公开(公告)号：US3946564A

公开(公告)日：1976-03-30

申请号：US506901

申请日：1974-09-17

申请人： Tadao Nakagawa

发明人： Tadao Nakagawa

IPC分类号： B60T13/12 ,  B60T13/14 ,  F01K17/00

CPC分类号： B60T13/144

摘要： An oil-hydraulic servo-motor, usable with an automotive brake, including a control piston slidably extending through the rear end wall of a power cylinder in aligned opposite relation to an output piston therein and forming together with the cylinder end wall a spool-type control valve which is operable to energize and de-energize the power cylinder. The control piston is axially movable normally within definite limits under the operator's input, and abutment means provided to limit the extent of advancing movement of the control piston is rendered inoperable automatically upon failure of an associated oil pressure circuitry to enable the control piston to drive the output piston directly under the operator's input. The oil pressure circuitry may be formed in two independently operable systems. Major features include simplicity of the valving mechansim and hence of the entire structure of the servo-motor and a highly improved reliability in operation.

摘要翻译： 一种可用于汽车制动器的油压伺服电动机，其包括控制活塞，所述控制活塞可滑动地延伸穿过动力缸的后端壁，所述控制活塞与动力缸的后端壁对齐，并与缸体端壁一起形成阀芯型 控制阀，其可操作以对动力气缸通电和断电。 控制活塞在操作者输入下可以在一定范围内正常地轴向移动，并且提供用于限制控制活塞的前进运动的程度的邻接装置在相关联的油压回路故障时自动地变得不可操作，以使控制活塞能够驱动 输出活塞直接在操作员的输入下。 油压回路可以形成在两个可独立操作的系统中。 主要特征包括阀门机构的简单性以及伺服电动机的整体结构以及高度可靠的运行可靠性。

公开(公告)号：US08781029B2

公开(公告)日：2014-07-15

申请号：US13701963

申请日：2011-06-17

申请人： Tadao Nakagawa ,  Munehiro Matsui ,  Koichi Ishihara ,  Riichi Kudo ,  Takayuki Kobayashi ,  Etsushi Yamazaki ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi ,  Yutaka Miyamoto ,  Yasushi Takatori

发明人： Tadao Nakagawa ,  Munehiro Matsui ,  Koichi Ishihara ,  Riichi Kudo ,  Takayuki Kobayashi ,  Etsushi Yamazaki ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi ,  Yutaka Miyamoto ,  Yasushi Takatori

IPC分类号： H03K9/10 ,  H04L17/14

CPC分类号： H04L27/14 ,  H04B7/10 ,  H04B10/611 ,  H04B10/6164 ,  H04B17/327 ,  H04L27/2659 ,  H04L2027/0026 ,  H04L2027/0032 ,  H04L2027/0046

摘要： Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator. The frequency offset estimation apparatus converts the received signal sampled in advance with a predetermined sampling frequency into a frequency spectrum having N frequency components, limits a frequency band of negative frequency components from 1 to N/2 of the frequency spectrum and a frequency band of positive frequency components from N/2+1 to N of the frequency spectrum, calculates the sum of the squares of the positive frequency components of the frequency spectrum that have been subjected to frequency band limitation and the sum of the squares of the negative frequency components of the frequency spectrum that have been subjected to frequency band limitation to calculate power of the positive frequency components and power of the negative frequency components, and cyclically shifts all frequency components of the frequency spectrum in a frequency domain until the absolute value of a power difference between the power of the positive frequency components and the power of the negative frequency components is less than or equal to a predetermined threshold value, and estimates the frequency offset based on a shift amount until the absolute value is less than or equal to the threshold value.

摘要翻译： 提供一种频率偏移估计装置，其在估计作为接收信号的载波频率与本地振荡器的输出信号的频率之间的差的频率偏移时，适当地估计和补偿接收信号的频率偏移。 频率偏移估计装置将预先采样的接收信号以预定的采样频率转换成具有N个频率分量的频谱，将频谱的负频率分量的频带从1到N / 2限制，并且频带为正 频率分量从频谱的N / 2 + 1到N的频率分量计算已经经受频带限制的频谱的正频率分量的平方和的和的频率分量的平方和之和 已经进行了频带限制的频谱，以计算正频率分量的功率和负频率分量的功率，并且循环移位频域中的频谱的所有频率分量，直到频域中的频差的绝对值 正频率分量的功率和ne的功率 同步频率分量小于或等于预定阈值，并且基于偏移量来估计频率偏移，直到绝对值小于或等于阈值。

