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1. 发明授权

US5734680A Analog implementation of a partial response maximum likelihood (PRML) read channel 失效
标题翻译：部分响应最大似然（PRML）读通道的模拟实现
公开(公告)号：US5734680A
公开(公告)日：1998-03-31
申请号：US513188
申请日：1995-08-09
申请人： Charles E. Moore , Richard A. Baumgartner , Travis N. Blalock , Thomas M. Walley , Robert A. Zimmer , Rajeev Badyal , Li Ching Tsai , Larry S. Metz , Sui-Hing Leung , James S. Ignowski , Kenneth R. Stafford , Ran-Fun Chiu , Richard A. Baugh
发明人： Charles E. Moore , Richard A. Baumgartner , Travis N. Blalock , Thomas M. Walley , Robert A. Zimmer , Rajeev Badyal , Li Ching Tsai , Larry S. Metz , Sui-Hing Leung , James S. Ignowski , Kenneth R. Stafford , Ran-Fun Chiu , Richard A. Baugh
IPC分类号： G11B5/09 , G11B20/10 , H04L5/12
CPC分类号： G11B5/09 , G11B20/10009
摘要： An analog, fully integrated, partial response maximum likelihood (PRML) read channel utilizing a high-performance analog delay line, an analog adaptive equalizer and an analog Viterbi detector is provided, resulting in saved space, performance gains, and lower power consumption. For signal detection and reconstruction used in read operations, the partial response maximum likelihood (PRML) read channel includes a variable gain amplifier coupled to a lowpass filter for input to an adaptive analog equalizer. The adaptive analog equalizer comprises an analog delay line and an analog feedforward equalizer (FFE). An analog Viterbi detector employs maximum-likelihood sequence estimation (MLSE) techniques to performs the signal detection function. A decoder/descrambler produces a final reconstructed signal. The analog implementation of a partial response maximum likelihood (PRML) read channel also includes a scrambler/encoder coupled to a write precompensation circuit for output to a separate write head.
摘要翻译：提供了利用高性能模拟延迟线的模拟，完全集成的部分响应最大似然（PRML）读取通道，模拟自适应均衡器和模拟维特比检测器，从而节省空间，提高性能并降低功耗。对于在读操作中使用的信号检测和重建，部分响应最大似然（PRML）读通道包括耦合到低通滤波器的可变增益放大器，用于输入到自适应模拟均衡器。自适应模拟均衡器包括模拟延迟线和模拟前馈均衡器（FFE）。模拟维特比检测器采用最大似然序列估计（MLSE）技术来执行信号检测功能。解码器/解扰器产生最终的重构信号。部分响应最大似然（PRML）读通道的模拟实现还包括耦合到写预补偿电路的加扰器/编码器，以输出到单独的写头。

2. 发明授权

US5150379A Signal processing system for adaptive equalization 失效
标题翻译：用于自适应均衡的信号处理系统
公开(公告)号：US5150379A
公开(公告)日：1992-09-22
申请号：US766692
申请日：1991-09-27
申请人： Richard A. Baugh , Ran-Fun Chiu , Darlene L. Hart , Merban Jam , Sui-hing Leung
发明人： Richard A. Baugh , Ran-Fun Chiu , Darlene L. Hart , Merban Jam , Sui-hing Leung
IPC分类号： G11B5/035 , G11B5/09 , G11B20/10 , G11B20/24 , H04L25/03
CPC分类号： H04L25/03057 , G11B20/10009 , G11B20/24 , G11B5/035 , G11B5/09 , H04L25/03114 , H04L2025/03369 , H04L2025/03496 , H04L2025/03617
摘要： Signal processing system for reducing error due to intersymbol interference and other noise, the system having a feedforward equalizer adaptively responsive to a first error signal (e.sub.n) and having a noise decorrelator adaptively responsive to an adjusting signal (q.sub.n) derived from the first error signal. In a preferred embodiment the source of the signal (S.sub.n) is a magnetic disk having encoded data thereon. The feedforward equalizer reduces intersymbol interference. A decision device connected to the feedforward equalizer is coupled to connect the signal (X.sub.n) from the feedforward equalizer into a stream (d.sub.n) of data samples having a limited number of predetermined signal levels. The first error signal is the difference between signal levels of data samples in the stream and the output of the feedforward equalizer. The first error signal is utilized to adjust the feedforward equalizer and to provide an input to the noise decorrelator. The noise decorrelator is an adaptive multi-tap assembly having a summing junction at the decorrelator output to provide a predicted noise signal (e.sub.pn) to the output signal of the feedforward equalizer. The adjusting signal which adaptively adjusts tap weights of the noise decorrelator is the difference between the first error signal and the predicted noise signal.

