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1. 发明授权

US5786951A Sampled amplitude read channel employing a discrete time noise generator for calibration 失效
标题翻译：采用离散时间噪声发生器进行校准的采样幅度读取通道
公开(公告)号：US5786951A
公开(公告)日：1998-07-28
申请号：US658763
申请日：1996-06-05
申请人： David R. Welland , Richard T. Behrens , Iuri Mehr
发明人： David R. Welland , Richard T. Behrens , Iuri Mehr
IPC分类号： G11B5/09 , G11B20/10 , G11B5/035
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/10037 , G11B5/09
摘要： This invention provides apparatus and a method to assist in calibrating a read channel in a magnetic data storage system. More particularly, the invention provides a read channel including a digital noise generator. During a calibration procedure, the digital noise generator injects an analog noise signal into the read channel, thereby increasing the read channel's bit-error rate, and consequently allowing rapid calibration of the read channel. The digital noise generator comprises a number of linear feedback shift registers that together generate a pseudo-random digital word sequence, and a digital-to-analog converter that converts the pseudo-random digital word sequence into the analog noise signal. The digital-to-analog converter comprises a plurality of one-bit digital-to-analog converters whose outputs are summed by an analog adder. This configuration causes the analog noise signal to exhibit a binomial probability distribution which is close to a normal probability distribution for a sufficiently large number of linear feedback shift registers. The linear feedback shift registers are driven by a clock that operates at a higher frequency than the rate at which data is processed in the read channel. The analog noise signal, therefore, has bandwidth that is wider than that of the data, thereby insuring that calibration of the read channel includes effects due to aliasing. The digital noise generator is disabled while the read head passes over synchronization marks and embedded servo wedges.
摘要翻译：本发明提供了一种辅助校准磁数据存储系统中的读通道的装置和方法。更具体地，本发明提供了一种包括数字噪声发生器的读通道。在校准过程中，数字噪声发生器将模拟噪声信号注入读通道，从而增加读通道的误码率，从而允许读通道的快速校准。数字噪声发生器包括一起产生伪随机数字字序列的多个线性反馈移位寄存器，以及将伪随机数字字序列转换为模拟噪声信号的数 - 模转换器。数模转换器包括多个1位数模转换器，其输出由模拟加法器相加。该配置使得模拟噪声信号呈现二进制概率分布，其接近足够大数量的线性反馈移位寄存器的正态概率分布。线性反馈移位寄存器由在读通道中处理数据的频率更高的时钟运行的时钟驱动。因此，模拟噪声信号具有比数据宽的带宽，从而确保读通道的校准包括由于混叠引起的影响。读取头通过同步标记和嵌入式伺服楔时，数字噪声发生器被禁用。

2. 发明授权

US06993314B2 Apparatus for generating multiple radio frequencies in communication circuitry and associated methods 有权
公开(公告)号：US06993314B2
公开(公告)日：2006-01-31
申请号：US10074591
申请日：2002-02-13
申请人： Lysander Lim , Caiyi Wang , David R. Welland , Donald A. Kerth , Richard T. Behrens , Jeffrey W. Scott , G. Diwakar Vishakhadatta , G. Tyson Tuttle , Vishnu S. Srinivasan
发明人： Lysander Lim , Caiyi Wang , David R. Welland , Donald A. Kerth , Richard T. Behrens , Jeffrey W. Scott , G. Diwakar Vishakhadatta , G. Tyson Tuttle , Vishnu S. Srinivasan
IPC分类号： H04N1/28
CPC分类号： H04B1/0003 , H03L7/085 , H03L7/087 , H03L7/091 , H03L7/099 , H03L7/187 , H03L7/199 , H03L7/23 , H04B1/28 , H04B1/406 , H04B15/02 , H04B15/04 , H04B2215/064
摘要： A radio-frequency (RF) apparatus capable of transmitting RF signals includes transmitter path circuitry. The transmitter path circuitry includes a voltage-controlled oscillator (VCO) circuitry. The VCO circuitry generates a first signal that has a first frequency. A divider circuitry couples to the VCO circuitry and, in response to the first signal, the divider circuitry generates a second signal that has a second frequency. The frequency of the second signal equals the frequency of the first signal divided by a number.

