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11. 发明授权

US07173784B2 Apparatus for providing data dependent detection in a data read channel 失效
标题翻译：用于在数据读取通道中提供数据相关检测的装置
公开(公告)号：US07173784B2
公开(公告)日：2007-02-06
申请号：US10683646
申请日：2003-10-10
申请人： Roy D. Cideciyan , Ajay Dholakia , Evangelos Eleftheriou , Richard L. Galbraith , Thomas Mittelholzer , Travis R. Oenning
发明人： Roy D. Cideciyan , Ajay Dholakia , Evangelos Eleftheriou , Richard L. Galbraith , Thomas Mittelholzer , Travis R. Oenning
IPC分类号： G11B5/09 , H03M13/03 , H03D1/00
CPC分类号： G11B20/10296 , G11B20/10009 , G11B20/24
摘要： An apparatus for providing data dependent detection in a data read channel is disclosed. Parameters in a read channel are dynamically adjusted according to data dependent noise. For example, a comparison in an add-compare-select (ACS) unit of a Viterbi decoder may be adjusted or offset terms in error event filters may be biased to choose a Viterbi sequence with more transitions or to compensate for polarity dependent noise.
摘要翻译：公开了一种用于在数据读取通道中提供数据相关检测的装置。读通道中的参数根据数据相关噪声进行动态调整。例如，可以调整维特比解码器的加法比较选择（ACS）单元中的比较，或者错误事件滤波器中的偏移项可能被偏置以选择具有更多跃迁的维特比序列或补偿极性相关噪声。

12. 发明授权

US07164371B2 Method and apparatus for data coding for high density recording channels exhibiting low frequency contents 失效
标题翻译：用于数据编码用于显示低频内容的高密度记录通道的方法和装置
公开(公告)号：US07164371B2
公开(公告)日：2007-01-16
申请号：US10903978
申请日：2004-07-30
申请人： Yuan Xing Lee , Ismail Demirkan , Richard L. Galbraith , Evangelos Eleftheriou , Roy D. Cideciyan
发明人： Yuan Xing Lee , Ismail Demirkan , Richard L. Galbraith , Evangelos Eleftheriou , Roy D. Cideciyan
IPC分类号： H03M5/00
CPC分类号： G11B20/1426 , G11B2020/1457 , H03M5/145
摘要： A method and apparatus for data coding for high-density recording channels exhibiting low frequency contents is disclosed. Coding is used that satisfies both Running Digital Sum (RDS) and Maximum Transition Run (MTR) properties, which are desirable for achieving high-density recording for recording channels exhibiting low frequency components such as perpendicular magnetic recording channel.
摘要翻译：公开了一种用于对显示低频内容的高密度记录通道进行数据编码的方法和装置。使用满足运行数字和（RDS）和最大转移运行（MTR）性质的编码，这是实现用于记录显示低频分量的通道的高密度记录所希望的，例如垂直磁记录通道。

13. 发明授权

US5619539A Data detection methods and apparatus for a direct access storage device 失效
标题翻译：用于直接存取存储装置的数据检测方法和装置
公开(公告)号：US5619539A
公开(公告)日：1997-04-08
申请号：US203413
申请日：1994-02-28
申请人： Jonathan D. Coker , Francois B. Dolivo , Richard L. Galbraith , Reto J. Hermann , Walter Hirt , Kevin Vannorsdel
发明人： Jonathan D. Coker , Francois B. Dolivo , Richard L. Galbraith , Reto J. Hermann , Walter Hirt , Kevin Vannorsdel
IPC分类号： G11B20/10 , G11B20/18 , H03H15/00 , H03H17/00 , H03H21/00 , H03M13/23 , H04B3/04 , H04L5/02 , H04L27/06
CPC分类号： G11B20/10074 , G11B20/10009
摘要： A method and apparatus are provided for maximum-likelihood data detection in a partial-response (PR) data channel including a head and disk assembly providing an analog signal coupled to an analog to digital converter (ADC) providing digital samples. A plurality of digital samples are received from the ADC. The received digital samples are applied to a selected first filter and a selected second filter. The first filtered digital samples are applied to a first data detector, and the second filtered digital samples are applied to a second data detector. A predetermined parameter is identified, and at least one of the first and second data detectors is selected responsive to the identified predetermined parameter.
摘要翻译：提供了一种用于部分响应（PR）数据信道中的最大似然数据检测的方法和装置，包括提供耦合到提供数字样本的模数转换器（ADC）的模拟信号的头和盘组件。从ADC接收多个数字采样。所接收的数字样本被应用于所选择的第一滤波器和选择的第二滤波器。将第一滤波数字样本应用于第一数据检测器，并将第二滤波数字样本应用于第二数据检测器。识别预定参数，并且响应于所识别的预定参数来选择第一和第二数据检测器中的至少一个。

