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    Circuit for cancelling whole or part of a waveform using nonrecursive and recursive filters
    4.
    发明授权
    Circuit for cancelling whole or part of a waveform using nonrecursive and recursive filters 失效
    使用非递归和递归滤波器消除波形的全部或部分的电路

    公开(公告)号：US5042026A

    公开(公告)日：1991-08-20

    申请号：US161808

    申请日：1988-02-29

    Applicant: Shin'ichi Koike ,  Masaru Yamaguchi ,  Masanobu Arai ,  Takenori Ogata

    Inventor： Shin'ichi Koike ,  Masaru Yamaguchi ,  Masanobu Arai ,  Takenori Ogata

    IPC: H03H17/02 ,  H04B3/23

    CPC classification number: H04B3/235 ,  H03H17/0288 ,  H04B3/238

    Abstract: The whole or part of a waveform is cancelled by a circuit comprising a nonrecursive filter and a recursive filter. The nonrecursive filter has a plurality of first multipliers having first tap weights for modifying symbols successively shifted along a shift register. The recursive filter is connected in a series circuit to the shift register and has a second tap weight for recursively modifying the output of the shift register. The recursively modified symbol is modified by a second multiplier having a third tap weight and combined in an adder with the symbols modified by the first tap weights to produce a replica of an undesired waveform. The replica is destructively combined in a subtractor with an incoming symbol having an undesired waveform. The output of subtractor is utilized to derive the tap weights to adaptively control the inputs to the adder.

    Receiver capable of improving signal-to-noise ratio in reproducing digital signal
    5.
    发明授权
    Receiver capable of improving signal-to-noise ratio in reproducing digital signal 失效
    能够在再现数字信号时提高信噪比的接收机

    公开(公告)号：US4972433A

    公开(公告)日：1990-11-20

    申请号：US249068

    申请日：1988-09-26

    Applicant: Masaru Yamaguchi ,  Masanobu Arai ,  Takenori Ogata

    Inventor： Masaru Yamaguchi ,  Masanobu Arai ,  Takenori Ogata

    IPC: H04B1/10 ,  H04B1/16 ,  H04B3/06 ,  H04L25/03

    CPC classification number: H04L25/03057

    Abstract: In a receiver comprising a filter section for filtering a transmitted digital signal into a filtered digital signal and an equalizer section for equalizing the filtered digital signal into an equalized digital signal as a reproduced digital signal in response to controllable tap gains supplied from a control arrangement, the equalizer section comprises a first arrangement for filtering the filtered digital signal in response to predetermined ones of the controllable tap gains to produce an intermediate digital signal and a second arrangement for equalizing the intermediate digital signal into the equalized digital signal in response to remaining ones of the controllable tap gains except for the predetermined controllable tap gains to produce the reproduced digital signal. The control arrangement controls the predetermined tap gains so as to minimize noise power of a noise signal accompanying the filtered digital signal and the remaining controllable tap gains and to equalize the intermediate digital signal into the equalized digital signal.

    Abstract translation: 在包括用于将所发送的数字信号滤波成滤波数字信号的滤波器部分的接收机和用于响应于从控制装置提供的可控抽头增益而将滤波后的数字信号均衡为均衡的数字信号作为再现的数字信号的均衡器部分， 均衡器部分包括第一装置，用于响应于可控抽头增益中的预定的抽头增益来滤波滤波后的数字信号，以产生中间数字信号;以及第二装置，用于响应于剩余的数字信号将中间数字信号均衡为均衡的数字信号 可控抽头增益除了预定的可控抽头增益以产生再现的数字信号。 控制装置控制预定的抽头增益，以使伴随滤波数字信号的噪声信号的噪声功率和剩余的可控抽头增益最小化，并将中间数字信号均衡为均衡的数字信号。

    Digital automatic line equalizer with means for controlling tap gains of transversal filter based on mean power of output from the filter
    6.
    发明授权
    Digital automatic line equalizer with means for controlling tap gains of transversal filter based on mean power of output from the filter 失效
    数字自动线路均衡器，具有根据滤波器输出的平均功率来控制横向滤波器的抽头增益的装置

