公开(公告)号：US20110007418A1

公开(公告)日：2011-01-13

申请号：US12878722

申请日：2010-09-09

申请人： Nhan Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

发明人： Nhan Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

IPC分类号： G11B5/584

CPC分类号： G11B5/584

摘要： A weighted combining scheme exploits information from two servo channels operating in parallel. A timing-based servo module comprises two synchronous servo channels coupled respectively to receive two digital servo signals read from a data tape. Both channels have outputs for an unweighted parameter estimate and for a measure of the channel reliability. A weight computation module provides first and second weight signals using the measures of channel reliability from the servo channels. An offset computation module provides first and second offset terms which are summed with the unweighted parameter estimates. Multiplying nodes receive the unweighted parameter estimates and the weight signals and outputs offset weighted parameter estimates. A summing node receives the offset weighted parameter estimates and outputs a combined offset weighted parameter estimate to a servomechanism.

摘要翻译： 加权组合方案利用来自并行操作的两个伺服通道的信息。 基于定时的伺服模块包括分别耦合的两个同步伺服通道，以接收从数据磁带读取的两个数字伺服信号。 两个通道具有未加权参数估计的输出和通道可靠性的度量。 权重计算模块使用来自伺服信道的信道可靠性的测量来提供第一和第二加权信号。 偏移计算模块提供与未加权参数估计相加的第一和第二偏移项。 乘法节点接收未加权的参数估计和权重信号并输出​​偏移加权参数估计。 求和节点接收偏移加权参数估计，并将组合的偏移加权参数估计输出到伺服机构。

公开(公告)号：US07110212B2

公开(公告)日：2006-09-19

申请号：US11012950

申请日：2004-12-15

申请人： Nhan Bui ,  Randy Inch ,  Eiji Ogura ,  Kazuhiro Tsuruta

发明人： Nhan Bui ,  Randy Inch ,  Eiji Ogura ,  Kazuhiro Tsuruta

IPC分类号： G11B5/596

CPC分类号： G11B5/584 ,  G11B15/688

摘要： Disclosed are a system, a method, and article of manufacture to provide a compensator for a synchronous sampling servo control system.

摘要翻译： 公开了一种为同步采样伺服控制系统提供补偿器的系统，方法和制品。

公开(公告)号：US20050174681A1

公开(公告)日：2005-08-11

申请号：US10776300

申请日：2004-02-10

申请人： David Berman ,  Nhan Bui ,  Michael Melas ,  Mark Taylor

发明人： David Berman ,  Nhan Bui ,  Michael Melas ,  Mark Taylor

IPC分类号： G11B5/584

CPC分类号： G11B5/584

摘要： Disclosed are a system, a method, and article of manufacture to provide for filtering a servo signal in a tape drive using a matched filter that is optimized for the operating tape velocity of the tape drive. A servo controller for track following on a tape uses a digital filter implementation of the matched filter to produce a filtered servo signal. The digital filter is optimized for different tape velocities by selecting digital filter coefficients for the digital filter that depend upon the tape velocity presently in use. The filtered servo signal is used by the servo controller to provide improved track following in a tape drive.

摘要翻译： 公开了一种系统，方法和制品，用于使用针对带驱动器的操作带速度优化的匹配滤波器来过滤磁带驱动器中的伺服信号。 用于磁带跟踪的伺服控制器使用匹配滤波器的数字滤波器来实现滤波后的伺服信号。 通过为数字滤波器选择数字滤波器系数，数字滤波器针对不同的磁带速度进行了优化，这取决于当前使用的磁带速度。 伺服控制器使用滤波后的伺服信号，在磁带驱动器中提供改进的跟踪。

