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1.发明申请Apparatus, signal-processing circuit and device for magnetic recording system 失效用于磁记录系统的装置，信号处理电路和装置公开(公告)号：US20110013306A1
公开(公告)日：2011-01-20
申请号：US12923307
申请日：2010-09-14
IPC分类号： G11B5/09
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/10203 , G11B2005/0016 , G11B2005/0029
摘要： To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus.
摘要翻译： 为了有效地抑制中等噪声和信号失真集中的低频区域中的信号，为了有效地利用低频区域中的再现信号的检测分量，将垂直方向的部分响应均衡的目标 记录再现信号被设定为使得直流电流周围的低频分量被抑制到有效抑制和有效利用两者的规定量。 因此，通过部分响应均衡的目标来执行最大似然解码处理。 数据检测的可靠性进一步提高，信噪比得到改善，从而可以进一步降低来自记录介质的噪声，并且可以提供高密度的磁记录/重放装置。
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公开(公告)号：US07502189B2
公开(公告)日：2009-03-10
申请号：US09940475
申请日：2001-08-29
IPC分类号： G11B5/35
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/10203 , G11B2005/0016 , G11B2005/0029
摘要： To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus.
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公开(公告)号：US20090021852A1
公开(公告)日：2009-01-22
申请号：US12232435
申请日：2008-09-17
IPC分类号： G11B5/09
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/10203 , G11B2005/0016 , G11B2005/0029
摘要： To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus.
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4.发明授权Apparatus, signal-processing circuit and device for magnetic recording system 失效用于磁记录系统的装置，信号处理电路和装置公开(公告)号：US08144415B2
公开(公告)日：2012-03-27
申请号：US12923307
申请日：2010-09-14
IPC分类号： G11B5/35
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/10203 , G11B2005/0016 , G11B2005/0029
摘要： To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus.
摘要翻译： 为了有效地抑制中等噪声和信号失真集中的低频区域中的信号，为了有效地利用低频区域中的再现信号的检测分量，将垂直方向的部分响应均衡的目标 记录再现信号被设定为使得直流电流周围的低频分量被抑制到有效抑制和有效利用两者的规定量。 因此，通过部分响应均衡的目标来执行最大似然解码处理。 数据检测的可靠性进一步提高，信噪比得到改善，从而可以进一步降低来自记录介质的噪声，并且可以提供高密度的磁记录/重放装置。
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5.发明授权Apparatus, signal-processing circuit and device for magnetic recording system 有权用于磁记录系统的装置，信号处理电路和装置公开(公告)号：US07817367B2
公开(公告)日：2010-10-19
申请号：US12232435
申请日：2008-09-17
IPC分类号： G11B5/35
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/10203 , G11B2005/0016 , G11B2005/0029
摘要： To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus.
摘要翻译： 为了有效地抑制中等噪声和信号失真集中的低频区域中的信号，为了有效地利用低频区域中的再现信号的检测分量，将垂直方向的部分响应均衡的目标 记录再现信号被设定为使得直流电流周围的低频分量被抑制到有效抑制和有效利用两者的规定量。 因此，通过部分响应均衡的目标来执行最大似然解码处理。 数据检测的可靠性进一步提高，信噪比得到改善，从而可以进一步降低来自记录介质的噪声，并且可以提供高密度的磁记录/重放装置。
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公开(公告)号：US07443625B2
公开(公告)日：2008-10-28
申请号：US11404780
申请日：2006-04-17
申请人： Takehiko Hamaguchi , Atsushi Nakamura , Yasutaka Nishida , Hisashi Takano , Yohji Maruyama , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
发明人： Takehiko Hamaguchi , Atsushi Nakamura , Yasutaka Nishida , Hisashi Takano , Yohji Maruyama , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
IPC分类号： G11B5/02
CPC分类号： G11B5/012 , G11B5/4886 , G11B27/02
摘要： In the present invention, by making the width of the write element larger than the track pitch and securing a write magnetic field strong enough to reverse the magnetization of the magnetic layer, and further by writing while shifting a write head comprising the write element, a magnetic disk drive, of which the track width is narrower than the write element width, and the storage capacity is large, is realized.
