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1. 发明授权

US08094402B2 Systems and methods for correcting magnetic tape dimensional instability 失效
标题翻译：用于校正磁带尺寸不稳定性的系统和方法
公开(公告)号：US08094402B2
公开(公告)日：2012-01-10
申请号：US12686302
申请日：2010-01-12
申请人： Nhan X. Bui , Edwin R. Childers , Eric R. Christensen , Reed A. Hancock , Diana J. Hellman
发明人： Nhan X. Bui , Edwin R. Childers , Eric R. Christensen , Reed A. Hancock , Diana J. Hellman
IPC分类号： G11B17/00 , G11B5/584 , G11B20/20
CPC分类号： G11B15/62 , G11B15/43 , G11B15/602
摘要： Magnetic tape devices encounter read and/or write errors when the tape is not being passed across the head with the proper tension and/or skew angle. According to one embodiment, a system which corrects for these problems comprises a head having an array of at least one of readers and writers, a drive mechanism for passing a magnetic recording tape over the head, a skew-inducing mechanism coupled to the head for adjusting a skew angle of a longitudinal axis of the array relative to a direction normal to a direction of tape travel over the head, and a controller in communication with the head. The system also determines a tape dimensional stability state of the tape and adjust the skew angle away from normal to the direction of tape travel and lowers a tension of the tape across the head if the tape dimensional stability state is in a contracted state.
摘要翻译：当磁带没有以适当的张力和/或倾斜角度穿过磁头时，磁带设备会遇到读取和/或写入错误。根据一个实施例，校正这些问题的系统包括具有读取器和写入器中的至少一个的阵列的头部，用于将磁记录带通过头部的驱动机构，耦合到头部的偏斜引导机构调整所述阵列的纵向轴线相对于垂直于所述头部上的带行进方向的方向的倾斜角度，以及与所述头部连通的控制器。该系统还确定胶带的胶带尺寸稳定性状态，并且如果胶带尺寸稳定状态处于收缩状态，则将偏斜角度调整为离开行走方向远离纸张行进方向并降低胶带横过头部的张力。

2. 发明申请

US20110170214A1 SYSTEMS AND METHODS FOR CORRECTING MAGNETIC TAPE DIMENSIONAL INSTABILITY 失效
标题翻译：用于校正磁带尺寸不稳定性的系统和方法
公开(公告)号：US20110170214A1
公开(公告)日：2011-07-14
申请号：US12686302
申请日：2010-01-12
申请人： Nhan X. Bui , Edwin R. Childers , Eric R. Christensen , Reed A. Hancock , Diana J. Hellman
发明人： Nhan X. Bui , Edwin R. Childers , Eric R. Christensen , Reed A. Hancock , Diana J. Hellman
IPC分类号： G11B20/18 , G11B17/34
CPC分类号： G11B15/62 , G11B15/43 , G11B15/602
摘要： Magnetic tape devices encounter read and/or write errors when the tape is not being passed across the head with the proper tension and/or skew angle. According to one embodiment, a system which corrects for these problems comprises a head having an array of at least one of readers and writers, a drive mechanism for passing a magnetic recording tape over the head, a skew-inducing mechanism coupled to the head for adjusting a skew angle of a longitudinal axis of the array relative to a direction normal to a direction of tape travel over the head, and a controller in communication with the head. The system also determines a tape dimensional stability state of the tape and adjust the skew angle away from normal to the direction of tape travel and lowers a tension of the tape across the head if the tape dimensional stability state is in a contracted state.
摘要翻译：当磁带没有以适当的张力和/或倾斜角度穿过磁头时，磁带设备会遇到读取和/或写入错误。根据一个实施例，校正这些问题的系统包括具有读取器和写入器中的至少一个的阵列的头部，用于将磁记录带通过头部的驱动机构，耦合到头部的偏斜引导机构调整所述阵列的纵向轴线相对于垂直于所述头部上的带行进方向的方向的倾斜角度，以及与所述头部连通的控制器。该系统还确定胶带的胶带尺寸稳定性状态，并且如果胶带尺寸稳定状态处于收缩状态，则将偏斜角度调整为离开行走方向远离纸张行进方向并降低胶带横过头部的张力。

