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公开(公告)号：US08873176B1
公开(公告)日：2014-10-28
申请号：US13745069
申请日：2013-01-18
发明人： Hongwei Song , Ke Han , Michael Madden , Zining Wu
CPC分类号： G11B20/18 , G11B20/10009 , G11B20/10222 , G11B20/1037 , G11B20/10462 , G11B20/10509 , G11B2220/2516
摘要： A system for identifying and compensating for non-linear transition shift in a magnetic medium data storage device is disclosed. The non-linear transition shift compensation system includes a non-linear transition shift estimation module adapted to generate non-linear transition shift estimates for specific bit patterns. The system further includes a pre-compensation module adapted to adjust the temporal spacing of binary transitions written to the magnetic medium based on the non-linear transition shift estimates generated by the non-linear transition shift estimation module for specific bit patterns corresponding to bit patterns appearing in the data being written to the magnetic medium.
摘要翻译： 公开了一种用于识别和补偿磁介质数据存储装置中的非线性跃迁的系统。 非线性跃迁偏移补偿系统包括适于产生特定比特模式的非线性跃迁偏移估计的非线性跃迁偏移估计模块。 该系统还包括预补偿模块，其适于基于由非线性跃迁偏移估计模块针对与位模式对应的特定比特模式生成的非线性跃迁移位估计来调整写入到磁介质的二进制转换的时间间隔 出现在写入磁介质的数据中。
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22.发明授权Systems and methods for performing timing acquisition on an expected preamble of a read signal 有权用于对读取信号的预期前导码执行定时获取的系统和方法公开(公告)号：US08810938B1
公开(公告)日：2014-08-19
申请号：US14230720
申请日：2014-03-31
发明人： Michael Madden , Gregory Burd
IPC分类号： G11B5/02
CPC分类号： G11B20/10046 , G11B5/09 , G11B19/045 , G11B20/10222 , G11B20/1217
摘要： A system including a read/write channel module and a data processing module. The read/write channel module is configured to sample a read signal corresponding to data read from a disk. The data processing module is configured to determine a first track of the disk. A first preamble of the first track is encoded to include a first timing recovery pattern, a second preamble of a second track of the disk is encoded to include a second timing recovery pattern, and a first period of the first timing recovery pattern is different than a second period of the second timing recovery pattern. The data processing module is further configured to determine an expected preamble and process the read signal to remove inter track interference from the read signal based on the expected preamble and an expected difference between the first period and the second period.
摘要翻译： 一种包括读/写通道模块和数据处理模块的系统。 读/写通道模块被配置为对与从盘读取的数据相对应的读取信号进行采样。 数据处理模块被配置为确定盘的第一轨道。 第一轨道的第一前导码被编码为包括第一定时恢复模式，盘的第二轨道的第二前导码被编码为包括第二定时恢复模式，并且第一定时恢复模式的第一周期不同于 第二定时恢复模式的第二周期。 数据处理模块还被配置为基于预期的前导码和第一周期与第二周期之间的预期差异来确定预期的前同步码并处理读取信号以从读取信号中去除帧间干扰。
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公开(公告)号：US08730609B1
公开(公告)日：2014-05-20
申请号：US13683638
申请日：2012-11-21
发明人： Heng Tang , Yu-Yao Chang , Panu Chaichanavong , Michael Madden , Gregory Burd
CPC分类号： G11B20/10203 , G11B5/012 , G11B5/09 , G11B20/10018 , G11B20/10046 , G11B20/10268
摘要： A system including a first filter module and a second filter module. The first filter module is configured to (i) pass a first DC shift in an input signal and (ii) convert a second DC shift in the input signal to a first component and a second component. The first DC shift is shorter in duration than the second DC shift. The second filter module is configured to detect one or more of (i) the first DC shift and (ii) the first component and the second component of the second DC shift. In response to detecting one or more of (i) the first DC shift and (ii) the first component and the second component of the second DC shift, the second filter module is configured to filter one or more of (i) the first DC shift and (ii) the first component and the second component of the second DC shift.
摘要翻译： 一种包括第一过滤器模块和第二过滤器模块的系统。 第一滤波器模块被配置为（i）在输入信号中传递第一DC偏移，并且（ii）将输入信号中的第二DC移位转换为第一分量和第二分量。 持续时间的第一个直流偏移比第二个直流偏移更短。 第二滤波器模块被配置为检测（i）第一DC偏移和（ii）第二DC偏移的第一分量和第二分量中的一个或多个。 响应于检测（i）第一DC偏移和（ii）第二DC偏移的第一分量和第二分量中的一个或多个，第二过滤器模块被配置为过滤（i）第一DC 移动和（ii）第二DC移位的第一分量和第二分量。
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24.发明授权Viterbi decoder method and apparatus with RI detector in servo channel 有权维特比解码器方法和装置，其具有RI检测器在伺服信道中公开(公告)号：US08707147B1
公开(公告)日：2014-04-22
申请号：US13925581
申请日：2013-06-24
发明人： Zaihe Yu , Michael Madden
IPC分类号： H03M13/03
CPC分类号： G11B20/10212 , G11B20/10175 , G11B20/10222 , G11B20/10277 , G11B20/10398 , G11B20/20 , H03M13/3961 , H03M13/41 , H03M13/6343
摘要： Apparatus and methods are disclosed for decoding data stored on a data storage medium. A disclosed decoding method and decoder include a radial incoherence (RI) detector that increases the probability of detecting RI and improves the decoding performance in terms of the bit error rate of the decoded signal. RI is detected by comparing an input signal to the decoder against a RI threshold value and generating a RI-type signal. The RI detector may include a filter for filtering out noise and error in the RI-type signal, an adaptive threshold unit that adjusts the RI threshold value based upon the RI-type signal, a transition-based threshold unit that adjusts the RI threshold value based upon each transition in the input signal, or a path-based threshold unit that adjusts the RI threshold value based upon a best surviving path corresponding to the input signal, in combination or alone.
摘要翻译： 公开了用于对存储在数据存储介质上的数据进行解码的装置和方法。 所公开的解码方法和解码器包括径向不相干（RI）检测器，其增加检测RI的概率，并且根据解码信号的误码率提高解码性能。 通过将输入信号与解码器相对于RI阈值进行比较并产生RI型信号来检测RI。 RI检测器可以包括用于滤除RI型信号中的噪声和误差的滤波器，基于RI型信号调整RI阈值的自适应阈值单元，调整RI阈值的基于过渡的阈值单元 基于输入信号中的每个转换，或者基于路径的阈值单元，其组合地或组合地基于基于与输入信号对应的最佳幸存路径来调整RI阈值。
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