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1. 发明授权

US4125881A Tape motion control for reel-to-reel drive 失效
标题翻译：卷轴到卷轴驱动的胶带运动控制
公开(公告)号：US4125881A
公开(公告)日：1978-11-14
申请号：US798539
申请日：1977-05-19
申请人： John J. Eige , Arvind M. Patel , Spencer D. Roberts , David Stedman
发明人： John J. Eige , Arvind M. Patel , Spencer D. Roberts , David Stedman
IPC分类号： G11B15/43 , B65H23/18 , G11B15/46 , G11B15/48 , G11B15/54 , G11B27/13 , G11B5/09 , G03B1/04
CPC分类号： G11B15/48 , G11B15/54 , G11B27/13 , G11B2220/90
摘要： High tape acceleration rates are achieved in an unbuffered, capstanless tape drive system by a tape motion control apparatus employing separate drive motors for each reel of a reel-to-reel tape transport. Tape moves from one reel past a read/write head and a tape tension sensor to the other reel, there being no tachometer in the tape feed path. A tachometer on one reel shaft provides a large number of pulses per revolution which pulses are counted by a counter; and a tachometer on the other reel shaft provides only one pulse per revolution, which pulse gates out the count then accumulated in the counter for actuating means to provide motor acceleration currents of a magnitude corresponding to said accumulated count according to a predetermined servo algorithm for controlling rotation of both reels. A tape radius constant corresponding to the actual length and thickness of tape in the system is calculated during initial wrap of tape onto the takeup reel. Tension is tightly controlled by an analog tension sensor and servo system.
摘要翻译：通过带式运动控制装置在无缓冲的无卷轴磁带驱动系统中实现高的磁带加速速率，该磁带运动控制装置对于卷轴到卷轴磁带传输的每个卷轴使用单独的驱动马达。磁带从一个卷轴移动通过读/写头和磁带张力传感器到另一卷轴，磁带馈送路径中没有转速表。一个卷轴上的转速表每转提供大量脉冲，这些脉冲由计数器计数; 而另一个卷轴上的转速表仅提供每转一个脉冲，该脉冲将计数累加在计数器中，用于致动装置，以根据预定的伺服算法提供对应于所述累加计数的电动机加速电流，以控制两个卷轴的旋转。在将带子初始卷绕到收紧卷轴上时，计算对应于系统中的带的实际长度和厚度的带半径常数。张力由模拟张力传感器和伺服系统严格控制。

2. 发明授权

US5491698A Setting optimal boundary thresholds in a decoder for coded signal processing channels 失效
标题翻译：在编码信号处理通道的解码器中设置最优边界阈值
公开(公告)号：US5491698A
公开(公告)日：1996-02-13
申请号：US169817
申请日：1993-12-16
申请人： Arvind M. Patel , Robert A. Rutledge , Bum S. So
发明人： Arvind M. Patel , Robert A. Rutledge , Bum S. So
IPC分类号： G06F11/08 , G11B20/10 , G11B20/14 , G11B20/18 , H03M7/14 , H03M13/00
CPC分类号： G11B20/10009 , G11B20/1426
摘要： To improve data detection reliability in a coded maximum likelihood signal processing channel, two counters count the number of times actual values of linear functions of digital sample values corresponding to one and another preselected data patterns are within m units above and m units below, respectively, a preselected decision boundary used to determine whether detected data corresponding to a coded sequence of runlength limited code is a "1" or a "0". A difference count has a magnitude and sign denoting difference between counts in the two counters. After N occurrences of each preselected data pattern irrespective of how far from the boundary, the boundary is adjusted upwardly or downwardly, provided the difference count at least equals +S or at most -S, respectively.
摘要翻译：为了提高编码最大似然信号处理通道中的数据检测可靠性，两个计数器计数对应于一个和另一个预选数据模式的数字样本值的线性函数的实际值分别在m单位以内和m单位以下的次数，用于确定与游程受限码的编码序列相对应的检测数据是“1”还是“0”的预选判定边界。差异计数具有表示两个计数器中的计数之间的差异的幅度和符号。在每次预先选择的数据模式发生N次之后，如果差值计数至少等于+ S或至多-S，则该边界被向上或向下调整。

