专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US07944639B1 Disk drive adapting equalizer relative to bit error rate of sequence detector 有权
标题翻译：磁盘驱动器适应均衡器相对于序列检测器的误码率
公开(公告)号：US07944639B1
公开(公告)日：2011-05-17
申请号：US12178430
申请日：2008-07-23
申请人： Alvin J. Wang
发明人： Alvin J. Wang
IPC分类号： G11B5/53 , G11B5/09
CPC分类号： G11B20/10009 , G11B20/10046 , G11B20/10064 , G11B20/10074 , G11B20/10175 , G11B20/10296 , G11B20/10379 , G11B20/10462 , G11B20/10509 , G11B2220/2516
摘要： A disk drive is disclosed comprising a disk and a head actuated radially over the disk, wherein the head generates a read signal. A sampling device samples the read signal to generate a sequence of read signal samples, and an equalizer comprising a plurality of coefficients, equalizes the read signal samples to generate a sequence of equalized samples. A sequence detector detects an estimated data sequence from the equalized samples, wherein the sequence detector operates according to a target response comprising a plurality of target values. Control circuitry adapts the equalizer coefficients by computing error values in response to a difference between expected samples and the equalized samples, computing a gradient in response to a correlation of the read signal samples with the error values, and adjusting at least one of the equalizer coefficients in response to the gradient.
摘要翻译：公开了一种磁盘驱动器，包括盘和径向地在盘上致动的磁头，其中磁头产生读取信号。采样设备对读取信号进行采样以产生读取信号采样序列，并且包括多个系数的均衡器对均衡的采样信号进行均衡以产生均衡采样序列。序列检测器从均衡样本检测估计数据序列，其中序列检测器根据包括多个目标值的目标响应进行操作。控制电路通过响应于预期样本和均衡样本之间的差计算误差值来适应均衡器系数，响应于读取信号样本与误差值的相关性计算梯度，以及调整均衡器系数中的至少一个响应梯度。

2. 发明授权

US07990648B1 Disk drive margining read channel using predictable disturbance samples generated as a function of a written pattern 有权
标题翻译：磁盘驱动器利用作为写入模式的函数生成的可预测的干扰样本来限制读取通道
公开(公告)号：US07990648B1
公开(公告)日：2011-08-02
申请号：US12634506
申请日：2009-12-09
申请人： Alvin J. Wang
发明人： Alvin J. Wang
IPC分类号： G11B5/035
CPC分类号： G11B5/455 , G11B19/048 , G11B20/10009 , G11B20/10361 , G11B2020/1836 , G11B2020/185 , G11B2220/2516
摘要： A disk drive is disclosed comprising a head actuated over a disk having a plurality of tracks. A pattern is read from the disk to generate a read signal, and the read signal is sampled to generate read samples. Predictable disturbing samples are generated as a function of the pattern. The predictable disturbing samples are added to the read samples to generate disturbed samples, and a data sequence is detected from the disturbed samples.
摘要翻译：公开了一种磁盘驱动器，包括在具有多个轨道的盘上致动的磁头。从盘读取模式以产生读取信号，并且读取信号被采样以产生读取样本。作为图案的函数产生可预测的干扰样本。将可预测的干扰样本添加到读取样本中以产生干扰的样本，并且从受扰样品中检测数据序列。

3. 发明授权

US08589773B1 Disk drive margining read channel by biasing log-likelihood ratios of an iterative decoder 失效
标题翻译：通过偏置迭代解码器的对数似然比，磁盘驱动器保持读取通道
公开(公告)号：US08589773B1
公开(公告)日：2013-11-19
申请号：US12641899
申请日：2009-12-18
申请人： Alvin J. Wang , Patrick J. Lee , Manmohan K. Sharma
发明人： Alvin J. Wang , Patrick J. Lee , Manmohan K. Sharma
IPC分类号： H03M13/03
CPC分类号： H03M13/6583 , G11B20/1833 , G11B2020/1863 , H03M13/2957 , H03M13/6343 , H03M13/658
摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks. A read signal emanating from the head is sampled to generate read samples, and first log-likelihood ratios (LLRs) are generated in response to the read samples. The first LLRs are biased to generate biased LLRs, and the biased LLRs are decoded into a data sequence, wherein the biased LLRs increase an error rate of the data sequence.
摘要翻译：公开了一种磁盘驱动器，包括在包括多个数据磁道的磁盘上启动的磁头。从头部发出的读取信号被采样以产生读取样本，并且响应于读取的样本产生第一对数似然比（LLR）。第一LLR被偏置以产生偏置的LLR，并且偏置的LLR被解码成数据序列，其中偏置的LLR增加数据序列的错误率。

