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91. 发明授权

US06983022B2 Method and apparatus for modulating and demodulating data into a variable-length code and providing a sync signal to the train of codes 失效
标题翻译：用于将数据调制和解调为可变长度代码并向代码串提供同步信号的方法和装置
公开(公告)号：US06983022B2
公开(公告)日：2006-01-03
申请号：US11077878
申请日：2005-03-10
申请人： Toshiyuki Nakagawa , Yoshihide Shimpuku , Tatsuya Narahara
发明人： Toshiyuki Nakagawa , Yoshihide Shimpuku , Tatsuya Narahara
IPC分类号： H04B14/04
CPC分类号： G11B20/1426 , G11B20/1403 , G11B2020/1287 , G11B2020/1453 , G11B2020/1457 , H03M5/145 , H04L7/0083 , H04L7/041 , H04L7/044
摘要： A data-modulating apparatus for modulating data having a basic data length of m bits, to a variable-length code(d, k; m, n: r) having a basic code length of n bits. A sync signal is added to a recieved train of codes after a minimum run, the sync signal having a pattern that breaks a maximum run. The pattern is repeated twice continuously, and the minimum run is repeated no more than six times. The first bit of the sync signal is “1” when the train of modulated codes that immediately precedes the sync signal is included in the termination table used to terminate, at a desired position, a code when less than a predetermined number of variable length codes are available.
摘要翻译：一种用于将具有m比特的基本数据长度的数据调制为具有n比特的基本码长度的可变长度码（d，k; m，n：r）的数据调制装置。在最小运行之后，将同步信号添加到接收的代码序列，同步信号具有中断最大运行的模式。该图案连续重复两次，最小运行重复不超过六次。当紧接在同步信号之前的调制码序列包括在终止表中时，同步信号的第一位为“1”，用于当期望位置在小于预定数量的可变长度码时终止代码可用。

92. 发明申请

US20050168355A1 Method and apparatus for modulating and demodulating data into a variable length code and a providing medium for implementing the method 有权
公开(公告)号：US20050168355A1
公开(公告)日：2005-08-04
申请号：US11088464
申请日：2005-03-24
申请人： Toshiyuki Nakagawa , Yoshihide Shimpuku , Tatsuya Narahara
发明人： Toshiyuki Nakagawa , Yoshihide Shimpuku , Tatsuya Narahara
IPC分类号： H03M7/14 , G11B20/14 , H03M5/14 , H04L7/00 , H04L7/04 , H03M7/00 , H03M7/40
CPC分类号： G11B20/1426 , G11B20/1403 , G11B2020/1287 , G11B2020/1453 , G11B2020/1457 , H03M5/145 , H04L7/0083 , H04L7/041 , H04L7/044
摘要： A SYNC bit inserting section 14 adds a sync signal to a train of codes, after adding a minimum run, said sync signal having a pattern that breaks a maximum run. It is thereby possible to provide a reliable sync signal pattern.

93. 发明申请

US20050162291A1 Method and apparatus for modulating and demodulating data into a variable length code and a providing medium for implementing the method 有权
公开(公告)号：US20050162291A1
公开(公告)日：2005-07-28
申请号：US11088350
申请日：2005-03-24
申请人： Toshiyuki Nakagawa , Yoshihide Shimpuku , Tatsuya Narahara
发明人： Toshiyuki Nakagawa , Yoshihide Shimpuku , Tatsuya Narahara
IPC分类号： H03M7/14 , G11B20/14 , H03M5/14 , H04L7/00 , H04L7/04 , H03M7/00
CPC分类号： G11B20/1426 , G11B20/1403 , G11B2020/1287 , G11B2020/1453 , G11B2020/1457 , H03M5/145 , H04L7/0083 , H04L7/041 , H04L7/044
摘要： A SYNC bit inserting section 14 adds a sync signal to a train of codes, after adding a minimum run, said sync signal having a pattern that breaks a maximum run. It is thereby possible to provide a reliable sync signal pattern.

