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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。
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2.发明申请Using at least one servo channel to provide timing recovery and timing information to data channels 失效使用至少一个伺服通道来向数据通道提供定时恢复和定时信息公开(公告)号：US20070177292A1
公开(公告)日：2007-08-02
申请号：US11346391
申请日：2006-02-01
申请人： Nhan Bui , Giovanni Cherubini , Evangelos Eleftheriou , Robert Hutchins , Glen Jaquette , Jens Jelitto , Sedat Oelcer , Mark Taylor
发明人： Nhan Bui , Giovanni Cherubini , Evangelos Eleftheriou , Robert Hutchins , Glen Jaquette , Jens Jelitto , Sedat Oelcer , Mark Taylor
IPC分类号： G11B5/09
CPC分类号： G11B27/36 , G11B20/10037 , G11B20/10046 , G11B20/10055 , G11B20/10212 , G11B20/10259 , G11B20/1403 , G11B20/1876 , G11B27/10 , G11B2020/10592 , G11B2220/90 , G11B2220/95
摘要： Provided is a read channel, storage drive, and method to process signals read from a storage medium. At least one data channel including an interpolator and equalizer and a servo channel includes an interpolator. A timing recovery function processes a timing error from the interpolator in the servo channel to calculate interpolation timing information used by the interpolator to interpolate a servo channel signal. A path is coupled to the timing recovery function and the interpolator in the at least one data channel to communicate the interpolation timing information to the interpolator in the at least one data channel. The interpolator in the at least one data channel is configured to use the interpolation timing information to interpolate an asynchronous data channel signal.
摘要翻译： 提供了一种用于处理从存储介质读取的信号的读通道，存储驱动器和方法。 包括内插器和均衡器和伺服信道的至少一个数据信道包括内插器。 定时恢复功能处理来自伺服信道中的内插器的定时误差，以计算内插器使用的内插定时信息来内插伺服信道信号。 路径耦合到至少一个数据信道中的定时恢复功能和内插器，以将内插定时信息传送到至少一个数据信道中的内插器。 所述至少一个数据信道中的内插器被配置为使用内插定时信息来内插异步数据信道信号。
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3.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。
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公开(公告)号：US20060119969A1
公开(公告)日：2006-06-08
申请号：US11003283
申请日：2004-12-03
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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5.发明申请公开(公告)号：US20070047121A1
公开(公告)日：2007-03-01
申请号：US11213127
申请日：2005-08-26
IPC分类号： G11B5/09
CPC分类号： G11B20/10009 , G11B20/10027 , G11B20/10046 , G11B20/10055
摘要： A read channel and method using that read channel are disclosed. The read channel comprises an analog to digital converter which asynchronously samples at a fixed rate an analog signal formed by reading a data track, where that data track was written to a data storage medium at a symbol rate and an interpolator interconnected with the analog to digital converter. The read channel further comprises a fractionally-spaced equalizer, where the interpolator provides an interpolated signal to the fractionally-spaced equalizer at an interpolation rate, where that interpolation rate is greater than the symbol rate. The fractionally-spaced equalizer forms a synchronous equalized signal. The read channel further comprises a gain control module interconnected with the fractionally-spaced equalizer, and a sequence detector interconnected with the gain control module.
摘要翻译： 公开了使用该读通道的读通道和方法。 读通道包括模数转换器，其以固定速率异步采样通过读取数据轨道形成的模拟信号，其中数据轨道以符号速率写入数据存储介质，并且与模数转换器互连的内插器 转换器。 读通道还包括分数间隔的均衡器，其中内插器以内插速率向分数间隔的均衡器提供内插信号，其中该内插速率大于符号率。 分数间隔均衡器形成同步均衡信号。 读通道还包括与分数间隔均衡器互连的增益控制模块，以及与增益控制模块互连的序列检测器。
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公开(公告)号：US20060082915A1
公开(公告)日：2006-04-20
申请号：US10966531
申请日：2004-10-15
IPC分类号： G11B5/02
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.
