公开(公告)号：US20100014405A1

公开(公告)日：2010-01-21

申请号：US12510419

申请日：2009-07-28

Applicant: Takeshi NAKAJIMA ,  Harumitsu MIYASHITA ,  Hiromichi ISHIBASHI ,  Shigeru FURUMIYA

Inventor： Takeshi NAKAJIMA ,  Harumitsu MIYASHITA ,  Hiromichi ISHIBASHI ,  Shigeru FURUMIYA

IPC: G11B7/00

CPC classification number: G11B20/1816

Abstract: A most probable path is selected from a number n (where n≧2) of paths of state transitions occurring from a first state Sk−j (where k≧3 and j≧2) at a time k−j into a second state Sk at a time k. The method includes the steps of detecting predetermined combinations of the first and second states Sk−j and Sk defining the n probable paths in a predetermined period j between the times k−j and k, and evaluating the reliability of a read signal, decoded in the period j, by |Pa−Pb|. Pa and Pb indicate the probabilities of state transition of first and second state transition paths in the period j. The first and second state transition paths are estimated to be the most probable and the second most probable, respectively, among the n probable paths defined by the combinations detected.

Abstract translation: 从时刻kj的第一状态Sk-j（其中k> = 3和j> = 2）发生的状态转换路径的数n（其中n> = 2）中选择最可能的路径为第二状态 Sk一次k。 该方法包括以下步骤：检测在时间kj和k之间的预定周期j中定义n个可能路径的第一和第二状态Sk-j和Sk的预定组合，并且评估在该周期中解码的读取信号的可靠性 j，by | Pa-Pb |​​。 Pa和Pb表示周期j中第一和第二状态转换路径的状态转移的概率。 估计第一和第二状态转换路径是由检测到的组合定义的n个可能路径中最可能和最可能的最可能的。

公开(公告)号：US20100097908A1

公开(公告)日：2010-04-22

申请号：US12573200

申请日：2009-10-05

Applicant: Kiyotaka ITO ,  Yasumori HINO ,  Harumitsu MIYASHITA ,  Isao KOBAYASHI

Inventor： Kiyotaka ITO ,  Yasumori HINO ,  Harumitsu MIYASHITA ,  Isao KOBAYASHI

IPC: G11B27/36

CPC classification number: G11B7/0037 ,  G11B7/005 ,  G11B7/24038 ,  G11B20/10009 ,  G11B20/10055 ,  G11B20/10296 ,  G11B20/1816 ,  G11B2007/0013

Abstract: A reproduction signal evaluation method according to the present invention includes a step of generating a binary signal from an information recording medium on which a data sequence including marks and spaces in combination is recordable, using a PRML signal processing method from a signal obtained by reproducing the data sequence; and a differential calculation step of calculating a differential metric using a first state transition path having a maximum likelihood and a second state transition path having a second maximum likelihood, and a reproduction signal, the first state transition path and the second state transition path being obtained based on the binary signal. In a pattern including a shortest mark and a shortest space adjacent before or after the shortest mark, a shift amount of an edge of the shortest mark is obtained from a differential metric calculated regarding one of a first pattern in which a space adjacent to the shortest mark and not adjacent to the shortest space is longer than the shortest space; and a second pattern in which a mark adjacent to the shortest space and not adjacent to the shortest mark is longer than the shortest mark.

Abstract translation: 根据本发明的再现信号评估方法包括从信息记录介质生成二进制信号的步骤，在该信息记录介质上，包括组合的记号和空格的数据序列可记录，使用PRML信号处理方法从通过再现 数据序列; 以及差分计算步骤，使用具有最大似然的第一状态转移路径和具有第二最大似然度的第二状态转移路径以及再现信号来计算差分度量，获得第一状态转换路径和第二状态转换路径 基于二进制信号。 在包括最短标记和在最短标记之前或之后相邻的最短空格的图案中，从针对与最短标记相邻的空格的第一图案之一计算的差分度量获得最短标记的边缘的偏移量 标记与不相邻的最短空间长于最短空间; 以及第二图案，其中与最短空间相邻并且不与最短标记相邻的标记比最短标记长。

