公开(公告)号：US5602835A

公开(公告)日：1997-02-11

申请号：US341976

申请日：1994-11-16

申请人： Takashi Seki ,  Yasushi Sugita ,  Tatsuya Ishikawa

发明人： Takashi Seki ,  Yasushi Sugita ,  Tatsuya Ishikawa

IPC分类号： H04L27/38 ,  H04J11/00 ,  H04L7/00 ,  H04L27/22 ,  H04L27/26

CPC分类号： H04L27/2665 ,  H04L27/2657 ,  H04L27/2662

摘要： An OFDM synchronization demodulation circuit includes a recovery circuit, an orthogonal axis demodulation circuit, a first and second delay circuit, a correlation calculation circuit, a guard timing detection circuit, and an OFDM signal demodulation circuit. The receiving circuit receives an orthogonal modulated wave based on an orthogonal frequency division multiplex (OFDM) modulated signal having an available symbol period and a guard period, where the guard period of the orthogonal modulated wave is based on a part of the available symbol period. The orthogonal axes demodulation circuit demodulates an in-phase axis detection signal and an orthogonal axis detection signal for the OFDM modulated wave from the receiving circuit using orthogonal detection. The first delay circuit delays the in-phase axis detection signal by the available symbol period, and the second delay circuit delays the orthogonal axis detection signal by the available symbol period. The correlation calculation circuit calculates coefficients of the correlations of the in-phase axis detection signal and the orthogonal axis detection signal from the orthogonal demodulation circuit with the output of the first or the second delay circuits. The guard timing detection circuit detects a timing of the guard period in the demodulation outputs from the orthogonal demodulation circuit. The OFDM signal demodulation circuit demodulates the OFDM modulated signal by extracting the available symbol period signal only from the demodulated output of the orthogonal demodulation circuit using the timing signal.

摘要翻译： OFDM同步解调电路包括恢复电路，正交轴解调电路，第一和第二延迟电路，相关计算电路，保护定时检测电路和OFDM信号解调电路。 接收电路基于具有可用符号周期和保护周期的正交频分复用（OFDM）调制信号接收正交调制波，其中正交调制波的保护周期基于可用符号周期的一部分。 正交轴解调电路使用正交检测来解调来自接收电路的OFDM调制波的同相轴检测信号和正交轴检测信号。 第一延迟电路将同相轴检测信号延迟可用符号周期，第二延迟电路将正交轴检测信号延迟可用符号周期。 相关计算电路将来自正交解调电路的同相轴检测信号和正交轴检测信号的相关性的系数与第一或第二延迟电路的输出进行计算。 保护定时检测电路检测来自正交解调电路的解调输出中的保护时段的定时。 OFDM信号解调电路通过使用定时信号仅从正交解调电路的解调输出提取可用符号周期信号来解调OFDM调制信号。

公开(公告)号：US5608764A

公开(公告)日：1997-03-04

申请号：US339697

申请日：1994-11-14

申请人： Yasushi Sugita ,  Tatsuya Ishikawa ,  Takashi Seki

发明人： Yasushi Sugita ,  Tatsuya Ishikawa ,  Takashi Seki

IPC分类号： H04L27/38 ,  H04J11/00 ,  H04L7/00 ,  H04L27/26 ,  H04L27/32 ,  H04L7/02

CPC分类号： H04L27/2657 ,  H04L27/2679

摘要： An OFDM synchronization demodulation circuit includes a receiving circuit for receiving an orthogonal frequency division multiplexing (OFDM) modulation signal. An orthogonal detection circuit orthogonally detects the OFDM modulation signal from the receiving circuit using a detected carrier. A demodulation circuit orthogonally demodulates the detected OFDM multiplex modulation signal from the orthogonal detection circuit by sampling the OFDM multiplex detection signal using a detected clock. A constellation analyzing circuit analyzes the constellation of demodulated symbols of predetermined carriers in the demodulated OFDM multiplex signal signal. A carrier frequency deviation detection circuit detects a frequency deviation of the detected carrier based on a rotation of the constellation of the demodulated symbol detected by the constellation analyzing circuit. A carrier detection circuit responsive to the frequency deviation detected by the carrier frequency deviation detection circuit controls the detected carrier. A clock frequency deviation detection circuit detects a frequency deviation of the detected clock based on rotations of the constellations of at least two demodulated symbols detected by the constellation analyzing circuit. A clock detection circuit controls the detected clock based on the frequency deviation detected by the clock frequency deviation detection circuit.

