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11.发明授权Method and apparatus for minimizing seek time in a disk drive by increasing power amplifier power based on power amplifier voltage head room 失效通过增加基于功率放大器电压头部的功率放大器功率来最小化磁盘驱动器中的寻道时间的方法和装置
公开(公告)号：US5684653A
公开(公告)日：1997-11-04
申请号：US586429
申请日：1996-01-16
申请人： Vernon L. Knowles
发明人： Vernon L. Knowles
CPC分类号： G11B5/5547 , G11B21/083
摘要： A system for minimizing seek time in a disk drive having a power amplifier for controlling a servo actuator. The system includes at least one output terminal of the power amplifier connected to a processor for detecting and calculating a head room voltage for the power amplifier for seek operations, the head room voltage indicative of a margin of power available for controlling seek operations. A preferred method includes calculating a head room voltage for the power amplifier by detecting a saturation value of the amplifier during an acceleration phase in a first seek direction, and detecting an output voltage during a deceleration phase for a second seek operation in an opposite direction. The method further includes adjusting power to the power amplifier on a next seek operation based on the head room voltage calculated, such that at least some of the margin of power available identified by the head room voltage is used on the next seek operation for reducing seek time.
摘要翻译： 一种用于最小化具有用于控制伺服致动器的功率放大器的磁盘驱动器中的寻道时间的系统。 该系统包括连接到处理器的功率放大器的至少一个输出端子，用于检测和计算用于寻道操作的功率放大器的头部房间电压，头部房间电压指示可用于控制寻道操作的功率余量。 优选的方法包括通过在第一搜索方向的加速阶段中检测放大器的饱和度值，并且在相反方向上的第二寻找操作的减速阶段期间检测输出电压来计算功率放大器的头房电压。 该方法还包括基于所计算的头房电压在下一个寻道操作中调整功率放大器的功率，使得在下一个寻道操作中使用由头房电压识别的功率余量中的至少一些可用于减少寻道 时间。
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12.发明授权Method and apparatus for reducing phase lag resulting from digital to analog conversion 失效用于减少由数模转换产生的相位滞后的方法和装置
公开(公告)号：US5682159A
公开(公告)日：1997-10-28
申请号：US603626
申请日：1996-02-21
CPC分类号： H03M1/0836 , G11B21/106 , G11B7/0941 , G11B20/10527 , H03M1/662
摘要： A method and apparatus for implementing a zero order hold function in the digital to analog conversion process in a digital control system reduces the phase lag contributed by the digital to analog conversion process relative to a conventional implementation of the zero order hold function. The apparatus for implementing the reduced phase lag zero order hold function employs a digital signal processor, a plurality of digital buffers, a digital multiplexing element, and a digital to analog converter. Phase lag is reduced by generating, from the digital to analog converter, for a fraction of the sample period, a waveform having a constant analog voltage with an amplitude which is scaled by the reciprocal of said fraction relative to a conventional zero order hold function. During the remainder of the sample period a substantially constant offset analog voltage is generated by the digital to analog converter. Alternatively, the time compression and amplitude scaling required to implement the reduced phase lag zero order hold function can be performed within the digital signal processor in the digital control system.
摘要翻译： 在数字控制系统中的数模转换处理中实现零阶保持功能的方法和装置相对于零级保持功能的传统实现，减少了数模转换过程所产生的相位滞后。 用于实现减少相位滞后零阶保持功能的装置采用数字信号处理器，多个数字缓冲器，数字多路复用元件和数模转换器。 通过从数字模拟转换器产生一小部分采样周期的相位滞后，具有恒定模拟电压的波形，其具有相对于常规零级保持功能由所述分数的倒数缩放的幅度。 在采样周期的剩余时间期间，数模转换器产生基本恒定的偏移模拟电压。 或者，实现减少的相位滞后零阶保持功能所需的时间压缩和幅度缩放可以在数字控制系统中的数字信号处理器内执行。
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公开(公告)号：US07835103B2
公开(公告)日：2010-11-16
申请号：US12242180
申请日：2008-09-30
IPC分类号： G11B15/087 , G11B15/22 , G11B15/43 , G11B15/44
CPC分类号： G11B5/00817 , G11B5/09 , G11B5/78
摘要： A system and method for reducing tape wear in a magnetic tape system. A tape drive comprises a wrap reverse location controller. The wrap reverse location controller determines a magnetic tape reversal location. The tape drive reverses the direction of the magnetic tape at the reversal location. The wrap reverse location controller determines the tape reversal location by varying, relative to the tape heads, the longitudinal tape location at which tape direction reversals are performed at each end of the tape.
摘要翻译： 一种用于减少磁带系统中的磁带磨损的系统和方法。 磁带驱动器包括回卷位置控制器。 包装反向位置控制器确定磁带反转位置。 磁带驱动器在反转位置反转磁带的方向。 卷绕反向位置控制器通过相对于带头改变在带的每个端部处进行带方向反转的纵向带位置来确定带的反转位置。
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公开(公告)号：US20100079907A1
公开(公告)日：2010-04-01
申请号：US12242180
申请日：2008-09-30
IPC分类号： G11B5/027
CPC分类号： G11B5/00817 , G11B5/09 , G11B5/78
摘要： A system and method for reducing tape wear in a magnetic tape system. A tape drive comprises a wrap reverse location controller. The wrap reverse location controller determines a magnetic tape reversal location. The tape drive reverses the direction of the magnetic tape at the reversal location. The wrap reverse location controller determines the tape reversal location by varying, relative to the tape heads, the longitudinal tape location at which tape direction reversals are performed at each end of the tape.
