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公开(公告)号：US5583706A
公开(公告)日：1996-12-10
申请号：US341723
申请日：1994-11-17
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/10037 , G11B20/1403 , G11B19/04
摘要： In a sampled amplitude read channel for magnetic recording, a nonlinear discrete time decimation filter in a negative feed back loop adjusts a DC offset in an analog read signal from a magnetic read head without distorting the read signal. In sampled amplitude recording, adding the samples of an isolated positive pulse to the samples of an isolated negative pulse generates the DC offset of the discrete time sample values. A decimation filter adds the sample values from a positive pulse to the sample values of a negative pulse in order to detect and pass the DC offset in the read signal. The detected discrete time DC offset from the discrete time decimation filter is converted into an analog DC offset signal and subtracted from the analog read signal in a negative feedback loop. A running average decimation filter removes the DC offset during acquisition, and a decision-directed decimation filter removes the DC offset during tracking.
摘要翻译： 在用于磁记录的采样幅度读取通道中，负反馈回路中的非线性离散时间抽取滤波器调整来自磁读头的模拟读取信号中的DC偏移，而不会使读取信号失真。 在采样振幅记录中，将隔离的正脉冲的样本加到分离的负脉冲的采样中，产生离散时间采样值的直流偏移。 抽取滤波器将来自正脉冲的采样值与负脉冲的采样值相加，以便检测并通过读信号中的直流偏移。 从离散时间抽取滤波器检测到的离散时间直流偏移被转换为模拟直流偏移信号，并从负反馈回路中的模拟读取信号中减去。 运行平均抽取滤波器在采集期间去除DC偏移，并且决策导频抽取滤波器在跟踪期间去除DC偏移。
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2.发明授权Sampled amplitude read channel employing pipelined reads to reduce the gap between sectors 失效取样幅度读通道采用流水线读数，以减少扇区之间的差距公开(公告)号：US06646822B1
公开(公告)日：2003-11-11
申请号：US08815894
申请日：1997-03-12
申请人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
发明人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
IPC分类号： G11B509
CPC分类号： G11B20/10055 , G11B5/012 , G11B5/09 , G11B5/5526 , G11B5/553 , G11B5/5534 , G11B5/5547 , G11B5/58 , G11B5/59605 , G11B5/59622 , G11B5/59633 , G11B5/5965 , G11B5/59688 , G11B19/28 , G11B20/10009 , G11B20/10037 , G11B20/1258 , G11B20/1403
摘要： A sampled amplitude read channel incorporated within a magnetic disk storage system for reading data recorded tracks on a magnetic medium, where the data comprises user data sectors recorded at varying data rates across a plurality of predefined zones and embedded servo data sectors recorded at the same data rate across the zones. The read channel comprises a timing recovery component for synchronous sampling of a read signal from a magnetic read head positioned over the magnetic medium, a gain control component for adjusting the amplitude of the read signal, and a DC offset component for canceling a DC offset in the read signal. These components are dynamically configured to operate according to whether the read channel is processing user data or embedded servo data.
摘要翻译： 包含在磁盘存储系统内的采样幅度读取通道，用于读取在磁性介质上记录的轨道上的数据，其中数据包括以相同数据记录的多个预定义区域和嵌入式伺服数据扇区以变化的数据速率记录的用户数据扇区 率跨越区域。 读取通道包括用于对位于磁介质上的磁读头的读信号进行同步采样的定时恢复组件，用于调整读信号幅度的增益控制部件和用于消除读信号的DC偏移的DC偏移分量 读信号。 这些组件被动态配置为根据读通道是处理用户数据还是嵌入式伺服数据进行操作。
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3.发明授权Sampled amplitude read channel for reading user data and embedded servo data from a magnetic medium 失效采样幅度读通道，用于从磁介质读取用户数据和嵌入式伺服数据
公开(公告)号：US6108151A
公开(公告)日：2000-08-22
申请号：US846140
申请日：1997-04-25
申请人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
发明人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
IPC分类号： G11B5/012 , G11B5/09 , G11B5/55 , G11B5/58 , G11B5/596 , G11B19/28 , G11B20/10 , G11B20/12 , G11B20/14 , G11B15/12 , G11B21/02
CPC分类号： G11B20/10055 , G11B19/28 , G11B20/10009 , G11B20/10037 , G11B20/1403 , G11B5/012 , G11B5/09 , G11B5/5526 , G11B5/553 , G11B5/5547 , G11B5/58 , G11B5/59605 , G11B5/59622 , G11B5/59633 , G11B5/59688 , G11B20/1258 , G11B5/5534 , G11B5/5965
摘要： A sampled amplitude read channel is disclosed for reading data recorded on a disk storage medium by detecting an estimated binary sequence from a sequence of discrete time sample values generated by sampling pulses in an analog read signal from a read head positioned over the disk storage medium. The read channel comprises a sampling device, such as an analog-to-digital converter (A/D), for sampling the analog read signal to generate the discrete time sample values and for sampling at least one other auxillary analog input signal, such as a servo control signal. In this manner, performance characteristics of the read channel can be measured, such as the driving current applied to the servo control voice coil motor (VCM), without requiring additional hardware.
