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1.发明授权Compensation of write current adn delta-V for recording component and radial position 失效用于记录组件和径向位置的写入电流adn delta-V的补偿
公开(公告)号：US4821125A
公开(公告)日：1989-04-11
申请号：US872793
申请日：1986-06-11
申请人： Thomas C. Christensen , Jonathan D. Coker , Earl A. Cunningham , Richard C. Jaworski , Gregory J. Kerwin , Dean C. Palmer , Jeffrey R. Roepke
发明人： Thomas C. Christensen , Jonathan D. Coker , Earl A. Cunningham , Richard C. Jaworski , Gregory J. Kerwin , Dean C. Palmer , Jeffrey R. Roepke
CPC分类号： G11B20/10481 , G11B20/1816 , G11B27/36 , G11B5/012 , G11B5/455 , G11B2005/0013 , G11B2020/183 , G11B5/035
摘要： A magnetic disk drive channel circuitry is shown and described that generates eight incremental values of write current and eight incremental values of delta-V (the minimum voltage change per unit time which tests signals to discriminate between data and noise). Each of these variable parameter values may be program selected by a three bit bus signal. This variability testing of an adaptation to the optimum parameter value for each head media combination and by grouping tracks in contiguous data bands, the parameters may be optimized for tracks near the inner diameter, the outer diameter and in the middle band. The variable delta-V can also be used as an additional data recovery tool wherein re-reading with a lower value enhances recovery of missing bit errors and re-reading with an increased value can assist recovery from an extra bit error.
摘要翻译： 显示和描述了磁盘驱动器通道电路，其产生写入电流的八个增量值和delta-V的八个增量值（每单位时间的最小电压变化，其测试信号以区分数据和噪声）。 这些可变参数值中的每一个可以由三位总线信号来选择程序。 对于每个头部介质组合的最佳参数值的适应性以及通过对连续的数据带中的轨道进行分组的这种可变性测试，可以针对靠近内径，外径和中间带的轨迹优化参数。 变量delta-V也可以用作额外的数据恢复工具，其中用较低值重新读取增强了丢失位错误的恢复，并且用增加的值重新读取可以帮助从额外的位错误中恢复。
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2.发明授权Transducer head flying height monitoring methods and apparatus for disk drive system 失效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
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。
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公开(公告)号：US07482965B1
公开(公告)日：2009-01-27
申请号：US11305819
申请日：2005-12-16
IPC分类号： H03M1/12
CPC分类号： G06G7/26
摘要： A chirp waveform generator for producing a chirp waveform ƒ(t)=sin (t2 modulus m) where modulus m is represented by n submoduli and/or factored submoduli m1-mn. Sequence generators generate digital sequence values representative of sequences of quadratic residues for each submoduli and/or factored submoduli m1-mn. Sine and cosine digital-to-analog converters (DACs) connected to the sequence generators receive the digital sequence values for each submoduli and/or factored submoduli m1-mn and produce sequences of corresponding analog sine and cosine signals. An analog processor including adders and multipliers connected to the DACs combines the sine and cosine signals to produce the chirp waveform. The argument (t2 modulus m) is an implemented phase argument that approximates a desired phase argument (πrt2). Programmable inputs on the sequence generators enable control over waveform parameters including starting phase, ramp rate and frequency.
摘要翻译： 啁啾波形发生器，用于产生啁啾波形f（t）= sin（t2模数m），其中模数m由n个子模和/或因子子模m1-mn表示。 序列生成器生成代表每个子模和/或因子子模m1-mn的二次残差序列的数字序列值。 连接到序列发生器的正弦和余弦数模转换器（DAC）接收每个子模和/或因子子模m1-mn的数字序列值，并产生对应的模拟正弦和余弦信号的序列。 包括连接到DAC的加法器和乘法器的模拟处理器组合正弦和余弦信号以产生啁啾波形。 参数（t2模数m）是逼近期望相位参数（pirt2）的实现的相位参数。 序列发生器上的可编程输入可以控制波形参数，包括起始相位，斜坡率和频率。
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公开(公告)号：US20080262320A1
公开(公告)日：2008-10-23
申请号：US11993735
申请日：2006-06-28
申请人： Timothy M. Schaefer , Daivd R. Holmes , Jonathan D. Coker , Edward B. Welch , Barry K. Gilbert , Kenton R. Kaufman
发明人： Timothy M. Schaefer , Daivd R. Holmes , Jonathan D. Coker , Edward B. Welch , Barry K. Gilbert , Kenton R. Kaufman
IPC分类号： A61B5/00
CPC分类号： A61B5/073 , A61B1/00016 , A61B1/00036 , A61B1/041 , A61B5/0008 , A61B5/0031 , A61B5/01 , A61B5/036 , A61B5/14539
摘要： A system for monitoring a physical parameter of a subject includes a sensor, a transmitter, a repeater, and a base station. The sensor is located within the body of the subject and is operable to sense a physical parameter of the subject. The transmitter is electrically connected to the sensor, and is operable to transmit a spread spectrum encoded signal using a digital spreading code, the encoded signal carrying information indicative of the sensed physical parameter and being transmitted to a local region outside the body. The repeater is located in the local region, is movable with the subject, and is operable to receive the transmitted encoded signal and retransmit it to a remote region outside the body. The base station is located in the remote region and is operable to receive and decode the retransmitted encoded signal.