4. 发明授权

US08625225B1 Disk drive compensating for asymmetry of magnetoresistive read element 失效
标题翻译：补偿磁阻读取元件不对称的磁盘驱动器
公开(公告)号：US08625225B1
公开(公告)日：2014-01-07
申请号：US13220507
申请日：2011-08-29
申请人： Alvin J. Wang
发明人： Alvin J. Wang
IPC分类号： G11B5/09 , G11B5/035
摘要： A disk drive is disclosed comprising a head actuated over a disk, the head comprising a magnetoresistive (MR) read element. An analog read signal emanating from the MR read element is amplified to generate an amplified analog read signal. The amplified analog read signal is filtered in continuous-time to extract a dc component. An amplitude of the amplified analog read signal is measured in continuous-time, and an asymmetry in the amplified analog read signal is estimated in response to the dc component and the amplitude. The amplified analog read signal is modified in response to the estimated asymmetry to generate a compensated analog read signal.
摘要翻译：公开了一种磁盘驱动器，包括在盘上致动的磁头，磁头包括磁阻（MR）读取元件。从MR读取元件发出的模拟读取信号被放大以产生放大的模拟读取信号。放大的模拟读取信号被连续过滤以提取直流分量。以连续时间测量放大的模拟读取信号的幅度，并且响应于直流分量和振幅来估计放大的模拟读取信号的不对称性。响应于估计的不对称性来修改放大的模拟读取信号以产生经补偿的模拟读取信号。

5. 发明授权

US08201066B1 Disk drive comprising a trellis detector having a read signal whitener in the ACS circuit 有权
标题翻译：磁盘驱动器包括在ACS电路中具有读信号增白器的网格检测器
公开(公告)号：US08201066B1
公开(公告)日：2012-06-12
申请号：US12058540
申请日：2008-03-28
申请人： Alvin J. Wang
发明人： Alvin J. Wang
IPC分类号： G06F11/00
CPC分类号： G11B20/10268 , G11B20/10296 , G11B20/10509
摘要： A disk drive is disclosed comprising a disk, a head actuated over the disk to generate a read signal, and a trellis detector for detecting an estimated data sequence from the read signal. The trellis detector comprises a sampling device operable to sample the read signal to generate a sequence of signal sample values, and a plurality of add/compare/select (ACS) circuits each corresponding to a state in a trellis. Each ACS circuit comprises a first and second branch metric calculators for computing first and second branch metrics in response to first and second errors adjusted in response to first and second deltas that compensate for a distortion in the read signal.
摘要翻译：公开了一种磁盘驱动器，其包括盘，在盘上致动以产生读取信号的磁头，以及用于根据读取信号检测估计数据序列的网格检测器。网格检测器包括采样装置，其可操作以对读取信号进行采样以产生一系列信号样本值，以及多个加法/比较/选择（ACS）电路，每个对应于网格中的状态。每个ACS电路包括第一和第二分支度量计算器，用于响应于补偿读取信号中的失真的第一和第二增量而调整的第一和第二误差来计算第一和第二分支量度。

6. 发明授权

US07898756B1 Disk drive adapting target values of a sequence detector relative to bit error rate of the sequence detector 有权
标题翻译：磁盘驱动器适应序列检测器相对于序列检测器的误码率的目标值
公开(公告)号：US07898756B1
公开(公告)日：2011-03-01
申请号：US12178474
申请日：2008-07-23
申请人： Alvin J. Wang
发明人： Alvin J. Wang
IPC分类号： G11B5/09
CPC分类号： G11B5/09 , G11B20/10046 , G11B20/10212
摘要： A disk drive is disclosed comprising a disk and a head actuated radially over the disk, wherein the head generates a read signal. A sampling device samples the read signal to generate a sequence of read signal samples when reading a training data sequence recorded on the disk, and an equalizer comprising a plurality of coefficients equalizes the read signal samples to generate a sequence of equalized samples. A sequence detector detects an estimated data sequence from the equalized samples, wherein the sequence detector operates according to a target response comprising a plurality of target values. Control circuitry adapts the target values by computing error values in response to a difference between expected samples and the equalized samples, computing a gradient in response to a correlation of the training data sequence with the error values, and adjusting at least one of the target values in response to the gradient.
摘要翻译：公开了一种磁盘驱动器，包括盘和径向地在盘上致动的磁头，其中磁头产生读取信号。当读取记录在盘上的训练数据序列时，采样装置对读取信号进行采样以产生读取信号样本序列，并且包括多个系数的均衡器均衡读取信号样本以产生均衡样本序列。序列检测器从均衡样本检测估计数据序列，其中序列检测器根据包括多个目标值的目标响应进行操作。控制电路通过响应于预期样本和均衡样本之间的差计算误差值来适应目标值，响应于训练数据序列与误差值的相关性来计算梯度，以及调整至少一个目标值响应梯度。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式