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1. 发明授权

US06320916B1 Digital magnetic recording/reproducing apparatus 失效
标题翻译：数字磁记录/重放装置
公开(公告)号：US06320916B1
公开(公告)日：2001-11-20
申请号：US09185097
申请日：1998-11-03
申请人： Naoya Kobayashi , Seiichi Mita , Masaharu Kondo , Hideki Sawaguchi , Takashi Moriyasu
发明人： Naoya Kobayashi , Seiichi Mita , Masaharu Kondo , Hideki Sawaguchi , Takashi Moriyasu
IPC分类号： H03D100
CPC分类号： H03M13/6331 , G11B20/10 , G11B20/18 , H03M13/09 , H03M13/41 , H03M13/4115 , H03M13/4184 , H03M13/6343 , H03M13/6502 , H03M13/6505 , H04L25/03178
摘要： A digital magnetic recording/reproducing apparatus that has an LVA detector, and that is able to maintain the coding rate as high as {fraction (8/9)} or more, and record at a higher density than in the prior art, wherein, in order that the data sequences up to the (2n−1)th best sequence (n>1) are obtained in the order of higher likelihood ratios, and that. the candidates of those data sequences can be produced, the LVA detector has provided therein a unit which replaces the likelihood ratio and path memory of the ith best sequence by those of the (2i−1)th best sequence when the contents of the (i−1)th path memory coincide with those of the ith path memory (i=2, 3, . . . , n) and the absolute value of the likelihood ratio difference between the (i−1)th best sequence and the (2i−1)th best sequence is smaller than a decision threshold, or a unit which initializes the likelihood ratio of the ith best sequence to be a constant difference value added to the likelihood ratio of the (i−1)th best sequence when the contents of the (i−1)th path memory and the ith (i=2, 3, . . . , n) path memory of the n candidates of data sequences are coincident.
摘要翻译：具有LVA检测器的数字磁记录/再现装置，其能够将编码率保持为高达{分数（8/9）}或更大，并且以比现有技术更高的密度进行记录，其中，为了获得高达（2n-1）个最佳序列（n> 1）的数据序列是以较高似然比的顺序获得的。可以产生这些数据序列的候选，LVA检测器在其中提供了一个单元，其当第（i）个（i-1）的内容被替换为第（2i-1）个最佳序列时的第i个最佳序列的似然比和路径存储器 -1）路径存储器与第i路径存储器（i = 2,3，...，n）的路径存储器一致，并且第（i-1）个最佳序列与（2i）的最佳序列之间的似然比差的绝对值 -1）的最佳序列小于判定阈值，或将第i个最佳序列的似然比初始化为当第（i-1）个最佳序列的似然比加到内容的第i-1个最佳序列的似然比时的单位，（i-1）路径存储器和n个候选数据序列的第i（i = 2,3，...，n）路径存储器是一致的。

2. 发明授权

US06873665B2 Digital magnetic recording/reproducing apparatus 失效
标题翻译：数字磁记录/重放装置
公开(公告)号：US06873665B2
公开(公告)日：2005-03-29
申请号：US09887328
申请日：2001-06-25
申请人： Naoya Kobayashi , Seiichi Mita , Masaharu Kondo , Hideki Sawaguchi , Takashi Moriyasu
发明人： Naoya Kobayashi , Seiichi Mita , Masaharu Kondo , Hideki Sawaguchi , Takashi Moriyasu
IPC分类号： G11B20/14 , G11B20/10 , G11B20/18 , H03M13/09 , H03M13/23 , H03M13/41 , H04L25/03 , H04L25/08 , H03D1/00 , H04L27/06
CPC分类号： H03M13/6331 , G11B20/10 , G11B20/18 , H03M13/09 , H03M13/41 , H03M13/4115 , H03M13/4184 , H03M13/6343 , H03M13/6502 , H03M13/6505 , H04L25/03178
摘要： A digital magnetic recording/reproducing apparatus includes an LVA (List Viterbi Algorithm) detector which produces first to nth best sequences (n>1) of a decoded result, and replaces a likelihood ratio and a path memory of the ith best sequence (i=2, 3, . . . , n) with those of the (2i−1)th best sequence when contents of path memories of the (i−1)th and ith best sequences are equal to each other and an absolute value of a difference between likelihood ratios of the (i−1)th and (2i−1)th best sequences is smaller than a decision threshold. Alternatively, the LVA detector initializes a likelihood ratio of the ith best sequence to be a likelihood ratio of the (i−1)th best sequence with a constant difference value added thereto when contents of path memories of the (i−1)th and ith best sequences are equal to each other.
摘要翻译：一种数字磁记录/重放装置包括一个产生解码结果的第n至第n个最佳序列（n> 1）的LVA（List Viterbi Algorithm）检索器，并将第i个最佳序列（i = 2，3，...，n）与（i-1）和第i个最佳序列的路径存储器的内容彼此相等时的（2i-1）最佳序列的那些，绝对值（i-1）和（2i-1）最佳序列的似然比之间的差异小于判定阈值。或者，LVA检测器将第（i-1）个最佳序列的似然比初始化为第（i-1）个最佳序列的似然比，并且当第（i-1）和最好的序列彼此相等。