公开(公告)号：US20140016929A1

公开(公告)日：2014-01-16

申请号：US13981298

申请日：2012-01-24

申请人： Etsushi Yamazaki ,  Takayuki Kobayashi ,  Masahito Tomizawa ,  Riichi Kudo ,  Koichi Ishihara ,  Tadao Nakagawa ,  Mitsuteru Ishikawa

发明人： Etsushi Yamazaki ,  Takayuki Kobayashi ,  Masahito Tomizawa ,  Riichi Kudo ,  Koichi Ishihara ,  Tadao Nakagawa ,  Mitsuteru Ishikawa

IPC分类号： H04B10/079

CPC分类号： H04B10/07951 ,  H04B10/2513

摘要： A wavelength dispersion amount estimation method, a wavelength dispersion compensation circuit, and a receiving device which rapidly estimate and set a wavelength dispersion amount to compensate with high accuracy at the receiving device which compensates waveform distortion at an optical fiber transmission path. A wavelength dispersion compensation circuit includes an analog-digital converter which converts an optical analog waveform received from the optical fiber transmission path to a digital signal, a digital signal processor which compensates waveform distortion of the digital signal output from the analog-digital converter due to wavelength dispersion at the optical fiber transmission path with a dispersion compensation amount estimated with the wavelength dispersion amount estimation method, and a symbol clock extractor which extracts a symbol arrival timing clock of received data contained in the digital signal output from the analog-digital converter and outputs strength of the symbol arrival timing clock as the clock detection value.

摘要翻译： 波长色散量估计方法，波长色散补偿电路和接收装置，其快速估计和设置在补偿光纤传输路径上的波形失真的接收装置处以高精度补偿的波长色散量。 波长色散补偿电路包括将从光纤传输路径接收的光模拟波形转换为数字信号的模拟数字转换器，用于补偿由于模拟数字转换器输出的数字信号的波形失真，数字信号处理器由于 在具有由波长色散量估计方法估计的色散补偿量的光纤传输路径处的波长色散，以及符号时钟提取器，其提取包含在从模数转换器输出的数字信号中的接收数据的符号到达定时时钟，以及 输出符号到达定时时钟的强度作为时钟检测值。

公开(公告)号：US20130070874A1

公开(公告)日：2013-03-21

申请号：US13701963

申请日：2011-06-17

申请人： Tadao Nakagawa ,  Munehiro Matsui ,  Koichi Ishihara ,  Riichi Kudo ,  Takayuki Kobayashi ,  Etsushi Yamazaki ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi ,  Yutaka Miyamoto ,  Yasushi Takatori

发明人： Tadao Nakagawa ,  Munehiro Matsui ,  Koichi Ishihara ,  Riichi Kudo ,  Takayuki Kobayashi ,  Etsushi Yamazaki ,  Akihide Sano ,  Eiji Yoshida ,  Masato Mizoguchi ,  Yutaka Miyamoto ,  Yasushi Takatori

IPC分类号： H04L27/14

CPC分类号： H04L27/14 ,  H04B7/10 ,  H04B10/611 ,  H04B10/6164 ,  H04B17/327 ,  H04L27/2659 ,  H04L2027/0026 ,  H04L2027/0032 ,  H04L2027/0046

摘要： Provided is a frequency offset estimation apparatus that appropriately estimates and compensates for a frequency offset of a received signal when estimating the frequency offset which is the difference between a carrier frequency of the received signal and the frequency of an output signal of a local oscillator. The frequency offset estimation apparatus converts the received signal sampled in advance with a predetermined sampling frequency into a frequency spectrum having N frequency components, limits a frequency band of negative frequency components from 1 to N/2 of the frequency spectrum and a frequency band of positive frequency components from N/2+1 to N of the frequency spectrum, calculates the sum of the squares of the positive frequency components of the frequency spectrum that have been subjected to frequency band limitation and the sum of the squares of the negative frequency components of the frequency spectrum that have been subjected to frequency band limitation to calculate power of the positive frequency components and power of the negative frequency components, and cyclically shifts all frequency components of the frequency spectrum in a frequency domain until the absolute value of a power difference between the power of the positive frequency components and the power of the negative frequency components is less than or equal to a predetermined threshold value, and estimates the frequency offset based on a shift amount until the absolute value is less than or equal to the threshold value.

