公开(公告)号：US06798832B1

公开(公告)日：2004-09-28

申请号：US09536184

申请日：2000-03-27

申请人： Yoshitaka Nakata ,  Masaru Sawada ,  Tsunehiko Moriuchi

发明人： Yoshitaka Nakata ,  Masaru Sawada ,  Tsunehiko Moriuchi

IPC分类号： H04H740

CPC分类号： G11B20/10046 ,  G11B20/10009 ,  G11B20/10055

摘要： A semiconductor circuit includes a decision feedback equalizer (DFE) for waveform-equalizing an input signal and generating a waveform-equalized input signal. The DFE compares the waveform-equalized signal with a predetermined reference voltage to generate a decision signal having first and second decision values and an error signal which lies between the waveform-equalized signal and the decision signal. A dispersion value calculator is connected to the DFE, calculates first and second dispersion values of the first and second decision values of the decision signal using the error signal, and produces a compensation signal using the first and second dispersion values. An asymmetry compensator is connected to the DFE and the dispersion value calculator. The asymmetry compensator receives the input signal and corrects an asymmetry in the input signal in accordance with the compensation signal and supplies the corrected input signal to the DFE. The semiconductor device may be used in a hard disk control circuit.

摘要翻译： 半导体电路包括用于对输入信号进行波形均衡并产生波形均衡的输入信号的判决反馈均衡器（DFE）。 DFE将波形均衡信号与预定参考电压进行比较，以产生具有第一和第二判定值的判定信号和位于波形均衡信号和判决信号之间的误差信号。 色散值计算器连接到DFE，使用误差信号计算判定信号的第一和第二判定值的第一和第二色散值，并使用第一和第二色散值产生补偿信号。 不对称补偿器连接到DFE和色散值计算器。 不对称补偿器根据补偿信号接收输入信号并校正输入信号的不对称性，并将校正的输入信号提供给DFE。 半导体器件可以用在硬盘控制电路中。

公开(公告)号：US06600779B1

公开(公告)日：2003-07-29

申请号：US09274350

申请日：1999-03-23

申请人： Masaru Sawada ,  Tsuyoshi Tomita ,  Yoshitaka Nakata ,  Tsunehiko Moriuchi ,  Kenichi Yamakura ,  Hideaki Tanishima ,  Fumiaki Uematsu ,  Koji Horibe ,  Manabu Nakano

发明人： Masaru Sawada ,  Tsuyoshi Tomita ,  Yoshitaka Nakata ,  Tsunehiko Moriuchi ,  Kenichi Yamakura ,  Hideaki Tanishima ,  Fumiaki Uematsu ,  Koji Horibe ,  Manabu Nakano

IPC分类号： H03H730

CPC分类号： G11B20/10009 ,  G11B20/10046 ,  G11B20/18

摘要： A signal processor used to process an analog read signal representing data stored on a magnetic disk allows for a faster read operation without requiring an increase in its circuit area or buffer memory space. The signal processor includes a decision feedback equalizer which selectively provides a feedback signal added to a read signal in reproducing data read from a storage medium. The signal processor also performs error correction. In performing error correction, the load of the error correcting process is detected and the processing speed is altered depending upon the detected load.

摘要翻译： 用于处理表示存储在磁盘上的数据的模拟读取信号的信号处理器允许更快的读取操作，而不需要增加其电路面积或缓冲存储器空间。 信号处理器包括判决反馈均衡器，其在再现从存储介质读取的数据时选择性地提供添加到读取信号的反馈信号。 信号处理器还执行纠错。 在执行纠错时，检测出纠错处理的负载，并且根据检测到的负载改变处理速度。

公开(公告)号：US06462686B2

公开(公告)日：2002-10-08

申请号：US09782297

申请日：2001-02-14

申请人： Shigetaka Asano ,  Yoshitaka Nakata

发明人： Shigetaka Asano ,  Yoshitaka Nakata

IPC分类号： H03M300

CPC分类号： G11B20/10009 ,  H03M1/185

摘要： A servo controller for correcting a read position of a head when reading data recorded on a recording medium. In accordance with the amplitude ratio of data signals read from each segment of a servo section defined on a recording medium, the servo controller generates an AGC signal corresponding to the next segment before reading the next segment. The data signal read from a phase detection segment of the servo section is amplified to an amplitude greater than the predetermined determination range. The amplified data signal is converted to a two-value digital signal in accordance with the determination range. The phase used during servo control is calculated in accordance with the digital signal.

摘要翻译： 一种伺服控制器，用于当读取记录在记录介质上的数据时校正磁头的读取位置。 根据从在记录介质上限定的伺服部分的每个段读取的数据信号的幅度比，伺服控制器在读取下一个段之前产生对应于下一段的AGC信号。 从伺服部分的相位检测段读取的数据信号被放大到大于预定确定范围的幅度。 放大的数据信号根据确定范围被转换为二值数字信号。 根据数字信号计算伺服控制期间使用的相位。

公开(公告)号：US07023946B2

公开(公告)日：2006-04-04

申请号：US10288286

申请日：2002-11-06

申请人： Masaru Sawada ,  Tsuyoshi Tomita ,  Yoshitaka Nakata ,  Tsunehiko Moriuchi ,  Kenichi Yamakura ,  Hideaki Tanishima ,  Fumiaki Uematsu ,  Koji Horibe ,  Manabu Nakano

发明人： Masaru Sawada ,  Tsuyoshi Tomita ,  Yoshitaka Nakata ,  Tsunehiko Moriuchi ,  Kenichi Yamakura ,  Hideaki Tanishima ,  Fumiaki Uematsu ,  Koji Horibe ,  Manabu Nakano

IPC分类号： H03D3/24

CPC分类号： G11B20/10009 ,  G11B20/10046 ,  G11B20/18

摘要： A signal processor used to process an analog read signal representing data stored on a magnetic disk allows for a faster read operation without requiring an increase in its circuit area or buffer memory space. The signal processor includes a decision feedback equalizer which selectively provides a feedback signal added to a read signal in reproducing data read from a storage medium. The signal processor also performs error correction. In performing error correction, the load of the error correcting process is detected and the processing speed is altered depending upon the detected load.