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1. 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。

2. 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。

3. 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。

4. 发明授权

US5914922A Generating a quadrature seek signal from a discrete-time tracking error signal and a discrete-time RF data signal in an optical storage device 失效
标题翻译：在光存储装置中从离散时间跟踪误差信号和离散时间RF数据信号产生正交寻道信号
公开(公告)号：US5914922A
公开(公告)日：1999-06-22
申请号：US989272
申请日：1997-12-12
申请人： Louis Supino , Jim Graba , Shuangxia Zhu , Paul M. Romano
发明人： Louis Supino , Jim Graba , Shuangxia Zhu , Paul M. Romano
IPC分类号： G11B21/08 , G11B7/085 , G11B7/09 , G11B21/10
CPC分类号： G11B7/08541 , G11B7/0901
摘要： In an optical disk storage device wherein user data is demodulated from a light beam reflecting off data pits in tracks of an optical disk storage medium, a quadrature seek signal is generated indicative of the light beam crossing tracks of the optical disk during a seek operation. The quadrature seek signal is generated from a discrete-time tracking error signal (TES) and a discrete-time RF baseband signal. The discrete-time TES is generated according to the mode of operation, compact disk (CD) or digital video disk (DVD). In CD mode the TES is generated as the difference between E and F tracking photodiodes, and in DVD mode the TES is generated using a discrete-time differential phase detector (DPD). To generate the discrete-time RF baseband signal, the RF data signal (generated as the sum A+B+C+D of a four quadrant photodiode) is sampled at the channel rate and the RF data samples passed through a discrete-time envelope detector. The envelope detector extracts a discrete-time RF baseband signal which represents the light beam's location with respect to a track centerline. The discrete-time TES and baseband signals are synchronized and converted into binary square waves which form a quadrature seek signal (four transitions per track) for counting track crossings and for determining the radial seek direction.
摘要翻译：在从光盘存储介质的轨道中的数据凹坑反射的光束解调用户数据的光盘存储装置中，生成表示在寻道操作期间与光盘交叉的光束的正交搜索信号。正交搜索信号由离散时间跟踪误差信号（TES）和离散时间RF基带信号产生。离散时间TES根据操作模式，光盘（CD）或数字视频盘（DVD）生成。在CD模式下，TES产生为E和F跟踪光电二极管之间的差异，在DVD模式下，使用离散时间差分相位检测器（DPD）生成TES。为了产生离散时间RF基带信号，RF信号（以四象素光电二极管的和+ A + B + C + D生成）以信道速率进行采样，RF数据样本通过离散时间信封探测器。包络检测器提取表示相对于轨道中心线的光束位置的离散时间RF基带信号。离散时间TES和基带信号被同步并转换成二进制方波，其形成正交搜索信号（每个轨道四个转换），用于计数轨道交叉点和用于确定径向搜索方向。

5. 发明授权

US5825582A Sliding mode control of a disk drive actuator for positioning a read/write head over a selected track during seeking and tracking operations 失效
标题翻译：磁盘驱动器致动器的滑动模式控制，用于在寻找和跟踪操作期间将读/写头定位在所选轨道上
公开(公告)号：US5825582A
公开(公告)日：1998-10-20
申请号：US435416
申请日：1995-05-10
申请人： Louis Supino , Paul M. Romano
发明人： Louis Supino , Paul M. Romano
IPC分类号： G11B5/00 , G11B5/55 , G11B5/596
CPC分类号： G11B5/59683 , G11B5/5547 , G11B2005/0016
摘要： A sliding mode controller is disclosed for controlling the motion of a read/write head actuated by a voice coil motor over a rotating magnetic disk storage medium. The magnetic disk comprises a plurality of concentric data tracks recorded thereon wherein each data track comprises user data and servo data. The sliding mode controller operates by multiplying a head position error phase state and a head position error velocity phase state by respective switching gains to force the phase states to follow a predetermined phase state trajectory. The phase state trajectory can be defined by a single linear segment, a variable linear segment, multiple linear segments over the entire region of excursion, or optimum parabolic acceleration and deceleration segments. Switching logic, responsive to the phase states and a trajectory segment value .sigma., switches between positive and negative feedback gains to drive the phase states toward a current trajectory segment. A .sigma. processing block monitors the phase states to determine when to switch from a current trajectory segment to the next trajectory segment. The resulting servo control system is relatively inexpensive to implement in either software or hardware, and it is substantially insensitive to parametric changes and external load disturbances. Further, it does not require notch filters commonly used in conventional linear controllers to compensate for mechanical resonances.
摘要翻译：公开了一种滑动模式控制器，用于控制通过旋转磁盘存储介质由音圈电机致动的读/写头的运动。磁盘包括记录在其上的多个同心数据轨道，其中每个数据轨道包括用户数据和伺服数据。滑动模式控制器通过将头部位置误差相位状态和头部位置误差速度相位状态乘以相应的切换增益来操作，以迫使相位状态遵循预定的相位状态轨迹。相位状态轨迹可以由单个线性段，可变线性段，整个移动区域上的多个线性段或最佳抛物线加速和减速段来定义。响应于相位状态和轨迹段sigma的开关逻辑在正和负反馈增益之间切换以将相位状态驱动到当前轨迹段。西格玛处理块监视相位状态以确定何时从当前轨迹段切换到下一轨迹段。所得到的伺服控制系统在软件或硬件中实现相对便宜，并且对参数变化和外部负载扰动基本上不敏感。此外，它不需要通常用于常规线性控制器的陷波滤波器来补偿机械谐振。

