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公开(公告)号：US4590524A
公开(公告)日：1986-05-20
申请号：US553234
申请日：1983-11-18
CPC分类号： G11B20/10527 , G11B5/035
摘要： A multitrack PCM reproducing apparatus for reproducing PCM signals recorded on a plurality of tracks in a distributed relation, comprises a signal selector circuit sequentially selecting the PCM signals reproduced from the individual tracks, an A/D converter converting the reproduced signals selected by the signal selector circuit into digital signals, a memory circuit storing the digital signals obtained by the A/D conversion, a single digital filter equalizing for each track the waveform of the digital signals stored in the memory circuit, and a signal processor circuit demodulating the PCM signals on the basis of the digital signals processed by the digital filter.
摘要翻译： 一种用于再现以分布式关系记录在多个磁道上的PCM信号的多轨PCM再现装置，包括顺序地选择从各个磁道再现的PCM信号的信号选择器电路，A / D转换器转换由信号选择器选择的再现信号 电路转换为数字信号，存储电路，存储通过A / D转换获得的数字信号，对于每个轨道平均存储在存储器电路中的数字信号的波形的单个数字滤波器以及解调PCM信号的信号处理器电路 数字滤波器处理的数字信号的基础。
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公开(公告)号：US4660200A
公开(公告)日：1987-04-21
申请号：US784593
申请日：1985-10-04
申请人： Hiroo Okamoto , Masaharu Kobayashi
发明人： Hiroo Okamoto , Masaharu Kobayashi
CPC分类号： G11B20/1876 , G11B20/10527 , G11B20/1809
摘要： Method and apparatus for reproducing a PCM signal are disclosed. The PCM signal comprises a plurality of word-interleaved frames. Each frame comprises a plurality of data blocks and a parity block. Each data block comprises a plurality of words, each word comprises an upper symbol and a lower symbol arranged symbol by symbol. A plurality of upper symbols included in different blocks and a plurality of lower symbols included in the same word form a parity code generated from the symbols in the respective symbol sequences and a plurality of error detection/correction blocks. In the error flag processing of the PCM signal, the input PCM signal is reproduced, errors are detected and corrected based on the corresponding parity codes for a plurality of upper symbol error detection/correction sequences and a plurality of lower symbol error detection/correction sequences, error flags indicating the number of errors detected and the number of errors corrected are generated for the error detection/correction sequences based on the result of the error detection/correction, a flag indicating a maximum significant value is detected from two flags generated for the upper and lower symbol error detection/correction sequence of the same word and selecting that flag as a common flag to both sequences.
摘要翻译： 公开了用于再现PCM信号的方法和装置。 PCM信号包括多个字交错帧。 每个帧包括多个数据块和奇偶校验块。 每个数据块包括多个单词，每个单词包括按符号排列的上部符号和下部符号。 包括在不同块中的多个上符号和包含在相同字中的多个下符号形成从各符号序列中的符号生成的奇偶校验码和多个错误检测/校正块。 在PCM信号的错误标志处理中，再现输入的PCM信号，根据多个高符号错误检测/校正序列和多个较低符号错误检测/校正序列的相应奇偶校验码来检测和校正错误 基于错误检测/校正的结果，针对错误检测/校正序列产生指示检测到的错误数量和校正错误数的错误标志，从针对所述错误检测/校正生成的两个标志中检测到指示最大有效值的标志 相同字的上下符号错误检测/校正序列，并选择该标志作为两个序列的公共标志。
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3.发明授权Rotary head type digital signal recording and/or reproducing apparatus for recording and/or reproducing with a variable speed 失效用于以可变速度记录和/或再现的旋转头型数字信号记录和/或再现装置
公开(公告)号：US4905104A
公开(公告)日：1990-02-27
申请号：US76604
申请日：1987-07-22
CPC分类号： G11B20/10527 , G11B15/125 , G11B15/1875 , G11B27/005 , G11B15/4673 , G11B2220/90 , G11B2220/913
摘要： A rotary head type digital signal recording and/or reproducing apparatus wherein for 1/2 speed recording and/or reproducing from a magnetic tape, a tape feed speed is decreased to 1/2 times the normal speed, and a recording/reproducing interval becomes 2 times that of the normal mode of operation utilizing at least two rotary heads mounted at adjacent positions on a rotating cylinder with one of the rotary heads having a plus azimuth angle and the other having a minus azimuth angle. For 2 times speed recording/reproducing, a tape feed speed increases to 2 times the normal speed, and a recording/reproducing interval becomes 1/2 that of the normal mode of operation utilizing at least two rotary heads mounted on a rotating cylinder at opposite positions of a rotary axis of the cylinder, with one of the two rotary heads having a plus azimuth angle and the other having a minus azimuth angle.