3. 发明申请

US20130128374A1 FIXING TAP COEFFICIENTS IN A PROGRAMMABLE FINITE-IMPULSE-RESPONSE EQUALIZER 有权
标题翻译：可编程有限冲突均衡器中的固定技巧系数
公开(公告)号：US20130128374A1
公开(公告)日：2013-05-23
申请号：US13304227
申请日：2011-11-23
申请人： Eric R. Christensen , Ernest S. Gale , Robert A. Hutchins , Sedat Oelcer
发明人： Eric R. Christensen , Ernest S. Gale , Robert A. Hutchins , Sedat Oelcer
IPC分类号： G11B20/18 , H03K5/159
CPC分类号： G11B20/10046 , G11B20/10509 , G11B2220/90 , H03H21/0012 , H03H2021/0072
摘要： A method for selecting which tap coefficients of a programmable finite-impulse-response (FIR) equalizer to fix is disclosed. In one embodiment, such a method includes performing an initial calibration to determine an initial value for each tap coefficient of a FIR equalizer. These initial values may be used to produce a first waveform. The method then performs an operation on the first waveform to produce a second waveform comprising multiple lobes. The second waveform is then analyzed to determine one or more lobes of the second waveform that have the largest area. The method then fixes coefficients of one or more taps that are closest to the lobe or lobes having the largest area. A corresponding apparatus and computer program product are also disclosed.
摘要翻译：公开了一种用于选择可修复有限脉冲响应（FIR）均衡器的抽头系数以进行固定的方法。在一个实施例中，这种方法包括执行初始校准以确定FIR均衡器的每个抽头系数的初始值。这些初始值可用于产生第一波形。该方法然后对第一波形执行操作以产生包括多个波瓣的第二波形。然后分析第二波形以确定具有最大面积的第二波形的一个或多个波瓣。该方法然后固定最靠近具有最大面积的凸角或凸角的一个或多个抽头的系数。还公开了相应的装置和计算机程序产品。

4. 发明授权

US06256157B1 Method and apparatus for removing noise spikes 失效
标题翻译：消除噪音尖峰的方法和装置
公开(公告)号：US06256157B1
公开(公告)日：2001-07-03
申请号：US09079903
申请日：1998-05-15
申请人： Robert G. Biskeborn , Eric R. Christensen , David J. Seagle
发明人： Robert G. Biskeborn , Eric R. Christensen , David J. Seagle
IPC分类号： G11B2736
CPC分类号： G11B20/10009 , G11B5/02 , G11B20/24 , G11B2005/0016
摘要： A method and apparatus is disclosed for reducing electrical noise from noise spikes in an electrical information signal. The invention can provide protection of a data storage system from soft errors rate due to noise spikes appearing in the signal from the input transducer. A cancellation signal for the low frequency component (i.e. in the system bandwidth) of the noise signal is generated. The cancellation signal is derived from a frequency band that appears in the noise spike, but does not appear in the system bandwidth for the information signal. The cancellation signal is generated in the preferred embodiment by a cancellation signal generator comprising a high pass filter and a mixer. The mixer generates a cancellation signal by processing the high frequency portion using a waveform above the normal high frequency cutoff to reconstitute the low frequency component of the noise spike in the normal frequency band. Then, the cancellation signal and the delayed input signal are combined to reduce or remove the low frequency component of the noise spike. The remaining frequency components of the noise spike can easily be removed since they are outside of system bandwidth. The invention is particularly useful in a storage system having MR heads.
摘要翻译：公开了一种用于降低电信号信号中噪声尖峰的电噪声的方法和装置。本发明可以提供数据存储系统的保护，防止由于来自输入变换器的信号中出现的噪声尖峰引起的软错误率。产生噪声信号的低频分量（即系统带宽）的消除信号。消除信号从出现在噪声尖峰中的频带导出，但不出现在信息信号的系统带宽中。在优选实施例中，消除信号由包括高通滤波器和混频器的消除信号发生器产生。混频器通过使用高于正常高频截止频率的波形处理高频部分来重构正常频带中的噪声尖峰的低频分量来产生消除信号。然后，消除信号和延迟的输入信号被组合以减少或去除噪声尖峰的低频分量。噪声尖峰的剩余频率分量可以容易地被去除，因为它们在系统带宽之外。本发明在具有MR磁头的存储系统中特别有用。