94. 发明授权

US06496541B1 Modulation apparatus/method, demodulation apparatus/method and program presenting medium 有权
标题翻译：调制装置/方法，解调装置/方法和程序呈现介质
公开(公告)号：US06496541B1
公开(公告)日：2002-12-17
申请号：US09320812
申请日：1999-05-27
申请人： Josephus A. H. M. Kahlman , Kornelis A. Schouhamer Immink , Gijsbert J. Van Den Enden , Toshiyuki Nakagawa , Yoshihide Shinpuku , Tatsuya Narahara , Kosuke Nakamura
发明人： Josephus A. H. M. Kahlman , Kornelis A. Schouhamer Immink , Gijsbert J. Van Den Enden , Toshiyuki Nakagawa , Yoshihide Shinpuku , Tatsuya Narahara , Kosuke Nakamura
IPC分类号： H03M702
CPC分类号： G11B20/1426 , G11B2020/1453 , H03M5/145
摘要： A DSV control bit determining/inserting unit inserts DSV control bits into an input data string and outputs the string including the DSV control bits to a modulation unit which converts the string with basic data length of 2 bits into variable length code with basic code length of 3 bits in accordance with a conversion table and outputs the code resulting from the conversion to a NRZI encoding unit. The conversion table includes substitution codes for limiting the number of consecutive appearances of a minimum run and substitution codes for keeping a run length limit. The conversion table enforces a conversion rule: the remainder of division of the “1” count of an element in a data string by 2 having a value of 0 or 1 equals the remainder of division of the “1” count of an element in the code resulting from conversion of the data string by 2.
摘要翻译： DSV控制位确定/插入单元将DSV控制位插入到输入数据串中，并将包括DSV控制位的串输出到调制单元，该调制单元将基本数据长度为2位的字符串转换为基本码长度为 3比特，并将从转换得到的代码输出到NRZI编码单元。转换表包括用于限制最小运行的连续出现次数的替代代码和用于保持游程长度限制的替代代码。转换表强制执行转换规则：数据字符串中元素“1”计数的剩余余数除以2，值为0或1等于等于1中元素的“1”计数的余数由数据字符串转换得到的代码为2。

95. 发明授权

US06367049B1 Encoding multiword information by wordwise interleaving 有权
标题翻译：通过文字交错编码多字信息
公开(公告)号：US06367049B1
公开(公告)日：2002-04-02
申请号：US09361073
申请日：1999-07-26
申请人： Marten E. Van Dijk , Ludovicus M. G. M. Tolhuizen , Josephus A. H. M. Kahlman , Constant P. M. J. Baggen , Masayuk Hattori , Kouhei Yamamoto , Tatsuya Narahara , Susumu Senshu
发明人： Marten E. Van Dijk , Ludovicus M. G. M. Tolhuizen , Josephus A. H. M. Kahlman , Constant P. M. J. Baggen , Masayuk Hattori , Kouhei Yamamoto , Tatsuya Narahara , Susumu Senshu
IPC分类号： G06F1110
CPC分类号： H03M13/2954 , G11B20/1833 , G11B20/1866 , G11B2020/1272 , G11B2020/1846
摘要： Multiword information is based on multibit symbols disposed in relative contiguity with respect to a medium, and is encoded with a wordwise interleaving and wordwise error protection code for providing error locative clues across multiword groups. In particular, the clues originate in high protectivity clue words (BIS) that are interleaved among clue columns, and also in synchronizing columns constituted from synchronizing bit groups. The synchronizing columns are located where the clue columns are relatively scarcer disposed. The clues are directed to low protectivity target words (LDS) that are interleaved in a substantially uniform manner among target columns which form uniform-sized column groups between periodic arrangements of clue columns and synchronizing columns.
摘要翻译：多字信息基于相对于介质相对邻接地布置的多位符号，并且用用于提供跨越多个组的错误定位线索的字交错和文字错误保护码进行编码。特别地，线索起源于在线索列之间交错的高保护性线索词（BIS），以及在由同步位组构成的同步列中。同步列位于线索列相对较少设置的位置。这些线索针对在目标列之间以基本均匀的方式交错的低保护性目标词（LDS），其在线索列和同步列的周期性布置之间形成均匀大小的列组。