    公开(公告)号：US4872184A

    公开(公告)日：1989-10-03

    申请号：US222482

    申请日：1988-07-21

    Applicant: Masaru Yamaguchi ,  Takenori Ogata

    Inventor： Masaru Yamaguchi ,  Takenori Ogata

    IPC: H03H15/00 ,  H03H17/00 ,  H03H21/00 ,  H04B3/14 ,  H04L25/03 ,  H04L25/04

    CPC classification number: H04L25/03038

    Abstract: A digital automatic line equalizer for compensating distortion of a digital signal transmitted through a transmission line comprises a transversal filter having a set of tap gains for producing an equalized signal as a filter output from the digital signal incoming thereto. A first multiplier squares a current one of the filter output to produce a squared signal and other multipliers multiply the current and the previous ones of the filter outputs to produce product signals. In a calculator, the product signals are weighted and are, thereafter, summed together with the squared signal to produce summed signals which are averaged for a predetermined time duration into a mean value. A controller has a plurality of sets of values for the set of tap gains, compares the mean value with a reference value to produce an error signal and determines one set of the plurality of sets of values in response to the error signal to make the set of tap gains equal to the set of values thereby to maintain the mean value to the reference value so that the transversal filter produces the equalized signal.

    Abstract translation: 用于补偿通过传输线传输的数字信号的失真的数字自动线路均衡器包括具有一组抽头增益的横向滤波器（11），用于产生作为从其输入的数字信号的滤波器输出的均衡信号。 第一乘法器（200）对滤波器输出中的当前一个进行平方以产生平方信号，并且其他乘法器（201-20l）将当前和先前的滤波器输出乘以产生乘积信号。 计算器（21）根据平方信号和乘积信号计算平均信号和称重产品信号之和的平均值，该预定持续时间。 控制器（15）根据平均值确定一组值，使抽头增益集合等于该值集合，从而将平均值保持为预定值作为参考值，使得横向滤波器（11）产生 均衡信号。 计算器（21）可以包括用于产生称重产品信号的多个称重电路（22），用于产生和的加法器（25）和用于产生平均值的平均器（26）。 控制器（15）可以包括用于比较平均值和参考值以产生误差信号的比较器（27），用于存储用于该抽头增益集合的多组值的存储器（30） 控制器（29），用于响应于所述误差信号选择所述多组值中的一个。

    Detection system for abnormal cable connections in communication apparatuses
    7.
    发明授权
    Detection system for abnormal cable connections in communication apparatuses 失效
    通信设备异常电缆连接检测系统

    公开(公告)号：US5448574A

    公开(公告)日：1995-09-05

    申请号：US389745

    申请日：1995-02-15

    Applicant: Masaru Yamaguchi

    Inventor： Masaru Yamaguchi

    IPC: G01R31/02 ,  G01R31/04 ,  G01R31/08 ,  H04M3/26 ,  G06F11/00

    CPC classification number: G01R31/041

    Abstract: In a communication apparatus in which a first level unit, a second level unit and a third level unit are hierarchically arranged and these units are connected to one another by multicore cables, one of the many cores of each multicore cable is used as monitoring core, and the first level unit sends out to each monitoring core a probe signal generated by sampling the digital signals supplied via the individual cores of the multicore cable and multiplexing them on a time-division basis. The second level unit compares each of these probe signals and a string of signal samples supplied via the multicore cable corresponding to this probe signal, generates a faulty connection indicating signal in response to any discrepancy between them; generates, similarly to the first level unit, a probe signal for detecting any faulty connection between the second level and third level units; multiplexes these signals on a time-division basis; and inserts the multiplexed signal into the monitoring core to the third level unit. The third level unit, on the basis of the probe signal for this signal supplied via the monitoring core, can display a faulty connection signal both for each multicore cable and for each individual core.

