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1. 发明授权

US07394608B2 Read channel apparatus for asynchronous sampling and synchronous equalization 有权
标题翻译：用于异步采样和同步均衡的通道设备
公开(公告)号：US07394608B2
公开(公告)日：2008-07-01
申请号：US11213127
申请日：2005-08-26
申请人： Evangelos S. Eleftheriou , Robert A. Hutchins , Glen A. Jaquette , Jens Jelitto , Sedat Oelcer
发明人： Evangelos S. Eleftheriou , Robert A. Hutchins , Glen A. Jaquette , Jens Jelitto , Sedat Oelcer
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。

2. 发明授权

US07684139B2 Read channel apparatus for asynchronous sampling and synchronous equalization 有权
标题翻译：用于异步采样和同步均衡的通道设备
公开(公告)号：US07684139B2
公开(公告)日：2010-03-23
申请号：US12166136
申请日：2008-07-01
申请人： Evangelos S. Eleftheriou , Robert A. Hutchins , Glen A. Jaquette , Jens Jelitto , Sedat Oeloer
发明人： Evangelos S. Eleftheriou , Robert A. Hutchins , Glen A. Jaquette , Jens Jelitto , Sedat Oeloer
IPC分类号： G11B5/035
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。

3. 发明授权

US5568465A Reading from record medium in either an inverted or non-inverted signal-processing mode 失效
标题翻译：以倒置或非反相信号处理模式从记录介质读取
公开(公告)号：US5568465A
公开(公告)日：1996-10-22
申请号：US416399
申请日：1995-04-07
申请人： Robert A. Hutchins , Glen A. Jaquette
发明人： Robert A. Hutchins , Glen A. Jaquette
IPC分类号： G11B7/005 , G11B19/04 , G11B20/10 , G11B7/00
CPC分类号： G11B20/10 , G11B19/04 , G11B7/005
摘要： In a write-once read-many (WORM) optical disk device recorded unipolar pulse signals having a high lineal recorded densities are read back using an inverted analog signal processing channel that processes the read back signal after polarity inversion of the read back signal. Some fields in each sector of an optical disk are recorded at a specific maximal mark density pattern. Read back of such fields is signal processed using non-inverted read back analog signal processing, i.e. the read back unipolar pulse signal is processed without polarity inversion. In the non-inverted read back, automatic gain control of the read signal is turned off such that amplification of the read back signal is at a constant gain. Also during non-inverted read back, low read back signal amplitude results in degating the read back output. These signal processing techniques produce a pulse stream which can be further processed by a circuit which qualifies acceptable time intervals and a counter to robustly determine whether the field has been written. Digital signal processing provides signal detection with or without read back signal inversion while maintaining robust flag signal detection. Digital automatic gain control is effected to an acceptable range of signal amplitudes either continuously, on a sector basis, detected error basis or session basis.
摘要翻译：在一次写入多次（WORM）光盘装置中，记录具有高线性记录密度的单极性脉冲信号，使用反相模拟信号处理通道读回，该反相模拟信号处理通道在读回信号的极性反转之后处理回读信号。以特定的最大标记密度图案记录光盘的每个扇区中的一些场。使用非反相回读模拟信号处理对这些场的读回信号进行信号处理，即回读单极性脉冲信号在无极性反转的情况下进行处理。在非反相读取中，读取信号的自动增益控制被关闭，使得读回信号的放大处于恒定的增益。此外，在非反相读回时，低回读信号幅度导致读回输出脱磁。这些信号处理技术产生脉冲流，该脉冲流可以由限定可接受的时间间隔的电路进一步处理，并且计数器可鲁棒地确定该场是否被写入。数字信号处理提供具有或不具有回读信号反转的信号检测，同时保持鲁棒的标志信号检测。数字自动增益控制可以连续地，以扇区为基础，以检测到的误差基础或会话为基础进行信号幅度的可接受范围。

4. 发明授权

US5629914A Data-transition threshold following in optical recording 失效
公开(公告)号：US5629914A
公开(公告)日：1997-05-13
申请号：US407125
申请日：1995-03-20
申请人： Alan R. Clark , Robert A. Hutchins , Glen A. Jaquette , Ara S. Patapoutian , Pantas Sutardja
发明人： Alan R. Clark , Robert A. Hutchins , Glen A. Jaquette , Ara S. Patapoutian , Pantas Sutardja
IPC分类号： G11B7/0037 , G11B20/10 , G11B7/00
CPC分类号： G11B20/10203 , G11B20/10037 , G11B7/00375
摘要： In a pulse width modulated read signal channel for an optical disk drive, a data-transition threshold is maintained for data detection by a threshold tracking circuit that estimates the amplitude centerline data-transition threshold from the most recent maximum and minimum values of the read signal waveform. To improve the accuracy of the response of the centerline estimator, the threshold is increased or decreased based on the phase error at each read signal transition through the data-transition threshold. In addition, defects in the optical recording media are detected, and a defect present signal is used to inhibit the transition phase error input to the centerline estimator. This prevents the estimator from moving the threshold to an incorrect stable level. In addition, the defect present signal boosts the error feedback in the centerline estimator. The estimator then more quickly follows the read signal waveform. As a result, the estimator reacquires the centerline of the waveform after the read head moves past the defect without retriggering the defect detection circuit.