3. 发明授权

US6108151A Sampled amplitude read channel for reading user data and embedded servo data from a magnetic medium 失效
标题翻译：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。

4. 发明授权

US5991107A Sychronous read channel 失效
标题翻译：同步读通道
公开(公告)号：US5991107A
公开(公告)日：1999-11-23
申请号：US822173
申请日：1997-03-21
申请人： Richard T. Behrens , Trent O. Dudley , Neal Glover , David R. Welland
发明人： Richard T. Behrens , Trent O. Dudley , Neal Glover , David R. Welland
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。

5. 发明授权

US5917668A Synchronous read channel employing a frequency synthesizer for locking a timing recovery phase-lock loop to a reference frequency 失效
标题翻译：采用频率合成器的同步读通道，用于将定时恢复锁相环锁定到参考频率
公开(公告)号：US5917668A
公开(公告)日：1999-06-29
申请号：US822174
申请日：1997-03-21
申请人： Richard T. Behrens , Trent Dudley , Neal Glover , David R. Welland
发明人： Richard T. Behrens , Trent Dudley , Neal Glover , David R. Welland
IPC分类号： G11B5/012 , G11B5/09 , G11B20/10 , G11B20/12 , G11B20/14 , G11B20/18 , G11B27/30 , H03M13/31
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, filters the sample values according to a desired partial response, extracts timing information from the filtered sample values, and detects an estimated data sequence from the filtered sample values using a discrete time sequence detector. To ensure a small frequency error when timing recovery acquisition mode is entered, the timing recovery phase-lock loop (PLL) is first locked to a nominal read frequency which is the same as the write frequency. This is accomplished by multiplexing the output of the write frequency synthesizer into the timing recovery PLL in a lock-to-reference mode. Thereafter, the analog signal from the read head is multiplexed into the timing recovery PLL in order to acquire the actual frequency and phase of an acquisition preamble recorded prior to the user data.
摘要翻译：公开了一种同步读通道，其从位于磁盘介质上的磁读头读取模拟读信号，根据所需的部分响应对采样值进行滤波，从滤波后的采样值中提取定时信息，并检测估计数据序列使用离散时间序列检测器从滤波后的样本值。为了在进入定时恢复采集模式时确保小的频率误差，定时恢复锁相环（PLL）首先被锁定到与写入频率相同的标称读取频率。这是通过将写入频率合成器的输出以锁定参考模式复用到定时恢复PLL来实现的。此后，来自读取头的模拟信号被多路复用到定时恢复PLL中，以便获取在用户数据之前记录的获取前导码的实际频率和相位。

6. 发明授权

US06646822B1 Sampled amplitude read channel employing pipelined reads to reduce the gap between sectors 失效
标题翻译：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。

7. 发明授权

US07092675B2 Apparatus and methods for generating radio frequencies in communication circuitry using multiple control signals 有权
标题翻译：在使用多个控制信号的通信电路中产生无线电频率的设备和方法
公开(公告)号：US07092675B2
公开(公告)日：2006-08-15
申请号：US10075098
申请日：2002-02-13
申请人： Lysander Lim , Caiyi Wang , David R. Welland , Donald A. Kerth , Richard T. Behrens , Jeffrey W. Scott , G. Diwakar Vishakhadatta , G. Tyson Tuttle , Vishnu S. Srinivasan
发明人： Lysander Lim , Caiyi Wang , David R. Welland , Donald A. Kerth , Richard T. Behrens , Jeffrey W. Scott , G. Diwakar Vishakhadatta , G. Tyson Tuttle , Vishnu S. Srinivasan
IPC分类号： H04B1/40
CPC分类号： H03L7/085 , H03L7/087 , H03L7/091 , H03L7/099 , H03L7/187 , H03L7/199 , H03L7/23 , H04B1/0003 , H04B1/28 , H04B1/406 , H04B15/02 , H04B15/04 , H04B2215/064
摘要： A radio-frequency (RF) apparatus capable of transmitting RF signals includes transmitter path circuitry. The transmitter path circuitry includes a voltage-controlled oscillator (VCO) that generates an output signal. The frequency of the output signal of the VCO circuitry is adjustable in response to a first control signal and a second control signal. The transmitter path circuitry also includes a first feedback circuitry and a second feedback circuitry that are responsive to the output signal of the VCO circuitry. The first feedback circuitry provides the first control signal to the VCO circuitry. The first control signal coarsely adjusts the frequency of the output signal of the VCO circuitry to a desired frequency. The second feedback circuitry supplies the second control signal to the VCO circuitry. The second control signal fine tunes the frequency of the output signal of the voltage-controlled oscillator circuitry to the desired frequency.
摘要翻译：能够发送RF信号的射频（RF）装置包括发射机路径电路。发射机路径电路包括产生输出信号的压控振荡器（VCO）。 VCO电路的输出信号的频率可响应于第一控制信号和第二控制信号而调节。发射机路径电路还包括响应于VCO电路的输出信号的第一反馈电路和第二反馈电路。第一反馈电路向VCO电路提供第一控制信号。第一控制信号粗略地将VCO电路的输出信号的频率调整到期望的频率。第二反馈电路将第二控制信号提供给VCO电路。第二控制信号将压控振荡器电路的输出信号的频率调谐到期望的频率。

