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1.发明授权Method and apparatus for recording and reproducing a plurality of bits on a magnetic tape 失效用于在磁带上记录和再现多个位的方法和装置
公开(公告)号：US4302783A
公开(公告)日：1981-11-24
申请号：US100344
申请日：1979-12-05
CPC分类号： G11B5/09 , G11B20/1803 , G11B20/20
摘要： At least one bit of a digital signal including a plurality of bits to be simultaneously recorded on a plurality of tracks of a magnetic tape, is recorded on at least two tracks located at opposite sides with respect to a reference track. The reference track carries a reference signal utilized for producing a synchronous signal with which the plurality of bits are reproduced in synchronization. When reproducing, a.c. signals derived from the two corresponding tracks having the simultaneously recorded bits are added to each other whereby the phase difference of the plurality of bits with respect to the reference signal is compensated while drop out phenomenon is reduced.
摘要翻译： 包括要同时记录在磁带的多个轨道上的多个位的数字信号的至少一位被记录在相对于参考轨道位于相对侧的至少两个磁道上。 参考轨道携带用于产生同步信号的参考信号，同步信号同步地再现多个位。 再现时， 从具有同时记录的比特的两个对应轨道导出的信号彼此相加，从而相对于参考信号的多个比特的相位差被补偿，同时丢弃现象减少。
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2.发明授权Method and apparatus for encoding low redundancy check words from source data 失效用于从源数据编码低冗余校验字的方法和装置
公开(公告)号：US4375100A
公开(公告)日：1983-02-22
申请号：US199703
申请日：1980-10-23
CPC分类号： H03M13/29 , G11B20/1809 , G11B20/1876
摘要： Source data is organized by a time compression memory (4) into a plurality of successive groups of data words arranged in a pattern of rows and columns with the rows corresponding to respective recording tracks. A plurality of successive groups of parity check words is provided in the same pattern of rows and columns as the data words subsequent to the data word groups. Each parity check word is derived in a parity generator (6) by modulo-2 summations from the data words selected from different data word groups. The data and check words of each row of each respective group are (a) preceded by a synchronization code provided by a sync generator (10) to allow differentiation between data and parity groups, and (b) followed by a cyclic redundancy check, (CRC) code provided by a CRCC generator (9) to allow detection of an error in that data row or check words. The parity check word is used to correct an error specified by the CRC code upon detection of an error.
摘要翻译： 源数据由时间压缩存储器（4）组织成以与各个记录磁道相对应的行和列的图案排列的多个连续的数据字组。 多个连续的奇偶校验字组被提供在与数据字组后面的数据字相同的行和列的模式中。 每个奇偶校验字通过从不同数据字组中选择的数据字的模2求和在奇偶生成器（6）中导出。 每个相应组的每行的数据和检查字是（a）在由同步发生器（10）提供的同步码之前，以允许数据和奇偶校验组之间的区分，以及（b）后跟循环冗余校验（ CRC）代码由CRCC发生器（9）提供，以允许检测该数据行中的错误或检查字。 奇偶校验字用于在检测到错误时纠正由CRC码指定的错误。
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公开(公告)号：US4809087A
公开(公告)日：1989-02-28
申请号：US124434
申请日：1987-11-23
摘要： In a magnetic recording and reproducing device having at least one rotating magnetic head for recording and reproducing video signal and digital form audio signal in a contiguous manner along each track which is inclined at an angle relative to the direction of travel of a magnetic tape, a discriminator signal is combined to the digital form audio signal. The discrimination signal has a first section carrying a check code and a second section carrying information. During the reproducing mode, the discrimination signal is detected such that the information carried in the second section is made invalid when the check code has a predetermined code pattern, and the information carried in the second section is made valid when the check code has a code pattern other than the predetermined code pattern. Furthermore, the check code is used to indicate the type of information contained in the second section.
摘要翻译： 在具有至少一个旋转磁头的磁记录和再现装置中，用于以相对于磁带行进方向倾斜一个角度的每个轨迹以连续的方式记录和再现视频信号和数字形式的音频信号， 鉴频器信号被组合到数字形式的音频信号。 鉴别信号具有携带检查码的第一部分和携带信息的第二部分。 在重放模式下，检测识别信号，使得当检查码具有预定的码型时，在第二部分中携带的信息变得无效，并且当检查码具有代码时，在第二部分中携带的信息有效 图案以外的预定代码图案。 此外，检查码用于指示第二部分中包含的信息的类型。
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公开(公告)号：US4544962A
公开(公告)日：1985-10-01
申请号：US394766
申请日：1982-07-02
申请人： Misao Kato , Yasuharu Shimeki , Hiroshi Matsushima , Shiro Tsuji , Nobuyoshi Kihara , Yoshinori Amano
发明人： Misao Kato , Yasuharu Shimeki , Hiroshi Matsushima , Shiro Tsuji , Nobuyoshi Kihara , Yoshinori Amano
CPC分类号： H04L25/4908 , G11B20/1426
摘要： A method is disclosed for processing binary data prior to magnetic recording. The binary data is divided into 4-bit data segments which are converted to 8-bit codes according to a predetermined encoding transfer function describing the relationships between the 4-bit data segments and corresponding 8-bit codes, wherein the bit pattern of each 8-bit code has an intra-code run-length of at least two "0" bits and forms an inter-code run-length of from at least two "0" bits to at most nine "0"bits with an adjacent 8-bit code. The method further includes the step of generating a frame synchronization code and interleaving it with 8-bit codes to form a frame of binary digits. The frame sync code has a bit pattern which is unduplicatable by any combination of 8-bit codes that follow.
