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72 条记录 (耗时 0.038 秒)

    Method and apparatus for magnetic recording and reproduction of digital signal
    32.
    发明授权
    Method and apparatus for magnetic recording and reproduction of digital signal 失效
    用于磁记录和再现数字信号的方法和装置

    公开(公告)号：US4367495A

    公开(公告)日：1983-01-04

    申请号：US197572

    申请日：1980-10-16

    申请人： Seiichi Mita ,  Yasuhiro Hirano ,  Yoshizumi Eto

    发明人： Seiichi Mita ,  Yasuhiro Hirano ,  Yoshizumi Eto

    IPC分类号： G11B5/09 ,  G11B20/10 ,  H04L25/497 ,  H04N5/92

    CPC分类号： G11B20/10194 ,  G11B20/10055 ,  H04L25/497

    摘要： Magnetic recording and reproducing method and apparatus for digital signals. An input binary digital signal is converted into an intermediate signal series by a precoder having a delay circuit for two-time slot delay and a modulo-2 adder. The intermediate signal series is branched to two paths. One signal on one path is delayed by one time slot and subtracted from the other signal on the other path to produce a recording signal to be recorded on a recording medium. A signal reproduced from the recording medium is branched to two paths. One signal on one path is delayed by one time slot and added to the other signal on the other path. The added signal is decoded to produce a binary signal which corresponds to the input binary digital signal.

    摘要翻译： 用于数字信号的磁记录和再现方法和装置。 输入二进制数字信号由具有用于两时隙延迟的延迟电路和模2加法器的预编码器转换成中间信号序列。 中间信号序列分支到两个路径。 一个路径上的一个信号被延迟一个时隙，并从另一个路径上的另一个信号中减去，以产生记录在记录介质上的记录信号。 从记录介质再现的信号被分支到两条路径。 一个路径上的一个信号被延迟一个时隙，并添加到另一个路径上的另一个信号。 所附加的信号被解码以产生对应于输入二进制数字信号的二进制信号。

    Reproduced signal processing method, reproduced signal processing circuit, and a magnetic storage apparatus
    35.
    发明授权
    Reproduced signal processing method, reproduced signal processing circuit, and a magnetic storage apparatus 有权
    再现信号处理方法，再现信号处理电路和磁存储装置

    公开(公告)号：US6104331A

    公开(公告)日：2000-08-15

    申请号：US161734

    申请日：1998-09-29

    申请人： Yoshiteru Ishida ,  Naoki Satoh ,  Terumi Takashi ,  Akihiko Hirano ,  Seiichi Mita

    发明人： Yoshiteru Ishida ,  Naoki Satoh ,  Terumi Takashi ,  Akihiko Hirano ,  Seiichi Mita

    IPC分类号： G11B5/09 ,  G11B5/012 ,  G11B19/04 ,  G11B20/10 ,  G11B20/24 ,  G11B23/00 ,  H03M1/12 ,  G11B5/02

    CPC分类号： G11B19/04 ,  G11B20/10009 ,  G11B20/24 ,  G11B5/012 ,  G11B23/0007 ,  G11B5/09

    摘要： A reproduced signal processing circuit includes a variable gain amplifier to which a signal read from a medium by a reproducing head is inputted; an analog-to-digital converter for converting a signal outputted from the variable gain amplifier into a digital signal; and a variable frequency oscillator for supplying an operation clock signal to the analog-to-digital converter. A reproduced signal processing method includes the steps of operating a first control loop for controlling the variable gain amplifier; operating at least either one of a second control loop and a third control loop, the second control loop controlling the variable frequency oscillator, the third control loop controlling the variable frequency oscillator; filtering by analog filter means the read signal inputted to the variable gain amplifier; operating at least one of first, second, and third noise detecting operations, the first noise detecting operation detecting presence or absence of a noise by comparing an amplitude of the output signal from the variable gain amplifier with a predetermined threshold value, the second noise detecting operation detecting a noise during an operation period of the second control loop, the third noise detecting operation detecting a noise during an operation period of the third control loop; and changing the range of cutoff frequency of the analog filter means in accordance with a result from at least one of the first, second, and third noise detecting operations, thereby controlling at least one of the first, second, and third control loops.

    摘要翻译： 再现信号处理电路包括可变增益放大器，从再现头从介质读取的信号被输入到该可变增益放大器; 用于将从可变增益放大器输出的信号转换为数字信号的模拟 - 数字转换器; 以及用于向模数转换器提供操作时钟信号的可变频率振荡器。 再现信号处理方法包括以下步骤：操作用于控制可变增益放大器的第一控制环路; 操作第二控制回路和第三控制回路中的至少一个，控制可变频率振荡器的第二控制回路，控制可变频率振荡器的第三控制回路; 通过模拟滤波器滤波意味着输入到可变增益放大器的读取信号; 操作第一，第二和第三噪声检测操作中的至少一个，所述第一噪声检测操作通过将来自可变增益放大器的输出信号的幅度与预定阈值进行比较来检测噪声的存在或不存在，第二噪声检测 操作在第二控制回路的操作期间检测噪声，第三噪声检测操作在第三控制回路的操作期间检测噪声; 以及根据第一，第二和第三噪声检测操作中的至少一个的结果改变模拟滤波器装置的截止频率的范围，从而控制第一，第二和第三控制回路中的至少一个。

    Recording method using trial write test pattern
    37.
    发明授权
    Recording method using trial write test pattern 失效
    录音方式采用试写式测试模式