摘要翻译： 用于监测对象的物理参数的系统包括传感器，发射器，中继器和基站。 传感器位于受试者的身体内，并且可操作以感测受试者的物理参数。 发射器电连接到传感器，并且可操作以使用数字扩展码来发送扩频编码信号，所述编码信号承载指示感测到的物理参数的信息并将其发送到身体外部的局部区域。 中继器位于局部区域中，可与主体一起移动，并且可操作以接收发送的编码信号并将其重发到身体外部的远程区域。 基站位于远程区域中，可操作以接收和解码重传的编码信号。
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5.发明授权公开(公告)号：US06625235B1
公开(公告)日：2003-09-23
申请号：US09403628
申请日：1999-11-02
IPC分类号： H03D100
CPC分类号： G11B20/10175 , G11B20/10009
摘要： In a maximum likelihood sequence detector for symbol sequences which were equalized in a PR4 equalizer, noise prediction means (35) are provided including infinite impulse response (IIR) filtering, which have noise-whitening capabilities and are imbedded into the maximum likelihood detection process. The resulting INPML detector (10) can be implemented in digital or analog circuit technology. In addition, a DC-notch filter (44a) and a stochastic gradient procedure can be provided for DC offset compensation and for MR head or signal asymmetry compensation.
摘要翻译： 在PR4均衡器中均衡的符号序列的最大似然序列检测器中，提供具有无限脉冲响应（IIR）滤波的噪声预测装置（35），其具有噪声增白能力并被嵌入到最大似然检测过程中。 所得到的INPML检测器（10）可以以数字或模拟电路技术实现。 此外，可以提供DC陷波滤波器（44a）和随机梯度程序用于DC偏移补偿和用于MR头或信号不对称补偿。
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公开(公告)号：US09001450B2
公开(公告)日：2015-04-07
申请号：US13529309
申请日：2012-06-21
IPC分类号： G11B5/596
CPC分类号： G11B5/59627 , G11B20/10009 , G11B20/10527
摘要： A method of correcting repeatable run out (RRO) errors for a HDD in which RRO data is instead stored in consolidated form within the reserved area of the disk, instead of storing RRO data in the servo patterns for each HDD track or sector. RRO data is preferably stored in the reserved area of a hard disk drive in compressed form. The compressed RRO data is subsequently read into DRAM in compressed form and then decompressed for use. Predictive techniques determine what compressed RRO data is needed for upcoming read/write operations.
摘要翻译： 一种用于校正HDD的可重复耗尽（RRO）错误的方法，其中RRO数据以固定形式存储在盘的保留区域内，而不是将RRO数据存储在每个HDD轨道或扇区的伺服模式中。 RRO数据优选地以压缩形式存储在硬盘驱动器的保留区域中。 压缩的RRO数据随后以压缩形式读入DRAM，然后解压缩使用。 预测技术确定即将到来的读/写操作需要什么压缩的RRO数据。
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公开(公告)号：US06222879B1
公开(公告)日：2001-04-24
申请号：US09144165
申请日：1998-08-31
申请人： Roy D. Cideciyan , Jonathan D. Coker , Evangelos S. Eleftheriou , Richard L. Galbraith , John J. Stephenson
发明人： Roy D. Cideciyan , Jonathan D. Coker , Evangelos S. Eleftheriou , Richard L. Galbraith , John J. Stephenson
IPC分类号： H04B1500
CPC分类号： H04L25/03038 , G11B20/10009 , G11B20/10037 , G11B20/10055 , H04L2025/03477 , H04L2025/03617
摘要： A method and apparatus for automating the convergence of tap weights in an equalizer for a data channel is disclosed. The automated equalization method is contained within the channel and obtains a temporary copy of each of a plurality of current tap weights from a current tap weight memory, determines a direction for modifying the temporary copy of each of the plurality of current tap weights, constrains the modifications to the temporary copy of each of the plurality of current tap weights to produce adjusted tap weights and at the end of a read operation, stores the adjusted tap weights to the current tap weight memory for use during a next read operation. The sign—sign LMS products for each of the plurality of current tap weights is calculated, the sign—sign LMS products for each of the plurality of current tap weights is summed to produce a count and the count for each of the plurality of current tap weights is compared to a threshold produce a desired tap direction indicator for each of the plurality of current tap weights. The desired tap direction comprises a positive value if the count is more positive than the threshold and a negative value is if the count is more negative than the threshold. The summing further includes incrementing the count by +1 if the sign product is positive and by −1 if the sign product is negative. The constraining further includes moving odd/even taps in pairs having opposite signs so that the sum of the odd/even taps is unchanged.