摘要翻译： 公开了一种采样幅度读取通道，用于通过从位于盘存储介质上的读取头的模拟读取信号中通过采样脉冲产生的离散时间采样值序列检测估计的二进制序列来读取记录在盘存储介质上的数据。 读取通道包括采样装置，例如模拟 - 数字转换器（A / D），用于对模拟读取信号进行采样以产生离散时间采样值，并用于对至少一个其他辅助模拟输入信号进行采样，例如 伺服控制信号。 以这种方式，可以测量读取通道的性能特性，例如施加到伺服控制音圈电机（VCM）的驱动电流，而不需要额外的硬件。
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公开(公告)号：US5991107A
公开(公告)日：1999-11-23
申请号：US822173
申请日：1997-03-21
IPC分类号： G11B5/012 , G11B5/09 , G11B20/10 , G11B20/12 , G11B20/14 , G11B20/18 , G11B27/30 , H03M13/31 , G11B5/035
CPC分类号： G11B20/10055 , G11B20/10 , G11B20/10009 , G11B20/1403 , G11B20/1426 , G11B20/18 , G11B27/3027 , G11B5/012 , G11B5/09 , H03M13/31 , G11B20/1258 , G11B2020/1476
摘要： A synchronous read channel is disclosed which samples an analog read signal from a magnetic read head positioned over a magnetic disk medium, computes a DC offset in the sample values in real time, and subtracts the DC offset from the read signal. This attenuates the deleterious affect a DC offset has on the detection algorithm used to detect the recorded data, such as the Viterbi detection algorithm.
摘要翻译： 公开了一种同步读取通道，其从位于磁盘介质上的磁读头读取模拟读取信号，实时计算样本值中的DC偏移量，并从读取信号中减去DC偏移。 这减弱了DC偏移对用于检测记录数据的检测算法（如维特比检测算法）的有害影响。
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5.发明授权Sampled amplitude read channel employing a residue number system FIR filter in an adaptive equalizer and in interpolated timing recovery 失效采样幅度读取通道采用自适应均衡器中的残差数系统FIR滤波器和内插定时恢复
公开(公告)号：US5892632A
公开(公告)日：1999-04-06
申请号：US751883
申请日：1996-11-18
CPC分类号： G11B20/1403 , G11B20/10009 , G11B20/10037 , G11B20/10055 , G11B5/09 , G11B5/012 , H03H17/0242 , H04L2007/047 , H04L7/0029
摘要： A sampled amplitude read channel is disclosed for disk storage systems which asynchronously samples an analog read signal, adaptively equalizes the resulting discrete time sample values according to a target partial response, extracts synchronous sample values through interpolated timing recovery, and detects digital data from the synchronous sample values using a Viterbi sequence detector. To increase the speed of the read channel, the FIR filters in the equalizer and interpolator are implemented according to a residue number system. Further, the residue number system implementation of the FIR filters uses "one-hot" encoding to decrease power dissipation.
摘要翻译： 公开了一种用于磁盘存储系统的采样幅度读取通道，其异步采样模拟读取信号，根据目标部分响应对所得到的离散时间采样值进行自适应均衡，通过内插定时恢复提取同步采样值，并从同步信号中检测数字数据 使用维特比序列检测器的采样值。 为了提高读取通道的速度，均衡器和内插器中的FIR滤波器根据残差编号系统来实现。 此外，FIR滤波器的残留数系统实现使用“一热”编码来降低功耗。
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6.发明授权Sampled amplitude read channel employing a user data frequency synthesizer and a servo data frequency synthesizer 失效采用用户数据频率合成器和伺服数据频率合成器的采样幅度读取通道
公开(公告)号：US5796535A
公开(公告)日：1998-08-18
申请号：US440515
申请日：1995-05-12
申请人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
发明人： Tyson Tuttle , Diwakar Vishakhadatta , Jerrel P. Hein , David R. Welland , David E. Reed , Richard T. Behrens , William G. Bliss , Paul M. Romano , Trent O. Dudley , Christopher P. Zook
IPC分类号： G11B5/012 , G11B5/09 , G11B5/55 , G11B5/58 , G11B5/596 , G11B19/28 , G11B20/10 , G11B20/12 , G11B20/14
CPC分类号： G11B20/10055 , G11B19/28 , G11B20/10009 , G11B20/10037 , G11B20/1403 , G11B5/012 , G11B5/09 , G11B5/5526 , G11B5/553 , G11B5/5547 , G11B5/58 , G11B5/59605 , G11B5/59622 , G11B5/59633 , G11B5/59688 , G11B20/1258 , G11B5/5534 , G11B5/5965
摘要： A sampled amplitude read channel incorporated within a magnetic disk storage system for reading data recorded in concentric tracks on a magnetic medium, where the data comprises user data sectors recorded at varying data rates across a plurality of predefined zones and embedded servo data sectors recorded at the same data rate across the zones. The sampled amplitude read channel comprises a timing recovery component for synchronous sampling of a read signal from a magnetic read head positioned over the magnetic medium, a gain control component for adjusting the amplitude of the read signal, and a DC offset component for cancelling a DC offset in the read signal. These components are dynamically configured to operate according to whether the read channel is processing user data or embedded servo data. A user data frequency synthesizer and a servo data frequency synthesizer lock the timing recovery component to a reference frequency and provide a coarse center frequency control signal corresponding to the user data or servo data mode. The read channel further employs pipelined reads to reduce the physical gap between sectors on the medium. In addition, an improved sync mark detector and an improved asynchronous servo address mark detector increase the accuracy and reliability of the read channel.
