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公开(公告)号：US07167330B2
公开(公告)日：2007-01-23
申请号：US11100162
申请日：2005-04-06
申请人： Carl F. Elliott , Hao Fang , Ross S. Wilson
发明人： Carl F. Elliott , Hao Fang , Ross S. Wilson
IPC分类号： G11B5/03
CPC分类号： G11B20/1403 , G11B5/012 , G11B20/00086 , G11B20/0021 , G11B20/00579 , G11B20/10009 , G11B20/10425 , G11B2020/10898 , G11B2220/2516
摘要： A recording system stores recording cycle information identifying the parameters for recording user data on a particular data sector. During a subsequent operation, the recording system employs the recording cycle information to select a different set of parameters for recording new user data at the particular data sector. One of the parameters might identify a recorded pattern in a balance pad at the data sector, and another one of the parameters might identify a scrambler seed value. By employing a different set of recording parameters for each occurrence of recording user data at the particular sector, sample timing of, for example, a read channel might be based on an average of easy and hard transitions.
摘要翻译： 记录系统存储识别用于在特定数据扇区上记录用户数据的参数的记录周期信息。 在随后的操作期间，记录系统采用记录周期信息来选择用于在特定数据扇区记录新用户数据的不同参数集合。 参数中的一个可以识别数据扇区中的平衡衬垫中的记录模式，另一个参数可以识别加扰器种子值。 通过对特定扇区的记录用户数据的每次出现采用不同的记录参数集合，例如读通道的采样定时可以基于简单和硬转换的平均值。
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公开(公告)号：US07345839B2
公开(公告)日：2008-03-18
申请号：US10867239
申请日：2004-06-14
CPC分类号： G11B20/10027 , G11B5/09 , G11B20/10009 , G11B20/10046 , G11B20/10425
摘要： A disc drive system, such as a magnetic or optical recording and/or playback system, for low-data rate applications implements one or more circuit operations, such as read signal detection and related servo functions, as software-based digital signal processing steps in a dedicated software-based processor. The drive system incorporates increased buffering, modified input sample processing techniques, multiplexing of processing functions, and modified automatic gain control techniques to allow circuit operations to be performed with software-based digital signal processing techniques.
摘要翻译： 用于低数据速率应用的诸如磁或光记录和/或播放系统的盘驱动系统实现一个或多个电路操作，例如读信号检测和相关的伺服功能，作为基于软件的数字信号处理步骤 专用的基于软件的处理器。 驱动系统包括增加的缓冲，修改的输入采样处理技术，处理功能的多路复用和修改的自动增益控制技术，以允许使用基于软件的数字信号处理技术执行电路操作。
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公开(公告)号：US07692887B2
公开(公告)日：2010-04-06
申请号：US11520493
申请日：2006-09-13
IPC分类号： G11B27/36
CPC分类号： G11B5/455 , G11B2005/0016
摘要： An apparatus and method for determining a head parameter value (e.g., head resistance) of a resistive head. A test head current is supplied to the head during a head parameter measurement interval using the same current sources that supply a bias current to the head during an operating (read operation) interval. The determined head parameter value is latched for use in setting the control loop gain for a control loop that controls the current sources during the operating interval.
摘要翻译： 一种用于确定电阻头的头部参数值（例如，头部电阻）的装置和方法。 在头部参数测量间隔期间，使用在操作（读取操作）间隔期间向头部提供偏置电流的相同电流源向头部提供测试头电流。 确定的头参数值被锁存用于设置在操作间隔期间控制电流源的控制回路的控制回路增益。
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公开(公告)号：US20080062551A1
公开(公告)日：2008-03-13
申请号：US11520493
申请日：2006-09-13
申请人： Daniel J. Dolan , Hao Fang , Jeffrey A. Gleason , Ross S. Wilson
发明人： Daniel J. Dolan , Hao Fang , Jeffrey A. Gleason , Ross S. Wilson
CPC分类号： G11B5/455 , G11B2005/0016
摘要： An apparatus and method for determining a head parameter value (e.g., head resistance) of a resistive head. A test head current is supplied to the head during a head parameter measurement interval using the same current sources that supply a bias current to the head during an operating (read operation) interval. The determined head parameter value is latched for use in setting the control loop gain for a control loop that controls the current sources during the operating interval.