公开(公告)号：US20100085851A1

公开(公告)日：2010-04-08

申请号：US12244231

申请日：2008-10-02

Applicant: Kiyotaka ITO ,  Yasumori HINO ,  Harumitsu MIYASHITA ,  Isao KOBAYASHI

Inventor： Kiyotaka ITO ,  Yasumori HINO ,  Harumitsu MIYASHITA ,  Isao KOBAYASHI

IPC: G11B27/36

CPC classification number: G11B20/10009 ,  G11B20/10046 ,  G11B20/10055 ,  G11B20/1012 ,  G11B20/10212 ,  G11B20/10296 ,  G11B20/10481 ,  G11B20/1816 ,  G11B20/182 ,  G11B2220/2537 ,  G11B2220/2541

Abstract: The present invention has an object of evaluating a recording and reproduction signal quality of a high density information recording medium by providing an index representing, in a detection signal including a plurality of pieces of edge shift information, how each edge is shifted. A signal evaluation method, usable for an information recording medium having a data sequence including a mark and a space located alternately, for generating a binary signal from a signal obtained by reproducing the data sequence using a PRML signal processing method and evaluating a likelihood of the binary signal, includes a differential metric calculation step of calculating, from the binary signal, a differential metric which is a difference of a reproduction signal from a first state transition matrix having a maximum likelihood and a second state transition matrix having a second maximum likelihood; and a step of classifying the differential metric to any of a plurality of data patterns each including at least one mark and at least one space. The data pattern classification to any of the plurality of data patterns is performed using a combination of a length of a first mark included in the data sequence and a length of a first space adjacently located immediately previous or immediately subsequent to the first mark, and is further performed using a length of a second mark which is not adjacent to the first mark and located adjacent to the first space; and thus a reproduction signal quality of the information recording medium is evaluated.

Abstract translation: 本发明的目的是通过提供一种在包括多个边缘移位信息的检测信号中表示每个边缘如何偏移的指标来评估高密度信息记录介质的记录和再现信号质量。 一种信号评估方法，可用于具有包括标记和交替定位的空间的数据序列的信息记录介质，用于通过使用PRML信号处理方法再现数据序列获得的信号产生二进制信号，并评估 二进制信号包括差分量度计算步骤，从二进制信号计算作为具有最大似然的第一状态转移矩阵的再现信号和具有第二最大似然的第二状态转移矩阵的差的差分度量; 以及将差分度量分类为多个数据模式中的每一个包括至少一个标记和至少一个空间的步骤。 使用数据序列中包括的第一标记的长度与紧邻在第一标记之前或之后紧邻的第一空间的长度的组合来执行对多个数据模式中的任何数据模式的数据模式分类，并且是 使用与第一标记不相邻且位于第一空间附近的第二标记的长度进一步执行; 因此评估信息记录介质的再现信号质量。

公开(公告)号：US20100002556A1

公开(公告)日：2010-01-07

申请号：US12496096

申请日：2009-07-01

Applicant: Harumitsu MIYASHITA ,  Yasumori Hino ,  Junya Shiraishi ,  Shoei Kobayashi

Inventor： Harumitsu MIYASHITA ,  Yasumori Hino ,  Junya Shiraishi ,  Shoei Kobayashi

IPC: G11B7/00

CPC classification number: G11B20/10009 ,  G11B20/10027 ,  G11B20/10046 ,  G11B20/10055 ,  G11B20/1012 ,  G11B20/10212 ,  G11B20/10277 ,  G11B20/10296 ,  G11B20/10361 ,  G11B20/1037 ,  G11B20/10398 ,  G11B20/10425 ,  G11B20/10472 ,  G11B20/10481 ,  G11B20/1816 ,  G11B20/182 ,  G11B20/22 ,  G11B2220/2541

Abstract: A reproduction signal evaluation method for evaluating quality of a reproduction signal reproduced from an information recording medium based on a binary signal generated from the reproduction signal using a PRML signal processing system, includes: a pattern extraction step of extracting, from the binary signal, a specific state transition pattern which has the possibility of causing a bit error; a step of computing a differential metric based on the binary signal; an extraction step of extracting the differential metric which is not greater than a predetermined signal processing threshold; a step of determining a mean value of the differential metrics which are not greater than the signal processing threshold and extracted in the extraction step; a standard deviation computing step of determining a standard deviation which corresponds to an error rate predicted from the mean value; and an evaluation step of evaluating a quality of the reproduction signal using the standard deviation.