3. 发明授权

US5774505A Intersymbol interference cancellation with reduced complexity 失效
标题翻译：符号间干扰消除复杂度降低
公开(公告)号：US5774505A
公开(公告)日：1998-06-30
申请号：US628173
申请日：1996-04-04
申请人： Richard A. Baugh
发明人： Richard A. Baugh
IPC分类号： G11B5/09 , G11B20/10 , H04L25/03 , H03K5/12 , H04B3/14
CPC分类号： G11B20/10203 , H04L25/03834
摘要： A signal processing channel and method for reducing intersymbol interference in a sequence of data symbols includes a pre-shaping filter for sharpening leading edges of data symbols and providing trailing edges that approximate a decaying exponential. The output of the pre-shaping filter is combined with a cancellation output from a resistance-capacitance circuit having a time constant selected to provide pulse responses that complement the exponentially decaying trailing edges. The combination of the shaped output and the cancellation output is input to a slicer or other decision device. The 2-level output from the slicer is an input to a decision feedback filter that generates the cancellation output. In addition to the resistance-capacitance circuit, the decision feedback filter includes a delay to properly time the coincidence of the cancellation output with the shaped output from the pre-shaping filter. Preferably, the signal processing channel and method include a gain circuit for setting the peaks of the shaped signals and include adaptive adjustment of the gain, the sharpening by the pre-shaping filter, and the RC time constant of the decision feedback filter.
摘要翻译：用于减少数据符号序列中的符号间干扰的信号处理信道和方法包括用于锐化数据符号的前沿并提供近似衰减指数的后沿的预整形滤波器。预成形滤波器的输出与具有选择的时间常数的电阻 - 电容电路的抵消输出组合，以提供补偿指数衰减后沿的脉冲响应。成形输出和抵消输出的组合被输入到切片器或其他判定装置。来自分片器的2电平输出是产生消除输出的判决反馈滤波器的输入。除了电阻电容电路之外，判决反馈滤波器还包括一个延迟，以便适当地将取消输出与预成形滤波器的成形输出的一致性时间。优选地，信号处理通道和方法包括用于设置成形信号的峰值的增益电路，并且包括增益的自适应调整，预整形滤波器的锐化以及判决反馈滤波器的RC时间常数。

4. 发明授权

US4729045A Apparatus and method for digital magnetic recording and reading 失效
标题翻译：用于数字磁记录和读取的装置和方法
公开(公告)号：US4729045A
公开(公告)日：1988-03-01
申请号：US847089
申请日：1986-04-01
申请人： Richard A. Baugh
发明人： Richard A. Baugh
IPC分类号： G11B20/10 , G11B20/18 , G11B5/09
CPC分类号： G11B20/1879 , G11B20/10009
摘要： Magnetic recording and reading apparatus and a method in which two modes of operation, read-after-write and read-only, for setting read signal amplitude qualification threshold are provided. In the read-after-write mode, a fixed amplitude qualification threshold is utilized, typically being fifty percent of the peak amplitude of a perfect dropout-free read signal. The read-only mode amplitude qualification threshold is derived from the average peak rectified read signal, and varies with it. The threshold is selected to provide that fraction of the average peak rectified read signal which gives the lowest acceptable dropout or error rate.
摘要翻译：磁记录和读取装置以及用于设置读信号幅度限定阈值的两种操作模式，只读写操作和只读方式。在写后读取模式中，利用固定幅度限定阈值，通常为完全无差错读信号的峰值幅度的百分之五十。只读模式振幅限定阈值是从平均峰值整流读出信号导出的，随之而变化。选择阈值以提供平均峰值整流读取信号的分数，其给出最低可接受的丢失或错误率。

5. 发明授权

US3953840A Magneto resistive bubble detection device 失效
标题翻译：磁电阻气泡检测装置
公开(公告)号：US3953840A
公开(公告)日：1976-04-27
申请号：US469169
申请日：1974-05-13
申请人： Leonard S. Cutler , Richard A. Baugh
发明人： Leonard S. Cutler , Richard A. Baugh
IPC分类号： G11C11/14 , G01R33/09 , G11C19/08
CPC分类号： G11C19/0866 , G01R33/09
摘要： A differential detection device is provided for detecting the presence of magnetic bubbles in a data stream circulating on a magnetic wafer. The device utilizes an array of columns of permalloy elements to enlarge the magnetic bubbles being detected. A change in resistance of each of a pair of adjacent permalloy columns as a bubble traverses the detector is sensed and differentially detected to signify the presence of the bubble. In one embodiment of the invention, a second detector is used in conjunction with the first detector to provide operation in a mode in which bubbles in alternate positions in the data stream are directed into alternate channels including the first and second detectors respectively. After detection, the bubbles are redirected into a single data stream, while the output signals from the two detectors are merged to produce a data output signal reproducing the original data stream.
摘要翻译：提供差分检测装置，用于检测在磁性晶片上循环的数据流中的磁性气泡的存在。该装置利用坡莫合金元素的列阵列来扩大被检测的磁气泡。感测并差异地检测作为气泡的一对相邻坡莫合金列中的每一个的电阻的变化以表示气泡的存在。在本发明的一个实施例中，第二检测器与第一检测器结合使用以在数据流中交替位置中的气泡分别引导到包括第一和第二检测器的交替通道的模式中提供操作。在检测之后，气泡被重定向到单个数据流，而来自两个检测器的输出信号被合并以产生再现原始数据流的数据输出信号。

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