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    16-state adaptive noise predictive maximum-likelihood detection system
    23.
    发明授权
    16-state adaptive noise predictive maximum-likelihood detection system 失效
    16状态自适应噪声预测最大似然检测系统

    公开(公告)号：US08077764B2

    公开(公告)日：2011-12-13

    申请号：US12360777

    申请日：2009-01-27

    申请人： Evangelos S. Eleftheriou ,  Robert A. Hutchins ,  Sedat Oelcer

    发明人： Evangelos S. Eleftheriou ,  Robert A. Hutchins ,  Sedat Oelcer

    IPC分类号： H03H7/30

    CPC分类号： H04L25/03299 ,  H04L25/03197 ,  H04L2025/03617

    摘要： A 16-State adaptive NPML detector is provided for a tape drive which addresses weaknesses of a conventional fixed, 8-state EPR4 detector. Rather than having a fixed target channel, the detector is programmable to allow a range of target channels and can support “classical” partial response channels such as PR4 or EPR4 by programming predictor or whitening filter coefficients. In one embodiment, two filter coefficients may be set via XREG inputs or dynamically determined through the use of an LMS algorithm allowing the detector to adapt the predictor coefficients as data is being read. Another embodiment provides a detector for an EPR4 target in which the whitening filter has one coefficient. Components of the detection system include the detector itself, an LMS engine, a coefficient engine and a noise predictive or whitening filter. Coefficients from the LMS engine may be loaded or stored dynamically based upon conditions in the tape drive.

    摘要翻译： 为磁带驱动器提供了16状态自适应NPML检测器，其解决了常规固定的8状态EPR4检测器的缺点。 不是具有固定的目标通道，检测器可编程以允许一定范围的目标通道，并且可以通过编程预测器或白化滤波器系数来支持“经典​​”部分响应通道，例如PR4或EPR4。 在一个实施例中，可以经由XREG输入来设置两个滤波器系数，或者通过使用LMS算法动态地确定，允许检测器在正在读取数据时调整预测器系数。 另一个实施例提供了一种用于EPR4目标的检测器，其中白化滤波器具有一个系数。 检测系统的组件包括检测器本身，LMS引擎，系数引擎和噪声预测或增白滤波器。 可以根据磁带驱动器中的条件动态地加载或存储来自LMS引擎的系数。

    Least mean square (LMS) engine for multilevel signal
    26.
    发明授权
    Least mean square (LMS) engine for multilevel signal 有权
    用于多电平信号的最小均方（LMS）引擎

    公开(公告)号：US08040943B1

    公开(公告)日：2011-10-18

    申请号：US11724817

    申请日：2007-03-15

    申请人： Joseph N. Babanezhad

    发明人： Joseph N. Babanezhad

    IPC分类号： H03H7/30

    CPC分类号： H04B3/238 ,  H04B3/235 ,  H04L25/03012 ,  H04L25/061 ,  H04L27/06 ,  H04L2025/0349 ,  H04L2025/03617

    摘要： A method and an apparatus for slicing a multilevel analog signal using a two-level slicer having one threshold level to generate an analog error signal. The method may be performed by delaying a received multilevel analog signal in a plurality of serial analog stages (n), further delaying a multilevel analog signal tapped from stage n, combining the further delayed signal from stage n with an analog error signal e(t) to provide an analog weighting function Wn, wherein the combining of the delayed signal from stage n with Wn results in a plurality of signals XnWn, summing the plurality of signals XnWn, slicing a multilevel analog signal resulting from the summing of the plurality of signals XnWn using one threshold level to generate the analog error signal e(t), and combining the delayed signal from stage n with Wn.

    摘要翻译： 一种使用具有一个阈值电平的二电平限幅器对多电平模拟信号进行分片以产生模拟误差信号的方法和装置。 该方法可以通过在多个串行模拟级（n）中延迟所接收的多电平模拟信号，进一步延迟从级n抽头的多电平模拟信号，将来自级n的进一步延迟的信号与模拟误差信号e（t ）以提供模拟加权函数Wn，其中来自级n的延迟信号与Wn的组合产生多个信号XnWn，对多个信号XnWn进行求和，将由多个信号求和得到的多电平模拟信号 XnWn使用一个阈值电平来产生模拟误差信号e（t），并将来自阶段n的延迟信号与Wn组合。