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    Method of correcting errors of digital signals in the recording and reproduction of digital signals
    2.
    发明授权
    Method of correcting errors of digital signals in the recording and reproduction of digital signals 失效
    在数字信号的记录和再现中校正数字信号的误差的方法

    公开(公告)号：US4661956A

    公开(公告)日：1987-04-28

    申请号：US703917

    申请日：1985-02-21

    申请人： Morishi Izumita ,  Seiichi Mita ,  Masuo Umemoto ,  Hidehiro Kanada ,  Morito Rokuda

    发明人： Morishi Izumita ,  Seiichi Mita ,  Masuo Umemoto ,  Hidehiro Kanada ,  Morito Rokuda

    IPC分类号： G06F15/16 ,  G06F11/10 ,  G06F12/00 ,  G06F15/177 ,  G11B20/18

    CPC分类号： G06F11/1076 ,  G06F11/1008 ,  G11B20/1833

    摘要： Parity bits (check bits) having a relatively high redundancy are added to upper significant bits of a digital signal, and parity bits having a relatively low redundancy, are added to the lower significant bits of the digital signal. The signal and the parity bits are recorded on a recording medium. The position of an error in a data block group of the lower bits reproduced from the recording medium is estimated as existing in a block in which the error is detected by the check of the data block group of the upper bits, and in the blocks preceding and subsequent to the former.This error correction method is most suitable for a recording and reproduction system of digital video signals.

    摘要翻译： 具有较高冗余度的奇偶校验位（校验位）被添加到数字信号的高有效位，并且具有较低冗余度的奇偶校验位被添加到数字信号的较低有效位。 信号和奇偶校验位被记录在记录介质上。 从记录介质再现的低位的数据块组中的误差的位置被估计为存在于通过对高位的数据块组的检查检测出错误的块中，以及在前一个块 并在之前。 该纠错方法最适用于数字视频信号的记录和再现系统。

    Code modulation system
    3.
    发明授权
    Code modulation system 失效
    码调制系统

    公开(公告)号：US4628297A

    公开(公告)日：1986-12-09

    申请号：US696477

    申请日：1985-01-30

    申请人： Seiichi Mita ,  Morishi Izumita ,  Masuo Umemoto ,  Yoshizumi Eto ,  Morito Rokuda ,  Hidehiro Kanada

    发明人： Seiichi Mita ,  Morishi Izumita ,  Masuo Umemoto ,  Yoshizumi Eto ,  Morito Rokuda ,  Hidehiro Kanada

    IPC分类号： H04L25/49 ,  G11B20/14 ,  H04N5/91 ,  H04N5/92 ,  H03K13/24 ,  G11B5/09

    CPC分类号： G11B20/1426

    摘要： In the code modulation system for converting input data levels into an output signal in the form of code words by providing M input levels among N input levels assigned to input data with stairlike code weights on the basis of the input levels, (N-M) input levels which are the difference between said N input levels and said M input levels are respectively disposed near transition points where said stairlike code weight is changed, and the code weights are provided with hysteresis in the ascent process and the descent process of the input data level.

    摘要翻译： 在用于将输入数据电平转换为码字形式的输出信号的码调制系统中，通过在分配给输入数据的N个输入电平之间提供基于输入电平的阶梯式码权重的M个输入电平，（NM）输入电平 所述N个输入电平和所述M个输入电平之间的差别分别设置在所述阶梯式码权重改变的过渡点附近，并且在上升处理中的代码权重和输入数据电平的下降处理被赋予滞后。

    Method for decoding double-encoding codes and apparatus using the same
    5.
    发明授权
    Method for decoding double-encoding codes and apparatus using the same 失效
    用于对双重编码码进行解码的方法及使用其的装置

    公开(公告)号：US4653052A

    公开(公告)日：1987-03-24

    申请号：US750513

    申请日：1985-07-01

    申请人： Nobukazu Doi ,  Morishi Izumita ,  Seiichi Mita ,  Yoshizumi Eto ,  Morito Rokuda

    发明人： Nobukazu Doi ,  Morishi Izumita ,  Seiichi Mita ,  Yoshizumi Eto ,  Morito Rokuda

    IPC分类号： G06F11/10 ,  H03M13/27 ,  H03M13/29

    CPC分类号： H03M13/29

    摘要： The present invention relates to a method and an apparatus for decoding double-encoding codes in which the information to be decoded comprises a first data and a second data. The operation for decoding double-encoding codes is achieved through two stages. A decoder of the first stage checks the first data, and when an error is found in the first data, all symbols of the first data are assumed to be wrong. The first-stage decoder then adds an erasure flag to all symbols to generate erasure symbols. As a result, these erasure symbols include the symbols which are actually erroneous and those which are correct. A decoder of the second stage is used to perform an error correction on the second data. For this purpose, the second-stage decoder detects the number of erasure symbols which are contained in the second data and which are actually erroneous. If the number of actually erroneous symbols does not exceed the maximum number of correctable symbols which can be corrected by the decoder of the second stage, the error correction is effected; otherwise, the decoder detects an error without conducting the error correction.