摘要翻译： 提供一种频率偏移估计装置，其在估计作为接收信号的载波频率与本地振荡器的输出信号的频率之间的差的频率偏移时，适当地估计和补偿接收信号的频率偏移。 频率偏移估计装置将预先采样的接收信号以预定的采样频率转换成具有N个频率分量的频谱，将频谱的负频率分量的频带从1到N / 2限制，并且频带为正 频率分量从频谱的N / 2 + 1到N的频率分量计算已经经受频带限制的频谱的正频率分量的平方和的和的频率分量的平方和之和 已经经过频带限制的频谱，以计算正频率分量的功率和负频率分量的功率，并且循环移位频域中的频谱的所有频率分量，直到频域中的功率差的绝对值 正频率分量的功率和ne的功率 同步频率分量小于或等于预定阈值，并且基于偏移量来估计频率偏移，直到绝对值小于或等于阈值。

公开(公告)号：US20120106618A1

公开(公告)日：2012-05-03

申请号：US13381114

申请日：2010-07-15

申请人： Riichi Kudo ,  Takayuki Kobayashi ,  Koichi Ishihara ,  Yasushi Takatori ,  Hideyuki Nosaka ,  Munehiro Matsui ,  Masato Mizoguchi ,  Tadao Nakagawa ,  Etsushi Yamazaki ,  Akihide Sano ,  Yutaka Miyamoto ,  Eiji Yoshida

发明人： Riichi Kudo ,  Takayuki Kobayashi ,  Koichi Ishihara ,  Yasushi Takatori ,  Hideyuki Nosaka ,  Munehiro Matsui ,  Masato Mizoguchi ,  Tadao Nakagawa ,  Etsushi Yamazaki ,  Akihide Sano ,  Yutaka Miyamoto ,  Eiji Yoshida

IPC分类号： H04L27/06 ,  H04L27/01

CPC分类号： H04L27/2672 ,  H04L25/03159 ,  H04L27/2633 ,  H04L27/265 ,  H04L27/266 ,  H04L2025/03414

摘要： A frequency domain multiplexed signal receiving method which decodes received signals that are multiplexed in a frequency domain, includes: a digital signal acquisition step of acquiring digital signals from the received signals that are multiplexed in the frequency domain; an offset discrete Fourier transform step of applying an offset discrete Fourier transform to odd discrete point numbers based on the acquired digital signals; and a decode step of decoding frequency domain digital signals in the frequency domain obtained by the offset discrete Fourier transform, and that are the frequency domain digital signals of one or more frequency channels.

摘要翻译： 一种频域复用信号接收方法，对在频域中被复用的接收信号进行解码，包括：数字信号获取步骤，从在频域中复用的接收信号中获取数字信号; 偏移离散傅立叶变换步骤，基于所获取的数字信号将偏移离散付里叶变换应用于奇数离散点数; 以及解码步骤，对通过偏移离散付里叶变换获得的频域中的频域数字信号进行解码，并且其是一个或多个频率信道的频域数字信号。

公开(公告)号：US5714896A

公开(公告)日：1998-02-03

申请号：US608559

申请日：1996-02-28

申请人： Tadao Nakagawa ,  Tsuneo Tsukahara ,  Masao Suzuki ,  Tsutomu Kamoto

发明人： Tadao Nakagawa ,  Tsuneo Tsukahara ,  Masao Suzuki ,  Tsutomu Kamoto

IPC分类号： G06F7/68 ,  H03K23/64 ,  H03K23/68 ,  H03L7/183 ,  H03L7/197 ,  H03K21/00

CPC分类号： H03L7/1974 ,  G06F7/68 ,  H03K23/68

摘要： A fractional-N frequency divider system generates an output signal having frequency of an input signal divided by a desired frequency division ratio (N+A/M) in which N is an integer and A/M is a fraction, A.ltoreq.M, and includes a programmable frequency divider receiving input frequency and providing divided frequency in which division ratio (N, N+1) is an integer and is externally supplied, a selector supplying one of the externally supplied integers (N, N+1) to the divider according to a selection signal, and a fractional part set having a first counter initialized to count M, a second counter initialized to count A, and a logic circuit for supplying the selection signal according to the counters. The counters are decremented by an output of the divider and reach zero when they receive M and A number of pulses, respectively. The second counter stops counting operation when it reaches zero. The logic circuit makes the selector select an integer N in a condition when content of the first counter is not zero and content of the second counter is zero, and N+1 in other conditions, so that the division ratio in the divider is N+1 for A number of output pulses of the divider among M number of output pulses, and is N for M-A number of the output pulses.