3. 发明授权

US5353170A Error recovery data storage system and method with two position read verification 失效
标题翻译：错误恢复数据存储系统和方法具有两个位置读取验证
公开(公告)号：US5353170A
公开(公告)日：1994-10-04
申请号：US64297
申请日：1993-05-19
申请人： Kwok W. Fung , Robert L. Kwok , Arvind M. Patel , Robert A. Rutledge
发明人： Kwok W. Fung , Robert L. Kwok , Arvind M. Patel , Robert A. Rutledge
IPC分类号： G11B5/09 , G11B5/012 , G11B19/04 , G11B20/18 , G11B5/584
CPC分类号： G11B5/012 , G11B19/04
摘要： A direct access storage device (DASD) system uses a read/write head having a wide transducer write element and a narrow magneto-resistive read element. In order to avoid mistakenly reading a incompletely erased old data field, the system uses a verification procedure. Data are read at two positions along the data track which are separated by a radial distance D. This distance D is selected to be greater than the width of any incompletely erased data record. If the data read at the two read positions are equal, then the data are deemed to be correct and are sent to a host system.
摘要翻译：直接访问存储设备（DASD）系统使用具有宽的换能器写入元件和窄的磁阻读取元件的读/写头。为了避免错误地读取不完全清除的旧数据字段，系统使用验证过程。在数据轨道的两个位置上读取数据，这两个位置被径向距离D分隔。该距离D被选择为大于任何不完全擦除的数据记录的宽度。如果在两个读取位置读取的数据相等，则认为数据是正确的，并被发送到主机系统。

4. 发明授权

US5282216A High data rate decoding method for coding signal processing channels 失效
标题翻译：用于编码信号处理通道的高数据速率解码方法
公开(公告)号：US5282216A
公开(公告)日：1994-01-25
申请号：US920027
申请日：1992-07-27
申请人： Arvind M. Patel , Robert A. Rutledge , Bum S. So
发明人： Arvind M. Patel , Robert A. Rutledge , Bum S. So
IPC分类号： G11B20/18 , G11B5/09 , G11B20/10 , G11B20/14 , H03M13/00
CPC分类号： G11B20/10009
摘要： A method for processing, in a signal processing channel, digital values corresponding to a digitized incoming analog signal representative of coded binary data. A state-dependent sequence detection algorithm includes two groups of appropriate functional expressions of digital sample values, which expressions are identical but offset one sample position from each other. During each iterating step with successive pairs of clock cycles, the value of each expression in the two groups of expressions is precomputed from a preselected number of sample values ahead of a then current sample value; preselected ones of these expression values are compared against an appropriate threshold, which is the same for corresponding expressions of each group, to provide respective binary decision outputs corresponding to each of the two groups; and the current state value then advances to two next successive state values. A pipelined configuration is utilized in which a different number of sample values, greater than said preselected number, is used ahead of the current sample value to allow sufficient time for precomputing said groups of expressions.
摘要翻译：一种用于在信号处理通道中处理与代表二进制数据的数字化输入模拟信号相对应的数字值的方法。状态依赖的序列检测算法包括数字样本值的两组适当的功能表达式，这些表达式是相同的，但彼此偏移一个样本位置。在具有连续的时钟周期对的每个迭代步骤期间，两组表达式中的每个表达式的值从当前样本值之前的预选数量的样本值预先计算; 将这些表达值中的预选择的值与对每个组的相应表达式相同的适当阈值进行比较，以提供对应于两组中的每一个的相应二进制判定输出; 并且当前状态值然后前进到两个下一个连续的状态值。使用流水线配置，其中在当前采样值之前使用大于所述预选数量的不同数量的采样值，以允许足够的时间预先计算所述表达组。