    公开(公告)号：US5732061A

    公开(公告)日：1998-03-24

    申请号：US731243

    申请日：1996-10-11

    申请人： Fumiyoshi Kirino ,  Takeshi Maeda ,  Hiroshi Ide ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu ,  Tsuyoshi Toda

    发明人： Fumiyoshi Kirino ,  Takeshi Maeda ,  Hiroshi Ide ,  Toshimitsu Kaku ,  Seiichi Mita ,  Kazuo Shigematsu ,  Tsuyoshi Toda

    IPC分类号： G11B7/0045 ,  G11B7/013 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B7/00

    CPC分类号： G11B7/126 ,  G11B11/1053 ,  G11B11/10595 ,  G11B20/10009 ,  G11B20/10212 ,  G11B20/1816 ,  G11B7/0045 ,  G11B7/1267 ,  G11B11/10506 ,  G11B11/10508 ,  G11B20/1258 ,  G11B7/24085

    摘要： In a write control method on an optical recording, at least one shift amount selected from the defocus amount of a laser beam on a recording medium, the shift amount of a recording position on a recording track and the shift amount of laser power during recording is controlled such that the selected amount falls within a predetermined range. Subsequently, a trial signal is trially recorded at a plurality of trial zones on the recording medium by using a laser power value as a parameter. The recorded trial signal is read and a difference .DELTA.V between center levels of a highest density waveform and a lowest density waveform is detected. In connection with each trial zone, the laser power value when a reading trial signal which makes the difference .DELTA.V minimum is recorded is defined as an optimum recording power value. Regular data is recorded at a predetermined storage area on the recording medium by using an optimum laser power value determined in connection with a trial zone closest to the predetermined storage area.

    摘要翻译： 在光学记录中的写入控制方法中，从记录介质上的激光束的散焦量，记录轨道上的记录位置的偏移量和记录期间的激光功率的移动量选择的至少一个偏移量是 被控制使得所选择的量落在预定范围内。 随后，通过使用激光功率值作为参数，在记录介质上的多个试验区上试用信号。 读取记录的试验信号，并检测最高密度波形的中心水平和最低密度波形之间的差ΔTA。 结合每个试验区域，当记录使DELTA V最小值的读取试验信号被记录时的激光功率值被定义为最佳记录功率值。 通过使用与最接近预定存储区域的试验区域确定的最佳激光功率值，将正常数据记录在记录介质上的预定存储区域。

    Receiver for data transmission system with nonlinearities
    39.
    发明授权
    Receiver for data transmission system with nonlinearities 失效
    具有非线性数据传输系统的接收器

    公开(公告)号：US5131011A

    公开(公告)日：1992-07-14

    申请号：US545308

    申请日：1990-06-26

    申请人： Johannes W. M. Bergmans ,  Seiichi Mita ,  Morishi Izumita

    发明人： Johannes W. M. Bergmans ,  Seiichi Mita ,  Morishi Izumita

    IPC分类号： G11B20/18 ,  H04L1/20 ,  H04L25/03 ,  H04L25/08

    CPC分类号： H04L25/03337

    摘要： Non-linear intersymbol interference and noise in a received data signal are corrected through use of a Viterbi detector which estimates the most likely sequence of transmitted data symbols by keeping track of candidate data sequence that are recursively updated, based on likelihood measures which are determined by a signal processor which includes circuits for estimating hypothesized channel outputs in the absence of noise. Non-linear input-output relations are stored in one or more look-up tables which, in a preferred embodiment, are registers that store hypothesized channel output symbols in the absence of noise. The contents of the look-up tables may be modified in response to an error signal representative of the difference of the channel output signal and the look-up table output signal.

    Apparatus for recording/reproducing digital video signals in both a standard mode and a long playing mode
    40.
    发明授权
    Apparatus for recording/reproducing digital video signals in both a standard mode and a long playing mode 失效
    用于在标准模式和长播放模式下记录/再现数字视频信号的装置

    公开(公告)号：US4963992A

    公开(公告)日：1990-10-16

    申请号：US301462

    申请日：1989-01-26

    申请人： Nobukazu Doi ,  Yoshizumi Eto ,  Morishi Izumita ,  Seiichi Mita ,  Kazuyuki Takeshita

    发明人： Nobukazu Doi ,  Yoshizumi Eto ,  Morishi Izumita ,  Seiichi Mita ,  Kazuyuki Takeshita

    IPC分类号： H04N5/92 ,  G11B20/18 ,  H04N5/926 ,  H04N9/797

    CPC分类号： H04N9/797 ,  H04N5/926

    摘要： An apparatus for recording an reproducing a digital video signal is disclosed which includes n sampling circuits each for performing a sub-Nyquist sampling operation for the digital video signal in such a manner that the amount of data is reduced to one-n-th of an original amount (where n is a positive integer) and a pixel sampled by the sub-Nyquist sampling operation is not sampled by the remaining sampling circuits, recording/reproducing means for recording and reproducing information at all or part of pixels which are sampled by the n sampling circuits and a device for reconstructing the digital video signal from reproduced information at pixels with the aid of a synthesizing technique or interpolation technique.

    摘要翻译： 公开了一种用于记录再现数字视频信号的装置，其包括n个采样电路，每个采样电路用于对数字视频信号执行子奈奎斯特采样操作，使得数据量减少到数字视频信号的1 / 原始量（其中n是正整数）和通过亚奈奎斯特采样操作采样的像素不被剩余的采样电路采样，用于在全部或部分像素记录和再现信息的记录/再现装置 n个采样电路和用于通过合成技术或插值技术在像素处从再现信息重构数字视频信号的装置。