公开(公告)号：US5583706A

公开(公告)日：1996-12-10

申请号：US341723

申请日：1994-11-17

申请人： Trent O. Dudley ,  William G. Gliss ,  Richard T. Behems ,  David R. Welland

发明人： Trent O. Dudley ,  William G. Gliss ,  Richard T. Behems ,  David R. Welland

IPC分类号： G11B19/04 ,  G11B20/10 ,  G11B20/14 ,  G11B5/09

CPC分类号： G11B20/10055 ,  G11B20/10009 ,  G11B20/10037 ,  G11B20/1403 ,  G11B19/04

摘要： In a sampled amplitude read channel for magnetic recording, a nonlinear discrete time decimation filter in a negative feed back loop adjusts a DC offset in an analog read signal from a magnetic read head without distorting the read signal. In sampled amplitude recording, adding the samples of an isolated positive pulse to the samples of an isolated negative pulse generates the DC offset of the discrete time sample values. A decimation filter adds the sample values from a positive pulse to the sample values of a negative pulse in order to detect and pass the DC offset in the read signal. The detected discrete time DC offset from the discrete time decimation filter is converted into an analog DC offset signal and subtracted from the analog read signal in a negative feedback loop. A running average decimation filter removes the DC offset during acquisition, and a decision-directed decimation filter removes the DC offset during tracking.

摘要翻译： 在用于磁记录的采样幅度读取通道中，负反馈回路中的非线性离散时间抽取滤波器调整来自磁读头的模拟读取信号中的DC偏移，而不会使读取信号失真。 在采样振幅记录中，将隔离的正脉冲的样本加到分离的负脉冲的采样中，产生离散时间采样值的直流偏移。 抽取滤波器将来自正脉冲的采样值与负脉冲的采样值相加，以便检测并通过读信号中的直流偏移。 从离散时间抽取滤波器检测到的离散时间直流偏移被转换为模拟直流偏移信号，并从负反馈回路中的模拟读取信号中减去。 运行平均抽取滤波器在采集期间去除DC偏移，并且决策导频抽取滤波器在跟踪期间去除DC偏移。