： Disclosed is a digital edge processor frequency control for estimating the center frequency of a recorded signal having a known format, such as data recorded on a CLV optical disk or on magnetic tape. The read channel includes a sampling detector which samples the recorded signal at a known rate to provide edge position signals (PAT) indicating the location of recorded pulse edges. An edge pattern identifier detects whether the edge signals of the recording signal match a predetermined element of the known format. Examples of predetermined elements include a pulse of a known length and whose edges are spaced a known distance, a predetermined pulse pattern, or a pulse or pattern at a known location. An interval counter is coupled to the pattern identifier for measuring the interval length between the edges of the matching pulse or pattern in units of the sample length. A center frequency estimator calculates the period of the center frequency of the matching edges by relating the matching edge interval length to a predetermined nominal wave length for the predetermined element of the known format. The result is a Tau that is used to establish the center frequency for the digital PLL.
摘要翻译： 公开了一种用于估计具有已知格式的记录信号的中心频率的数字边缘处理器频率控制，诸如记录在CLV光盘或磁带上的数据。 读通道包括采样检测器，其以已知的速率采样所记录的信号，以提供指示所记录的脉冲边缘位置的边缘位置信号（PAT）。 边缘图案标识符检测记录信号的边缘信号是否与已知格式的预定元素匹配。 预定元件的示例包括已知长度的脉冲，并且其边缘在已知位置处间隔已知距离，预定脉冲图案或脉冲或图案。 间隔计数器耦合到模式标识符，用于以样本长度为单位测量匹配脉冲或图案的边缘之间的间隔长度。 中心频率估计器通过将匹配边缘间隔长度与已知格式的预定元素的预定标称波长相关联来计算匹配边缘的中心频率的周期。 结果是用于建立数字PLL的中心频率的Tau。
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公开(公告)号：US06940682B2
公开(公告)日：2005-09-06
申请号：US10660436
申请日：2003-09-10
申请人： Nhan Xuan Bui , Robert Allen Hutchins , Glen Alan Jaquette , Larry Leeroy Tretter , Eiji Ogura , Kazuhiro Tsuruta
发明人： Nhan Xuan Bui , Robert Allen Hutchins , Glen Alan Jaquette , Larry Leeroy Tretter , Eiji Ogura , Kazuhiro Tsuruta
IPC分类号： G11B5/584
CPC分类号： G11B5/584
摘要： In a magnetic tape system, during lateral repositioning of a tape head between servo bands, the servo head is not on a servo band and is unable to provide servo position information. Hence, information about the lateral position may be lost. A control system selectively senses data read transducers of the tape head; and, upon detecting a servo signal of a servo band from a sensed data read transducer, determines the lateral position of the tape head with respect to the detected servo band based upon the position of the data read transducer that sensed the detected servo signal.
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公开(公告)号：US20080137722A1
公开(公告)日：2008-06-12
申请号：US11558949
申请日：2006-11-13
申请人： Giovanni Cherubini , Evangelos S. Eleftheriou , Robert Allen Hutchins , Glen Alan Jaquette , Sedat Oelcer
发明人： Giovanni Cherubini , Evangelos S. Eleftheriou , Robert Allen Hutchins , Glen Alan Jaquette , Sedat Oelcer
CPC分类号： G11B20/10009 , G11B20/10046 , G11B20/10212 , H04B1/7085 , H04J2013/0037 , H04L25/0212 , H04L25/03038
摘要： Methods, apparatus and computer programs are provided for multiplication-free identification of the impulse response of an oversampled data channel. An input comprising a pseudo-random binary sequence of L symbols is supplied to the channel at a symbol rate of 1/T. A channel output is produced by sampling a channel output signal corresponding to the input with a sampling interval TS=(q/p)T, where q and p are relative prime integers with q
摘要翻译： 提供了方法，装置和计算机程序，用于对过采样数据信道的脉冲响应进行无乘法识别。 将包含L个符号的伪随机二进制序列的输入以符号率1 / T提供给信道。 通过以采样间隔T S（q / p）T对与输入相对应的信道输出信号进行采样来产生信道输出，其中q和p是具有q
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公开(公告)号：US07271971B2
公开(公告)日：2007-09-18
申请号：US11003283
申请日：2004-12-03
IPC分类号： G11B5/035
摘要： A read channel equalizer of a magnetic tape drive which equalizes 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 its 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： 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 将每个偏移及其极性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。
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公开(公告)号：US07106533B2
公开(公告)日：2006-09-12
申请号：US10966531
申请日：2004-10-15
申请人： Evangelos S. Eleftheriou , Ernest Stewart Gale , Robert Allen Hutchins , Glen Alan Jaquette , Sedat Oelcer
发明人： Evangelos S. Eleftheriou , Ernest Stewart Gale , Robert Allen Hutchins , Glen Alan Jaquette , Sedat Oelcer
IPC分类号： G11B20/10
CPC分类号： H03M1/1042 , G11B20/10 , G11B2220/90
摘要： An apparatus, system, and method are disclosed for mitigating signal asymmetry. An analog to digital converter samples an analog signal from a read head and converts the sample to a digital input signal. The digital input signal addresses a look-up module, and the look-up module outputs a modified digital signal. The modified digital signal value is a specified function of the digital input signal value, wherein the specified function is configured to mitigate the asymmetry of the digital input signal. The modified digital signal value may be periodically recalculated to adjust for read head wear.