Abstract translation: 一种用于基于使用PRML信号处理系统从再现信号产生的二进制信号从信息记录介质再现的再现信号的质量评估的再现信号评估方法，包括：模式提取步骤，从二进制信号中提取 具有导致位错误的可能性的特定状态转换模式; 基于二进制信号计算差分度量的步骤; 提取步骤，提取不大于预定信号处理阈值的差分度量; 确定不大于信号处理阈值并在提取步骤中提取的差分度量的平均值的步骤; 标准偏差计算步骤，用于确定与从所述平均值预测的误差率对应的标准偏差; 以及评估步骤，使用标准偏差来评估再现信号的质量。

公开(公告)号：US20100054097A1

公开(公告)日：2010-03-04

申请号：US12613833

申请日：2009-11-06

Applicant: Harumitsu MIYASHITA ,  Takeshi Nakajima ,  Mamoru Shoji ,  Yasumori Hino

Inventor： Harumitsu MIYASHITA ,  Takeshi Nakajima ,  Mamoru Shoji ,  Yasumori Hino

IPC: G11B7/12

CPC classification number: G11B7/1267 ,  G11B7/0053 ,  G11B7/0062 ,  G11B7/00736

Abstract: A recording/reproduction apparatus, comprising a first recording section for recording test information onto a medium using at least one recording power, a reproduction section for reproducing at least one test signal indicating the test information from the medium, and a second recording section for recording information onto the medium using one of the at least one recording power. The reproduction section comprises a decoding section for performing maximum likelihood decoding of the at least one test signal and generating at least one binary signal indicating a result of the maximum likelihood decoding, a calculation section for calculating a reliability of the result of the maximum likelihood decoding based on the at least one test signal and the at least one binary signal, and an adjustment section for adjusting a recording power for recording the information onto the medium to the one recording power based on the reliability.

Abstract translation: 一种记录/再现装置，包括用于使用至少一个记录功率将测试信息记录在介质上的第一记录部分，用于从介质再现指示测试信息的至少一个测试信号的再现部分和用于记录的第二记录部分 使用所述至少一个记录功率之一将信息传送到介质上。 再现部分包括：解码部分，用于对所述至少一个测试信号执行最大似然解码，并产生指示最大似然解码结果的至少一个二进制信号;计算部分，用于计算最大似然解码结果的可靠性 基于所述至少一个测试信号和所述至少一个二进制信号，以及调整部分，用于基于所述可靠性调整用于将所述信息记录到所述介质上的记录功率与所述一个记录功率。

公开(公告)号：US20090010121A1

公开(公告)日：2009-01-08

申请号：US12163563

申请日：2008-06-27

Applicant: Harumitsu MIYASHITA ,  Junichi Minamino ,  Takeshi Nakajima

Inventor： Harumitsu MIYASHITA ,  Junichi Minamino ,  Takeshi Nakajima

IPC: G11B27/36

CPC classification number: G11B7/00736 ,  G11B7/004 ,  G11B7/005 ,  G11B7/0053 ,  G11B19/12

Abstract: An information processing device (225) is a device for processing specific information recorded to a recording medium (100), and has a characteristic identification unit (204) and a processing unit (226). The characteristic identification unit (204) identifies the reflection characteristic of the recording medium (100). The processing unit (226) processes the specific information recorded to the recording medium (100) according to the identified reflection characteristic. The reflection characteristic is either a first characteristic such that the reflectance of light reflected by a recorded region of the recording medium (100) (referred to as first reflectance) is greater than the reflectance of light reflected by an unrecorded region of the recording medium (100) (referred to as second reflectance), or a second characteristic such that the first reflectance is less than the second reflectance.