摘要翻译： 一个结合在磁盘存储系统内的采样幅度读取通道，用于读取记录在磁介质上的同心磁道中的数据，其中数据包括以多个预定义区域中记录的不同数据速率记录的用户数据扇区，以及记录在 相同的数据速率跨区域。 采样振幅读通道包括定时恢复组件，用于对位于磁介质上的磁读头进行读信号的同步采样，用于调整读信号振幅的增益控制部件和用于消除DC的直流偏移分量 在读信号中偏移。 这些组件被动态配置为根据读通道是处理用户数据还是嵌入式伺服数据进行操作。 用户数据频率合成器和伺服数据频率合成器将定时恢复组件锁定到参考频率，并提供对应于用户数据或伺服数据模式的粗略的中心频率控制信号。 读通道还采用流水线读取来减少介质上扇区之间的物理差距。 此外，改进的同步标记检测器和改进的异步伺服地址标记检测器增加读取通道的精度和可靠性。
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公开(公告)号：US09095041B2
公开(公告)日：2015-07-28
申请号：US11930804
申请日：2007-10-31
申请人： David R. Welland , Donald A. Kerth , Caiyi Wang
发明人： David R. Welland , Donald A. Kerth , Caiyi Wang
CPC分类号： H05K9/00 , H03L7/18 , H05K1/0216 , H05K3/10 , Y10T29/49124
摘要： A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a combination of one or more techniques which reduce the digital current, minimize mutual inductance, utilize field cancellation, prevent leakage current, and/or manage impedance. These techniques may be used alone, or preferably, used on combination with one another.
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8.发明申请APPARATUS FOR CAPACITANCE SENSOR WITH INTERFERENCE REJECTION AND ASSOCIATED METHODS 审中-公开具有干扰抑制和相关方法的电容传感器装置公开(公告)号：US20120169659A1
公开(公告)日：2012-07-05
申请号：US13335407
申请日：2011-12-22
申请人： David R. Welland
发明人： David R. Welland
IPC分类号： G06F3/045
CPC分类号： G06F3/044 , G06F3/0416
摘要： A method for interfacing with a capacitive touch screen is disclosed. The method includes charging an internal capacitor in the touch screen, which internal capacitor is disposed proximate a fixed location on the touch screen and is capable of changing in response to a touch at that location on the touch screen. After charging, value of the charge on the internal capacitor is determined in a manner to reduce effects of interference.
摘要翻译： 公开了一种用于与电容式触摸屏接口的方法。 该方法包括对触摸屏中的内部电容器进行充电，该内部电容器设置在触摸屏上的固定位置附近，并且能够响应于触摸屏上该位置处的触摸而改变。 充电后，以减少干扰影响的方式确定内部电容器的电荷值。
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公开(公告)号：US08154336B2
公开(公告)日：2012-04-10
申请号：US11930596
申请日：2007-10-31
申请人： David R. Welland , Donald A. Kerth , Caiyi Wang
发明人： David R. Welland , Donald A. Kerth , Caiyi Wang
IPC分类号： H03K5/00
CPC分类号： H05K9/00 , H03L7/18 , H05K1/0216 , H05K3/10 , Y10T29/49124
摘要： A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a combination of one or more techniques which reduce the digital current, minimize mutual inductance, utilize field cancellation, prevent leakage current, and/or manage impedance. These techniques may be used alone, or preferably, used on combination with one another.
摘要翻译： 提供一种减少电路干扰的方法和装置。 提供管理策略，以减少参考杂散和电路干扰。 管理策略使用一种或多种减少数字电流，最小化互感，利用场消除，防止泄漏电流和/或管理阻抗的技术的组合。 这些技术可以单独使用，或者优选地彼此组合使用。
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公开(公告)号：US20100102876A1
公开(公告)日：2010-04-29
申请号：US12650545
申请日：2009-12-31
申请人： David R. Welland , Donald A. Kerth , Caiyi Wang
发明人： David R. Welland , Donald A. Kerth , Caiyi Wang
IPC分类号： H03B1/04
CPC分类号： H05K9/00 , H03L7/18 , H05K1/0216 , H05K3/10 , Y10T29/49124
摘要： A method and apparatus is provided for reducing interference in circuits. A management strategy is provided to reduce reference spurs and interference in circuits. The management strategy uses a combination of one or more techniques which reduce the digital current, minimize mutual inductance, utilize field cancellation, prevent leakage current, and/or manage impedance. These techniques may be used alone, or preferably, used on combination with one another.
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