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1. 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。

2. 发明授权

US6157604A Sampled amplitude read channel employing a baud rate estimator for digital timing recovery in an optical disk storage device 失效
标题翻译：采用波特率估计器的采样幅度读取通道用于光盘存储设备中的数字定时恢复
公开(公告)号：US6157604A
公开(公告)日：2000-12-05
申请号：US80559
申请日：1998-05-18
申请人： German S. Feyh , Jim Graba , William G. Bliss
发明人： German S. Feyh , Jim Graba , William G. Bliss
IPC分类号： G11B20/14 , G11B27/30 , H03L7/091 , H03M13/41 , H04N5/85 , H04N5/76
CPC分类号： G11B20/10037 , G11B20/10055 , G11B20/10296 , G11B20/1403 , G11B27/3027 , H03L7/091 , H03M13/41 , H03M13/6331 , H03M13/6505 , H03M13/6563 , H03M13/6569 , H04N5/85 , G11B2020/10916 , G11B2220/2545 , G11B2220/2562
摘要： A sampled amplitude read channel for optical disk storage systems is disclosed comprising an all digital timing recovery circuit. The RF read signal from the read head is sampled asynchronous to the baud rate and the asynchronous sample values are interpolated to generate sample values that are substantially synchronous to the baud rate. A data detector, such as a Viterbi sequence detector, processes the synchronous sample values to generate an estimated binary sequence representing the recorded binary sequence. The timing recovery circuit comprises a baud rate estimator for estimating the baud rate relative to the sampling rate, wherein the estimated baud rate is used to initialize a timing recovery loop filter at the end of seek operations. The all digital timing recovery circuit and baud rate estimator enable the storage device to begin reading the user data immediately after a seek operation, rather than wait for the CLV servo loop to acquire the target spindle speed.
摘要翻译：公开了一种用于光盘存储系统的采样幅度读取通道，其包括全数字定时恢复电路。来自读取头的RF读取信号与波特率异步采样，并且内插异步采样值以产生与波特率基本同步的采样值。诸如维特比序列检测器的数据检测器处理同步采样值以产生表示记录的二进制序列的估计二进制序列。定时恢复电路包括用于估计相对于采样率的波特率的波特率估计器，其中所估计的波特率用于在搜索操作结束时初始化定时恢复环路滤波器。全数字定时恢复电路和波特率估计器使存储设备能够在搜索操作之后立即开始读取用户数据，而不是等待CLV伺服循环获取目标主轴转速。

3. 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。

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