公开(公告)号：US06344720B1

公开(公告)日：2002-02-05

申请号：US09429674

申请日：1999-10-28

申请人： John Alexander Koski ,  Nhan Bui

发明人： John Alexander Koski ,  Nhan Bui

IPC分类号： H02P608

CPC分类号： H02P6/085 ,  H02P6/14

摘要： A current mode pulse width modulation (PWM) technique for brushless motors. The present system and method controls a brushless motor by increasing or decreasing motor speed respectively according to the polarity and value of a pulse width modulation (PWM) control signal. The PWM signal varies according to an error signal generated in proportion to the difference between a desired motor current and an actual motor current. A motor current sensor is used to sense an actual motor current being applied to the motor. A current comparator is used to compare the current desired reference signal and the actual current signal and to generate an error signal. A pulse width modulator is used to convert the error signal to a pulse-width modulated error signal. Armature position sensors are used for sensing armature positions of the motor. A commutator circuit receives the pulse-width modulated error signal and the armature positions of the motor. Power switches are coupled to outputs of the commutator and also coupled to the motor. The commutator controls activation and deactivation of the respective power switches based on the corresponding pulse-width modulated error signal to control the motor at a desired motor current that corresponds to the desired reference current signal. The commutator controls the respective power switches to drive the motor in either a more positive, a more negative direction, or in the same manner to respectively increase, decrease, or maintain the motor speed when the error signal correspondingly has a generally positive, negative, or zero value.

摘要翻译： 无刷电机的电流模式脉宽调制（PWM）技术。 本系统和方法通过根据脉宽调制（PWM）控制信号的极性和值分别增加或降低电动机速度来控制无刷电动机。 PWM信号根据与期望的电动机电流和实际电动机电流之间的差成比例地生成的误差信号而变化。 电动机电流传感器用于感测施加到电动机的实际电动机电流。 电流比较器用于比较当前所需的参考信号和实际电流信号，并产生误差信号。 使用脉冲宽度调制器将误差信号转换为脉宽调制误差信号。 电枢位置传感器用于检测电机的电枢位置。 换向器电路接收脉宽调制误差信号和电动机的电枢位置。 电源开关耦合到换向器的输出并且还耦合到电动机。 换向器基于对应的脉冲宽度调制误差信号来控制各个功率开关的激活和去激活，以在对应于期望的参考电流信号的期望的电动机电流下控制电动机。 当误差信号相应地具有大致正，负的方向时，换向器控制各个功率开关以更正，更负的方向或以相同的方式驱动电动机来分别增加，减小或维持电动机速度， 或零值。

公开(公告)号：US20100226039A1

公开(公告)日：2010-09-09

申请号：US12400420

申请日：2009-03-09

申请人： Nhan Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

发明人： Nhan Bui ,  Giovanni Cherubini ,  Roy D. Cideciyan ,  Robert A. Hutchins ,  Jens Jelitto ,  Kazuhiro Tsuruta

IPC分类号： G11B5/584

CPC分类号： G11B5/584

摘要： A weighted combining scheme exploits information from two servo channels operating in parallel. A timing-based servo module comprises two synchronous servo channels coupled respectively to receive two digital servo signals read from a data tape. Both channels have outputs for an unweighted parameter estimate and for a measure of the channel reliability. A weight computation module provides first and second weight signals using the measures of channel reliability from the servo channels. An offset computation module provides first and second offset terms which are summed with the unweighted parameter estimates. Multiplying nodes receive the unweighted parameter estimates and the weight signals and outputs offset weighted parameter estimates. A summing node receives the offset weighted parameter estimates and outputs a combined offset weighted parameter estimate to a servomechanism.

公开(公告)号：US20080117539A1

公开(公告)日：2008-05-22

申请号：US12024127

申请日：2008-02-01

申请人： Nhan Bui ,  Reed Hancock ,  Eiji Ogura ,  Kazuhiro Tsuruta

发明人： Nhan Bui ,  Reed Hancock ,  Eiji Ogura ,  Kazuhiro Tsuruta

IPC分类号： G11B5/09 ,  G11B5/584

CPC分类号： G11B5/584

摘要： A magnetic tape cartridge including magnetic tape with servo information is provided. The servo information comprises a plurality of parallel longitudinal servo bands that lie between a plurality of longitudinal data bands. The plurality of servo bands include odd servo bands and even servo bands, wherein each of the odd servo bands lie between each of the even servo bands. Each of the plurality servo bands include a plurality of frames, wherein each frame includes a plurality of bursts of transition stripes, and each burst having a first transition stripe. The first transition stripe of each burst of each the odd servo band is longitudinally shifted from the first transition stripe of each burst of each even servo band by a substantially equal distance, D, such that servo information of the odd servo bands is interleaved with the servo information from the even servo bands.