5. 发明授权

US07019922B2 Apparatus and method to read information from a tape storage medium 有权
标题翻译：从磁带存储介质读取信息的装置和方法
公开(公告)号：US07019922B2
公开(公告)日：2006-03-28
申请号：US10426403
申请日：2003-04-29
申请人： James J. Howarth , Robert A. Hutchins , Glen A. Jaquette
发明人： James J. Howarth , Robert A. Hutchins , Glen A. Jaquette
IPC分类号： G11B20/10 , G11B5/035
CPC分类号： G11B20/10055 , G11B5/00813 , G11B5/09 , G11B20/10009 , G11B20/10481 , G11B20/1403 , G11B27/328 , G11B27/36 , G11B2220/90
摘要： A method to read information from a tape storage medium, where that tape includes a calibration region and a data region. The method uses a read channel having a first detection mode and a second detection mode. The method initializes the first detection mode and forms a calibration waveform comprising information read from the calibration region using the first detection mode. The method then defines a plurality of bit cell boundaries, initializes the second detection mode, and reads information from the data region using the second detection mode.
摘要翻译：从磁带存储介质读取信息的方法，其中该磁带包括校准区域和数据区域。该方法使用具有第一检测模式和第二检测模式的读取通道。该方法初始化第一检测模式并且形成包括使用第一检测模式从校准区域读取的信息的校准波形。该方法然后定义多个位单元边界，初始化第二检测模式，并使用第二检测模式从数据区读取信息。

6. 发明授权

US08854759B2 Combined soft detection/soft decoding in tape drive storage channels 有权
标题翻译：在磁带机存储通道中组合软检测/软解码
公开(公告)号：US08854759B2
公开(公告)日：2014-10-07
申请号：US13454935
申请日：2012-04-24
申请人： Roy D. Cideciyan , Robert A. Hutchins , Thomas Mittelholzer , Sedat Oelcer
发明人： Roy D. Cideciyan , Robert A. Hutchins , Thomas Mittelholzer , Sedat Oelcer
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。

7. 发明授权

US08797670B2 Adaptive soft-output detector for magnetic tape read channels 有权
标题翻译：用于磁带读取通道的自适应软输出检测器
公开(公告)号：US08797670B2
公开(公告)日：2014-08-05
申请号：US13527508
申请日：2012-06-19
申请人： Katherine T. Blinick , Robert A. Hutchins , Thomas Mittelholzer , Sedat Oelcer
发明人： Katherine T. Blinick , Robert A. Hutchins , Thomas Mittelholzer , Sedat Oelcer
IPC分类号： G11B5/035 , G11B20/10
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。

8. 发明授权

US08743498B2 Adaptive soft-output detector for magnetic tape read channels 失效
标题翻译：用于磁带读取通道的自适应软输出检测器
公开(公告)号：US08743498B2
公开(公告)日：2014-06-03
申请号：US13527473
申请日：2012-06-19
申请人： Katherine T. Blinick , Robert A. Hutchins , Thomas Mittelholzer , Sedat Oelcer
发明人： Katherine T. Blinick , Robert A. Hutchins , Thomas Mittelholzer , Sedat Oelcer
IPC分类号： G11B5/035 , G11B20/10
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。

9. 发明授权

US08670199B2 Data-dependent noise-predictive maximum likelihood detection (DD-NPML) for magnetic recording 有权
标题翻译：用于磁记录的数据相关噪声预测最大似然检测（DD-NPML）
公开(公告)号：US08670199B2
公开(公告)日：2014-03-11
申请号：US12753586
申请日：2010-04-02
申请人： Katherine T. Blinick , Evangelos S. Eleftheriou , Robert A. Hutchins , Sedat Oelcer
发明人： Katherine T. Blinick , Evangelos S. Eleftheriou , Robert A. Hutchins , Sedat Oelcer
IPC分类号： G11B5/09
CPC分类号： G11B20/10009 , G11B20/10046 , G11B20/10074 , G11B20/10175 , G11B20/10287 , G11B2220/90
摘要： In one embodiment, a method includes applying one or more whitening filters to an input stream of digitized samples from a magnetic data channel to produce a filtered sequence, performing one or more branch metric calculations to the filtered sequence to produce a branch metric, and applying a multi-state data-dependent noise-predictive maximum likelihood (DD-NPML) detector to the branch metric to produce an output stream. In another embodiment, a multi-channel data storage system includes a head for reading data from a storage medium, logic for applying one or more whitening filters to an input stream of digitized samples from a magnetic data channel to produce a filtered sequence, logic for performing one or more branch metric calculations to the filtered sequence to produce a branch metric, and logic for applying a multi-state DD-NPML detector to the branch metric to produce an output stream. Other systems and methods are described as well.
摘要翻译：在一个实施例中，一种方法包括将一个或多个白化滤波器应用于来自磁数据信道的数字化样本的输入流，以产生经滤波的序列，对经滤波的序列执行一个或多个分支度量计算以产生分支度量，以及应用用于产生输出流的分支度量的多状态数据相关噪声预测最大似然（DD-NPML）检测器。在另一个实施例中，多通道数据存储系统包括用于从存储介质读取数据的头，用于将一个或多个白化滤波器应用于来自磁数据通道的数字化采样的输入流以产生滤波序列的逻辑，用于对经滤波的序列执行一个或多个分支度量计算以产生分支度量，以及将多状态DD-NPML检测器应用于分支度量以产生输出流的逻辑。还描述了其他系统和方法。

10. 发明申请

US20130279040A1 COMBINED SOFT DETECTION/SOFT DECODING IN TAPE DRIVE STORAGE CHANNELS 有权
标题翻译：组合软检测/软盘解码在磁带驱动器存储通道
公开(公告)号：US20130279040A1
公开(公告)日：2013-10-24
申请号：US13454935
申请日：2012-04-24
申请人： Roy D. Cideciyan , Robert A. Hutchins , Thomas Mittelholzer , Sedat Oelcer
发明人： Roy D. Cideciyan , Robert A. Hutchins , Thomas Mittelholzer , Sedat Oelcer
IPC分类号： G06F11/16 , G11B20/18
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。

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