摘要翻译： 公开了一种用于使用于数据信道的均衡器中的抽头权重的收敛自动化的方法和装置。 自动均衡方法包含在信道内，并从当前抽头权重存储器中获得多个当前抽头权重中的每一个的临时副本，确定用于修改多个当前抽头权重中的每一个的临时拷贝的方向，约束 对多个当前抽头权重中的每一个的临时拷贝的修改以产生调整的抽头权重，并且在读取操作结束时，将调整的抽头权重存储到当前抽头权重存储器中以在下一次读取操作期间使用。 计算多个当前抽头权重中的每一个的符号LMS乘积，将用于多个当前抽头权重中的每一个的符号LMS乘积相加以产生计数，并且对于多个当前抽头中的每个当前抽头 将权重与阈值进行比较，为多个当前抽头权重中的每一个生成期望的抽头方向指示符。 如果计数比阈值更正，则期望的抽头方向包括正值，并且如果计数比阈值更负的则为负值。 如果符号积为正，则求和进一步包括将+1加1，如果符号乘积为负。 约束还包括成对地移动具有相反符号的奇数/偶数抽头，使得奇数/偶数抽头的总和不变。
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公开(公告)号：US5416806A
公开(公告)日：1995-05-16
申请号：US898636
申请日：1992-06-15
CPC分类号： G11B20/10055 , G11B20/1403 , G11B5/012 , H04L7/0334 , H04L7/10 , H04L7/04
摘要： Timing loop apparatus and method 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) providing samples to a digital filter during a tracking mode and to a gain and timing control during an acquisition mode. Sample values from the ADC are received at peaks and zeros on sync field pattern. An error absolute value is calculated from the received ADC sample values and an error sign of the calculated error absolute valve calculated using a most significant bit of the current and a previous sample. Timing correction values are calculated responsive to the calculated error absolute value and applied to a clock gated register that latches and holds the generated timing correction values for a predefined number of clock cycles.
摘要翻译： 提供了用于部分响应最大似然（PRML）数据信道中的数据检测的定时循环装置和方法。 PRML数据通道包括在跟踪模式期间向数字滤波器提供采样的模数转换器（ADC）以及在采集模式期间的增益和定时控制。 来自ADC的采样值在同步字段模式的峰值和零点被接收。 从接收到的ADC采样值和使用当前和先前样本的最高有效位计算的计算误差绝对值的误差符号计算误差绝对值。 响应于所计算的误差绝对值计算定时校正值，并将其施加到时钟门控寄存器，该时钟选通寄存器锁存和保持产生的定时校正值达预定数量的时钟周期。
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9.发明授权Asynchronous servo identification/address mark detection for PRML disk drive ssytem 失效PRML磁盘驱动器系统的异步伺服识别/地址标记检测
公开(公告)号：US5255131A
公开(公告)日：1993-10-19
申请号：US929059
申请日：1992-08-13
CPC分类号： G11B20/10055 , G11B20/10009 , G11B27/3027
摘要： Apparatus and method for asynchronous servo identification (SID)/address mark detection are provided for data detection in a partial-response maximum-likelihood (PRML) data channel. The SID/AM pattern includes a first preamble section defined by a plurality of short magnets; a body section defined by a predetermined number of long magnets; and a delimiter section defined by a plurality of short magnets. Samples from the digital filter are applied to first and second correlation filtering paths. The first correlation filtering path includes a polarity threshold function to indicate one of a preamble section or a delimiter section of a SID/AM pattern. The second correlation filtering paths includes a second threshold function and a comparator for sequentially comparing sequential ones of the received samples responsive to identifying the second threshold value to identify a predefined sequence. A count value is incremented responsive to each the identified predefined sequence to indicate a body section of the SID/AM pattern.
摘要翻译： 提供用于异步伺服识别（SID）/地址标记检测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。 SID / AM模式包括由多个短磁体限定的第一前导码部分; 由预定数量的长磁体限定的主体部分; 以及由多个短磁体限定的分隔部。 来自数字滤波器的样本被应用于第一和第二相关滤波路径。 第一相关滤波路径包括用于指示SID / AM模式的前导码部分或分隔符部分之一的极性阈值函数。 第二相关滤波路径包括第二阈值函数和比较器，用于响应于识别第二阈值来顺序地比较接收到的样本中的顺序样本，以识别预定义的序列。 计数值响应于每个所识别的预定义序列递增，以指示SID / AM模式的身体部分。
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10.发明授权Self-equalization method for partial-response maximum-likelihood disk drive systems 失效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
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。
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