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公开(公告)号：US20060176982A1
公开(公告)日：2006-08-10
申请号：US11054060
申请日：2005-02-09
申请人： David Berman , Evangelos Eleftherion , Robert Hutchins , Glen Jaquette , Constantin Melas , Sedat Oelcer
发明人： David Berman , Evangelos Eleftherion , Robert Hutchins , Glen Jaquette , Constantin Melas , Sedat Oelcer
CPC分类号： G11B20/10009 , G11B20/10046 , G11B20/10296 , G11B2220/2516
摘要： An apparatus, system, and method are disclosed for asymmetric maximum likelihood detection. An initialization module initializes a plurality of branch metrics and a plurality of path memories. A coefficient module calculates a plurality of coefficients. A computation module calculates a first and second specified likelihood function. A selection module calculates a third specified branch metric as the maximum of the first and second specified likelihood functions. A path metrics module calculates a third specified path memory from a first and second specified path memory. A results module identifies a data output value from one or more path memories.
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8.发明申请Method and apparatus for providing error correction capability to longitudinal position data 有权向纵向位置数据提供纠错能力的方法和装置公开(公告)号：US20070044007A1
公开(公告)日：2007-02-22
申请号：US11205713
申请日：2005-08-17
IPC分类号： H03M13/00
CPC分类号： G11B20/1201 , G11B20/18 , G11B20/1866 , G11B20/20 , G11B2020/1282 , G11B2020/1284 , G11B2220/90
摘要： A method and apparatus for providing error correction capability to longitudinal position data are disclosed. Initially, data are encoded via a set of even LPOS words and a set of odd LPOS words. The encoded data are then decoded by generating a set of syndrome bits for each of the LPOS words. A determination is then made as to whether or not there is an error within one of the LPOS words based on its corresponding syndrome bits.
摘要翻译： 公开了一种向纵向位置数据提供纠错能力的方法和装置。 最初，通过一组偶数LPOS字和一组奇数LPOS字对数据进行编码。 然后通过为每个LPOS字生成一组校正子位来解码编码数据。 然后，基于其对应的校正子位确定是否存在LPOS字之一内的错误。
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公开(公告)号：US20050144534A1
公开(公告)日：2005-06-30
申请号：US10737563
申请日：2003-12-15
申请人： Robert Hutchins , Glen Jaquette , David Berman , Constantin Melas
发明人： Robert Hutchins , Glen Jaquette , David Berman , Constantin Melas
IPC分类号： G06F11/00
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. Also disclosed is a technique in which the determined values for the one or more programmable registers are determined using a sample of the signal. Moreover, disclosed is a technique in which the channel auxiliary processor receives error information for the signal and determines whether to replace values of the one or more programmable registers with stored values based on the error information.
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。 还公开了一种技术，其中使用信号的采样来确定一个或多个可编程寄存器的确定值。 此外，公开了一种技术，其中信道辅助处理器接收信号的错误信息，并且基于错误信息确定是否用存储的值替换一个或多个可编程寄存器的值。
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10.发明申请Data read transducers for determining lateral position of a tape head with respect to longitudinal servo bands of magnetic tape 失效用于确定磁带头相对于磁带的纵向伺服带的横向位置的数据读取换能器公开(公告)号：US20050052778A1
公开(公告)日：2005-03-10
申请号：US10660436
申请日：2003-09-10
申请人： Nhan Bui , Robert Hutchins , Glen Jaquette , Larry Tretter , Eiji Ogura , Kazuhiro Tsuruta
发明人： Nhan Bui , Robert Hutchins , Glen Jaquette , Larry 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.
摘要翻译： 在磁带系统中，在磁头在伺服带之间的侧向重新定位期间，伺服磁头不在伺服带上，并且不能提供伺服位置信息。 因此，有关横向位置的信息可能会丢失。 控制系统选择性地感测磁带头的数据读取换能器; 并且在检测到来自感测数据读取换能器的伺服频带的伺服信号时，基于感测检测到的伺服信号的数据读取换能器的位置，确定磁带头相对于检测到的伺服频带的横向位置。
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