利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

25 条记录 (耗时 0.014 秒)

    Phase detecting circuit
    3.
    发明授权
    Phase detecting circuit 失效
    相位检测电路

    公开(公告)号：US4803385A

    公开(公告)日：1989-02-07

    申请号：US17625

    申请日：1987-02-24

    申请人： Hizuru Nawata

    发明人： Hizuru Nawata

    IPC分类号： H03K5/26 ,  G01R25/00 ,  H03L7/00 ,  H03L7/085

    CPC分类号： G01R25/00

    摘要： A phase detecting circuit for detecting a phase differential between a reference clock and a bit timing extracted from a demodulated signal, which is derived from a modulation wave modulated by a digital signal. The circuit successfully eliminates points of discontinuity in the phase detection characteristic of a phase detector and, therefore, accurately determines a phase differential between the bit timing and the reference clock with no regard to the magnitude of the phase differential of an input. An absolute value averaging circuit is provided for averaging the absolute valves of a plurality of consecutive outputs of a phase detector. A sign majority decision circuit is provided for producing one of positive and negative signs of the consecutive outputs of the phase detector which is decided by majority. Further, a multiplier is provided for multiplying an output of the absolute value averaging circuit and an output of the majority decision circuit, the resulting product being delivered as a phase differential.

    摘要翻译： 一种相位检测电路，用于检测从由数字信号调制的调制波导出的解调信号提取的参考时钟和比特定时之间的相位差。 电路成功地消除了相位检测器的相位检测特性中的不连续点，因此，不考虑输入的相位差的大小，精确地确定位定时和参考时钟之间的相位差。 提供绝对值平均电路，用于对相位检测器的多个连续输出的绝对阀进行平均。 提供符号多数决定电路，用于产生由多数决定的相位检测器的连续输出的正和负符号之一。 此外，提供乘法器用于将绝对值平均电路的输出和多数判定电路的输出相乘，所得到的乘积被递送为相位差。

    SERIAL SIGNAL TRANSMISSION SYSTEM
    4.
    发明申请
    SERIAL SIGNAL TRANSMISSION SYSTEM 审中-公开
    串行信号传输系统

    公开(公告)号：US20090036168A1

    公开(公告)日：2009-02-05

    申请号：US11994669

    申请日：2006-08-01

    申请人： Hizuru Nawata ,  Shintaro Soma ,  Koji Hoshina ,  Yuzo Yoneyama

    发明人： Hizuru Nawata ,  Shintaro Soma ,  Koji Hoshina ,  Yuzo Yoneyama

    IPC分类号： H04W88/00

    CPC分类号： H04L1/0079 ,  H04L1/0068

    摘要： A transmission device includes signal synthesizer 16 that replaces the least significant bits of a plurality of transmission and reception target data that are digital signals with bit data of a desired control signal that is a digital signal, and serial signal converter 17 that converts the output signal from the signal synthesizer into a serial signal and transmits the serial signal. On the other hand, a reception device includes parallel signal converter 21 that converts the received serial signal into a parallel signal to acquire transmission and reception target data, and signal separator 23 that extracts the bit data of the control signal from the respective least significant bits of transmission and reception target data output by parallel signal converter 21.

    摘要翻译： 发送装置包括：信号合成器16，其将作为数字信号的多个发送和接收目标数据中的最低有效位替换为作为数字信号的期望控制信号的位数据;以及串行信号转换器17，其将输出信号 从信号合成器进入串行信号并发送串行信号。 另一方面，接收装置包括并行信号转换器21，其将接收到的串行信号转换为并行信号以获取发送和接收目标数据;以及信号分离器23，其从相应的最低有效位提取控制信号的位数据 由并行信号转换器21输出的发送和接收目标数据。

    Vacancy information search system
    5.
    发明申请
    Vacancy information search system 审中-公开
    空缺信息搜索系统

    公开(公告)号：US20050256855A1

    公开(公告)日：2005-11-17

    申请号：US11110802

    申请日：2005-04-21

    申请人： Shintaro Soma ,  Hizuru Nawata ,  Ken Kasagi

    发明人： Shintaro Soma ,  Hizuru Nawata ,  Ken Kasagi

    IPC分类号： G06F17/30 ,  G06Q30/06 ,  G06Q50/00 ,  H04M3/42 ,  H04M11/00

    CPC分类号： G06Q10/02

    摘要： A vacancy information search system includes a vacancy information storage unit, reserved business entity storage unit, priority setting unit, and search unit. the vacancy information storage unit stores business entity vacancy information. The reserved business entity storage unit stores the log of a business entity reserved by a user. The priority setting unit sets a priority given by the user for the reserved business entity stored in the reserved business entity storage unit. The search unit accesses the vacancy information storage unit in response to a request from the user and searches for vacancy information of the reserved business entity of the user, which is stored in the reserved business entity storage unit, in order of priorities set for the reserved business entity. A vacancy information search method is also disclosed