96. 发明授权

US06313764B1 Demodulating device, demodulating method and transmission medium 有权
标题翻译：解调装置，解调方式和传输介质
公开(公告)号：US06313764B1
公开(公告)日：2001-11-06
申请号：US09154528
申请日：1998-09-17
申请人： Toshiyuki Nakagawa , Tatsuya Narahara , Yoshihide Shinpuku
发明人： Toshiyuki Nakagawa , Tatsuya Narahara , Yoshihide Shinpuku
IPC分类号： H03M700
CPC分类号： H03M5/145 , G11B20/10009 , G11B20/1426
摘要： According to the present invention, in the demodulating device, demodulating method and transmitting medium, a channel bit sequence of a variable length code having a minimum run d of 1 or more was decoded to a data sequence, and a code assigned to limit the minimum run d from repeating a predetermined number of times in the channel bit sequence of the variable length code was decoded to a data sequence. Design is therefore easier from the viewpoint of clock reproduction. When all the elements in the table contain a “1” representing an edge, data can be decoded more reliably. Further, when omissions are made in the codes in the table up to d bits from the code sequence lengths of the restriction lengths, data can be decoded more reliably. Thus, a clock is stably reproduced.
摘要翻译：根据本发明，在解调装置中，解调方法和发送介质中，将具有1或更小的最小游程d的可变长度码的信道比特序列解码为数据序列，并且分配用于限制最小值的码在可变长度代码的通道位序列中重复预定次数的运行d被解码为数据序列。因此，从时钟再现的角度来看，设计更容易。当表中的所有元素包含表示边缘的“1”时，可以更可靠地解码数据。此外，当从限制长度的代码序列长度到D位中，在表中的代码中省略多达d位时，可以更可靠地解码数据。因此，稳定地再现时钟。

97. 发明授权

US06225921B1 Device for encoding/decoding n-bit source words into corresponding m-bit channel words, and vice versa 有权
标题翻译：将n位源字编码/解码为相应的m位通道字的装置，反之亦然
公开(公告)号：US06225921B1
公开(公告)日：2001-05-01
申请号：US09177957
申请日：1998-10-23
申请人： Josephus A. H. M. Kahlman , Kornelis A. Schouhamer Immink , Gijsbert J. Van Den Enden , Toshiyuki Nakagawa , Yoshihide Shimpuku , Tatsuya Narahara , Kousuke Nakamura
发明人： Josephus A. H. M. Kahlman , Kornelis A. Schouhamer Immink , Gijsbert J. Van Den Enden , Toshiyuki Nakagawa , Yoshihide Shimpuku , Tatsuya Narahara , Kousuke Nakamura
IPC分类号： H03M500
CPC分类号： G11B20/1426 , H03M5/145
摘要： A device is disclosed for encoding a stream of databits of a binary source signal (S) into a stream of databits of a binary channel signal (C) satisfying a (d,k) constraint, wherein the bitstream of the source signal is divided into n-bit source words (x1, x2), which device comprises converting means (CM) adapted to convert said source words into corresponding m-bit channel words (Y1, Y2, Y2). The converting means (CM) are further adapted to convert n-bit source words into corresponding m-bit channel words, such that the conversion for each n-bit source word is parity preserving (table I). The relations hold that m>n≧1, p≧1, and that p can vary. Preferably, m=n+1. Further, a sync word generator (9) is available for generating a q-bit sync word also satisfying said (d,k) constraint, the said sync word starting with a ‘0’ bit and ending with a ‘0’ bit, the device further comprising merging means (19) for merging said sync word in said stream of databits of the binary channel signal, and that q is an integer value larger than k. (FIG. 1) Further, a decoding device is disclosed for decoding the channel signal obtained by means of the encoding device.
摘要翻译：公开了一种用于将二进制源信号（S）的数据位流编码为满足（d，k）约束的二进制信道信号（C）的数据位流的装置，其中源信号的比特流被分为 n位源字（x1，x2），该装置包括适于将所述源字转换成对应的m位通道字（Y1，Y2，Y2）的转换装置（CM）。转换装置（CM）还适于将n位源字转换成相应的m位通道字，使得每个n位源字的转换是奇偶校验（表I）。关系认定m> n> = 1，p> = 1，p可以变化。优选地，m = n + 1。此外，同步字生成器（9）可用于生成也满足所述（d，k）约束的q位同步字，所述同步字以“0”位开始并以“0”位结束，装置还包括用于在所述二进制信道信号的所述数据位流中合并所述同步字，并且所述q是大于k的整数值的合并装置（19）。（图1）此外，公开了一种解码装置，用于对通过编码装置获得的信道信号进行解码。