14. 发明授权

US5258940A Distributed arithmetic digital filter in a partial-response maximum-likelihood disk drive system 失效
标题翻译：分布式算术数字滤波器在部分响应最大似然磁盘驱动器系统中
公开(公告)号：US5258940A
公开(公告)日：1993-11-02
申请号：US851817
申请日：1992-03-16
申请人： Jonathan D. Coker , Richard L. Galbraith , Pablo A. Ziperovich
发明人： Jonathan D. Coker , Richard L. Galbraith , Pablo A. Ziperovich
IPC分类号： G11B5/09 , H03H17/06 , H03H21/00 , G06F15/31
CPC分类号： H03H17/06
摘要： A 10-tap finite impulse response (FIR) digital filter is provided in a partial response signaling and maximum-likelihood (PRML) data channel. A plurality of partial sums of predetermined tap weights are stored in a palette random access memory (RAM). A fixed qualifier value is received and used together with selected ones of the stored partial sums for calculating a predetermined tap weight. Predetermined filter coefficients are calculated and stored in a filter RAM using the calculated predetermined tap weight and predefined ones of the stored partial sums.
摘要翻译：在部分响应信令和最大似然（PRML）数据信道中提供10抽头有限脉冲响应（FIR）数字滤波器。多个预定抽头权重的部分和存储在调色板随机存取存储器（RAM）中。接收固定的限定符值并与所选存储的部分和一起使用以用于计算预定抽头权重。使用计算的预定抽头权重和存储的部分和的预定义的抽头权重来计算预定的滤波器系数并将其存储在滤波器RAM中。

15. 发明授权

US5168413A Transducer head flying height monitoring methods and apparatus for disk drive system 失效
标题翻译：传感器头部飞行高度监测方法和装置用于磁盘驱动系统
公开(公告)号：US5168413A
公开(公告)日：1992-12-01
申请号：US621010
申请日：1990-11-30
申请人： Jonathan D. Coker , Richard L. Galbraith , Paul P. Howard , Gregory J. Kerwin , Gordon J. Smith
发明人： Jonathan D. Coker , Richard L. Galbraith , Paul P. Howard , Gregory J. Kerwin , Gordon J. Smith
IPC分类号： G11B20/12 , G11B19/04 , G11B21/21 , G11B27/36 , G11B33/10
CPC分类号： G11B27/36 , G11B19/04 , G11B21/21 , G11B33/10 , G11B20/10055
摘要： A method and apparatus are provided for measuring flying height changes of a transducer head relative to a disk surface of a rotating disk in a disk file. A predetermined pattern is written on at least one predetermined region of the disk file. The predetermined region is normally not rewritten during operation of the disk file. At least one readback signal is sensed from at least one predetermined region of the disk surface. A plurality of sample values are identified corresponding to each readback signal. A change in the flying height is calculated utilizing the identified sample values. A frequency equalization number K can be utilized to calculate the magnitude and sign of the flying height change. Alternatively, real-time digital analysis of a predetermined pattern written on at least one predetermined region of the disk surface can be utilized to calculate the magnitude and sign of the flying height change.
摘要翻译：提供一种用于测量换能器头相对于盘文件中的旋转盘的盘表面的飞行高度变化的方法和装置。预定图案被写在盘文件的至少一个预定区域上。通常在磁盘文件的操作期间不改写预定区域。从盘表面的至少一个预定区域感测至少一个回读信号。对应于每个回读信号识别多个样本值。使用识别的样本值计算飞行高度的变化。可以使用频率均衡数K来计算飞行高度变化的大小和符号。或者，可以使用写在盘表面的至少一个预定区域上的预定图案的实时数字分析来计算飞行高度变化的大小和符号。

16. 发明授权

US5426541A Self-equalization method for partial-response maximum-likelihood disk drive systems 失效
标题翻译：部分响应最大似然磁盘驱动系统的自均衡方法
公开(公告)号：US5426541A
公开(公告)日：1995-06-20
申请号：US221321
申请日：1994-03-31
申请人： Jonathan D. Coker , Richard L. Galbraith , Walter Hirt , David J. Stanek , Mark D. Warne
发明人： Jonathan D. Coker , Richard L. Galbraith , Walter Hirt , David J. Stanek , Mark D. Warne
IPC分类号： G11B5/09 , G11B20/10
CPC分类号： G11B20/10009 , G11B5/09
摘要： Apparatus and method for providing equalization adjustment for a filter are provided in a PRML data channel. A first predetermined test pattern is written. Relative error is measured in both magnitude and phase for predetermined frequencies. A relative magnitude ratio for the predetermined frequencies and a phase delay between the predetermined frequencies are identified. A tap set is generated having predefined frequency responses at a plurality of predefined discrete frequencies.
摘要翻译：在PRML数据信道中提供用于提供滤波器的均衡调整的装置和方法。写入第一预定测试图案。在预定频率的幅度和相位上测量相对误差。识别预定频率的相对幅度比和预定频率之间的相位延迟。在多个预定离散频率处产生具有预定频率响应的抽头集合。