摘要翻译： 公开了用于在磁记录之前处理二进制数据的方法。 根据描述4位数据段和对应的8位代码之间的关系的预定编码传递函数将二进制数据划分为4位数据段，将其转换为8位代码，其中每8位数据段的位模式 比特码具有至少两个“0”比特的码内游程长度，并且形成从至少两个“0”比特到最多九个“0”比特的码间游程长度， 位代码。 该方法还包括产生帧同步码并用8位代码进行交织以形成二进制数字的帧的步骤。 帧同步码具有通过随后的8位代码的任何组合不可重复的位模式。
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公开(公告)号：US4146099A
公开(公告)日：1979-03-27
申请号：US823705
申请日：1977-08-11
CPC分类号： G11B20/1813
摘要： Signal recording method and apparatus for efficiently correcting a bit error due to dropout occurred in recording an analog data into a digital data and reproducing the digital data is disclosed. The digital signal converted from the analog signal is divided into a plurality of groups to each of which a parity check bit is added. Record pattern is recorded on a record medium by a recording apparatus in accordance with a regular coding such as FM (frequency modulation) or MFM (modified frequency modulation) coding such that more than one bits in a group are not simultaneously influenced by the dropout, e.g. individual bits in a group are spaced from each other by several tracks. On reproducing, the coded digital signal is decoded into the original digital signal and the dropout is detected utilizing the nature of the regularity of the coding. The parity is checked for each of the groups. In this a single error in the group can be corrected and a double error is supplemented by holding a previous value, whereby the error due to the dropout is reduced.
摘要翻译： 公开了一种用于在将模拟数据记录到数字数据并再现数字数据时发生的用于有效地校正由于压差引起的位误差的信号记录方法和装置。 从模拟信号转换的数字信号被分成多个组，每个组中加上奇偶校验位。 根据诸如FM（频率调制）或MFM（修改的频率调制）编码的常规编码，记录装置将记录模式记录在记录介质上，使得一组中多于一位不同时受到丢失的影响， 例如 组中的各个位彼此间隔几个轨道。 在再现时，编码的数字信号被解码成原始数字信号，并且利用编码的规律性的特性来检测压差。 检查每个组的奇偶校验。 在这种情况下，可以纠正组中的单个错误，并通过保持先前的值来补充双重错误，从而降低由于退出引起的错误。
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公开(公告)号：US4549167A
公开(公告)日：1985-10-22
申请号：US585589
申请日：1984-03-02
CPC分类号： G11B20/1426
摘要： A method of encoding and decoding binary data, comprising the steps of: dividing the binary data into 2-bit data groups, converting each 2-bit data group into a 5-bit code having a minimum of 4 consecutive bits "0" between a bit "1" and the next bit "1", and converting reversely the encoded 5-bit codes into the original binary data with reference to another 5-bit codes located forwardly of and rearwardly of the 5-bit code. By employing this method, it becomes possible to obtain a density twice higher than that of "MFM" method.
摘要翻译： 一种对二进制数据进行编码和解码的方法，包括以下步骤：将二进制数据划分为2位数据组，将每个2位数据组转换成5位代码，其中最小为4位连续位“0” 位“1”和下一位“1”，并且参考位于5位代码前后的另一个5位代码，将编码的5位代码逆向转换为原始二进制数据。 通过采用该方法，可以获得比“MFM”方法高两倍的浓度。
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公开(公告)号：US4525753A
公开(公告)日：1985-06-25
申请号：US498515
申请日：1983-05-26
CPC分类号： G11B20/10212 , G11B20/10 , G11B20/1423 , G11B5/09
摘要： In a magnetic recording/reproducing apparatus having a multi-track head for writing a digital signal on a magnetic recording medium, a plurality of head of the multi-track head is electrically divided into a plurality of groups which are respectively driven by writing currents produced in accordance with a plurality of modulated signals indicative of input digital data. The writing currents fed to the heads of the same group are produced in response to a pulse signal such that a plurality of pulse signals having different phases are used for respective groups. The head in the same group are positioned so that they are not adjacent to each other, and therefore, undesirable crosstalk can be reduced because heads corresponding to adjacent tracks are prevented from being driven simultaneously, while the entire writing current power can be reduced. The waveform of each of the writing currents may be controlled in accordance with the period of level inversion of the modulated signals, and therefore, peak shift phenomena due to waveform interference can be reduced.