3. 发明授权

US06337889B1 Partial response demodulating method and apparatus using the same 失效
标题翻译：部分响应解调方法及其使用方法
公开(公告)号：US06337889B1
公开(公告)日：2002-01-08
申请号：US09124840
申请日：1998-07-30
申请人： Seiichi Mita , Hideki Sawaguchi , Naoya Kobayashi , Masaharu Kondo
发明人： Seiichi Mita , Hideki Sawaguchi , Naoya Kobayashi , Masaharu Kondo
IPC分类号： H04L2706
CPC分类号： G11B20/10055 , G11B5/012 , G11B5/09 , G11B20/10009 , H04L1/0054
摘要： In a data demodulating method, predetermined input data is based upon a response characteristic of the partial response class 4. The predetermined input data is discrete-filtered to thereby produce filtered asymmetrical data. The filtered asymmetrical data is maximum-likelihood-decoded to thereby produce decoded data that is demodulated. Further, a magnetic recording/reproducing apparatus is arranged by using this data demodulating method.
摘要翻译：在数据解调方法中，预定输入数据基于部分响应类别4的响应特性。预定输入数据被离散滤波，从而产生滤波后的非对称数据。滤波的不对称数据是最大似然解码的，从而产生被解调的解码数据。此外，通过使用该数据解调方法来布置磁记录/再现装置。

4. 发明授权

US07046745B2 Signal processing circuit 失效
标题翻译：信号处理电路
公开(公告)号：US07046745B2
公开(公告)日：2006-05-16
申请号：US09986925
申请日：2001-11-13
申请人： Seiichi Mita , Hideki Sawaguchi , Naoya Kobayashi , Masaharu Kondo
发明人： Seiichi Mita , Hideki Sawaguchi , Naoya Kobayashi , Masaharu Kondo
IPC分类号： H03D1/00 , H04B1/10 , G11B1/035
CPC分类号： G11B20/10055 , G11B5/012 , G11B5/09 , G11B20/10009 , H04L1/0054
摘要： In a data demodulating method, predetermined input data is demodulated based upon a response characteristic of the partial response class 4; the demodulated input data is discrete-filtered to thereby produce filtering data; and the filtering data is maximum likelihood-decoded to thereby produce asymmetrical response data. Further, a magnetic recording/reproducing apparatus is arranged by using this data demodulating method.
摘要翻译：在数据解调方法中，基于部分响应等级4的响应特性来解调预定输入数据; 解调输入数据被离散滤波，从而产生滤波数据; 并且滤波数据被最大似然解码，从而产生非对称响应数据。此外，通过使用该数据解调方法来布置磁记录/再现装置。

5. 发明授权

US06493846B1 Signal processing apparatus and method, and data recording/reproducing apparatus using the same 失效
标题翻译：信号处理装置和方法，以及使用该信号处理装置和方法的数据记录/再现装置
公开(公告)号：US06493846B1
公开(公告)日：2002-12-10
申请号：US09323703
申请日：1999-06-01
申请人： Masaharu Kondo , Seiichi Mita
发明人： Masaharu Kondo , Seiichi Mita
IPC分类号： H03M1303
CPC分类号： G11B20/1833 , G11B20/1426 , G11B2020/1446 , H03M13/31
摘要： A signal processing apparatus capable of reducing burst error generation, and a highly reliable data recording/reproducing apparatus using this signal processing apparatus. This signal processing apparatus has a simple error detection/correction circuit provided just before a modulated code demodulator, thereby correcting error of a pattern easy to occur in a maximum likelihood decoder. The simple error detection/correction circuit is an error detection/correction circuit using a linear error correction code, for example, an error correction code (CRCC) formed of a cyclic code. Thus the number of burst errors after the modulated code demodulator can be decreased.
摘要翻译：能够减少突发错误产生的信号处理装置，以及使用该信号处理装置的高度可靠的数据记录/再现装置。该信号处理装置具有在调制码解调器之前提供的简单的错误检测/校正电路，从而校正容易发生在最大似然解码器中的图案的误差。简单的错误检测/校正电路是使用线性纠错码（例如由循环码形成的纠错码（CRCC））的错误检测/校正电路。因此，可以减少调制码解调器之后的突发错误的数量。