摘要翻译： 一种用于减少磁带系统中的磁带磨损的系统和方法。 磁带驱动器包括回卷位置控制器。 包装反向位置控制器确定磁带反转位置。 磁带驱动器在反转位置反转磁带的方向。 卷绕反向位置控制器通过相对于带头改变在带的每个端部处进行带方向反转的纵向带位置来确定带的反转位置。
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公开(公告)号：US06937425B2
公开(公告)日：2005-08-30
申请号：US10464102
申请日：2003-06-18
申请人： Vernon L. Knowles , Ted A. Brooks
发明人： Vernon L. Knowles , Ted A. Brooks
CPC分类号： G11B5/584
摘要： A head-track alignment system and method. An embodiment of the system comprises: a head assembly capable of detecting arrival of servo frames in a first and second servo track of a tape; an alignment processor coupled to the head assembly generating a head-track alignment signal based on a comparison of the arrival times of the servo frames in the first and second servo tracks; and wherein the head-track alignment signal can be generated while accessing the tape. An embodiment of the method comprises: determining tape tilt with respect to a head assembly of a tape drive while accessing a tape, and compensating for the tape tilt.
摘要翻译： 头轨对准系统和方法。 该系统的一个实施例包括：能够检测伺服帧到达磁带的第一和第二伺服轨道中的磁头组件; 耦合到所述头部组件的对准处理器，其基于所述伺服帧在所述第一和第二伺服轨道中的到达时间的比较来产生头轨道对准信号; 并且其中可以在访问磁带的同时产生头轨对准信号。 该方法的一个实施例包括：在访问磁带的同时确定相对于磁带驱动器的磁头组件的磁带倾斜度，以及补偿磁带倾斜。
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公开(公告)号：US4775903A
公开(公告)日：1988-10-04
申请号：US919099
申请日：1986-10-14
申请人： Vernon L. Knowles
发明人： Vernon L. Knowles
CPC分类号： G11B5/59644 , G11B5/5547
摘要： An improved method and apparatus for performing seek and track follow operations in a disc drive provides time varying acceleration profile and track position trajectory signals which have the same time duration and which are developed as a function of seek length. These signals are successively simultaneously sampled at the same points in time. The sampled acceleration profile and track position trajectory signals from the same points in time are simultaneously applied as a feed forward signal and a position reference signal, respectively, in the disc drive to position a magnetic head at a selected track. During a seek operation, each actual track position signal and subtrack position signal from the transducer is compared with an existing sampled track position trajectory signal. At the end of the seek movement, track following continues under the control of the subtrack position signals.
摘要翻译： 用于在盘驱动器中执行追踪跟踪追踪操作的改进的方法和装置提供具有相同持续时间并根据寻找长度而被发展的时变加速度曲线和跟踪位置轨迹信号。 这些信号在相同的时间点连续同时采样。 来自相同时间点的采样加速度曲线和轨迹位置轨迹信号分别作为前馈信号和位置参考信号分别施加在盘驱动器中以将磁头定位在所选轨道处。 在寻道操作期间，将来自换能器的每个实际轨道位置信号和子轨迹位置信号与现有的采样轨迹位置轨迹信号进行比较。 在寻道运动结束时，跟踪跟踪继续在子轨迹位置信号的控制之下。
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公开(公告)号：US4688118A
公开(公告)日：1987-08-18
申请号：US880973
申请日：1986-07-01
CPC分类号： G11B5/59627
摘要： Improvements are realized in magnetic disc drives in minimizing servo gain variations from one head to another and in differing track offset positions by providing servo code patterns and methods of fabricating such patterns in which magnetic heads of differing widths overlap the same amount of servo code and in which servo gain variations in track offset positions are minimized by maintaining servo code overlap by the magnetic heads relatively constant up to substantially one-half track offsets of magnetic head.
摘要翻译： 通过提供伺服代码图案和制造这样的图案的方法，在磁盘驱动器中实现了从一个磁头到另一个磁头和不同磁道偏移位置的伺服增益变化的改进，其中不同宽度的磁头与相同量的伺服代码重叠， 磁道偏移位置上的伺服增益变化通过将磁头的伺服代码重叠保持相对恒定的磁头的大致半个磁道偏移来保持最小化。
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公开(公告)号：US4786990A
公开(公告)日：1988-11-22
申请号：US869268
申请日：1986-05-30
CPC分类号： G11B5/59622
摘要： Compensation for servo gain variations when connected to different magnetic heads in a disc memory drive is achieved by determining individual servo gain corrections for each magnetic head at several different selected tracks on the associated memory disc, storing the individual servo gain corrections and addressing a stored individual servo gain correction for each selected magnetic head for coupling to the servo to equalize servo gain when positioning each selected magnetic head at a selected track.
摘要翻译： 通过在相关联的存储盘上的几个不同的选定轨道上确定每个磁头的各个伺服增益校正来实现连接到盘存储器驱动器中的不同磁头时的伺服增益变化的补偿，存储各个伺服增益校正并寻址存储的个体 每个所选磁头的伺服增益校正用于耦合到伺服以在将所选择的磁头定位在所选轨道时均衡伺服增益。
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