摘要翻译： OFDM同步解调电路包括用于接收正交频分复用（OFDM）调制信号的接收电路。 正交检测电路使用检测到的载波正交地检测来自接收电路的OFDM调制信号。 解调电路通过使用检测到的时钟对OFDM多路复用检测信号进行采样来正交地解调来自正交检测电路的检测的OFDM多路复用调制信号。 星座分析电路分析解调的OFDM多路复用信号信号中预定载波的解调符号的星座。 载波频率偏差检测电路基于由星座分析电路检测到的解调符号的星座的旋转来检测检测到的载波的频率偏差。 响应于由载波频率偏差检测电路检测到的频率偏差的载波检测电路控制检测到的载波。 时钟频率偏差检测电路根据由星座分析电路检测到的至少两个解调符号的星座的旋转来检测检测到的时钟的频率偏差。 时钟检测电路基于由时钟频率偏差检测电路检测到的频率偏差来控制检测到的时钟。

公开(公告)号：US5771224A

公开(公告)日：1998-06-23

申请号：US619211

申请日：1996-03-21

申请人： Takashi Seki ,  Noboru Taga ,  Shigeru Okita ,  Tatsuya Ishikawa

发明人： Takashi Seki ,  Noboru Taga ,  Shigeru Okita ,  Tatsuya Ishikawa

IPC分类号： H04L27/18 ,  H04J11/00 ,  H04L5/02 ,  H04L27/26 ,  H04L27/34

CPC分类号： H04L27/2657 ,  H04L27/18 ,  H04L27/2613 ,  H04L27/2675 ,  H04L27/34 ,  H04L25/0232 ,  H04L25/03159 ,  H04L27/2662 ,  H04L5/0048

摘要： A transmission system is disclosed which permits the receiving end to demodulate multi-valued modulated symbols successfully under fading conditions and reduces the amount of transmitted reference data to improve data transmission efficiency. At the transmitting end, a multiplexing section, a modulating section, and a transmitting section are provided. In transmitting an OFDM transmission frame, null symbols and reference symbols are placed in the beginning portion of the frame and QPSK symbols are placed in an information symbol data region in the frame with equal spacings in time and frequency. At the receiving end, a receiving section, a demodulation section, an equalizing section, and a demultiplexing section are provided. An error detector detects amplitude and phase errors of each carrier from the reference symbols, and a variation detector detects variations in the amplitude and phase of a received signal from the QPSK symbols. The carrier amplitude and phase errors are corrected by a correction information producing section on the amplitude and phase variations of the received signal detected by the variation detector to produce correction information. The equalizing section equalizes the demodulated symbol data according to the correction information.

摘要翻译： 公开了一种传输系统，其允许接收端在衰落条件下成功解调多值调制符号，并减少传输的参考数据量以提高数据传输效率。 在发送端，提供复用部分，调制部分和发送部分。 在发送OFDM传输帧时，将空符号和参考符号放置在帧的开始部分，并且将QPSK符号放置在帧中的时间和频率上等间隔的信息符号数据区域中。 在接收端设置有接收部分，解调部分，均衡部分和解复用部分。 误差检测器从参考符号检测每个载波的幅度和相位误差，并且变化检测器检测来自QPSK符号的接收信号的幅度和相位的变化。 载波振幅和相位误差由校正信息产生部分对由变化检测器检测到的接收信号的幅度和相位变化进行校正，以产生校正信息。 均衡部根据校正信息对解调符号数据进行均衡。

公开(公告)号：US5646935A

公开(公告)日：1997-07-08

申请号：US405625

申请日：1995-03-15

申请人： Tatsuya Ishikawa ,  Takashi Seki

发明人： Tatsuya Ishikawa ,  Takashi Seki

IPC分类号： H04L27/34 ,  H04J11/00 ,  H04L1/00 ,  H04L27/18 ,  H04L27/26 ,  H04J15/00

CPC分类号： H04L1/0071 ,  H04L27/2604

摘要： A hierarchical quadrature frequency multiplex signal transmission apparatus that produces a plurality of modulated signals in which multiple layers of hierarchical information data are associated with a plurality of hierarchically graded modulation forms. The apparatus also interleaves symbols within a frame of the hierarchical information data in both a time axis and a frequency axis. In addition, the apparatus may differentially encode one of the hierarchically graded modulation forms. Further, the apparatus performs an inverse Fourier transform on the symbols, by associating each of the plurality of hierarchically graded modulation forms with a corresponding predetermined carrier. Also disclosed is an apparatus for receiving the hierarchical quadrature frequency multiplex signal and the format of the hierarchical quadrature frequency multiplex signal.