6. 发明授权

US06842875B2 Signal processing apparatus and method, and data recording/reproducing apparatus using the same 失效
标题翻译：信号处理装置和方法，以及使用该信号处理装置和方法的数据记录/再现装置
公开(公告)号：US06842875B2
公开(公告)日：2005-01-11
申请号：US10269866
申请日：2002-10-15
申请人： Masaharu Kondo , Seiichi Mita
发明人： Masaharu Kondo , Seiichi Mita
IPC分类号： G11B20/14 , G11B20/18 , H03M13/00 , H03M13/31
CPC分类号： G11B20/1833 , G11B20/1426 , G11B2020/1446 , H03M13/31
摘要： A signal processing apparatus capable of reducing burst error generation, and a highly reliable data recording/reproducing apparatus using this signal processing apparatus. This signal processing apparatus has a simple error detection/correction circuit provided just before a modulated code demodulator, thereby correcting error of a pattern easy to occur in a maximum likelihood decoder. The simple error detection/correction circuit is an error detection/correction circuit using a linear error correction code, for example, an error correction code (CRCC) formed of a cyclic code. Thus the number of burst errors after the modulated code demodulator can be decreased.
摘要翻译：能够减少突发错误产生的信号处理装置，以及使用该信号处理装置的高度可靠的数据记录/再现装置。该信号处理装置具有在调制码解调器之前提供的简单的错误检测/校正电路，从而校正容易发生在最大似然解码器中的图案的误差。简单的错误检测/校正电路是使用线性纠错码（例如由循环码形成的纠错码（CRCC））的错误检测/校正电路。因此，可以减少调制码解调器之后的突发错误的数量。

7. 发明申请

US20050117871A1 Signal processing method and apparatus and disk device using the method and apparatus 审中-公开
公开(公告)号：US20050117871A1
公开(公告)日：2005-06-02
申请号：US11028047
申请日：2005-01-04
申请人： Yoshiju Watanabe , Masaharu Kondo
发明人： Yoshiju Watanabe , Masaharu Kondo
IPC分类号： G11B20/10 , G11B20/12 , G11B20/18 , G11B27/30 , H04L7/04 , H04N9/80
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/1217 , G11B20/1833 , G11B27/3027 , G11B2220/20 , H04L7/042
摘要： A signal processing circuit having a data sync signal detector and a disk device. Input data read from a magnetic disk is input to a data discriminator. A data discrimination output constituting a code bit output discriminated by the data discriminator is input to a post-coder the output of which is input to a decoder and a (1+D) processing unit. The processed output of the processing unit is input to an error detection/correction unit and separated into bit strings of odd numbered bits and even numbered bits, divided into groups. An error detection/correction output is input to a data sync signal detector, and matched against a sync pattern. When the number of coincident groups is greater than a threshold value, a sync signal is output and upon detection causes the decoder to demodulate the data.

8. 发明授权

US06728052B2 Recording/reproducing apparatus, error correcting coding method and information recording method 失效
标题翻译：记录/再现装置，纠错编码方法和信息记录方法
公开(公告)号：US06728052B2
公开(公告)日：2004-04-27
申请号：US09888645
申请日：2001-06-26
申请人： Masaharu Kondo , Terumi Takashi
发明人： Masaharu Kondo , Terumi Takashi
IPC分类号： G11B509
CPC分类号： H03M13/132 , G11B5/012 , G11B20/1866 , H03M13/1515 , H03M13/1525 , H03M13/158
摘要： A recording/reproducing apparatus for recording in a recording medium the interleaved data with an error correcting code added thereto and reproducing the recorded data from the recording medium, wherein the error correcting coding process is performed using an elliptic code on a finite field GF(2m) where m is a positive integer.
摘要翻译：一种记录/再现装置，用于在记录介质中记录具有添加到其中的纠错码的交织数据并从记录介质再现记录数据，其中使用有限域GF（2）上的椭圆码执行纠错编码处理）其中m是正整数。

9. 发明授权

US06856660B1 Signal processing method and apparatus and disk device using the method and apparatus 失效
标题翻译：使用该方法和装置的信号处理方法和装置以及盘装置
公开(公告)号：US06856660B1
公开(公告)日：2005-02-15
申请号：US09400856
申请日：1999-09-21
申请人： Yoshiju Watanabe , Masaharu Kondo
发明人： Yoshiju Watanabe , Masaharu Kondo
IPC分类号： G11B20/10 , G11B20/12 , G11B20/18 , G11B27/30 , H04L7/04 , H04L7/00
CPC分类号： G11B20/10055 , G11B20/10009 , G11B20/1217 , G11B20/1833 , G11B27/3027 , G11B2220/20 , H04L7/042
摘要： A signal processing circuit having a data sync signal detector and a disk device. Input data read from a magnetic disk is input to a data discriminator. A data discrimination output constituting a code bit output discriminated by the data discriminator is input to a post-coder the output of which is input to a decoder and a (1+D) processing unit. The processed output of the processing unit is input to an error detection/correction unit and separated into bit strings of odd numbered bits and even numbered bits, divided into groups. An error detection/correction output is input to a data sync signal detector, and matched against a sync pattern. When the number of coincident groups is greater than a threshold value, a sync signal is output and upon detection causes the decoder to demodulate the data.
摘要翻译：一种具有数据同步信号检测器和盘装置的信号处理电路。从磁盘读取的输入数据被输入到数据鉴别器。构成由数据鉴别器鉴别的码位输出的数据识别输出被输入到输出到解码器和（1 + D）处理单元的后置编码器。处理单元的处理输出被输入到错误检测/校正单元，并分成奇数位和偶数位的位串，被分成组。错误检测/校正输出被输入到数据同步信号检测器，并且与同步模式匹配。当同步组的数量大于阈值时，输出同步信号，一旦检测到解码器解调数据。

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