6. 发明授权

US5477103A Sequence, timing and synchronization technique for servo system controller of a computer disk mass storage device 失效
标题翻译：计算机磁盘大容量存储设备的伺服系统控制器的顺序，定时和同步技术
公开(公告)号：US5477103A
公开(公告)日：1995-12-19
申请号：US72135
申请日：1993-06-04
申请人： Paul M. Romano , Larry D. King , Mike Machado , Petro Estakhri , Son Ho , Phuc Tran , Maryam Imam
发明人： Paul M. Romano , Larry D. King , Mike Machado , Petro Estakhri , Son Ho , Phuc Tran , Maryam Imam
IPC分类号： G11B19/12 , G11B19/28 , G05B19/29
CPC分类号： G11B19/28 , G11B19/12
摘要： A servo system controller for a disk drive device which includes a rotating mass storage disk incorporates a timing error determining circuit for determining rotational speed variations in the disk from information contained in a servo field recorded in a track. A timing error signal is supplied when the speed variation exceeds a threshold, thus indicating an unacceptable level of speed variation. A digital synchronizer responds to asynchronous servo data signals from the disk to establish a cell clock signal occurring about a normal frequency, a cell during which only one servo data signal will occur, and a cell data signal which occurs during the cell. The cell clock signal clocks logical operations on a synchronous basis, and servo data signals are reliably captured. A concurrence determining circuit determines the degree of concurrence between the predetermined series of cell data signals and an actual pattern of signals derived from the servo field, and recognizes the servo control information from less than complete concurrence of the derived pattern and the actual expected pattern. Normal operation is permitted even through slight inconsistences may be detected, improving data throughput while still achieving an adequate level of error tolerance.
摘要翻译：一种包括旋转大容量存储盘的磁盘驱动装置的伺服系统控制器包括一个定时误差确定电路，用于根据记录在磁道中的伺服磁场中包含的信息确定磁盘的转速变化。当速度变化超过阈值时提供定时误差信号，从而指示不可接受的速度变化水平。数字同步器响应于来自盘的异步伺服数据信号，以建立围绕正常频率发生的单元时钟信号，即仅将发生一个伺服数据信号的单元以及在单元期间发生的单元数据信号。单元时钟信号在同步的基础上对逻辑运算进行时钟运算，并可靠地捕获伺服数据信号。同步确定电路确定预定的一系列单元数据信号与从伺服磁场导出的实际信号模式之间的并发程度，并且从导出图案和实际期望图案的完全同意中识别伺服控制信息。即使可以检测到轻微的不一致，允许正常操作，提高数据吞吐量，同时仍能达到足够的容错水平。