摘要翻译： 一种旋转磁头式数字信号记录和/或再现装置，其中对于从磁带进行1/2速度记录和/或再现，磁带进给速度降低到正常速度的1/2倍，并且记录/再现间隔变为 使用安装在旋转圆筒上的相邻位置的至少两个旋转头的正常操作模式的2倍，其中一个旋转头具有正方位角，而另一个具有负方位角。 对于2倍速度记录/再现，磁带进给速度增加到正常速度的2倍，并且记录/再现间隔变为使用安装在相反的旋转圆柱体上的至少两个旋转磁头的正常操作模式的记录/再现间隔的1/2 两个旋转头中的一个具有正方位角，另一个具有负方位角。
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4.发明授权PCM signal recording and reproducing apparatus including simultaneous error detection/correction 失效PCM信号记录和再现装置，包括同时的错误检测/校正
公开(公告)号：US4758902A
公开(公告)日：1988-07-19
申请号：US886235
申请日：1986-07-16
CPC分类号： G11B20/1809 , G11B20/10527 , G11B5/86
摘要： A PCM signal recording and reproducing apparatus comprises first and second memory circuits, in which PCM signals are read and written using the first memory circuit, while PCM signals stored in the second memory circuit are error-corrected. At the end of writing by the first memory circuit, the first and second memory circuits are interchanged to read the error-corrected PCM signals stored in the second memory circuit. The read-out error-corrected PCM signals are then recorded on another magnetic tape.
摘要翻译： PCM信号记录和再现装置包括第一和第二存储器电路，其中使用第一存储器电路读取和写入PCM信号，而存储在第二存储器电路中的PCM信号被纠错。 在由第一存储器电路写入结束时，互换第一和第二存储器电路以读取存储在第二存储器电路中的经纠错的PCM信号。 然后将读出错误校正的PCM信号记录在另一个磁带上。
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公开(公告)号：US4677622A
公开(公告)日：1987-06-30
申请号：US622711
申请日：1984-06-20
申请人： Hiroo Okamoto , Masaharu Kobayashi , Keizo Nishimura , Takaharu Noguchi , Takao Arai , Toshifumi Shibuya
发明人： Hiroo Okamoto , Masaharu Kobayashi , Keizo Nishimura , Takaharu Noguchi , Takao Arai , Toshifumi Shibuya
CPC分类号： G11B20/1809
摘要： This invention relates to an error correction upon reproduction of digital signals. The error correction is performed by decoding code words such as cross-interleaved Reed Solomon codes, in which first code blocks are formed by a plurality of information words which are in the first arrangement state and a plurality of first check words which are produced by codes associated with the plurality of information words with a Hamming distance of d.sub.1, and second code blocks are formed by a plurality of information words and a plurality of first check words which are in the second arrangement state and which consist of the said plurality of information words and the said plurality of first check words which are respectively included in the different first code blocks, and by a plurality of second check words which are produced by codes associated with the plurality of information words and the plurality of first check words with a Hamming distance of d.sub.2. At the first decoding stage, errors are detected and at the same time the flags indicative of the decoding states are added with respect to the second code blocks. At the second decoding stage, in accordance with the contents of the flags and on the basis of a combination of p.sub.2 and q selected from their combinations satisfying 2p.sub.2 +q.ltoreq.d.sub.1 -1, errors are detected and errors of p.sub.2 words are corrected and erasures of q words to which the flags were added are corrected with respect to the first code blocks.
摘要翻译： 本发明涉及数字信号再现时的纠错。 通过解码诸如交叉交织的里德·所罗门码的码字来执行纠错，其中第一码块由处于第一布置状态的多个信息字形成，并且由代码产生的多个第一检查字 与具有汉明距离d1的多个信息字相关联，第二码块由处于第二布置状态的多个信息字和多个第一检查词形成，并且由所述多个信息字组成 以及分别包含在不同的第一代码块中的所述多个第一校验字以及由与多个信息字相关联的代码产生的多个第二校验字和具有汉明距离的多个第一校验字 的d2。 在第一解码阶段，检测到错误，并且同时相对于第二代码块添加指示解码状态的标志。 在第二解码阶段，根据标志的内容，并且基于从满足2p2 + q·d1-1的组合中选择的p2和q的组合，检测出错误并校正p2个字的错误 并且相对于第一代码块校正添加了标志的q个字的擦除。
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6.发明授权Rotary-head type PCM data recording/reproducing method and apparatus with a redundancy-reduced control data format 失效旋转头型PCM数据记录/再现方法和具有冗余减少的控制数据格式的装置
公开(公告)号：US4622600A
公开(公告)日：1986-11-11
申请号：US685551
申请日：1984-12-24
CPC分类号： G11B20/1208 , G11B20/10527 , G11B20/1803 , G11B20/1813 , G11B27/3027 , G11B27/3063 , G11B20/1211 , G11B2020/10546 , G11B2020/10592 , G11B2220/90 , G11B2220/913
摘要： A rotary-head PCM data recorder in which PCM signals of m in number, a synchronizing signal, control signals related to the PCM signals, and a parity signal for error detection and correction are formed into data blocks, and data blocks of n in number are recorded on one track of a magnetic tape. Among the control signals, bits of signals common to n data blocks (i.e., information needed once for each track) are formed in distributed data allocated in a group of consecutive blocks or tracks, and multiple block distributive control data are recorded on one track multiple number of times, or multiple track distributive control data are recorded along n block strings a multiple number of times. In reproduction, block or track distributive data are composed to reproduce the control signals. The recorder thus arranged reduces the bit number needed for the control signals and compensates dropout of reproduced data due to scratches on the tape and the like.