摘要翻译： 在本发明中，通过使写入元件的宽度大于轨道间距，并且确保写入磁场足够强以反转磁性层的磁化，并且进一步通过在包括写入元件的写入头的移位的同时进行写入， 磁盘驱动器，其轨道宽度比写入元件宽度窄，并且存储容量大。
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公开(公告)号：US06657805B2
公开(公告)日：2003-12-02
申请号：US09944205
申请日：2001-09-04
申请人： Yasutaka Nishida , Takehiko Hamaguchi , Hisashi Takano , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
发明人： Yasutaka Nishida , Takehiko Hamaguchi , Hisashi Takano , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
IPC分类号： G11B1504
摘要： When the amount of position error PE of a magnetic head meets the condition of Ewf>PE>=Eww for two threshold values Ewf and Eww meeting Ewf>Eww, the track is registered in the track information table as a track requiring rewrite and the tracks on both sides neighboring to the track are temporarily write-inhibited. The data of the track is rewritten on another track later so as to maintain the data. By doing this, the offtrack of the recording track can be made smaller without sacrifice of the access speed and the occurrence probability of write fault can be reduced. Furthermore, the reliability of a magnetic disk apparatus can be improved.
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公开(公告)号：US20060187578A1
公开(公告)日：2006-08-24
申请号：US11404780
申请日：2006-04-17
申请人： Takehiko Hamaguchi , Atsushi Nakamura , Yasutaka Nishida , Hisashi Takano , Yohji Maruyama , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
发明人： Takehiko Hamaguchi , Atsushi Nakamura , Yasutaka Nishida , Hisashi Takano , Yohji Maruyama , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
IPC分类号： G11B17/00
CPC分类号： G11B5/012 , G11B5/4886 , G11B27/02
摘要： For the purpose of letting through a magnetic flux which reverses the magnetization of the magnetic layer of the magnetic disk, a write element requires a predetermined sectional area. However, if a cross section of a magnetic pole is structured as the one having a large aspect ratio, the pole becomes less capable of letting the magnetic flux through effectively. This phenomenon brings about a lower limit on the track width of the magnetic poles and the track density cannot be raised. In the present invention, by making the width of the write element larger than the track pitch and securing a write magnetic field strong enough to reverse the magnetization of the magnetic layer, and further by writing while shifting a write head comprising the write element, a magnetic disk drive, of which the track width is narrower than the write element width, and the storage capacity is large, is realized.
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9.发明授权Data recording/reproducing signal processing circuit for magnetic recording, and perpendicular magnetic recording/reproducing apparatus using it 有权用于磁记录的数据记录/再现信号处理电路和使用它的垂直磁记录/再现装置公开(公告)号：US06741412B2
公开(公告)日：2004-05-25
申请号：US09875875
申请日：2001-06-08
IPC分类号： G11B509
CPC分类号： G11B5/1278 , G11B5/00 , G11B5/035 , G11B5/09 , G11B5/3912 , G11B5/3967 , G11B20/10 , G11B20/10009 , G11B20/18 , G11B20/24 , G11B2005/0016 , G11B2005/0029
摘要： A magnetic recording/reproducing apparatus includes a partial-response equalization circuit having frequency characteristic of cutting off low-frequency signal components inclusive of DC components; and a maximum-likelihood decoder, in which a reproduced signal outputted from the reproducing head is processed by the partial-response equalization circuit and then inputted into the maximum-likelihood decoder to be data-reproduced, thereby reducing a noise and distortion on the reproduced signal and reducing a data detection error rate.
摘要翻译： 磁记录/再现装置包括具有截止包括DC分量的低频信号分量的频率特性的部分响应均衡电路; 以及最大似然解码器，其中从再现头输出的再现信号由部分响应均衡电路处理，然后输入到最大似然解码器中进行数据再现，从而减少再现的噪声和失真 信号并降低数据检测错误率。
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公开(公告)号：US06310741B1
公开(公告)日：2001-10-30
申请号：US09225972
申请日：1999-01-05
申请人： Yasutaka Nishida , Takehiko Hamaguchi , Hisashi Takano , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
发明人： Yasutaka Nishida , Takehiko Hamaguchi , Hisashi Takano , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
IPC分类号： G11B509
摘要： When the amount of position error PE of a magnetic head meets the condition of Ewf>PE>=Eww for two threshold values Ewf and Eww meeting Ewf>Eww, the track is registered in the track information table as a track requiring rewrite and the tracks on both sides neighboring to the track are temporarily write-inhibited. The data of the track is rewritten on another track later so as to maintain the data. By doing this, the offtrack of the recording track can be made smaller without sacrifice of the access speed and the occurrence probability of write fault can be reduced. Furthermore, the reliability of a magnetic disk apparatus can be improved.
摘要翻译： 当磁头的位置误差PE的数量满足Ewf> PE> = Eww的两个阈值Ewf和Eww满足Ewf> Eww的条件时，轨道被记录在轨道信息表中作为需要重写的轨道，并且轨道 在与轨道相邻的两侧临时禁止写入。 轨道的数据稍后被重写在另一个轨道上，以便保持数据。这样做，可以使得记录轨道的远距离更小，而不牺牲访问速度，并且可以减少写入故障的发生概率。 此外，可以提高磁盘装置的可靠性。
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