公开(公告)号：US07193802B2

公开(公告)日：2007-03-20

申请号：US10809230

申请日：2004-03-25

申请人： Roy D. Cideciyan ,  Ajay Dholakia ,  Evangelos S. Eleftheriou ,  Richard L. Galbraith ,  Weldon M. Hanson ,  Thomas Mittelholzer ,  Travis R. Oenning ,  Michael J. Ross ,  David J. Stanek

发明人： Roy D. Cideciyan ,  Ajay Dholakia ,  Evangelos S. Eleftheriou ,  Richard L. Galbraith ,  Weldon M. Hanson ,  Thomas Mittelholzer ,  Travis R. Oenning ,  Michael J. Ross ,  David J. Stanek

IPC分类号： G11B5/09 ,  G11B5/035 ,  H03K5/139

CPC分类号： G11B5/035

摘要： An apparatus for providing dynamic equalizer optimization is disclosed. The present invention solves the above-described problems by providing equalizer coefficient updates that converge towards the same solution as the direct method without having to first write a known pattern to the disk or requiring any prior knowledge of the data already written on the disk. The adaptive cosine function may be used to modify only a DFIR tap set, only the j and k parameters of a cosine equalizer or to modify both the tap set for a DFIR filter and the j and k parameters of the cosine equalizer. Another algorithm, such as the LMS algorithm, may be used to modify parameters not modified by the cosine algorithm.

摘要翻译： 公开了一种用于提供动态均衡器优化的装置。 本发明通过提供均衡器系数更新来解决上述问题，所述均衡器系数更新收敛于与直接方法相同的解决方案，而不必首先将已知模式写入盘或需要任何已经写入盘中的数据的任何知识。 自适应余弦函数可用于仅修改DFIR抽头集，仅修改余弦均衡器的j和k参数，或者修改DFIR滤波器的抽头集合和余弦均衡器的j和k参数。 可以使用诸如LMS算法的另一种算法来修改未被余弦算法修改的参数。

公开(公告)号：US5751769A

公开(公告)日：1998-05-12

申请号：US734879

申请日：1996-10-22

申请人： James Pressey ,  Richard Koralek ,  Francis J. Smith

发明人： James Pressey ,  Richard Koralek ,  Francis J. Smith

IPC分类号： H03H21/00 ,  H04L25/03 ,  H03H7/30 ,  H03K5/139

CPC分类号： H04L25/03044 ,  H03H21/0012

摘要： An equalizer that mitigates both linear and nonlinear distortions for amplitude phase keyed signals that are processed thereby. Algorithms employed in the equalizer are based on correcting received signals based on symbol transitions between successive symbols. The linear portion of the equalizer is programmable and can use any available algorithm. Programmable linear taps of the equalizer may be programmed in a nonlinear manner by using the lookup tables as amplitude dependent equalizers that are used to process one symbol at a time. In the equalizer, each amplitude level has it's own correction factor by using amplitude dependent coefficients. The equalizer can implement both linear and nonlinear equalization. Equalizer corrections are implemented using predetermined values stored in lookup tables. The equalization corrections are determined in an external computer and are loaded into the lookup tables for each amplitude level of the received signals. The equalizer is programmable and may be used with any amplitude phase keyed signal by reprogramming the lookup tables from the external computer for the desired modulation.

摘要翻译： 一种均衡器，用于减轻由此处理的幅度相位键控信号的线性和非线性失真。 在均衡器中使用的算法基于基于连续符号之间的符号转换校正接收信号。 均衡器的线性部分是可编程的，可以使用任何可用的算法。 均衡器的可编程线性抽头可以通过使用查找表作为用于一次处理一个符号的幅度相关均衡器以非线性方式编程。 在均衡器中，每个振幅电平通过使用幅度相关系数具有自己的校正因子。 均衡器可以实现线性和非线性均衡。 使用存储在查找表中的预定值来实现均衡器校正。 在外部计算机中确定均衡校正，并且对于接收信号的每个幅度电平将其加载到查找表中。 均衡器是可编程的，并且可以与任何幅度相位键控信号一起使用，通过从外部计算机重新编程查找表用于期望的调制。