摘要翻译： 旋转磁头PCM数据记录器，其中m个数字的PCM信号，同步信号，与PCM信号相关的控制信号，以及用于错误检测和校正的奇偶校验信号形成数据块，数字数据n 记录在磁带的一个轨道上。 在控制信号中，分配在一组连续块或轨道中的分布式数据中形成n个数据块共同的信号位（即，对于每个磁道一次需要的信息），并且多个块分布控制数据被记录在一个磁道多个 次数或多个磁道分布控制数据沿着n个块串被多次记录。 在再现中，构成块或轨道分布数据以再现控制信号。 如此布置的记录器减少了控制信号所需的位数，并补偿了由于磁带等上的划痕而导致的再现数据的丢失。
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公开(公告)号：US4704640A
公开(公告)日：1987-11-03
申请号：US787447
申请日：1985-10-15
申请人： Hiroo Okamoto , Masaharu Kobayashi
发明人： Hiroo Okamoto , Masaharu Kobayashi
IPC分类号： G11B20/12 , G11B5/00 , G11B5/008 , G11B20/08 , G11B20/10 , G11B20/14 , G11B20/18 , G11B5/09 , H03M13/00
CPC分类号： G11B5/0086 , G11B20/10527 , G11B20/1426 , G11B20/1809
摘要： In PCM signal recording method and apparatus using rotary heads for converting two channels of autio PCM signals each consisting of 12-bit words to a data consisting of 8-bit words and recording the converted data, there is provided means for converting the PCM signals to two data each consisting of eight high order bits of each of two words of the PCM signals, and an 8-bit data consisting of the remaining four low order bits of the respective words. The converted PCM data are recorded on a record tape in a format such that PCM signals having i words/channel which are to be recorded on first and second tracks are divided into a first half and a second half, even data in the first half and odd data in the second half constitute the data to be recorded on the first track, and odd data in the first half and even data in the second half constitute the data to be recorded on the second track.
摘要翻译： 在使用旋转磁头的PCM信号记录方法和装置中，用于将由12位字组成的两个通道的PCM信号转换为由8位字组成的数据并记录转换的数据，提供了将PCM信号转换为 每个由PCM信号的两个字中的每一个的8个高位构成的两个数据以及由各个字的剩余4个低位组成的8位数据。 经转换的PCM数据以记录在第一和第二磁道上的具有i个字/频道的PCM信号被划分为前半部分和第二半部分的偶数数据的格式被记录在记录磁带上，并且 第二半帧中的奇数数据构成要记录在第一磁道上的数据，上半部分的奇数数据和后半部分的偶数数据构成要记录在第二磁道上的数据。
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8.发明授权
公开(公告)号：US4646301A
公开(公告)日：1987-02-24
申请号：US665378
申请日：1984-10-26
CPC分类号： G11B20/1809 , G06F11/10 , H03M13/29
摘要： Error correction of digital signals is suited for codes having error detection and correction words, such as doubly-encoded Reed-Solomon code. In a first decoding, at least error detection is effected and flags indicating decoding conditions are added. In a second decoding, error detection for first code blocks and error correction for S2 words at unknown locations and E flagged word erasures, where d1 is a Hamming distance and S2 and E satisfy a relation of 2S2+E.ltoreq.d1-1, are parallely or sequentially effected, and a combination of S2 and E having a high correction capability and a low probability of miscorrection is selected from a plurality of correction results of error locations and the numbers of flags added at the first decoding, and the word errors are corrected based on the selected combination.