摘要翻译： 分数N分频器系统产生输出信号的频率除以N为整数且A / M为分数的期望分频比（N + A / M）的输入信号，A = M ，并且包括可编程分频器，其接收输入频率并提供分频比（N，N + 1）为整数并被外部提供的分频，选择器将外部提供的整数（N，N + 1）中的一个提供给 根据选择信号的分频器，以及具有初始化为计数M的第一计数器的初始化计数器A的第二计数器和用于根据计数器提供选择信号的逻辑电路的分数部分组。 计数器通过分频器的输出递减，当它们分别接收到M和A个脉冲时，它们达到零。 第二个计数器在零到达时停止计数操作。 逻辑电路使选择器在第一计数器的内容不为零并且第二计数器的内容为零并且在其他条件下为N + 1的条件中选择整数N，使得分频器中的分频比为N + 1表示M个输出脉冲之间的分频器的输出脉冲数，M为输出脉冲的N为N。

公开(公告)号：US4020481A

公开(公告)日：1977-04-26

申请号：US649156

申请日：1976-01-14

申请人： Tadao Nakagawa

发明人： Tadao Nakagawa

IPC分类号： G01F23/62 ,  B60T11/26 ,  G01F23/74 ,  G08B21/00

CPC分类号： G01F23/74

摘要： A fluid level alarm device which is capable of warning a person of a shortage in level of an operating fluid stored in a fluid tank and in which the critical fluid level at which an alarm signal is produced is determined with a maximized accuracy by positioning a magnetically operable reed switch, electrically connected to an alarm, within the tank at a predetermined vertical location in a manner so that, when the fluid stored in the tank is lowered below a specified level, said reed switch is magnetically closed to operate the alarm.

摘要翻译： 一种液位报警装置，其能够警告存储在流体箱中的工作流体的不足水平的人，其中通过磁性定位以最大的精度确定产生报警信号的临界液位 以预定的垂直位置在罐内电连接到报警器的操作簧片开关，使得当存储在箱中的流体降低到低于指定水平时，所述舌簧开关被磁性地关闭以操作报警器。

公开(公告)号：US09160600B2

公开(公告)日：2015-10-13

申请号：US13381114

申请日：2010-07-15

申请人： Riichi Kudo ,  Takayuki Kobayashi ,  Koichi Ishihara ,  Yasushi Takatori ,  Hideyuki Nosaka ,  Munehiro Matsui ,  Masato Mizoguchi ,  Tadao Nakagawa ,  Etsushi Yamazaki ,  Akihide Sano ,  Yutaka Miyamoto ,  Eiji Yoshida

发明人： Riichi Kudo ,  Takayuki Kobayashi ,  Koichi Ishihara ,  Yasushi Takatori ,  Hideyuki Nosaka ,  Munehiro Matsui ,  Masato Mizoguchi ,  Tadao Nakagawa ,  Etsushi Yamazaki ,  Akihide Sano ,  Yutaka Miyamoto ,  Eiji Yoshida

IPC分类号： H04B1/10 ,  H04L27/26 ,  H04L25/03

CPC分类号： H04L27/2672 ,  H04L25/03159 ,  H04L27/2633 ,  H04L27/265 ,  H04L27/266 ,  H04L2025/03414

摘要： A frequency domain multiplexed signal receiving method which decodes received signals that are multiplexed in a frequency domain, includes: a digital signal acquisition step of acquiring digital signals from the received signals that are multiplexed in the frequency domain; an offset discrete Fourier transform step of applying an offset discrete Fourier transform to odd discrete point numbers based on the acquired digital signals; and a decode step of decoding frequency domain digital signals in the frequency domain obtained by the offset discrete Fourier transform, and that are the frequency domain digital signals of one or more frequency channels.

摘要翻译： 一种频域复用信号接收方法，对在频域中被复用的接收信号进行解码，包括：数字信号获取步骤，从在频域中复用的接收信号中获取数字信号; 偏移离散傅立叶变换步骤，基于所获取的数字信号将偏移离散付里叶变换应用于奇数离散点数; 以及解码步骤，对通过偏移离散付里叶变换获得的频域中的频域数字信号进行解码，并且其是一个或多个频率信道的频域数字信号。

公开(公告)号：US08971703B2

公开(公告)日：2015-03-03

申请号：US13982507

申请日：2012-02-01

申请人： Etsushi Yamazaki ,  Takayuki Kobayashi ,  Masahito Tomizawa ,  Riichi Kudo ,  Koichi Ishihara ,  Tadao Nakagawa ,  Mitsuteru Ishikawa

发明人： Etsushi Yamazaki ,  Takayuki Kobayashi ,  Masahito Tomizawa ,  Riichi Kudo ,  Koichi Ishihara ,  Tadao Nakagawa ,  Mitsuteru Ishikawa