摘要翻译： 一种用于确定电阻头的头部参数值（例如，头部电阻）的装置和方法。 在头部参数测量间隔期间，使用在操作（读取操作）间隔期间向头部提供偏置电流的相同电流源向头部提供测试头电流。 确定的头参数值被锁存用于设置在操作间隔期间控制电流源的控制回路的控制回路增益。
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公开(公告)号：US08565048B1
公开(公告)日：2013-10-22
申请号：US13472448
申请日：2012-05-15
申请人： Ross S. Wilson , Jason P. Brenden , Xuemin Yang
发明人： Ross S. Wilson , Jason P. Brenden , Xuemin Yang
CPC分类号： G11B5/02 , G11B2005/0021 , H01S5/0427
摘要： Various embodiments of the present invention provide single-ended and differential current drivers for heat assisted magnetic recording and other applications. For example, a current driver is disclosed that includes an upper output terminal and lower output terminal, a number of current switches operable to selectively contribute electrical currents through the upper and lower output terminals, a control input for each of the current switches operable to control the electrical currents, and a voltage supply operable to establish a voltage across the upper and output terminals.
摘要翻译： 本发明的各种实施例提供用于热辅助磁记录和其它应用的单端和差动电流驱动器。 例如，公开了一种电流驱动器，其包括上部输出端子和下部输出端子，多个电流开关，其可操作以选择性地提供通过上部和下部输出端子的电流;每个电流开关的控制输入可操作以控制 电流和可用于在上部和输出端子上建立电压的电压源。
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公开(公告)号：US20090322266A1
公开(公告)日：2009-12-31
申请号：US12374304
申请日：2006-09-26
IPC分类号： H02P6/20
摘要： Various systems and methods for controlling DC motors are disclosed herein. For example, one method provides for controlling a polyphase, brushless DC motor. The method includes providing a DC motor that has a plurality of phases. Such a DC motor operates by inducing a current in the plurality of phases in accordance with a plurality of commutation states. In the example, six commutation states are discussed, but fewer than or more than six commutation states may exist. The method further includes initializing a count, inducing a current in the plurality of phases in accordance with a first commutation state, and incrementing the count until the current achieves a threshold in the first commutation state. Then, a current is induced in the plurality of phases in accordance with a second commutation state, and the count is decremented until the current achieves the threshold in the second commutation state. The sign bit of the count is stored, and a desired initial commutation state is determined based at least in part on the sign bit of the count.
摘要翻译： 本文公开了用于控制DC电动机的各种系统和方法。 例如，一种方法用于控制多相无刷直流电动机。 该方法包括提供具有多个相位的DC电动机。 这样的直流电动机通过根据多个换向状态感应多相中的电流来进行工作。 在该示例中，讨论了六个换向状态，但是可能存在少于或多于六个换向状态。 该方法还包括初始化计数，根据第一换向状态诱发多个相位中的电流，并且增加计数直到电流达到第一换向状态的阈值。 然后，根据第二换向状态在多相中感应出电流，并且减少计数直到电流在第二换向状态下达到阈值。 存储计数的符号位，并且至少部分地基于计数的符号位来确定期望的初始换向状态。
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公开(公告)号：US20120275279A1
公开(公告)日：2012-11-01
申请号：US13096900
申请日：2011-04-28
申请人： Ross S. Wilson , Donald C. Grillo
发明人： Ross S. Wilson , Donald C. Grillo
CPC分类号： G11B5/02 , G11B20/10009 , G11B2005/0021
摘要： Various embodiments of the present invention provide systems and methods for data writing. As an example, a heat assisted data write circuit is discussed that includes a heat write output, a magnetic write output, and a variable phase shift circuit operable to modify a relative phase of the heat write output to the magnetic write output.