摘要翻译： 公开了一种减轻信号不对称性的装置，系统和方法。 模数转换器从读取头采样模拟信号，并将样本转换为数字输入信号。 数字输入信号寻址查找模块，查找模块输出修改后的数字信号。 修改的数字信号值是数字输入信号值的指定函数，其中指定的功能被配置为减轻数字输入信号的不对称性。 可以周期性地重新计算修改的数字信号值以调整读头磨损。
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公开(公告)号：US5930065A
公开(公告)日：1999-07-27
申请号：US859830
申请日：1997-05-16
申请人： Thomas Robert Albrecht , Robert Carl Barrett , James Howard Eaton , Robert Allen Hutchins , Glen Alan Jaquette
发明人： Thomas Robert Albrecht , Robert Carl Barrett , James Howard Eaton , Robert Allen Hutchins , Glen Alan Jaquette
CPC分类号： G11B21/10 , G11B27/107 , G11B27/3027 , G11B5/584 , G11B20/10009 , G11B2220/90
摘要： Disclosed is a magnetic tape media having addressing data information superimposed on prerecorded track following servo information. The servo information is recorded in magnetic flux transition patterns defining at least one longitudinal servo track. A servo burst pattern of at least two repeated pairs of non-parallel magnetic flux transitions is provided, at least one of which transitions is slanted or otherwise continuously longitudinally variable across the width of the servo track. At least two transitions of the repeated pairs are shifted longitudinally with respect to other of the transitions, the shifted transitions comprising the superimposed addressing data information. Also disclosed is a magnetic tape media having prerecorded combined servo and data information recorded in repeated pairs of magnetic flux dual transitions, at least one of the repeated pairs of dual transitions having a different width with respect to other of the transitions, the different width transitions comprising data information.
摘要翻译： 公开了一种磁带介质，其具有叠加在伺服信息之后的预先记录的轨道上的寻址数据信息。 伺服信息被记录在限定至少一个纵向伺服轨道的磁通转变图案中。 提供了至少两个重复的非平行磁通转换对的伺服突发图案，其中至少一个转变在伺服轨迹的宽度上倾斜或以其它方式连续纵向变化。 重复对的至少两个转换相对于其他转换被纵向移动，移位的转换包括叠加的寻址数据信息。 还公开了一种磁带介质，其具有以重复的磁通双重转换对记录的预先记录的组合伺服和数据信息，重复的双重转换对中的至少一个相对于其他转换具有不同的宽度，不同的宽度转变 包括数据信息。
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公开(公告)号：US07639444B2
公开(公告)日：2009-12-29
申请号：US10737563
申请日：2003-12-15
CPC分类号： G11B20/10009
摘要： Disclosed is a technique for updating a read-detect channel. A signal is processed in a read-detect channel that has one or more programmable registers. While signals continue to be processed by the read-detect channel, it is determined with a channel auxiliary processor whether to dynamically replace values of the one or more programmable registers. When it is determined that values of the one or more programmable registers are to be replaced, a channel auxiliary processor determines values for the one or more programmable registers and replaces existing values for the one or more programmable registers with the determined values.
摘要翻译： 公开了一种更新读取检测通道的技术。 在具有一个或多个可编程寄存器的读取检测通道中处理信号。 当信号继续由读取检测通道处理时，用信道辅助处理器确定是否动态地替换一个或多个可编程寄存器的值。 当确定要替换一个或多个可编程寄存器的值时，信道辅助处理器确定一个或多个可编程寄存器的值，并用所确定的值替换一个或多个可编程寄存器的现有值。
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9.发明申请MAGNETIC TAPE READ CHANNEL SIGNAL VALUES DEVELOPED EMPLOYING INTERMEDIATE BITS OF THE PATH MEMORY OF A PRML VITERBI DETECTOR 失效磁带读取通道信号值开发使用PRML VITERBI检测器的路径存储器的中间位公开(公告)号：US20080253012A1
公开(公告)日：2008-10-16
申请号：US12143385
申请日：2008-06-20
IPC分类号： G11B5/09
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。
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公开(公告)号：US07359135B2
公开(公告)日：2008-04-15
申请号：US11733934
申请日：2007-04-11
IPC分类号： G11B5/35
摘要： A read channel equalizer of a magnetic tape drive which equalizes 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： 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。
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