5. 发明授权

US06408313B1 Dynamic memory allocation based on free memory size 有权
标题翻译：基于可用内存大小的动态内存分配
公开(公告)号：US06408313B1
公开(公告)日：2002-06-18
申请号：US09212173
申请日：1998-12-16
申请人： David G. Campbell , Eric R. Christensen
发明人： David G. Campbell , Eric R. Christensen
IPC分类号： G06F1730
CPC分类号： G06F9/5016 , Y10S707/959 , Y10S707/99956
摘要： A dynamic cache management mechanism determines the amount of memory available from a system on which a memory intensive application is running and dynamically manages the amount of cache for which real memory is associated or committed by the system. A background thread periodically queries the operating system to determine how much memory is available for use by applications. If the amount of memory, as identified in a free list is above a predetermined threshold, the application requests more memory for its use. If below the predetermined threshold, the application gives memory back to the operating system. The threshold used by the application to expand and shrink the memory it uses based upon system demand for memory.
摘要翻译：动态高速缓存管理机制确定从内存密集型应用程序运行的系统可用的内存量，并动态管理由系统关联或提交的实际内存的缓存量。后台线程会定期查询操作系统以确定应用程序可使用多少内存。如果在空闲列表中标识的内存量高于预定阈值，则应用程序请求更多的存储器供其使用。如果低于预定阈值，则应用程序将内存返回给操作系统。应用程序根据系统对存储器的需求扩展和缩小其使用的内存使用的阈值。

6. 发明授权

US06366946B1 Critical code processing management 有权
标题翻译：关键代码处理管理
公开(公告)号：US06366946B1
公开(公告)日：2002-04-02
申请号：US09213016
申请日：1998-12-16
申请人： Eric R. Christensen
发明人： Eric R. Christensen
IPC分类号： G06F900
CPC分类号： G06F9/526 , Y10S707/99938
摘要： A technique for processing a critical code section which cannot be executed concurrently by more than one executable unit (e.g., a thread, a process, a fiber, etc.). A first executable unit prepares a packet containing a “work request,” which describes work to be performed by the critical section. If the critical section is not in use by a second executable unit, then the first executable unit enters the critical section and performs the work described in the packet. If the critical section is in use by a second executable unit, then the second executable unit performs the work described in the packet on behalf of the first executable unit, thereby alleviating the necessity for the first executable unit to enter the critical section. In addition to the work request, the packet may also contain: a status indicating whether the work request has been performed, an event to be signaled upon completion of the work request, and/or a list pointer that may be used to link packets together in a linked list.
摘要翻译：用于处理不能由多于一个可执行单元（例如，线程，过程，光纤等）同时执行的关键代码段的技术。第一可执行单元准备包含“工作请求”的分组，该分组描述由关键部分执行的工作。如果关键部分不被第二可执行单元使用，则第一可执行单元进入关键部分并执行分组中描述的工作。如果关键部分由第二可执行单元使用，则第二可执行单元代表第一可执行单元执行分组中描述的工作，从而减轻了第一可执行单元进入关键部分的必要性。除了工作请求之外，分组还可以包含：指示工作请求是否已被执行的状态，在工作请求完成时要发出的信号的事件和/或可用于将分组连接在一起的列表指针在链表中。