IPC分类号： H04B10/00 ,  H04B10/12 ,  H04B10/08 ,  H04B17/00 ,  H04B10/61 ,  G01M11/00 ,  H04B10/079

CPC分类号： H04B10/616 ,  G01M11/338 ,  H04B10/07951

摘要： A wavelength dispersion amount estimation method, a wavelength dispersion compensation circuit, and a receiving device which rapidly estimate and set a wavelength dispersion amount to compensate with high accuracy at the receiving device which compensates waveform distortion at an optical fiber transmission path. The wavelength dispersion compensation circuit includes an analog-digital converter which converts an optical analog waveform received from the optical fiber transmission path to a digital signal, a digital signal processor which compensates waveform distortion of the digital signal output from the analog-digital converter due to wavelength dispersion at the optical fiber transmission path with a dispersion compensation amount estimated with the wavelength dispersion amount estimation method, and a symbol clock extractor which extracts a symbol arrival timing clock of received data contained in the digital signal output from the analog-digital converter and outputs strength of the symbol arrival timing clock as the clock detection value.

摘要翻译： 波长色散量估计方法，波长色散补偿电路和接收装置，其快速估计和设置在补偿光纤传输路径上的波形失真的接收装置处以高精度补偿的波长色散量。 波长色散补偿电路包括将从光纤传输路径接收的光模拟波形转换为数字信号的模数转换器，数字信号处理器，其补偿由于模拟数字转换器输出的数字信号的波形失真 在具有由波长色散量估计方法估计的色散补偿量的光纤传输路径处的波长色散，以及符号时钟提取器，其提取包含在从模数转换器输出的数字信号中的接收数据的符号到达定时时钟，以及 输出符号到达定时时钟的强度作为时钟检测值。

公开(公告)号：US08929750B2

公开(公告)日：2015-01-06

申请号：US13318757

申请日：2010-05-18

申请人： Koichi Ishihara ,  Takayuki Kobayashi ,  Riichi Kudo ,  Yasushi Takatori ,  Munehiro Matsui ,  Masato Mizoguchi ,  Akihide Sano ,  Shogo Yamanaka ,  Etsushi Yamazaki ,  Yutaka Miyamoto ,  Eiji Yoshida ,  Tadao Nakagawa

发明人： Koichi Ishihara ,  Takayuki Kobayashi ,  Riichi Kudo ,  Yasushi Takatori ,  Munehiro Matsui ,  Masato Mizoguchi ,  Akihide Sano ,  Shogo Yamanaka ,  Etsushi Yamazaki ,  Yutaka Miyamoto ,  Eiji Yoshida ,  Tadao Nakagawa

IPC分类号： H04B10/06 ,  H04B10/2513 ,  H04B10/079 ,  H04B10/556 ,  H04B10/61 ,  H04L7/027

CPC分类号： H04B10/50 ,  H04B10/07951 ,  H04B10/2513 ,  H04B10/556 ,  H04B10/616 ,  H04B10/6161 ,  H04L7/027

摘要： To enable signal position detection, frequency offset compensation, clock offset compensation, and chromatic dispersion amount estimation in a communication system based on coherent detection using an optical signal, even on a signal having a great offset in an arrival time depending on a frequency due to chromatic dispersion. An optical signal transmitting apparatus generates specific frequency band signals having power concentrated on two or more specific frequencies and transmits a signal including the specific frequency band signals. An optical signal receiving apparatus converts a received signal into a digital signal, detects positions of the specific frequency band signals from the converted digital signal, estimates frequency positions of the detected specific frequency band signals, and detects a frequency offset between an optical signal receiving apparatus and an optical signal transmitting apparatus. Moreover, the optical signal receiving apparatus detects a clock offset between the optical signal receiving apparatus and the optical signal transmitting apparatus from an interval between the estimated frequency positions of the specific frequency band signals. Furthermore, the optical signal receiving apparatus estimates temporal positions of the detected specific frequency band signals and detects a chromatic dispersion amount from a difference between the temporal positions of the specific frequency band signals corresponding to different frequencies.

摘要翻译： 为了使基于使用光信号的相干检测的通信系统中的信号位置检测，频率偏移补偿，时钟偏移补偿和色散量估计，即使在到达时间上具有很大偏移的信号，这取决于由于 色散。 光信号发送装置产生具有集中在两个或更多个特定频率上的功率的特定频带信号，并发送包括特定频带信号的信号。 光信号接收装置将接收到的信号转换为数字信号，检测来自转换的数字信号的特定频带信号的位置，估计检测到的特定频带信号的频率位置，并检测光信号接收装置 和光信号发送装置。 此外，光信号接收装置从特定频带信号的估计频率位置之间的间隔检测光信号接收装置和光信号发送装置之间的时钟偏移。 此外，光信号接收装置估计检测到的特定频带信号的时间位置，并且根据与不同频率对应的特定频带信号的时间位置之间的差来检测色散量。