7. 发明授权

US06236895B1 Reference estimator in a discrete-time sliding mode controller 有权
标题翻译：离散时间滑模控制器中的参考估计器
公开(公告)号：US06236895B1
公开(公告)日：2001-05-22
申请号：US09145525
申请日：1998-09-02
申请人： Paul M. Romano , Louis Supino , Christopher T. Settje
发明人： Paul M. Romano , Louis Supino , Christopher T. Settje
IPC分类号： G05B1302
CPC分类号： G05B21/02 , G05B13/0255
摘要： A discrete-time sliding mode controller (SMC) controls the motion of mechanical apparatus such as a read head in a disk storage system. The overall control effort is generated by combining a linear control effort with a discrete-time sliding mode control effort generated by switching between gains in order to drive the system's phase states toward a sliding line trajectory. An estimate of a reference is generated and added to the control effort, thereby providing an approximation of the derivative of the reference signal. Estimating the reference signal may be performed by various methods, depending on whether the reference is known, unknown but repeatable, or completely unknown and non-repeatable. A least-mean-square (LMS) algorithm is employed to estimate the reference signal by computing coefficients of a function which minimizes a particular system parameter. If the reference is an unknown, repeatable sinusoid, such as the runout signal in a disk storage device, the coefficients of a synthesized sinusoid may be determined by minimizing the position error phase state. Alternatively, the coefficients of the synthesized sinusoid may be determined by minimizing the sliding mode variable &sgr;k which defines the position of the system phase states relative to the sliding line. For references that are unknown and non-repeatable, an estimate of the derivative of the reference signal is computed, weighted, and added to weighted derivatives of the estimate, where the weights or coefficients of this function are also determined by minimizing the sliding mode variable &sgr;k.
摘要翻译：离散时间滑动模式控制器（SMC）控制诸如磁盘存储系统中的读取头的机械装置的运动。通过将线性控制工作与通过在增益之间切换产生的离散时间滑动模式控制努力组合以便将系统的相位状态推向滑动线轨迹来产生总体控制努力。产生参考的估计并将其加到控制努力中，从而提供参考信号的导数的近似值。可以通过各种方法来执行参考信号的估计，这取决于参考是否已知，未知但可重复，或者完全未知且不可重复。采用最小均方（LMS）算法通过计算最小化特定系统参数的函数的系数来估计参考信号。如果参考是未知的，可重复的正弦曲线，例如盘存储装置中的跳动信号，则可以通过使位置误差相位状态最小化来确定合成正弦曲线的系数。或者，可以通过最小化限定系统相位状态相对于滑动线的位置的滑动模式变量sigmak来确定合成正弦曲线的系数。对于未知且不可重复的参考，计算参考信号的导数的估计，加权并加到估计的加权导数中，其中该函数的权重或系数也通过最小化滑动模式变量来确定 sigmak。

8. 发明授权

US5847895A Chatter reduction in sliding mode control of a disk drive actuator 失效
标题翻译：磁盘驱动器执行器的滑动模式控制中的抖动减少
公开(公告)号：US5847895A
公开(公告)日：1998-12-08
申请号：US943997
申请日：1997-10-03
申请人： Paul M. Romano , Louis Supino
发明人： Paul M. Romano , Louis Supino
IPC分类号： G11B5/55 , G11B5/596
CPC分类号： G11B5/5547 , G11B5/59622
摘要： A sliding mode controller is disclosed for controlling a read/write head actuator in a magnetic disk drive storage system wherein a voice coil motor connected to the actuator operates to adjust the position of the read/write head over a selected data track recorded on a magnetic medium. The sliding mode controller comprises an improved technique for reducing chatter associated with the inherent operation of such a controller--rapid switching between gains to force the observable phase states to follow a predetermined phase state trajectory. The sliding mode controller generates a motor control command by multiplying an actuator position error and an actuator position error velocity by respective switching gains. The gains are switched according to a predetermined relationship .sigma. between the phase states and a phase state trajectory. In order to reduce the switching frequency (i.e., chatter), a boundary layer around the phase state trajectory results in hysteresis, causing the gain blocks to switch only after the phase states cross over the boundary line. Further chatter reduction is achieved by generating the motor control signal proportional to an integral of sgn(.sigma.). The cost of the sliding mode controller is reduced by implementing the phase state trajectory .sigma. as a lookup table indexed by a single phase state.
摘要翻译：公开了一种用于控制磁盘驱动器存储系统中的读/写头致动器的滑动模式控制器，其中连接到致动器的音圈电机用于调节读/写头在记录在磁性上的所选数据轨道上的位置中。滑动模式控制器包括用于减少与这种控制器的固有操作相关联的颤动的改进技术 - 在增益之间的快速切换以迫使可观察相位状态遵循预定的相位状态轨迹。滑动模式控制器通过将致动器位置误差和致动器位置误差速度乘以相应的开关增益来产生电动机控制命令。根据相位状态和相位状态轨迹之间的预定关系sigma来切换增益。为了降低开关频率（即颤振），相位状态轨迹周围的边界层会产生迟滞，导致增益块仅在相位状态越过边界线之后才切换。通过产生与sgn（sigma）的积分成比例的电动机控制信号来实现进一步的颤振减小。通过将相状态轨迹sigma作为由单相状态索引的查找表来实现滑模控制器的成本。