Abstract translation: 信息处理装置（225）是用于处理记录在记录介质（100）上的特定信息的装置，具有特征识别部（204）和处理部（226）。 特征识别单元（204）识别记录介质（100）的反射特性。 处理单元（226）根据所识别的反射特性来处理记录到记录介质（100）的特定信息。 反射特性是由记录介质（100）的记录区域反射的光的反射率（被称为第一反射率）大于由记录介质的未记录区域反射的光的反射率的第一特性（ 100）（称为第二反射率）或第二特性，使得第一反射率小于第二反射率。

公开(公告)号：US20090154315A1

公开(公告)日：2009-06-18

申请号：US12327119

申请日：2008-12-03

Applicant: Harumitsu MIYASHITA ,  Yasumori HINO ,  Atsushi NAKAMURA ,  Mamoru SHOJI ,  Kanji OHNISHI

Inventor： Harumitsu MIYASHITA ,  Yasumori HINO ,  Atsushi NAKAMURA ,  Mamoru SHOJI ,  Kanji OHNISHI

IPC: G11B7/00

CPC classification number: G11B7/00736 ,  G11B7/0062 ,  G11B7/1267

Abstract: An information storage medium according to the present invention is adapted for multiple different writing speeds and stores in advance writing conditions associated with each of the multiple writing speeds. The writing conditions include: a recording-power-related parameter and a write-waveform-related parameter, which are associated with each particular writing speed to perform a write operation at the particular writing speed; and another recording-power-related parameter for performing a write operation at a different writing speed other than the particular one using the recording-power-related parameter for performing the write operation at the particular writing speed.

Abstract translation: 根据本发明的信息存储介质适用于多种不同的写入速度，并且预先存储与多个写入速度中的每一个相关联的写入条件。 写入条件包括：记录功率相关参数和与写入波形相关的参数，其与每个特定写入速度相关联，以特定写入速度执行写入操作; 以及另一个记录功率相关参数，用于使用与特定写入速度执行写入操作的记录功率相关参数以不同于特定写入速度的不同写入速度执行写入操作。

公开(公告)号：US20090103412A1

公开(公告)日：2009-04-23

申请号：US12249978

申请日：2008-10-13

Applicant: Harumitsu MIYASHITA ,  Takeshi Nakajima ,  Naohiro Kimura

Inventor： Harumitsu MIYASHITA ,  Takeshi Nakajima ,  Naohiro Kimura

IPC: G11B20/10

CPC classification number: G11B7/0062 ,  G11B7/00456 ,  G11B20/10009 ,  G11B20/10055 ,  G11B20/10111 ,  G11B20/10481 ,  G11B20/1403

Abstract: A recording control apparatus includes a waveform rectification section for receiving a digital signal generated from an analog signal representing information reproduced from an information recording medium, and rectifying a waveform of the digital signal; a maximum likelihood decoding section for performing maximum likelihood decoding of the digital signal having the waveform thereof rectified, and generating a binary signal representing a result of the maximum likelihood decoding; a reliability calculation section for calculating a reliability of the result of the maximum likelihood decoding based on the digital signal having the waveform thereof rectified and the binary signal; and an adjusting section for adjusting a shape of a recording signal for recording the information on the information recording medium based on the calculated reliability.

Abstract translation: 一种记录控制装置，包括：波形整流部分，用于接收从表示从信息记录介质再现的信息的模拟信号产生的数字信号，并整流数字信号的波形; 最大似然解码部分，用于对其波形进行整流的数字信号进行最大似然解码，并生成表示最大似然解码结果的二进制信号; 可靠性计算部分，用于基于其整流波形的数字信号和二进制信号来计算最大似然解码结果的可靠性; 以及调整部，用于基于所计算的可靠性来调整用于将信息记录在信息记录介质上的记录信号的形状。