    摘要翻译： 本发明涉及一种用于解码双重编码码的方法和装置，其中待解码的信息包括第一数据和第二数据。 双编码解码操作通过两个阶段实现。 第一级的解码器检查第一数据，并且当在第一数据中发现错误时，假定第一数据的所有符号是错误的。 然后，第一级解码器将擦除标志添加到所有符号以产生擦除符号。 结果，这些擦除符号包括实际上是错误的符号和正确的符号。 第二级的解码器用于对第二数据执行纠错。 为此，第二级解码器检测包含在第二数据中并且实际上是错误的擦除符号的数量。 如果实际错误符号的数量不超过可由第二级的解码器校正的可校正符号的最大数目，则进行纠错; 否则，解码器在不进行纠错的情况下检测到错误。

    Adaptive transform encoder for digital image signal in recording/reproducing apparatus
    6.
    发明授权
    Adaptive transform encoder for digital image signal in recording/reproducing apparatus 失效
    用于记录/再现装置中的数字图像信号的自适应变换编码器

    公开(公告)号：US5047852A

    公开(公告)日：1991-09-10

    申请号：US375727

    申请日：1989-07-05

    申请人： Hiroyuki Hanyu ,  Nobukazu Doi ,  Seiichi Mita ,  Morishi Izumita ,  Yoshizumi Eto

    发明人： Hiroyuki Hanyu ,  Nobukazu Doi ,  Seiichi Mita ,  Morishi Izumita ,  Yoshizumi Eto

    IPC分类号： G06T9/00 ,  H03M7/30 ,  H03M7/38 ,  H04N1/41 ,  H04N5/926 ,  H04N19/00 ,  H04N19/115 ,  H04N19/126 ,  H04N19/134 ,  H04N19/136 ,  H04N19/14 ,  H04N19/176 ,  H04N19/186 ,  H04N19/189 ,  H04N19/196 ,  H04N19/46 ,  H04N19/59 ,  H04N19/60 ,  H04N19/625 ,  H04N19/70 ,  H04N19/85

    CPC分类号： H04N5/9264 ,  H04N19/115 ,  H04N19/124 ,  H04N19/14 ,  H04N19/149 ,  H04N19/154 ,  H04N19/176 ,  H04N19/18 ,  H04N19/184 ,  H04N19/60 ,  H04N19/13 ,  H04N19/146 ,  H04N19/91

    摘要： An adaptive transform encoder can keep a recording rate of a digital signal at a constant level. It comprises a unit for orthogonal-transforming one block of digital input signal, a unit for calculating an activity index of the orthogonal-transformed block, a unit for comparing the activity index of the block with a predetermined reference, a unit for classifying the block to a standard bit class having a predetermined number of bits when the activity index of the block is equal to the reference, classifying the block to a low bit class having a smaller number of bits than the predetermined number of bits of the standard bit class when the activity index of the block is smaller than the reference, and classifying the block to a high bit class having a larger number of bits than the predetermined number of bits of the standard bit class when the activity index is larger than the reference, a quantization unit for quantizing the input signal of the block with the number of bits designated by the bit class, a unit for selecting the block of the low bit class from the quantized blocks, an allocation unit for adding to the selected block of the low bit class the data having more bits than the number of bits of the standard bit class of the block of the quantized high bit class, and an encoder unit for encoding the quantized block signal.

    摘要翻译： 自适应变换编码器可以将数字信号的记录速率保持在恒定水平。 它包括用于正交变换一个数字输入信号块的单元，用于计算正交变换块的活动索引的单元，用于将块的活动性指数与预定参考进行比较的单元，用于对块进行分类的单元 当块的活动索引等于参考时，将具有预定比特数的标准比特类分类为具有比标准比特类的预定比特数少的比特数比特的低比特级， 该块的活动指数小于参考值，并且当活动指数大于参考值时，将块分类为具有比标准比特类的预定比特数大的比特数的比特数较大的高比特级，量化 用于通过由位类别指定的比特数量量化块的输入信号的单元，用于从量化块中选择低比特等级的块的单元 分配单元，用于向所选择的低位类别的块添加比量化高位类别的块的标准位类别的位数多的位的数据，以及用于对量化块信号进行编码的编码器单元 。

    Signal processing method and signal processing circuit
    9.
    发明申请
    Signal processing method and signal processing circuit 有权
    信号处理方法和信号处理电路

