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1. 发明授权

US06873488B2 Enhanced MR offset with dynamic tuning range 失效
标题翻译：具有动态调谐范围的增强MR偏移
公开(公告)号：US06873488B2
公开(公告)日：2005-03-29
申请号：US10459996
申请日：2003-06-12
申请人： SongWee Teo , WeiMing Yeow , QuckLeong Choo
发明人： SongWee Teo , WeiMing Yeow , QuckLeong Choo
IPC分类号： G11B5/596 , G11B27/36
CPC分类号： G11B5/59683 , G11B5/59627
摘要： A reader-to-writer offset for a head positioned over a track on a disc in a disc drive having a plurality of tracks is generated by using two iterations. A first iteration is used to determine a fine-tuning range that is used for a second iteration. The first iteration uses coarse steps of the reader across the track pitch to roughly determine OTC boundaries (which are used as the fine-tuning range). The fine-tuning range is determined by locating the point before the first valid reading (e.g., a VGA reading or BER reading with a rate that is less than the BER threshold) and by locating the point after the last valid reading. The second iteration uses fine steps of the reader across the track pitch to determine the actual OTC boundaries. The OTC boundaries are the first valid reading and the last valid reading that are made using the fine steps.
摘要翻译：通过使用两次迭代来生成具有位于具有多个轨道的盘驱动器中的盘上的轨道上的头的读写器偏移量。第一次迭代用于确定用于第二次迭代的微调范围。第一次迭代使用阅读器在轨道间距的粗略步骤粗略地确定OTC边界（用作微调范围）。通过在第一次有效读取之前定位点（例如，具有小于BER阈值的速率的VGA读数或BER读数）以及通过在最后一次有效读数之后定位点来确定微调范围。第二次迭代使用读者跨越轨道间距的精细步骤来确定实际的OTC边界。 OTC边界是使用精细步骤进行的第一个有效读数和最后一个有效读数。

2. 发明申请

US20050244167A1 Signal-to-noise ratio (SNR) value characterization in a data recovery channel 审中-公开
标题翻译：数据恢复通道中的信噪比（SNR）值表征
公开(公告)号：US20050244167A1
公开(公告)日：2005-11-03
申请号：US10834480
申请日：2004-04-29
申请人： Sanyuan Liew , TeckKhoon Lim , CheeFong Oh , WengKhin Chew , KokHoe Chia , SongWee Teo
发明人： Sanyuan Liew , TeckKhoon Lim , CheeFong Oh , WengKhin Chew , KokHoe Chia , SongWee Teo
IPC分类号： G11B5/596 , H04B10/06
CPC分类号： G11B5/59605
摘要： Method and apparatus for determining a signal-to-noise ratio (SNR) value from a readback signal, such as in a data storage device. A readback signal is obtained by a receiver (such as a data transducing head) coupled to a data recovery channel having a variable gain amplifier (VGA) and a threshold detector (TD). The data channel applies a selectable VGA gain value to the readback signal while errors are accumulated using a selectable error detection threshold from the TD. The SNR value is determined at least from a magnitude of the error detection threshold, and preferably from first and second VGA gain values using a linear regression model. The determined SNR value is highly correlated to classical SNR values obtained using external equipment such as an analyzer or oscilloscope, and is advantageously used in automated fashion during high volume manufacturing certification testing.
摘要翻译：用于从诸如数据存储设备中的回读信号确定信噪比（SNR）值的方法和装置。通过耦合到具有可变增益放大器（VGA）和阈值检测器（TD）的数据恢复通道的接收器（例如数据传输头）获得回读信号。数据通道将可选择的VGA增益值应用于回读信号，同时使用TD的可选误差检测阈值积累错误。 SNR值至少从误差检测阈值的大小确定，优选地使用线性回归模型从第一和第二VGA增益值确定。确定的SNR值与使用诸如分析仪或示波器之类的外部设备获得的经典SNR值高度相关，并且在大批量制造认证测试期间有利地以自动化方式使用。

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