摘要翻译： 提供一种包括具有伺服信息的磁带的磁带盒。 伺服信息包括位于多个纵向数据带之间的多个并行纵向伺服带。 多个伺服频带包括奇数伺服频带和偶数伺服频带，其中奇数伺服频带中的每一个位于每个偶数伺服频带之间。 多个伺服频带中的每一个包括多个帧，其中每个帧包括多个过渡条纹脉冲串，并且每个脉冲串具有第一过渡条带。 每个奇数伺服频带的每个脉冲串的第一个转移条纹从每个偶数伺服频带的每个脉冲串的第一转移条带纵向偏移大致相等的距离D，使得奇数伺服带的伺服信息与 来自偶数伺服带的伺服信息。

公开(公告)号：US20070188910A1

公开(公告)日：2007-08-16

申请号：US11351774

申请日：2006-02-10

申请人： Nhan Bui ,  Ernest Gale ,  Eiji Ogura ,  Kazuhiro Tsuruta

发明人： Nhan Bui ,  Ernest Gale ,  Eiji Ogura ,  Kazuhiro Tsuruta

IPC分类号： G11B5/584 ,  G11B5/55

CPC分类号： G11B5/584

摘要： A magnetic tape drive, having a compound servo actuator, reduces the possibility of overshoots of servo elements when a tape cartridge is loaded, thereby reducing servo failures. The coarse motor is activated, then deactivated when the servo elements locate a servo pattern on the tape. After initialization of a DAC offset in the servo controller to 0, the position of the fine actuator is read. The fine actuator is enabled, with a DAC input of 0 and, after a short wait, the position is again read. The new DAC offset equals the initial DAC offset plus the difference between the two positions. If the difference is less than a predetermined threshold, the servo controller may obtain a lock on the servo signals and commence tracking. If the difference is not less, the process is repeated, with the DAC offset being adjusted each time, until the difference is less than a predetermined threshold.

摘要翻译： 具有复合伺服致动器的磁带驱动器减少了当装入带盒时伺服元件过冲的可能性，从而减少了伺服故障。 粗电机被激活，然后当伺服元件在磁带上定位伺服模式时，停用。 在伺服控制器中DAC偏移初始化为0后，读取精细执行器的位置。 精准执行器使能，DAC输入为0，在短暂等待之后，再次读取位置。 新的DAC偏移量等于初始DAC偏移加上两个位置之间的差值。 如果差小于预定阈值，则伺服控制器可获得对伺服信号的锁定并开始跟踪。 如果差值不小于该值，则每次调整DAC偏移量，直到该差值小于预定阈值为止。

公开(公告)号：US20070187540A1

公开(公告)日：2007-08-16

申请号：US11674615

申请日：2007-02-13

申请人： Nhan Bui ,  Junichi Fukuda ,  Randy Inch ,  Eiji Ogura ,  Kazuhiro Tsuruta

发明人： Nhan Bui ,  Junichi Fukuda ,  Randy Inch ,  Eiji Ogura ,  Kazuhiro Tsuruta

IPC分类号： G11B15/32

CPC分类号： G11B15/093

摘要： Disclosed are a system, a method, and an article of manufacture to provide for the detection and compensation of tape breakage in a tape drive. The invention operates by simultaneously monitoring the tape reel rotation direction and the ratio of rotation between the tape reels. If the rotation direction is not the same for both reels, then tape breakage is indicated and reel rotation ceases. Tape breakage is also detected if the tape reel angular rotation ratio between the supply and take up reels is not within a specified tape reel ratio range. The tape reel angular rotation ratio is detected by simultaneously measuring the angular rotation of each tape reel in a specified time period and then calculating the ratio. The present invention detects the tape reel angular rotation ratio and if tape reel angular rotation ratio is outside of the specified tape reel ratio range, tape breakage is indicated and reel rotation ceases.

