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    Apparatus, signal-processing circuit and device for magnetic recording system
    22.
    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

    申请人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Hisashi Takano ,  Hiroyuki Tsuchinaga

    发明人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Hisashi Takano ,  Hiroyuki Tsuchinaga

    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。

    Apparatus, signal-processing circuit and device for magnetic recording system
    23.
    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

    申请人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Hisashi Takano ,  Hiroyuki Tsuchinaga

    发明人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Hisashi Takano ,  Hiroyuki Tsuchinaga

    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。

    Data decoding method and circuit and information recording and reproducing apparatus using the same
    27.
    发明授权
    Data decoding method and circuit and information recording and reproducing apparatus using the same 失效
    数据解码方法及使用其的电路和信息记录和再现装置

    公开(公告)号：US07024617B2

    公开(公告)日：2006-04-04

    申请号：US10206211

    申请日：2002-07-29

    申请人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hiroyuki Tsuchinaga

    发明人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hiroyuki Tsuchinaga

    IPC分类号： H03M13/03

    CPC分类号： G11B20/10055 ,  G11B5/012 ,  G11B5/09 ,  G11B20/1403 ,  G11B20/18

    摘要： In a partial-response maximum-likelihood (PRML) signal detection and processing technique, reduction of data detection error events caused due to medium noise is achieved. For a PRML detection data result obtained after PRML data demodulation, a code error event that depends on a signal distance, and which has a high frequency of occurrences, is noticed and its occurrence probability is estimated. A locally-existing medium noise quantity is estimated from preceding and subsequent code patterns of the PRML detection data result. Based on this, the occurrence probability of the error event is compensated to improve the detection precision. As a result, data modulation with reliability higher than conventional maximum likelihood detection can be realized with a simple circuit structure.

    摘要翻译： 在部分响应最大似然（PRML）信号检测和处理技术中，实现了由于中等噪声引起的数据检测误差事件的减少。 对于在PRML数据解调之后获得的PRML检测数据结果，注意到取决于信号距离并且具有高频率出现的代码错误事件，并且估计其发生概率。 根据PRML检测数据结果的前后代码模式估计本地存在的中等噪声量。 基于此，对误差事件的发生概率进行补偿，提高检测精度。 结果，可以通过简单的电路结构实现具有高于常规最大似然检测的可靠性的数据调制。

    Data decoding method and circuit and information recording and reproducing apparatus using the same
    28.
    发明授权
    Data decoding method and circuit and information recording and reproducing apparatus using the same 有权
    数据解码方法及使用其的电路和信息记录和再现装置

    公开(公告)号：US07213195B2

    公开(公告)日：2007-05-01

    申请号：US11339574

    申请日：2006-01-26

    申请人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hiroyuki Tsuchinaga

    发明人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hiroyuki Tsuchinaga

    IPC分类号： H03M13/03

    CPC分类号： G11B20/10055 ,  G11B5/012 ,  G11B5/09 ,  G11B20/1403 ,  G11B20/18

    摘要： In a partial-response maximum-likelihood (PRML) signal detection and processing technique, reduction of data detection error events caused due to medium noise is achieved. For a PRML detection data result obtained after PRML data demodulation, a code error event that depends on a signal distance, and which has a high frequency of occurrence, is noticed and its occurrence probability is estimated. A locally-existing medium noise quantity is estimated from preceding and subsequent code patterns of the PRML detection data result. Based on this, the occurrence probability of the error event is compensated to improve the detection precision. As a result, data modulation with reliability higher than conventional maximum likelihood detection can be realized with a simple circuit structure.

    摘要翻译： 在部分响应最大似然（PRML）信号检测和处理技术中，实现了由于中等噪声引起的数据检测误差事件的减少。 对于在PRML数据解调之后获得的PRML检测数据结果，注意到取决于信号距离并且具有高频率出现的代码错误事件，并且估计其发生概率。 根据PRML检测数据结果的前后代码模式估计本地存在的中等噪声量。 基于此，对误差事件的发生概率进行补偿，提高检测精度。 结果，可以通过简单的电路结构实现具有高于常规最大似然检测的可靠性的数据调制。

    Data decoding method and circuit and information recording and reproducing apparatus using the same
    29.
    发明申请
    Data decoding method and circuit and information recording and reproducing apparatus using the same 有权
    数据解码方法及使用其的电路和信息记录和再现装置

    公开(公告)号：US20060156208A1

    公开(公告)日：2006-07-13

    申请号：US11339574

    申请日：2006-01-26

    申请人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hiroyuki Tsuchinaga

    发明人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hiroyuki Tsuchinaga

    IPC分类号： H03M13/03

    CPC分类号： G11B20/10055 ,  G11B5/012 ,  G11B5/09 ,  G11B20/1403 ,  G11B20/18

    摘要： In a partial-response maximum-likelihood (PRML) signal detection and processing technique, reduction of data detection error events caused due to medium noise is achieved. For a PRML detection data result obtained after PRML data demodulation, a code error event that depends on a signal distance, and which has a high frequency of occurrence, is noticed and its occurrence probability is estimated. A locally-existing medium noise quantity is estimated from preceding and subsequent code patterns of the PRML detection data result. Based on this, the occurrence probability of the error event is compensated to improve the detection precision. As a result, data modulation with reliability higher than conventional maximum likelihood detection can be realized with a simple circuit structure.

    摘要翻译： 在部分响应最大似然（PRML）信号检测和处理技术中，实现了由于中等噪声引起的数据检测误差事件的减少。 对于在PRML数据解调之后获得的PRML检测数据结果，注意到取决于信号距离并且具有高频率出现的代码错误事件，并且估计其发生概率。 根据PRML检测数据结果的前后代码模式估计本地存在的中等噪声量。 基于此，对误差事件的发生概率进行补偿，提高检测精度。 结果，可以通过简单的电路结构实现具有高于常规最大似然检测的可靠性的数据调制。