8. 发明授权

US5796535A Sampled amplitude read channel employing a user data frequency synthesizer and a servo data frequency synthesizer 失效
标题翻译：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。

9. 发明授权

US5892632A Sampled amplitude read channel employing a residue number system FIR filter in an adaptive equalizer and in interpolated timing recovery 失效
标题翻译：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
申请人： Richard T. Behrens , David R. Welland , Trent O. Dudley , Mark S. Spurbeck
发明人： Richard T. Behrens , David R. Welland , Trent O. Dudley , Mark S. Spurbeck
IPC分类号： G11B5/012 , G11B5/09 , G11B20/10 , G11B20/14 , H03H17/02 , H04L7/02 , H04L7/04
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。

10. 发明授权

US5359631A Timing recovery circuit for synchronous waveform sampling 失效
标题翻译：同步波形采样定时恢复电路
公开(公告)号：US5359631A
公开(公告)日：1994-10-25
申请号：US954350
申请日：1992-09-30
申请人： Richard T. Behrens , Trent Dudley , Neal Glover , David R. Welland
发明人： Richard T. Behrens , Trent Dudley , Neal Glover , David R. Welland
IPC分类号： G11B20/10 , G11B20/14 , H03D13/00 , H03L7/00 , H03L7/085 , H03L7/091 , H04L7/02 , H04L7/033 , H04L7/04 , H04L7/10 , H03D3/24
CPC分类号： G11B20/10037 , G11B20/1403 , H03D13/005 , H03L7/091 , H04L7/0334 , H04L7/04 , H04L7/046 , H04L7/10
摘要： A timing circuit having an analog to digital converter to sample an analog signal, a controlled oscillator for controlling sample times of the analog to digital converter, a circuit to detect pulses in the analog signal, a phase error circuit to subtract one of two samples from the other to create a phase error measurement and a frequency error circuit to add two samples together to create a frequency error measurement. The two samples are taken from either side of a pulse. The phase error measurement is used by the controlled oscillator to adjust the sample timing to take samples at desired locations on the pulse. The circuit also contains constant values used to compensate for the pulse being asymmetrical and to compensate for other pulses that occur close to the detected pulse. The circuit also inserts a known frequency in place of the analog signal to establish a frequency of the controlled oscillator.
摘要翻译：具有模拟数字转换器以对模拟信号进行采样的定时电路，用于控制模数转换器的采样时间的受控振荡器，用于检测模拟信号中的脉冲的电路，相位误差电路，以从另一个创建相位误差测量和频率误差电路，将两个样本相加在一起以创建频率误差测量。两个样本取自脉冲的任一侧。相位误差测量由受控振荡器用于调整采样定时以在脉冲的所需位置采样。电路还包含用于补偿不对称脉冲的常数值，并补偿靠近检测到的脉冲发生的其他脉冲。电路还插入已知频率代替模拟信号以建立受控振荡器的频率。

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