摘要翻译： 一种分层正交频率复用信号发送装置，其产生多个分层信息数据与多个分级调制形式相关联的多个调制信号。 该装置还在时间轴和频率轴上在分层信息数据的帧的帧内交织符号。 另外，该装置可以差分地编码分级调制形式之一。 此外，该装置通过将多个分级梯度调制形式中的每一个与相应的预定载波相关联来对符号执行逆傅里叶变换。 还公开了一种用于接收分级正交频率复用信号和分层正交频率复用信号格式的装置。

公开(公告)号：US08949086B2

公开(公告)日：2015-02-03

申请号：US13356802

申请日：2012-01-24

申请人： Tatsuya Ishikawa

发明人： Tatsuya Ishikawa

IPC分类号： G06F7/60 ,  G06F17/10 ,  G06F17/50

CPC分类号： G06F17/5009 ,  G06F2217/16

摘要： Methods, an apparatus, and a computer program product for determining whether or not a particle belongs to free surface particles, in a calculation process of a particle method in which a continuum subjected to calculation analysis is collectively modeled with a free surface by a plurality of particles. One of the methods includes the steps of: determining whether any other particle exists within a predetermined range with respect to the particle by referencing to identification information stored in a memory, where the other particle belongs to the free surface, and storing in the memory near free surface identification information which is set as near free surface if the other particle belonging to the free surface exists and set as sufficiently inside if the other free surface particle belonging to the free surface does not exist.

公开(公告)号：US20130054206A1

公开(公告)日：2013-02-28

申请号：US13593586

申请日：2012-08-24

申请人： Tatsuya Ishikawa

发明人： Tatsuya Ishikawa

IPC分类号： G06F17/10

CPC分类号： G06F17/5009 ,  G06F2217/16

摘要： Methods, an apparatus, and a computer program product for determining whether or not a particle belongs to free surface particles, in a calculation process of a particle method in which a continuum subjected to calculation analysis is collectively modeled with a free surface by a plurality of particles. One of the methods includes the steps of: determining whether any other particle exists within a predetermined range with respect to the particle by referencing to identification information stored in a memory, where the other particle belongs to the free surface, and storing in the memory near free surface identification information which is set as near free surface if the other particle belonging to the free surface exists and set as sufficiently inside if the other free surface particle belonging to the free surface does not exist.

摘要翻译： 在粒子方法的计算过程中，用于确定粒子是否属于自由表面粒子的方法，装置和计算机程序产品，其中经受计算分析的连续体通过多个 粒子。 其中一种方法包括以下步骤：通过参考存储在存储器中的识别信息来确定相对于粒子在预定范围内是否存在任何其他粒子，其中另一粒子属于自由表面，并且存储在存储器中 如果不存在属于自由表面的其他自由表面颗粒，则属于自由表面的其他颗粒存在并设定为足够内部的自由表面识别信息被设置为近自由表面。

公开(公告)号：US20120190469A1

公开(公告)日：2012-07-26

申请号：US13358803

申请日：2012-01-26

申请人： Masayoshi Arakawa ,  Tetsuya Nakamura ,  Takanori Shibui ,  Tatsuya Ishikawa ,  Masataka Kai ,  Naoyuki Miyagawa

发明人： Masayoshi Arakawa ,  Tetsuya Nakamura ,  Takanori Shibui ,  Tatsuya Ishikawa ,  Masataka Kai ,  Naoyuki Miyagawa

IPC分类号： A63B69/36 ,  G01S13/58

CPC分类号： G01S13/58 ,  A63B24/0021 ,  A63B60/46 ,  A63B69/0002 ,  A63B69/36 ,  A63B69/38 ,  A63B2024/0031 ,  A63B2071/0694 ,  A63B2102/02 ,  A63B2102/18 ,  A63B2102/32 ,  A63B2220/30 ,  A63B2220/35 ,  A63B2220/806 ,  A63B2225/50 ,  A63B2243/0025 ,  G01S13/867

摘要： A measurement apparatus includes a first Doppler sensor which outputs a first transmission signal and receives a first Doppler signal, that is the first transmission signal returned after being reflected by an impacting object, a timing detection unit that detects an impact timing which is a moment when an impacted object is impacted by the impacting object, an impacting object speed computing unit that computes a speed of the impacting object based on the first Doppler signals obtained from the detected impact timing to a timing before a predetermined period, and an imaging unit that images the impacted object immediately after the impact so as to be used for computing a motion state of the impacted object, based on the computed speed of the impacting object.

