公开(公告)号：US20070206310A1

公开(公告)日：2007-09-06

申请号：US11733934

申请日：2007-04-11

申请人： ROBERT HUTCHINS ,  Glen Jaquette ,  Evangelos Eleftheriou ,  Sedat Oelcer

发明人： ROBERT HUTCHINS ,  Glen Jaquette ,  Evangelos Eleftheriou ,  Sedat Oelcer

IPC分类号： G11B5/035

CPC分类号： G11B20/10 ,  G11B5/02

摘要： A read channel equalizer of a magnetic tape drive which equalized digitally sampled magnetic signals detected by a read head is dynamically adapted. A detector of equalizer dynamic adaptation logic compares equalizer output signals to desired values that are based on the decoding scheme (such as +2, 0 and −2 for PR4) to sense equalizer output signals that are offset from at least one desired value, and signals the fact of each offset and it polarity as amplitude independent error signals. The signaled sensed amplitude independent error signals are fed back to adjustable taps of the equalizer. The simplified error signals thus avoid complex calculations of waveform errors, such as least mean square calculations. The error signals may be weighted and may be adjusted to align synchronously provided error signals with asynchronous taps of the equalizer.

摘要翻译： 驱动磁头驱动器的读取通道均衡器，其均衡由读取头检测到的数字采样的磁信号。 均衡器动态适配逻辑的检测器将均衡器输出信号与基于解码方案（例如PR4的+2,0和-2）的期望值进行比较，以感测与至少一个期望值偏移的均衡器输出信号，以及 将每个偏移的事实表示为与振幅无关的误差信号。 信号感知的与振幅无关的误差信号反馈到均衡器的可调节抽头。 因此，简化的误差信号避免了波形误差的复杂计算，例如最小均方根计算。 误差信号可以被加权并且可以被调整以使同步提供的误差信号与均衡器的异步抽头对齐。