    摘要翻译： 空缺信息搜索系统包括空缺信息存储单元，预约业务实体存储单元，优先级设置单元和搜索单元。 空缺信息存储单元存储商业实体空缺信息。 保留业务实体存储单元存储用户保留的业务实体的日志。 优先级设置单元为存储在预约业务实体存储单元中的预留业务实体设置由用户给出的优先级。 搜索单元响应于来自用户的请求访问空缺信息存储单元，并且按照为预约设置的优先级顺序搜索存储在预约业务实体存储单元中的用户的预留业务实体的空白信息 商业实体。 还公开了空缺信息搜索方法

    Satellite communication conference system for use in a satellite communication system
    6.
    发明授权
    Satellite communication conference system for use in a satellite communication system 失效
    用于卫星通信系统的卫星通信会议系统

    公开(公告)号：US06246873B1

    公开(公告)日：2001-06-12

    申请号：US08750019

    申请日：1997-03-11

    申请人： Brian George Flowers ,  Johannes Egbertus Van Osch ,  Hizuru Nawata

    发明人： Brian George Flowers ,  Johannes Egbertus Van Osch ,  Hizuru Nawata

    IPC分类号： H04M342

    CPC分类号： H04N7/20 ,  H04N7/15 ,  H04W4/06 ,  H04W84/06

    摘要： A conference station for use in a satellite conferencing system is arranged to receive communications on at least one satellite communication channel having a given frequency and to transmit communications on at least one satellite communication channel having a given frequency. The conference station itself controls whether or not the conference station can transmit on a satellite communication transmission channel by enabling transmission on a communication channel only when the conference station itself determines that that satellite communication channel is free for use or unoccupied. The conference station is also responsive to data signals received from a conference control station to adjust the satellite communication channel frequency or frequencies on which the conference station is able to receive or transmit signal. The conference station may form a part of a group of similar conference stations to which the same communication channels are allocated.

    摘要翻译： 用于卫星会议系统的会议台被安排为在具有给定频率的至少一个卫星通信信道上接收通信，并且在具有给定频率的至少一个卫星通信信道上发送通信。 会议站本身控制会议站是否可以通过仅在会议台本身确定该卫星通信信道是空闲或未占用的情况下通过在通信信道上进行传输来在卫星通信传输信道上进行发送。 会议台还响应于从会议控制站接收的数据信号，以调整卫星通信信道频率或会议台能够接收或发送信号的频率。会议台可以形成一组类似会议的一部分 分配相同通信信道的站。

    Unique word detection apparatus
    7.
    发明授权
    Unique word detection apparatus 失效
    独特的字检测装置

    公开(公告)号：US5206887A

    公开(公告)日：1993-04-27

    申请号：US591573

    申请日：1990-09-26

    申请人： Hiroki Tsuda ,  Hizuru Nawata

    发明人： Hiroki Tsuda ,  Hizuru Nawata

    IPC分类号： H04B7/212 ,  H04J3/06 ,  H04L7/08 ,  H04L27/22

    CPC分类号： H04B7/2125 ,  H04L7/08

    摘要： A unique word detection apparatus for detecting a unique word out of a demodulated signal resulting from the demodulation of a burst signal consisting of a carrier recovery section, a bit timing recovery section, a unique word section and a data section. The magnitude of the D.C. component of the demodulated signal is extracted, and the timing of the transition of this D.C. component from large to small is detected. An aperture signal designating the period in which to detect the unique word on the basis of the transition timing of the D.C. component generated, and the unique word out of the demodulated signal entered during the period designated by the aperture signal is accurately detected.