摘要翻译： 测量装置包括第一多普勒传感器，其输出第一传输信号并接收第一多普勒信号，即第一多普勒信号，即在被撞击物体反射之后返回的第一传输信号;定时检测单元，其检测作为 影响对象受冲击物体影响，影响对象速度计算单元，其基于从检测到的冲击定时获得的第一多普勒信号到预定时段之前的定时来计算冲击对象的速度;以及成像单元，该图像 受影响的物体紧接在冲击之后，以便用于计算受影响物体的运动状态，基于所计算的冲击物体的速度。

公开(公告)号：US20100245685A1

公开(公告)日：2010-09-30

申请号：US12645824

申请日：2009-12-23

申请人： Shinji ONODERA ,  Tatsuya Ishikawa ,  Yusuke Mukai ,  Satomi Morishita

发明人： Shinji ONODERA ,  Tatsuya Ishikawa ,  Yusuke Mukai ,  Satomi Morishita

IPC分类号： H04N3/26

CPC分类号： H04N9/3185 ,  G03B21/006

摘要： In the usage of table projection of a projection type display, depending upon a sitting position of a participant of a conference, the participant views an image projected upon a table as an inversion image turned upside down, resulting in poor visual recognition. In order to improve visual recognition, images are rotated, synthesized and displayed in accordance with the viewing direction of each participant. More specifically, the projection type display is provided with a two-image synthesizing unit for synthesizing two images obtained by processing an input image by two image rotation units for rotating the input image by a first angle and a second angle different from the first angle, into one image on a screen. The projection type display is also provided with an image rotation unit and an image inversion unit for two-image display on a screen.

摘要翻译： 在投影型显示器的桌面投影的使用中，根据会议的参与者的坐姿，参与者将投影在桌子上的图像视为颠倒的反转图像，导致视觉识别差。 为了改善视觉识别，根据每个参与者的观看方向旋转，合成和显示图像。 更具体地，投影型显示器设置有两个图像合成单元，用于合成通过两个图像旋转单元处理输入图像而获得的两个图像，用于使输入图像旋转第一角度和不同于第一角度的第二角度， 在屏幕上形成一个图像。 投影型显示器还设置有用于在屏幕上进行双图像显示的图像旋转单元和图像反转单元。

公开(公告)号：US20090150661A1

公开(公告)日：2009-06-11

申请号：US12188105

申请日：2008-08-07

申请人： Hiroaki Yago ,  Tomohiro Suzuki ,  Tatsuya Ishikawa ,  Tomoya Ogawa ,  Fumikage Uchida ,  Munetoshi Eguchi

发明人： Hiroaki Yago ,  Tomohiro Suzuki ,  Tatsuya Ishikawa ,  Tomoya Ogawa ,  Fumikage Uchida ,  Munetoshi Eguchi

IPC分类号： G06F9/445

CPC分类号： G06F9/4406

摘要： An information processing apparatus including: a first recording medium which stores a first program; a connection section which is capable of connecting to a second recording medium outside of the information processing apparatus; an instruction input section to input, while the information processing apparatus is in an activated state, an instruction for booting a second program stored in the second recording medium that is connected to the connection section on booting of the BIOS; and a controller which, performs a check when booting of a BIOS, if the second recording medium is connected and the instruction has been input while the information processing apparatus is in an activated state; in case when the second recording medium is connected and the instruction has been input is confirmed, the control section boots the second program; and in case when it is not confirmed, the control section boots the first program.

摘要翻译： 一种信息处理设备，包括：存储第一程序的第一记录介质; 连接部，其能够连接到信息处理装置外部的第二记录介质; 指令输入部分，当所述信息处理装置处于激活状态时，输入用于引导存储在所述第二记录介质中的第二程序的指令，所述第二程序在所述BIOS启动时连接到所述连接部分; 以及控制器，当所述信息处理装置处于激活状态时，如果连接了所述第二记录介质并且已经输入了所述指令，则在引导BIOS时执行检查; 在连接第二记录介质并且已经输入指令的情况下，控制部分引导第二程序; 并且在未被确认的情况下，控制部分启动第一程序。

公开(公告)号：US07049948B2

公开(公告)日：2006-05-23

申请号：US10830395

申请日：2004-04-23

申请人： Daisuke Yagi ,  Tatsuya Ishikawa ,  Masaya Sugita

发明人： Daisuke Yagi ,  Tatsuya Ishikawa ,  Masaya Sugita

IPC分类号： B60C23/00

CPC分类号： B60C23/0408

摘要： A tire pressure monitoring system includes an on-board detection unit configured to transmit a detection signal indicative of the presence of an occupant entering a vehicle, a vehicle-body-based unit configured to receive the detection signal and transmit a transmission request to receive at least one air pressure signal indicative of tire pressure of the vehicle, and at least one tire-based unit configured to receive the transmission request, measure the tire pressure and transmit the air pressure signal.

摘要翻译： 轮胎压力监测系统包括：车载检测单元，被配置为发送指示进入车辆的乘员的存在的检测信号;车辆身体单元，被配置为接收检测信号并发送传输请求以在 指示车辆的轮胎压力的至少一个空气压力信号，以及配置成接收传动请求的至少一个基于轮胎的单元，测量轮胎压力并传送空气压力信号。