5. 发明授权

US5430745A Prejudging current state in a decoder for coded signal processing channels 失效
标题翻译：对解码器中的编码信号处理通道进行预判定
公开(公告)号：US5430745A
公开(公告)日：1995-07-04
申请号：US198202
申请日：1994-02-17
申请人： Arvind M. Patel , Robert A. Rutledge , Bum S. So
发明人： Arvind M. Patel , Robert A. Rutledge , Bum S. So
IPC分类号： G11B20/10 , G11B20/14 , H03M5/14 , G06F11/10
CPC分类号： G11B20/1426 , G11B20/10009 , H03M5/145
摘要： Decoder for processing digital sample values corresponding to an incoming read signal representative of coded binary data. Functional expressions of digital sample values are precomputed for a preselected number of sample values ahead of a current sample value. To provide binary decision outputs, preselected functional expressions are compared against binary representations of corresponding thresholds that are conditioned by the sign of a selected functional expression comprising at least one preselected digital sample value. These outputs, the sign of the selected functional expression, the current value and previous value of decoded data, and the current value of detected phase, are all used to determine the next value of decoded data and next value of detected phase. These next values become the current values of decoded data and detected phase for the next clock cycle. The binary representations input to the comparators and the binary decision outputs of the comparators are inverted only if the selected functional expression has a preselected sign.
摘要翻译：解码器，用于处理对应于代表编码二进制数据的传入读取信号的数字样本值。数字样本值的功能表达式预先计算出当前样本值之前的预选数量的样本值。为了提供二进制判决输出，将预选的功能表达式与由包括至少一个预选数字样本值的所选功能表达式的符号调节的对应阈值的二进制表示进行比较。这些输出，所选功能表达式的符号，解码数据的当前值和先前值以及检测相位的当前值都用于确定解码数据的下一个值和检测相位的下一个值。这些下一个值将成为下一个时钟周期的解码数据和检测相位的当前值。输入到比较器的二进制表示和比较器的二进制判定输出仅在所选择的功能表达式具有预选符号时被反转。

6. 发明授权

US4804959A Method and apparatus using multiple codes to increase storage capacity 失效
标题翻译：使用多个代码来增加存储容量的方法和装置
公开(公告)号：US4804959A
公开(公告)日：1989-02-14
申请号：US119010
申请日：1987-11-10
申请人： Tarek Makansi , Constantin M. Melas , Arvind M. Patel , Steven H. Souther
发明人： Tarek Makansi , Constantin M. Melas , Arvind M. Patel , Steven H. Souther
IPC分类号： G11B5/09 , G11B5/012 , G11B20/10 , G11B20/14 , H03M7/00
CPC分类号： G11B5/012 , G11B20/10
摘要： To increase storage capacity of a disk storage device, the recording surface of the device is partitioned into a plurality of concentric recording bands, data to be recorded on respective bands are encoded using different run-length-limited codes with the code rate of each band being higher than the adjacent inner band.

7. 发明授权

US4504948A Syndrome processing unit for multibyte error correcting systems 失效
标题翻译：用于多字节纠错系统的综合征处理单元
公开(公告)号：US4504948A
公开(公告)日：1985-03-12
申请号：US454392
申请日：1982-12-29
申请人： Arvind M. Patel
发明人： Arvind M. Patel
IPC分类号： G06F11/10 , G11B20/18 , H03M13/00 , H03M13/15
CPC分类号： H03M13/151 , G11B20/1833
摘要： A syndrome processing unit for a multibyte error correcting system is disclosed in which logical circuitry for performing product operation on selected pairs of 8-bit syndrome bytes and exclusive-OR operations on selected results of the product operations are selectively combined to define usable cofactors that correspond to coefficients of an error locator polynomial corresponding to a selected codeword if the codeword contains less than the maximum number of errors for which the system has been designed.
摘要翻译：公开了一种用于多字节纠错系统的校正子处理单元，其中选择性地组合用于对所选择的8位校正子字对进行产品操作的逻辑电路和对产品操作的选定结果的异或运算，以定义可对应的辅因子如果码字包含小于系统设计的错误的最大数量，则对应于所选择的码字的错误定位器多项式的系数。

8. 发明授权

US4358848A Dual function ECC system with block check byte 失效
标题翻译：双功能ECC系统，具有块检查字节
公开(公告)号：US4358848A
公开(公告)日：1982-11-09
申请号：US206778
申请日：1980-11-14
申请人： Arvind M. Patel
发明人： Arvind M. Patel
IPC分类号： G06F11/10 , G06F12/16 , H03M13/00
CPC分类号： G06F11/1028
摘要： An improved ECC method and system are disclosed for correcting either a random single-bit error, or alternately, a multi-bit error in one byte of a data word from a single syndrome byte. The improvement involves determining the location of the multi-bit error in successive data words which result because of a failure in one of a plurality of failure independent storage units employed for storing a block of multi-byte words.The location of the defective byte position is determined by summing each non-zero syndrome byte that is developed for each multi-byte word that is processed to produce a summed syndrome byte .SIGMA.S.noteq.0. This summed syndrome byte is then employed to generate a set of vectors which are positionally related in an m-sequence to the summed syndrome byte. A block syndrome byte, developed during the processing of a number of words and representing the sum modulo-2 of the error pattern in each word of the block, is compared to each of the set of vectors. The position of the vector relative to the summed syndrome byte compared to the block syndrome byte then provides an indication of the byte position in each word which is in error. With the defective byte position identified, the individual syndrome bytes for each word are then employed to develop for each word the correct error pattern for the defective byte position of each word.
摘要翻译：公开了一种改进的ECC方法和系统，用于从单个校正子字节校正数据字的一个字节中的随机单位错误或者替代地，多位错误。改进涉及确定连续数据字中的多位错误的位置，这是由于用于存储多字节字的块的多个故障独立存储单元中的一个故障导致的。有缺陷的字节位置的位置由对被处理的每个多字节字开发的每个非零校正子字符求和，以产生一个相加的校正子字符SIGMA S NOTEQUAL0来确定。然后使用该求和的校正子字节来生成在m序列中位置相关的向量集合到求和的校验子字节。在处理多个字期间形成并且表示块的每个单词中的误差模式的和模2的积分块字节与该矢量集合中的每一个进行比较。与块综合征字节相比，向量相对于求和的字符串的位置然后提供错误的每个字中的字节位置的指示。在识别出有缺陷的字节位置的情况下，然后使用每个单词的单个校正子字节来为每个单词形成每个单词的缺陷字节位置的正确错误模式。

