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151 条记录 (耗时 0.03 秒)

    Error correction method and system
    1.
    发明授权
    Error correction method and system 失效
    纠错方法和系统

    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

    IPC分类号： G11B20/18 ,  G06F11/10

    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。

    Digital signal transmission method providing high error correction capability
    2.
    发明授权
    Digital signal transmission method providing high error correction capability 失效
    数字信号传输方式提供高纠错能力

    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

    IPC分类号： G11B20/18 ,  H03M13/00 ,  H03M13/27 ,  G06F11/10

    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。

    PCM signal recording/reproducing apparatus
    9.
    发明授权
    PCM signal recording/reproducing apparatus 失效
    PCM信号记录/再现装置

    公开(公告)号：US4617599A

    公开(公告)日：1986-10-14

    申请号：US620893

    申请日：1984-06-15

    申请人： Takaharu Noguchi ,  Masaharu Kobayashi ,  Takao Arai ,  Toshifumi Shibuya

    发明人： Takaharu Noguchi ,  Masaharu Kobayashi ,  Takao Arai ,  Toshifumi Shibuya

    IPC分类号： G11B5/008 ,  G11B5/035 ,  G11B5/09 ,  G11B15/467 ,  G11B20/10 ,  G11B20/18 ,  G11B5/00

    CPC分类号： G11B5/09 ,  G11B15/4671 ,  G11B20/10527 ,  G11B20/1809 ,  G11B5/00878 ,  G11B5/035

    摘要： A digital signal recording/reproducing apparatus capable of recording and reproducing digital signals having differences in respect to sampling frequency thereof and the number of quantization bits per sample by means of a common circuit arrangement includes means for varying revolution speed of rotating heads for recording and reproduction or traveling speed of a recording medium as a function of different sampling frequencies. A signal processing circuit for processing the digital signals so as to be suited for the recording on the recording medium is controlled by a clock signal of which frequency is changed in dependence on the different sampling frequencies. The signal processing circuit is arranged so that PCM data contained in a frame is constituted by a number of bits which is equal to a common multiple of the different quantization bit numbers and added with a common frame synchronizing signal and common error detection and correction codes to thereby prepare the PCM signal of the frame arrangement. The digital signals which differ in the sampling frequency and the quantization bit numbers can be recorded by same recording and reproducing apparatus with an improved efficiency with a same wavelength and in a same signal format.

    摘要翻译： 一种数字信号记录/再现装置，其能够记录和再现与其采样频率有差异的数字信号和通过公共电路装置的每个样本的量化位数，包括用于改变用于记录和再现的旋转磁头的转速的装置 或作为不同采样频率的函数的记录介质的行进速度。 用于处理适于在记录介质上进行记录的数字信号的信号处理电路由频率根据不同采样频率而变化的时钟信号控制。 信号处理电路被布置成使得包含在帧中的PCM数据由等于不同量化比特数的公倍数的比特数构成，并且加上公共帧同步信号和公共错误检测和校正码 从而准备帧配置的PCM信号。 采样频率和量化比特数不同的数字信号可以由相同的记录和再现装置以相同的波长和相同的信号格式提高效率来记录。

    Rotary head type PCM recording and reproduction method and system
    10.
    发明授权
    Rotary head type PCM recording and reproduction method and system 失效
    旋转头式PCM记录和再现方法和系统

    公开(公告)号：US4685004A

    公开(公告)日：1987-08-04

    申请号：US712094

    申请日：1985-03-15

    申请人： Hiroaki Takahashi ,  Masaharu Kobayashi ,  Takaharu Noguchi ,  Toshifumi Shibuya ,  Takao Arai

    发明人： Hiroaki Takahashi ,  Masaharu Kobayashi ,  Takaharu Noguchi ,  Toshifumi Shibuya ,  Takao Arai

    IPC分类号： G11B5/09 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B5/00

    CPC分类号： G11B20/1809 ,  G11B20/10527

    摘要： In a recording operation by a rotary head type PCM recording/reproducing apparatus including at least two magnetic heads, the odd-numbered sample data and the even-numbered sample data are discriminatively extracted and stored. The stored data corresponding to an amount of data outputted from the A/D converter within a predetermined time is selectively read out and supplied to the two heads to thereby record the data in such a manner that the odd-numbered data and the even-numbered data are recorded separately on a track basis or alternatively recorded separately on a preceding half and a succeeding half of each track. The error detecting and correcting code is prepared on the basis of the data to be recorded in each track. In reproduction of the recorded data, upon detection of a drop-out of the data from one of the two heads, the drop-out data is corrected through interpolation procedure to thereby reconstitute the original analog signal.

    摘要翻译： 在通过包括至少两个磁头的旋转磁头型PCM记录/再现装置的记录操作中，奇数样本数据和偶数样本数据被辨别地提取和存储。 对应于在预定时间内从A / D转换器输出的数据量的存储数据被选择性地读出并提供给两个磁头，从而以奇数数据和偶数编号的方式记录数据 数据在轨道基础上单独记录，或者分别记录在每个轨道的前半部分和后半部分。 基于要记录在每个轨道中的数据来准备错误检测和校正码。 在记录数据的再现中，在检测到来自两个头之一的数据丢失时，通过插值程序来校正丢失数据，从而重构原始模拟信号。