9. 发明授权

US5586306A Integrated circuit servo system control for computer mass storage device with distributed control functionality to reduce transport delay 失效
标题翻译：用于具有分布式控制功能的计算机大容量存储设备的集成电路伺服系统控制，以减少传输
公开(公告)号：US5586306A
公开(公告)日：1996-12-17
申请号：US448098
申请日：1995-05-23
申请人： Paul M. Romano , Larry D. King , John S. Geldman , Bhupendra K. Ahuja , Palaksha Setty , Petro Estakhri , Son Ho , Phuc Tran , Maryam Imam
发明人： Paul M. Romano , Larry D. King , John S. Geldman , Bhupendra K. Ahuja , Palaksha Setty , Petro Estakhri , Son Ho , Phuc Tran , Maryam Imam
IPC分类号： G11B5/55 , G11B5/596 , G11B19/02 , G11B19/12 , G11B19/20 , G11B19/28 , G11B20/10 , G11B21/08 , G11B21/10 , G11B27/30 , G11B33/10 , G06F3/00
CPC分类号： G11B27/3027 , G11B19/02 , G11B19/12 , G11B19/20 , G11B19/28 , G11B20/10 , G11B21/083 , G11B21/106 , G11B5/5526 , G11B5/59605 , G11B5/59655 , G11B33/10
摘要： An integrated circuit controls the low level, electromechanical functionality of a computer mass storage device, such as a magnetic disk drive incorporating a spindle motor for rotatably controlling a disk and an actuator for positioning at least one read/write head with respect to the disk, to read or write encoded data configured in information data sectors and to sense encoded data of servo data sectors. A servo subsystem is coupled to an output of the read/write head for detecting the servo data sectors and providing a control signal in response thereto. An analog-to-digital subsystem is also coupled to an output of the read/write head and is operative in response to the servo subsystem control signal for converting the encoded data of the servo data sectors to digital transducer position information representative of a position of the read/write head with respect to the data tracks. A data processing subsystem is coupled to the analog-to-digital subsystem for processing the digital transducer position information and providing digital motion control signals in response thereto. A digital-to-analog subsystem is coupled to the data processing subsystem for providing analog control signals to the spindle motor and the actuator in response to the digital motion control signals.
摘要翻译：集成电路控制计算机大容量存储装置的低级机电功能，例如包括用于可旋转地控制盘的主轴电机的磁盘驱动器和用于相对于盘定位至少一个读/写头的致动器，读取或写入配置在信息数据扇区中的编码数据，并读取伺服数据扇区的编码数据。伺服子系统耦合到读/写头的输出端，用于检测伺服数据扇区并提供响应于此的控制信号。模拟数字子系统还耦合到读/写头的输出端，并响应于伺服子系统控制信号操作，用于将伺服数据扇区的编码数据转换为数字换能器位置信息，该位置信息表示相对于数据轨道的读/写头。数据处理子系统耦合到模数 - 数字子系统，用于处理数字换能器位置信息并响应于此提供数字运动控制信号。数字到模拟子系统耦合到数据处理子系统，用于响应于数字运动控制信号向主轴电动机和致动器提供模拟控制信号。

10. 发明授权

US5917784A Trellis sequence detector for detecting a quadrature servo signal in disk recording systems 失效
标题翻译：网格序列检测器，用于检测磁盘记录系统中的正交伺服信号
公开(公告)号：US5917784A
公开(公告)日：1999-06-29
申请号：US54584
申请日：1998-04-03
申请人： Louis Supino , Paul M. Romano , Jim Graba
发明人： Louis Supino , Paul M. Romano , Jim Graba
IPC分类号： G11B7/085 , G11B17/22
CPC分类号： G11B7/08541 , G11B7/08529
摘要： A trellis sequence detector is disclosed for detecting a quadrature servo signal in optical disk storage devices. The quadrature servo signal is generated in discrete time and comprises two sinusoidal signals phase offset by 90 degrees. The sampling frequency of the quadrature signal is controlled relative to the track crossing velocity so as to produce a fixed number of samples per period of the sinusoid (i.e., per track crossing). In the embodiment disclosed herein, the sampling of the sinusoidal signals is controlled such that there are eight samples per track crossing. The eight samples are associated with a state transition diagram and corresponding trellis diagram which define the operation of a trellis sequence detector. The trellis sequence detector processes the actual samples of the quadrature signal to determine an estimated quadrature sequence closest to the actual samples of the quadrature signal. In this manner, spurious pulses in the actual quadrature signal are filtered out which significantly enhances the performance of the servo system.
摘要翻译：公开了一种用于检测光盘存储装置中的正交伺服信号的网格序列检测器。正交伺服信号在离散时间内产生，并包括相位偏移90度的两个正弦信号。相对于轨道交叉速度控制正交信号的采样频率，以便产生每个正弦曲线周期（即，每个轨道交叉）的固定数量的采样。在本文公开的实施例中，控制正弦信号的采样，使得每个轨道交叉有八个采样。八个样本与状态转换图和对应的网格图相关联，其定义了网格序列检测器的操作。网格序列检测器处理正交信号的实际采样以确定最接近正交信号的实际采样的估计正交序列。以这种方式，实际正交信号中的杂散脉冲被滤除，这显着增强了伺服系统的性能。

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