9. 发明授权

US4205324A Methods and means for simultaneously correcting several channels in error in a parallel multi channel data system using continuously modifiable syndromes and selective generation of internal channel pointers 失效
标题翻译：在使用连续可修改的综合征并选择性生成内部通道指针的并行多通道数据系统中同时校正多个通道错误的方法和装置
公开(公告)号：US4205324A
公开(公告)日：1980-05-27
申请号：US884463
申请日：1978-03-07
申请人： Arvind M. Patel
发明人： Arvind M. Patel
IPC分类号： G11B20/18 , G06F11/12
CPC分类号： H03M13/1162 , G11B20/1833
摘要： An apparatus for simultaneously correcting several channels in error is combined with a parallel multi channel data handling system. The apparatus encodes and records vertical parity checks in a first channel and encodes and records parity checks in a second and third channel or equivalent taken over the channels in respective predetermined positively and negatively sloped directions.Upon readback, syndromes from the parity checks and the recorded data are obtained. Correction signals from at least two syndromes intersecting the same error in a known channel in error are formed. The values of the syndromes diagonally intersecting each error in the known channel are continuously modified as the error is detected by inversion of the simple parity. Correction is attained by logically combining the correction signals with the original known channel in error data.Internal pointers to either first or subsequent channels in error are generated as a function of the bit position displacement in the in-channel direction between the occurrence of first and subsequent mismatches of vertical and diagonal syndromes. Internal pointers are generated either in the absence of or to supplement any external pointers.
摘要翻译：用于同时纠正错误的多个信道的装置与并行多信道数据处理系统组合。该装置对第一信道中的垂直奇偶校验进行编码和记录，并在相应的预定的正和负斜率方向上对通道上的第二和第三信道或等效物进行奇偶校验的编码和记录。在回读时，获得来自奇偶校验的综合征和记录的数据。形成来自在已知通道中与相同误差相交错误的至少两个综合征的校正信号。当通过简单奇偶校验的反转检测出错误时，连续地修改与已知通道中的每个错误对角地相交的综合征的值。通过将校正信号与错误数据中的原始已知通道逻辑组合来获得校正。作为错误的第一个或后续通道的内部指针是根据垂直和对角线综合征的第一个和后续的错配的发生之间的通道内方向上的位位置位移产生的。内部指针是在没有或补充任何外部指针的情况下生成的。

10. 再颁专利

USRE30187E Plural channel error correcting apparatus and methods 失效
标题翻译：多通道纠错装置及方法
公开(公告)号：USRE30187E
公开(公告)日：1980-01-08
申请号：US771042
申请日：1977-02-22
申请人： Se J. Hong , Arvind M. Patel
发明人： Se J. Hong , Arvind M. Patel
IPC分类号： G11B20/18
CPC分类号： G11B20/1833
摘要： Error correcting apparatus is provided for correcting plural channels in error in a parallel channel information system. The information is encoded in a cross-channel direction as well as along the channel length. The encoded message after storage or transmission is decoded in the cross-channel direction and error correction provided in the in-channel direction in a given number of indicated channels. Orthogonally symmetrical redundancy enhances error correction while tending to minimize hardware. Plural independent codes interact to correct the plural channels in error. The error correcting capabilities of the codes may be matched, no limitation thereto intended.

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