摘要翻译： 数字信号的纠错适用于具有错误检测和纠错字的代码，例如双重编码的里德 - 所罗门码。 在第一解码中，至少进行错误检测，并且添加指示解码条件的标志。 在第二解码中，用于第一代码块的错误检测和未知位置处的S2字的错误检测和E标记的字擦除，其中d1是汉明距离，S2和E满足2S2 + E 的关系， 平行或顺序地实现，并且从错误位置的多个校正结果和在第一次解码时添加的标志数量，选择具有高校正能力和低错误概率的S2和E的组合，并且单词错误 根据所选择的组合进行校正。
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9.发明授权Method and apparatus for recording and reproducing a digital signal with a stationary head 失效用固定头记录和再现数字信号的方法和装置
公开(公告)号：US4646170A
公开(公告)日：1987-02-24
申请号：US757448
申请日：1985-07-22
申请人： Masaharu Kobayashi , Hiroo Okamoto , Takao Arai
发明人： Masaharu Kobayashi , Hiroo Okamoto , Takao Arai
CPC分类号： G11B20/1809
摘要： In a stationary head type PCM recorder having an A/D converter for sampling an analog signal and converting the analog signal to a digital signal, a signal processing circuit including data delay means for adding an error detection and correction code and a predetermined signal to the digital signal for each error correction group of a predetermined number of samples, and a multi-track head for recording an output of the signal processing circuit on a plurality of tracks of a magnetic record medium and reproducing the signals recorded on the magnetic record medium; incorrectability of the error detection and correction code for a burst error in the output analog signal due to a burst error in the reproduced output is reduced by delaying parity data by the error detection and correction code and the digital signal data by different delay times such that the digital signal data are dispersely recorded in a track direction and a tape transport direction, and allotting the delayed data to the multi-track head such that the data of the adjacent sample points are spaced from each other by at least the distribution length of the parity data and the parity data is arranged between the distributed adjacent data.
摘要翻译： 在具有用于对模拟信号进行采样并将模拟信号转换为数字信号的A / D转换器的静态磁头型PCM记录器中，包括数据延迟装置的信号处理电路，用于将误差检测和校正码以及预定信号加到 数字信号，以及用于在磁记录介质的多个轨道上记录信号处理电路的输出并再现记录在磁记录介质上的信号的多轨头; 由于错误检测和校正码以及数字信号数据通过不同的延迟时间来延迟奇偶校验数据，所以减少了由于再现输出中的脉冲串错误导致的输出模拟信号中的脉冲串错误的错误检测和校正码的不正确性， 数字信号数据被分散地记录在轨道方向和磁带传输方向上，并且将延迟的数据分配给多磁道磁头，使得相邻采样点的数据彼此间隔至少为 奇偶校验数据和奇偶校验数据被布置在分布的相邻数据之间。
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10.发明授权
公开(公告)号：US4649542A
公开(公告)日：1987-03-10
申请号：US621743
申请日：1984-06-18
申请人： Keizo Nishimura , Masaharu Kobayashi , Hiroo Okamoto , Takaharu Noguchi , Takao Arai , Toshifumi Shibuya
发明人： Keizo Nishimura , Masaharu Kobayashi , Hiroo Okamoto , Takaharu Noguchi , Takao Arai , Toshifumi Shibuya
CPC分类号： G11B20/1809
摘要： A method of transmitting a digital signal in the form of successive signal frames containing codes for detecting and correcting errors of the digital signal for reducing degradation in the quality of the reproduced sound due to generation of the code errors in a digitized audio signal transmission system. An analog signal such as an audio signal is sampled and subjected to A/D conversion. The sample word thus obtained is divided into a plurality of symbol elements. Parity words for detecting and correcting code errors are added to every group of a predetermined number of the information symbols through an interleave procedure before being transmitted. The method includes the steps of applying a first frame of symbols, taken one from each input channel, and having a first arrangement state, to a first error-correcting code encoder to generate a series of first parity words; delaying each of the symbols in the first frame and each of the first parity words by a respective different delay time in a unit of the sample word at a delay line to provide a resulting second frame of symbols in a second arrangement state; applying the second frame of symbols to a second error-correcting code encoder to generate a series of second parity words; and transmitting said second frame of symbols together with said second parity words.
摘要翻译： 以包含用于检测和校正数字信号的错误的代码的连续信号帧的形式发送数字信号的方法，用于减少由于数字化音频信号传输系统中的代码错误的产生而导致的再现声音质量的劣化。 诸如音频信号的模拟信号被采样并进行A / D转换。 由此获得的采样字被分成多个符号元素。 用于检测和校正码错误的奇偶校验字在发送之前通过交织过程被添加到预定数量的信息符号的每个组中。 该方法包括以下步骤：将第一帧符号从每个输入通道中取出并具有第一布置状态到第一纠错码编码器以产生一系列第一奇偶校验字; 延迟第一帧和第一奇偶校验字中的每个符号以延迟线为单位的采样字的相应的不同延迟时间，以在第二布置状态下提供所得到的第二符号帧; 将第二符号帧应用于第二纠错码编码器以产生一系列第二奇偶校验字; 以及与所述第二奇偶校验字一起发送所述第二符号帧。
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