    Abstract translation: 在第一级单元，第二级单元和第三级单元分层布置并且这些单元通过多芯电缆彼此连接的通信设备中，每个多芯电缆的多个核心之一用作监视核心， 并且第一级单元向每个监视核心发送通过对通过多芯电缆的各个核提供的数字信号进行采样而产生的探测信号，并且以时分复用它们。 第二级单元将这些探测信号和通过与该探测信号相对应的多芯电缆提供的一串信号样本进行比较，响应于它们之间的任何差异而产生故障连接指示信号; 与第一级单元类似地产生用于检测第二级和第三级单元之间的任何故障连接的探测信号; 以时分复用这些信号; 并将多路复用的信号插入监控核心到第三级单元。 基于通过监控核心提供的该信号的探测信号，第三级单元可以显示针对每个多芯电缆和每个单独核心的故障连接信号。

    Partial response system
    9.
    发明授权
    Partial response system 失效
    部分反应系统

    公开(公告)号：US4097687A

    公开(公告)日：1978-06-27

    申请号：US731960

    申请日：1976-10-13

    Applicant: Masaru Yamaguchi

    Inventor： Masaru Yamaguchi

    IPC: H04B3/04 ,  H04L25/497 ,  H04L3/00

    CPC classification number: H04L25/497

    Abstract: A partial response system useful in binary data communication systems is disclosed. The partial response system includes a transmission system adapted to provide an output having a frequency spectrum substantially given by 2j sin �.omega.T/2.multidot.k! in response to a single pulse input of pulse width T. A precode-converter is provided at the input side of the transmission system, and a waveform converter is inserted between the pre-code-converter and the transmission system. The frequency spectrum of the output of the waveform converter in response to a single pulse applied to its input is substantially equal to either 2j�(1 -cos �(.omega./2.multidot.T!)/.omega.! or 2j(1-cos.omega.T)/.omega.. The transmission system includes a waveform shaping filter having a transfer function represented substantially by either ##EQU1## Since the filter characteristic involves only an amplitude-characteristic, the design of the filter is greatly simplified.

    Abstract translation: 公开了一种在二进制数据通信系统中有用的部分响应系统。 部分响应系统包括传输系统，其适于响应于脉冲宽度T的单个脉冲输入而提供具有基本上由2jsinωω/ 2kk给出的频谱的输出。在输入侧提供预编码转换器 的传输系统，并且在该代码转换器与传输系统之间插入波形转换器。 响应于施加到其输入的单个脉冲，波形转换器的输出的频谱基本上等于2j [（1-cos（ω/ 2xT））/ω或2j（1-cosω-T） / omega。传输系统包括具有基本上由 + tr 表示的传递函数的波形整形滤波器。由于滤波器特性仅涉及幅度特性，所以滤波器的设计被大大简化。

    Alloy for mold
    10.
    发明授权
    Alloy for mold 失效
    合金用于模具

    公开(公告)号：US3988176A

    公开(公告)日：1976-10-26

    申请号：US492311

    申请日：1974-07-26

    Applicant: Seizo Watanabe ,  Koji Kitazawa ,  Minoru Maeda ,  Masaru Yamaguchi

    Inventor： Seizo Watanabe ,  Koji Kitazawa ,  Minoru Maeda ,  Masaru Yamaguchi

    IPC: B22D11/059 ,  C22C9/02 ,  C22C9/06 ,  B22D13/10 ,  C22C9/10

    CPC classification number: B22D11/059 ,  C22C9/02 ,  C22C9/06

    Abstract: A mold for continuous casting made of a copper alloy having been subjected to 15 to 40% cold working, said alloy consisting of copper as main constituent and an addition of 0.18 to 0.85% by weight of tin, and, if desired, several other metal components, the alloy having a high softening temperature and high-temperature strength, whose numerical values are given by specific formulas in which the thermal conductivity .lambda. is a determining factor which, in itself, is dependent on the construction of the mold, operating conditions etc.

    Abstract translation: 一种由铜合金制成的连续铸造模具，其进行了15〜40％的冷加工，所述合金由铜作为主要成分，添加了0.18〜0.85重量％的锡，如果需要，还可以加入几种其他金属 组分，具有高软化温度和高温强度的合金，其数值由具体公式给出，其中热导率λ本身是决定因素，其本身取决于模具的构造，操作条件等 。

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