    Multiple accessing satellite communication system having standby central station
    8.
    发明授权
    Multiple accessing satellite communication system having standby central station 失效
    具有备用中心站的多址卫星通信系统

    公开(公告)号：US4947451A

    公开(公告)日：1990-08-07

    申请号：US314047

    申请日：1989-02-22

    申请人： Hizuru Nawata

    发明人： Hizuru Nawata

    IPC分类号： H04J3/00 ,  H04B7/185 ,  H04B7/212 ,  H04L1/22

    CPC分类号： H04B7/18523 ,  H04L1/22

    摘要： In a satellite communication system wherein a common channel is used for communication between a central station (10) and a plurality of remote stations (12) through a satellite transponder (11), in order to avoid system down due to fault of transmission of a broadcasting signal with a timing signal by the central station (10), the central station (10) comprises two portions (13, 14) positioned at different locations and a controller (15). When the first portion (13) detects fault of transmission of the broadcasting signal during the first portion (13) operates to communicate with the remote stations (12) under transmission of the broadcasting signal, the controller (15) is notified the fault and starts the second portion (14) in place of the first portion (13) so that the communication is maintained in the system without false. Those portions (13, 14) are assigned with ID numbers and can detect the fault by detecting operation of ID number. Each of remote stations (12) has timing offset data sets corresponding to the first and second portions (13, 14), selects one of the data sets by detection of the ID number in the broadcasting signal received, and determines a slot timing for transmitting a packet signal.

    Carrier recovery circuit for offset QPSK demodulators
    9.
    发明授权
    Carrier recovery circuit for offset QPSK demodulators 失效
    用于偏移QPSK解调器的载波恢复电路

    公开(公告)号：US4871975A

    公开(公告)日：1989-10-03

    申请号：US289617

    申请日：1988-12-23

    申请人： Hizuru Nawata ,  Susumu Otani

    发明人： Hizuru Nawata ,  Susumu Otani

    IPC分类号： H04L27/38 ,  H04L7/04 ,  H04L27/00 ,  H04L27/22 ,  H04L27/227

    CPC分类号： H04L27/2273 ,  H04L2027/0028 ,  H04L2027/0057 ,  H04L2027/0069 ,  H04L7/046

    摘要： A carrier recovery circuit comprises a voltage-controlled oscillator with a .pi./2 phase shifter coupled to it for generating carriers of quadrature phase relationship. First and second phase comparators respectively detect phase differences between an offset QPSK modulated signal and the carriers of the quadrature phase relationship. Signal from the first phase comparator is delayed by a 1/2 symbol duration and applied to one input of a quadri-phase detector having stable phase angles at .pi./4, (3/4).pi., (5/4).pi. and (7/4).pi. radian and signal from the second phase comparator is applied to the other input of the quadri-phase detector. A bit timing recovery field (1010 . . . 1010) of the second channel is detected from the output of the second phase comparator. Signal from the quadri-phase detector is applied to a loop filter and thence to the voltage-controlled oscillator during the time when a bit timing recovery field (BTR) of the second channel is not still detected. To stabilize the operation of the carrier recovery loop of the circuit, the output of the second phase comparator from which that BTR is detected is briefly applied to the loop filter in response to the detection of a BTR of the second channel, instead of the signal from the quadri-phase detector.

    Burst signal transmission from an earth station to an orbiting satellite with a short guard time
    10.
    发明授权
    Burst signal transmission from an earth station to an orbiting satellite with a short guard time 失效
    突发信号从地球站传输到具有短保护时间的轨道卫星

    公开(公告)号：US5991598A

    公开(公告)日：1999-11-23

    申请号：US907866

    申请日：1997-08-11

    申请人： Hizuru Nawata

    发明人： Hizuru Nawata

    IPC分类号： H04J3/00 ,  H04B7/185 ,  H04B7/204 ,  H04B7/212

    CPC分类号： H04B7/18532 ,  H04B7/2041 ,  H04B7/2125

    摘要： Radiated from each orbiting satellite of a satellite communication network to M cells (M representing an integer, such as thirty-seven) covered with a predetermined solid angle on the earth, M spot beams are identified by M identification codes. In an earth station which may be a portable unit, a burst signal transmitter device (31) comprises a receiver part (35) receiving one of the spot beams as a received beam at a reception time, to recognize as a recognized code one of the identification codes that identifies the received beam, and a transmitter part (45) for transmitting burst signals at a transmission time delayed from the reception time by an offset amount selected by the recognized code from M offset amounts predetermined for the identification codes. Preferably, the M offset amounts are stored in a memory (43).

    摘要翻译： 从卫星通信网络的每个轨道卫星辐射到以地球上预定立体角覆盖的M个小区（M代表一个整数，例如三十七个），M个点波束由M个识别码识别。 在可以是便携式单元的地球站中，突发信号发射机装置（31）包括：接收部分（35），在接收时间接收作为接收波束的点波束中的一个，以识别为识别码 用于识别接收到的波束的识别码;以及发射机部分（45），用于在从接收时间延迟的传输时间处以由所识别的码所选择的偏移量从针对识别码预定的M个偏移量发送突发信号。 优选地，M个偏移量存储在存储器（43）中。