    公开(公告)号：US20050044468A1

    公开(公告)日：2005-02-24

    申请号：US10922227

    申请日：2004-08-18

    申请人： Morishi Izumita ,  Terumi Takashi ,  Hideki Sawaguchi ,  Seiichi Mita

    发明人： Morishi Izumita ,  Terumi Takashi ,  Hideki Sawaguchi ,  Seiichi Mita

    IPC分类号： G06F11/10 ,  G11B20/10 ,  G11B20/18 ,  H03M13/11 ,  H03M13/15 ,  H03M13/27 ,  H03M13/29 ,  H03M13/45 ,  H03M13/00 ,  G11C29/00

    CPC分类号： H03M13/29 ,  G11B20/10009 ,  H03M13/1111 ,  H03M13/1191 ,  H03M13/1515 ,  H03M13/2703 ,  H03M13/3746 ,  H03M13/45 ,  H03M13/6343 ,  H03M13/6505

    摘要： In one embodiment, a symbol error correction encoder effects block interleaving on recording data and thereafter performs first error correction encoding on the recording data. Next, a symbol error correction encoder performs encoding on the whole block. A reproducing processing circuit outputs likelihood information of respective bits. A first error correction decoder corrects a random error produced upon recording and reproduction, using the likelihood information. Since it is possible to make an improvement in performance with respect to the random error by repetitive decoding at this time, the post-correction data is returned to the reproducing processing circuit. After the completion of such repetitive processing, the data is digitized and subjected to an error correction in symbol unit by a hard determination, and outputted to a symbol error correction decoder.

    摘要翻译： 在一个实施例中，符号纠错编码器在记录数据上实现块交错，并且此后对记录数据执行第一纠错编码。 接下来，符号纠错编码器对整个块执行编码。 再现处理电路输出各位的似然信息。 第一纠错解码器使用似然信息校正记录和再现时产生的随机误差。 由于此时可以通过重复解码对随机误差进行性能改善，所以后校正数据返回到再生处理电路。 在完成这样的重复处理之后，数据被数字化，并通过硬判断进行符号单位的纠错，并将其输出到符号纠错解码器。

    Tape recorder with means for sampling and holding focusing and tracking error signals during discontinuity of tape on surface of rotating drum
    10.
    发明授权
    Tape recorder with means for sampling and holding focusing and tracking error signals during discontinuity of tape on surface of rotating drum 失效
    磁带录音机，用于在旋转鼓表面上的磁带不连续时采样和保持对焦和跟踪误差信号

    公开(公告)号：US5090005A

    公开(公告)日：1992-02-18

    申请号：US428937

    申请日：1989-10-30

    申请人： Fumio Hara ,  Seiichi Mita ,  Morishi Izumita ,  Hiroyuki Tsuchinaga

    发明人： Fumio Hara ,  Seiichi Mita ,  Morishi Izumita ,  Hiroyuki Tsuchinaga

    IPC分类号： G11B7/00 ,  G11B7/003 ,  G11B7/0055 ,  G11B7/09

    CPC分类号： G11B7/09 ,  G11B7/0031

    摘要： A tape recorder of the present invention comprises a pair of feed and take-up spools for winding a tape as recording media, a rotatable drum rotated to wind and run the tape between the pair of spools over the drum surface helically, a head for recording, reproducing or erasing signals on the tape wound over said drum surface, and control means for controlling the relative positional relationship between the head and the tape wound over the drum surface based on an error signal such that said signals are stably recorded, reproduced or erased along a desired track, the control means having means for holding the error signal during the period in which the tape is discontinued over a drum surface. The value of the error signal at the time immediately before the tape disappears from the drum surface, or the value of the error signal at the time immediately after the tape reappears over the drum surface during the preceding rotation of the drum is used as the error signal to be held, thereby allowing to stably restart the positioning control when the tape reappears over the drum surface.

    摘要翻译： 本发明的磁带录音机包括一对用于卷绕磁带作为记录介质的进给卷轴和卷取卷轴，旋转的滚筒旋转以在螺旋状的卷筒表面上的一对卷轴之间卷绕和运行磁带，用于记录的磁头 ，再现或擦除在所述鼓表面上缠绕的磁带上的信号;以及控制装置，用于基于误差信号控制磁头和缠绕在磁鼓表面上的磁带之间的相对位置关系，使得所述信号被稳定地记录，再现或擦除 所述控制装置具有用于在所述磁带在鼓表面上停止的时段期间保持所述误差信号的装置。 在磁带从磁鼓表面消失之前的时刻的误差信号的值，或在磁带的前一个旋转期间磁带重新出现在磁鼓表面之后的时刻的误差信号的值被用作误差 信号被保持，从而当带重新出现在滚筒表面上时，允许稳定地重新启动定位控制。