98. 发明授权

US5239528A Optical head control circuit for optical tape recording/reproducing apparatus 失效
标题翻译：光学记录/再现设备的光头控制电路
公开(公告)号：US5239528A
公开(公告)日：1993-08-24
申请号：US581800
申请日：1990-09-13
申请人： Tatsuya Narahara , Yoshiteru Kamatani , Kiyoshi Ohsato , Hiroshi Miyoshi
发明人： Tatsuya Narahara , Yoshiteru Kamatani , Kiyoshi Ohsato , Hiroshi Miyoshi
IPC分类号： G11B7/09 , G11B7/003
CPC分类号： G11B7/0031
摘要： A control circuit for controlling the position of a head in an optical tape recording/reproducing device having a rotary optical head controls the position of the head at the instant that it faces the tape based upon a desired head position derived from a preceding period in which it was facing the tape. A head position error signal is sampled and added to a sample head position signal during a period when the head is facing the tape and is held during the time the head is not facing the tape. The instant the head begins to face the tape once again, this desired value that has been held is applied to the head in order to reduce the pull-in time of the control circuit and provide more time for information recording/reproduction during the time the rotary optical head is facing the tape.

99. 发明授权

US5046061A Optical light beam scanner with zero order beam reflector 失效
标题翻译：具有零级光束反射器的光学光束扫描仪
公开(公告)号：US5046061A
公开(公告)日：1991-09-03
申请号：US232690
申请日：1988-08-16
申请人： Masahiko Chaya , Tatsuya Narahara
发明人： Masahiko Chaya , Tatsuya Narahara
IPC分类号： G11B7/12 , G11B7/135
CPC分类号： G11B7/12 , G11B7/1353
摘要： An optical recording and/or reproducing apparatus employs an optical tape, an optical disc or the like as a record medium. The apparatus comprises an acousto-optic deflector which receives a light beam and generates a zero order beam which passes straight through the deflector and a first order beam which is deflected by the deflector. The zero and first order beams are separated from each other by a polarized beam splitter. The first order beam is projected via a 1/4 wavelength plate onto an optical record medium, while the zero order beam, which does not contribute to recording or reproduction of information signals, is shunted aside so that it does not reach the optical record medium. The reflected light beam from the optical record medium is extracted by the same polarized beam splitter and used for reproduction of the information signals.
摘要翻译：光学记录和/或再现装置使用光学带，光盘等作为记录介质。该装置包括声光偏转器，其接收光束并产生直接通过偏转器的零级光束和由偏转器偏转的第一级光束。零级和一级光束通过偏振分束器彼此分离。第一级光束通过1/4波长板投射到光学记录介质上，而不对信息信号的记录或再现有贡献的零级光束被分流，使得其不到达光学记录介质。来自光学记录介质的反射光束被相同的偏振光束分离器提取，并用于信息信号的再现。

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