7. 发明授权

US5799184A System and method for identifying data records using solution bitmasks 失效
标题翻译：使用解决方案位掩码来识别数据记录的系统和方法
公开(公告)号：US5799184A
公开(公告)日：1998-08-25
申请号：US108841
申请日：1993-08-17
申请人： David L. Fulton , Eric R. Christensen
发明人： David L. Fulton , Eric R. Christensen
IPC分类号： G06F17/30 , G06F12/30
CPC分类号： G06F17/30955 , G06F17/30327 , G06F17/30501 , Y10S707/99932 , Y10S707/99933
摘要： A system and method for information retrieval includes an input device, a storage device, an output device, and a data file stored in the storage device including n data records, and one or more index files having data corresponding to a key value comprising information derived from a data record, and the record number of the data record containing the data from which the key value is derived. The retrieval system further includes memory for storing a temporary solution bitmask n bits in length where each bit corresponds to a record in the data file and logic for accessing the data file ascertaining the record number for each data record corresponding to a key value which satisfies the search criteria, and logic for setting the bit corresponding to that record number in the temporary solution bitmask. The system also preferably includes logic for analyzing individual search criteria in a search query containing a plurality of search criteria to determine the extent to which the search is optimizable using the present invention, and logic for combining each of the temporary solution bitmasks ascertained for particular search criteria in a query to obtain a final solution bitmask representative of the set of all data records satisfying the query.
摘要翻译：用于信息检索的系统和方法包括存储在包括n个数据记录的存储设备中的输入设备，存储设备，输出设备和数据文件，以及一个或多个索引文件，其具有与包含信息的密钥值对应的数据来自数据记录，以及包含从其导出键值的数据的数据记录的记录号。检索系统还包括存储器，用于存储长度上的临时解决方案位掩码n位，其中每个位对应于数据文件中的记录，以及用于访问数据文件的逻辑，该数据文件确定每个数据记录的记录号，该数据记录对应于满足搜索条件和用于设置临时解决方案位掩码中与该记录号对应的位的逻辑。该系统还优选地包括用于分析包含多个搜索准则的搜索查询中的各个搜索标准的逻辑，以确定使用本发明来搜索可优化的程度，以及用于组合针对特定搜索确定的每个临时解决方案位掩码的逻辑查询中的标准，以获得满足查询的所有数据记录集合的最终解决方案位掩码。

8. 发明授权

US5457585A Tape edge detector using off tape and on tape MR noise 失效
标题翻译：磁带边缘检测器使用磁带和磁带MR噪声
公开(公告)号：US5457585A
公开(公告)日：1995-10-10
申请号：US231420
申请日：1994-04-22
申请人： Eric R. Christensen
发明人： Eric R. Christensen
IPC分类号： G11B15/00 , G11B5/55 , G11B5/584 , G11B15/60 , G11B33/10 , G11B21/12
CPC分类号： G11B5/5508 , G11B15/602 , G11B33/10 , G11B5/55
摘要： A magnetic tape edge detector is provided which detects the edge of the tape by processing the noise power produced by an MR element when it is completely off the tape and the noise power produced by the MR element when it is completely on the tape. The off tape noise power is produced by factors intrinsic to the MR element and circuitry connected thereto, while the on tape noise power is produced by the heating of the MR element due to friction between moving magnetic tape and the MR element. The difference between the off tape noise power and the on tape noise power is divided by an integer greater than one to produce a reference noise signal. The reference noise signal represents a reference position of the MR element with respect to the edge of the tape. For instance, if the integer is two the MR element is at its reference position when the edge of the tape bisects the width of the MR element. The magnitude of off tape noise power is directly related to the width of the MR element. Once the reference position is detected the MR element or a plurality of interconnected MR elements can be indexed to desired information or servo tracks on the magnetic tape.
摘要翻译：提供了一种磁带边缘检测器，其通过处理由MR元件完全关闭时由MR元件产生的噪声功率以及当MR元件完全在磁带上时产生的噪声功率来检测磁带的边缘。磁带噪声功率由MR元件和与其连接的电路固有的因素产生，而磁带噪声功率由于移动磁带和MR元件之间的摩擦而由MR元件的加热产生。除磁带噪声功率和磁带噪声功率之间的差除以大于1的整数以产生参考噪声信号。参考噪声信号表示MR元件相对于磁带边缘的参考位置。例如，如果整数为2，当磁带的边缘将MR元素的宽度平分时，MR元素处于其参考位置。磁带噪声功率的大小与MR元件的宽度直接相关。一旦检测到参考位置，MR元件或多个互连的MR元件就可被索引到磁带上的所需信息或伺服磁道上。

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