17. 发明授权

US5357520A Method and apparatus for precompensation value determination in a PRML data channel 失效
标题翻译： 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
申请人： Patrick C. Arnett , Jonathan D. Coker , Richard L. Galbraith , Yaw-Shing Tang , Roger W. Wood
发明人： Patrick C. Arnett , Jonathan D. Coker , Richard L. Galbraith , Yaw-Shing Tang , Roger W. Wood
IPC分类号： G11B5/09 , G11B20/10 , G11B20/18 , G11C29/00
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。

18. 发明授权

US5268848A Equalizer adjustment for partial-response maximum-likelihood disk drive systems 失效
标题翻译：部分响应最大似然磁盘驱动器系统的均衡器调整
公开(公告)号：US5268848A
公开(公告)日：1993-12-07
申请号：US954085
申请日：1992-09-30
申请人： Jonathan D. Coker , Richard L. Galbraith , Gary W. Walker
发明人： Jonathan D. Coker , Richard L. Galbraith , Gary W. Walker
IPC分类号： G11B20/10 , H03H15/00 , H03H17/00 , H03H17/06 , H03H21/00 , H04B3/14 , G06F15/31
CPC分类号： G11B20/10009 , H03H17/06
摘要： Apparatus and method for providing equalization adjustment for a finite impulse response (FIR) digital filter are provided in a PRML data channel. A plurality of transformations are defined to transform effective tap weights in a digital filter into modified effective tap weight values by adding each said initial effective tap weight value with a selected cosine equalization adjustment function. A cosine expander circuit is provided for expanding 8-byte compressed equalizations into a 32-byte format and for altering the filter response by a selected cosine equalization adjustment function.
摘要翻译：在PRML数据通道中提供用于提供有限脉冲响应（FIR）数字滤波器的均衡调整的装置和方法。定义多个变换以通过将每个所述初始有效抽头加权值与所选余弦均衡调整函数相加来将数字滤波器中的有效抽头权重变换为经修改的有效抽头加权值。提供余弦扩展器电路用于将8字节压缩均衡扩展为32字节格式，并通过所选余弦均衡调整功能来改变滤波器响应。

19. 发明授权

US5220466A Method and apparatus for digital filter control in a partial-response maximum-likelihood disk drive system 失效
标题翻译：部分响应最大似然磁盘驱动系统中数字滤波器控制的方法与装置
公开(公告)号：US5220466A
公开(公告)日：1993-06-15
申请号：US703520
申请日：1991-05-21
申请人： Jonathan D. Coker , Francois B. Dolivo , Richard L. Galbraith , Wolfgang H. Schott , Pablo A. Ziperovich
发明人： Jonathan D. Coker , Francois B. Dolivo , Richard L. Galbraith , Wolfgang H. Schott , Pablo A. Ziperovich
IPC分类号： G11B5/09 , G11B19/02 , G11B20/10 , G11B20/14 , H03H21/00 , H04B3/04 , H04L25/497
CPC分类号： G11B20/1426 , G11B19/02 , G11B20/10009
摘要： A method and apparatus are provided for controlling a digital filter function included in a data path within gain and timing control loops of a PRML magnetic recording channel. The digital filter function is removed from the data path during an acquisition mode and the digital filter function is restored to the data path during a tracking mode. A predetermined gain and a quantized delay at a synchronization frequency are provided when switching from acquisition mode to tracking mode. A unity gain and a delay of an integer number of sample periods are provided at a synchronization frequency when switching from acquisition mode to tracking mode.

20. 发明授权

US5438460A Asynchronous gain adjustment for PRML disk drive systems 失效
标题翻译： PRML磁盘驱动器系统的异步增益调整
公开(公告)号：US5438460A
公开(公告)日：1995-08-01
申请号：US247501
申请日：1994-05-23
申请人： Jonathan D. Coker , Richard L. Galbraith
发明人： Jonathan D. Coker , Richard L. Galbraith
IPC分类号： G11B5/09 , G11B20/10
CPC分类号： G11B20/10009
摘要： Apparatus and method for asynchronous gain adjustment are provided for data detection in a partial-response maximum-likelihood (PRML) data channel. The PRML data channel includes an analog to digital converter (ADC) having a normal operating range and a filter, gain and timing control coupled to the ADC. A plurality of samples are detected from the ADC. Each of the detected samples are sequentially compared with predetermined threshold values. The predetermined threshold values include a zero value, and a minimum value and a maximum value of the normal operating range of the ADC. An absolute value of each of the detected samples are sequentially compared with a forth predetermined threshold value. A gain adjustment correction value is determined utilizing the sequentially compared values.
摘要翻译：提供用于异步增益调整的装置和方法用于部分响应最大似然（PRML）数据信道中的数据检测。 PRML数据通道包括具有正常操作范围的模数转换器（ADC）和耦合到ADC的滤波器，增益和定时控制。从ADC检测多个采样。将每个检测到的样本顺序地与预定阈值进行比较。预定阈值包括零值，以及ADC的正常工作范围的最小值和最大值。将检测出的每个样本的绝对值顺序地与第四预定阈值进行比较。利用顺序比较的值确定增益调整校正值。

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