摘要翻译： 本发明的各种实施例提供了用于数据写入的系统和方法。 例如，讨论了一种热辅助数据写入电路，其包括热写入输出，磁性写入输出和可变相移电路，其可操作以将加热写入输出的相对相位修改为磁性写入输出。
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公开(公告)号：US08013552B2
公开(公告)日：2011-09-06
申请号：US12374304
申请日：2006-09-26
IPC分类号： H02P6/04
摘要： Various systems and methods for controlling DC motors are disclosed herein. For example, one method provides for controlling a polyphase, brushless DC motor. The method includes providing a DC motor that has a plurality of phases. Such a DC motor operates by inducing a current in the plurality of phases in accordance with a plurality of commutation states. In the example, six commutation states are discussed, but fewer than or more than six commutation states may exist. The method further includes initializing a count, inducing a current in the plurality of phases in accordance with a first commutation state, and incrementing the count until the current achieves a threshold in the first commutation state. Then, a current is induced in the plurality of phases in accordance with a second commutation state, and the count is decremented until the current achieves the threshold in the second commutation state. The sign bit of the count is stored, and a desired initial commutation state is determined based at least in part on the sign bit of the count.
摘要翻译： 本文公开了用于控制DC电动机的各种系统和方法。 例如，一种方法用于控制多相无刷直流电动机。 该方法包括提供具有多个相位的DC电动机。 这样的直流电动机通过根据多个换向状态感应多相中的电流来进行工作。 在该示例中，讨论了六个换向状态，但是可能存在少于或多于六个换向状态。 该方法还包括初始化计数，根据第一换向状态诱发多个相位中的电流，并且增加计数直到电流达到第一换向状态的阈值。 然后，根据第二换向状态在多相中感应出电流，并且减少计数直到电流在第二换向状态下达到阈值。 存储计数的符号位，并且至少部分地基于计数的符号位来确定期望的初始换向状态。
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公开(公告)号：US08565047B2
公开(公告)日：2013-10-22
申请号：US13096873
申请日：2011-04-28
申请人： Ross S. Wilson
发明人： Ross S. Wilson
CPC分类号： G11B13/04 , G11B5/02 , G11B20/10009 , G11B2005/0021
摘要： Various embodiments of the present invention provide systems and methods for data writing. As an example, a heat assisted loopback circuit is discussed that includes: a read circuit, a magnetic write circuit, a heat write circuit, and a loopback circuit. The read circuit is operable to sense data from a storage medium, and to provide the sensed data as a read output. The magnetic write circuit is operable to provide a write output corresponding to an excitation signal of a write head. The heat write circuit is operable to provide a heat output corresponding to an excitation signal of a heat source. The loopback circuit is operable to selectively couple a derivative of the heat output to the read output and to selectively couple a derivative of the write output to the read output.
摘要翻译： 本发明的各种实施例提供了用于数据写入的系统和方法。 作为示例，讨论了包括读取电路，磁性写入电路，加热写入电路和环回电路的热辅助回路电路。 读取电路可操作以感测来自存储介质的数据，并将所感测的数据提供为读取输出。 磁写入电路可操作以提供与写入头的激励信号相对应的写入输出。 热写电路可操作以提供对应于热源的激励信号的热输出。 环回电路可操作以选择性地将热输出的导数耦合到读输出并选择性地将写输出的导数耦合到读输出。
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公开(公告)号：US20120275278A1
公开(公告)日：2012-11-01
申请号：US13096873
申请日：2011-04-28
申请人： Ross S. Wilson
发明人： Ross S. Wilson
CPC分类号： G11B13/04 , G11B5/02 , G11B20/10009 , G11B2005/0021
摘要： Various embodiments of the present invention provide systems and methods for data writing. As an example, a heat assisted loopback circuit is discussed that includes: a read circuit, a magnetic write circuit, a heat write circuit, and a loopback circuit. The read circuit is operable to sense data from a storage medium, and to provide the sensed data as a read output. The magnetic write circuit is operable to provide a write output corresponding to an excitation signal of a write head. The heat write circuit is operable to provide a heat output corresponding to an excitation signal of a heat source. The loopback circuit is operable to selectively couple a derivative of the heat output to the read output and to selectively couple a derivative of the write output to the read output.
摘要翻译： 本发明的各种实施例提供了用于数据写入的系统和方法。 作为示例，讨论了包括读取电路，磁性写入电路，加热写入电路和环回电路的热辅助回路电路。 读取电路可操作以感测来自存储介质的数据，并将所感测的数据提供为读取输出。 磁写入电路可操作以提供与写入头的激励信号相对应的写入输出。 热写电路可操作以提供对应于热源的激励信号的热输出。 环回电路可操作以选择性地将热输出的导数耦合到读输出并选择性地将写输出的导数耦合到读输出。
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