摘要翻译： 在具有用于在磁记录介质上写入数字信号的多磁道磁头的磁记录/再现装置中，多轨磁头的多个磁头被电分为多个组，这些组分别由产生的写入电流驱动 根据指示输入数字数据的多个调制信号。 馈送到相同组的头部的写入电流响应于脉冲信号产生，使得具有不同相位的多个脉冲信号被用于相应的组。 相同组中的头部被定位成使得它们不彼此相邻，因此，可以减少不期望的串扰，因为与相邻轨道相对应的磁头被阻止同时被驱动，同时可以减小整个写入电流功率。 可以根据调制信号的电平反转周期来控制每个写入电流的波形，因此可以减少由波形干扰引起的峰值偏移现象。
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公开(公告)号：US5689583A
公开(公告)日：1997-11-18
申请号：US652845
申请日：1996-05-23
CPC分类号： G06K9/72 , G06K2209/01
摘要： A character recognition unit recognizes a document image to output character candidates; a character correction unit selects a corrected character string which is correct with respect to grammar and vocabulary, from a set of character candidates from the character recognition unit; a keyword extraction unit extracts keywords of a document to be recognized, from the corrected character string; and wherein the character correction unit selects the corrected character string by a use of BUNSETSU evaluation representing correctness with respect to grammar and vocabulary, and an evaluation of the BUNSETSU is increased when the BUNSETSU has the keyword outputted from the keyword extraction unit.
摘要翻译： 字符识别单元识别文档图像以输出角色候选; 字符校正单元从字符识别单元从一组字符候选中选择相对于语法和词汇表正确的校正字符串; 关键词提取单元从修正后的字符串中提取要识别的文档的关键字; 并且其中所述字符校正单元通过使用表示关于语法和词汇表的正确性的BUNSETSU评估来选择所述校正字符串，并且当所述BUNSETSU具有从所述关键词提取单元输出的关键字时，增加所述BUNSETSU的评估。
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公开(公告)号：US5479570A
公开(公告)日：1995-12-26
申请号：US130851
申请日：1993-10-04
CPC分类号： G06N3/08 , G06K9/6807
摘要： A learning and recognition machine has a major classification section for classifying an input pattern into a plurality of category groups and calculating a group belongingness to each category group and a plurality of fine classification sections for calculating a similarity within each category group. The machine causes the plurality of fine classification sections to learn in a coordinated manner by reflecting the group belongingness of the input pattern to update of a weight factor implemented in the fine classification sections, thereby allowing a recognition rate of a pattern situated at the boundary of the category groups to be improved and an effective supplemental learning to be performed.
摘要翻译： 学习识别机具有主要的分类部分，用于将输入模式分类成多个类别组并计算每个类别组的属性，以及用于计算每个类别组内的相似度的多个精细分类部分。 机器使多个精细分类部通过反映输入图案的组属性来更新在精细分类部中实现的权重因子，从而以协调的方式学习，从而允许位于边界处的图案的识别率 要改进的类别组和有效的补充学习。
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公开(公告)号：US5987170A
公开(公告)日：1999-11-16
申请号：US965534
申请日：1997-11-06
申请人： Hiroshi Yamamoto , Hisao Niwa , Yoshihiro Kojima , Susumu Maruno , Kazuhiro Kayashima , Yasuharu Shimeki , Toshiyuki Kouda , Hidetsugu Maekawa , Satoru Ito
发明人： Hiroshi Yamamoto , Hisao Niwa , Yoshihiro Kojima , Susumu Maruno , Kazuhiro Kayashima , Yasuharu Shimeki , Toshiyuki Kouda , Hidetsugu Maekawa , Satoru Ito
IPC分类号： G06K9/72
CPC分类号： G06K9/726 , G06K2209/01
摘要： There is disclosed a character recognition machine adapted to recognize Japanese characters such as kanjis and kanas. The machine comprises a character string storage portion, a character extraction portion, a character recognition portion, and a language processing portion. A character string to be recognized is stored as an image in the storage portion. The character extraction portion comprises a network consisting a plurality of interconnected operators each of which has numerous inputs and outputs. An evaluation function which assumes its minimum value when a character extraction produces the best results is calculated by the operators simultaneously so as to minimize the value of the function. The character recognition portion calculates degrees of similarity of a character pattern to various character categories, the character pattern being applied from the character extraction portion. The language processing portion receives these degrees of similarity and selects a character category which seems to provide the most correct combination of characters in terms of vocabulary and grammar.
摘要翻译： 公开了一种适于识别诸如kanjis和kanas之类的日本字符的字符识别机。 机器包括字符串存储部分，字符提取部分，字符识别部分和语言处理部分。 要识别的字符串作为图像存储在存储部分中。 字符提取部分包括由多个互连操作器组成的网络，每个操作器具有许多输入和输出。 当字符提取产生最佳结果时，假设其最小值的评估函数由运算符同时计算，以便使函数的值最小化。 字符识别部分从字符提取部分计算字符图案与各种字符类别的相似度，字符图案被应用。 语言处理部分接收这些相似度，并且选择似乎在词汇和语法方面提供最正确的字符组合的字符类别。
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