摘要翻译： 公开了一种用于提供磁带驱动器中的磁带破损的检测和补偿的系统，方法和制品。 本发明通过同时监测磁带卷轴的旋转方向和磁带盘之间的旋转比来操作。 如果两个卷轴的旋转方向不一致，则表示带子断裂，并且卷轴旋转停止。 如果供纸卷取卷轴之间的磁带卷轴角度旋转比不在指定的磁带卷盘比范围内，则也会检测到磁带断线。 通过在规定的时间段内同时测量每个磁带卷轴的角度旋转，然后计算该比率来检测磁带卷轴角度旋转比。 本发明检测磁带卷轴的角度旋转比，如果磁带卷轴角度旋转比在指定的磁带卷盘比例范围之外，则表示磁带破损并且卷轴旋转停止。

公开(公告)号：US20050286160A1

公开(公告)日：2005-12-29

申请号：US11215758

申请日：2005-08-29

申请人： Nhan Bui ,  James Eaton ,  Junichi Fukuda ,  Glen Jaquette ,  Eiji Ogura ,  Mark Taylor ,  Kazuhiro Tsuruta

发明人： Nhan Bui ,  James Eaton ,  Junichi Fukuda ,  Glen Jaquette ,  Eiji Ogura ,  Mark Taylor ,  Kazuhiro Tsuruta

IPC分类号： G11B5/008 ,  G11B5/584 ,  G11B5/78 ,  G11B5/09

CPC分类号： G11B5/584 ,  G11B5/00813 ,  G11B5/78

摘要： In a tape having separate servo bands of patterns positioned laterally across the tape, the patterns of a separate servo band have at least one differentiating characteristic with respect to patterns of another of the separate servo bands. The differentiating characteristic allows identification of the separate servo bands. For example, the patterns of a separate servo band have differing azimuthal orientations of detectable transitions with respect to another servo band, such as being laterally inverted. In another, variations in the width of gaps of patterns are made with respect to another servo band. In another, variations are made in the number of the detectable transitions of patterns with respect to the patterns of another servo band.

公开(公告)号：US20050286159A1

公开(公告)日：2005-12-29

申请号：US11215627

申请日：2005-08-29

申请人： Nhan Bui ,  James Eaton ,  Junichi Fukuda ,  Glen Jaquette ,  Eiji Ogura ,  Mark Taylor ,  Kazuhiro Tsuruta

发明人： Nhan Bui ,  James Eaton ,  Junichi Fukuda ,  Glen Jaquette ,  Eiji Ogura ,  Mark Taylor ,  Kazuhiro Tsuruta

IPC分类号： G11B5/008 ,  G11B5/584 ,  G11B5/78 ,  G11B5/09

CPC分类号： G11B5/584 ,  G11B5/00813 ,  G11B5/78

摘要： In a tape having separate servo bands of patterns positioned laterally across the tape, the patterns of a separate servo band have at least one differentiating characteristic with respect to patterns of another of the separate servo bands. The differentiating characteristic allows identification of the separate servo bands. For example, the patterns of a separate servo band have differing azimuthal orientations of detectable transitions with respect to another servo band, such as being laterally inverted. In another, variations in the width of gaps of patterns are made with respect to another servo band. In another, variations are made in the number of the detectable transitions of patterns with respect to the patterns of another servo band.

摘要翻译： 在具有横向跨越带的位置的分离的图案的带的带中，单独的伺服带的图案相对于另一个分离的伺服带的图案具有至少一个微分特性。 微分特性允许识别单独的伺服带。 例如，单独的伺服带的图案具有相对于另一个伺服带的可检测转变的方位取向不同，例如横向倒置。 另一方面，相对于另一个伺服带，进行图案间隙宽度的变化。 另一方面，在相对于另一个伺服带的图案的图案的可检测转变的数量上进行变化。