利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

6 条记录 (耗时 0.01 秒)

    Time-division multiplex information transmission system having a variable structure
    1.
    发明授权
    Time-division multiplex information transmission system having a variable structure 失效
    具有可变结构的时分复用信息传输系统

    公开(公告)号：US5251217A

    公开(公告)日：1993-10-05

    申请号：US772811

    申请日：1991-10-04

    申请人： Jean-Francois Travers ,  Jacques Briand ,  Yvon Guedes

    发明人： Jean-Francois Travers ,  Jacques Briand ,  Yvon Guedes

    IPC分类号： H04B14/04 ,  H03M13/27 ,  H04J3/00 ,  H04J3/16 ,  H04J3/18 ,  H04L1/00 ,  H04Q3/52 ,  H04Q11/04 ,  H04J3/22

    CPC分类号： H04J3/1682 ,  H04J3/18

    摘要： A telecommunications system for information having a variable structure. The system uses at least one frequency channel for transmitting each second N.sub.T transmission packets to subscriber arrangements. These packets are formed by n.sub.t bits and are allocated to subscriber arrangements themselves producing 1/Ts information packets of n.sub.s bits per second. The system includes a time-division multiplex circuit (10) for multiplexing the information signals coming from subscriber arrangements (SPA1, CIA2, . . . , SPAm . . . ) and, alternatively, a demultiplex circuit (28) for distributing the time-division multiplex information signals to subscriber arrangements. Interleaving circuits are coupled to the multiplex circuit for inserting, into an allocated transmission packet, bits of different information packets allocated to the same subscriber arrangement. De-interleaving circuits coupled to the demultiplex circuit perform the reverse operation.

    摘要翻译： 用于具有可变结构的信息的电信系统。 该系统使用至少一个频率信道来将每个第二NT个传输分组传输到用户设备。 这些分组由nt个比特形成，分配给用户排列本身，产生每秒ns比特的1 / Ts个信息分组。 该系统包括用于多路复用来自用户装置（SPA1，CIA2，...，SPAm ...）的信息信号的时分多路复用电路（10），以及用于分配时分复用电路 将多路复用信息信号分配给用户安排。 交织电路耦合到多路复用电路，用于将分配给相同用户装置的不同信息包的比特分配到分配的传输分组中。 耦合到解复用电路的解交织电路执行反向操作。

    Multiplexed transmission system for subscriber units of different types
    2.
    发明授权
    Multiplexed transmission system for subscriber units of different types 失效
    用于不同类型的订户单位的多路传输系统

    公开(公告)号：US5231635A

    公开(公告)日：1993-07-27

    申请号：US772897

    申请日：1991-10-04

    申请人： Jean-Francois Travers ,  Jacques Briand ,  Yvon Guedes

    发明人： Jean-Francois Travers ,  Jacques Briand ,  Yvon Guedes

    IPC分类号： H04Q7/36 ,  H04B7/26 ,  H04J3/00

    CPC分类号： H04B7/2643

    摘要： A plurality of subscriber units are connected to at least two transceiver stations for exchanging information in a time division multiple access mode, in which traffic time intervals are allocated in rotation to a variable number C of channels, where C is dependent on the number and type of units to be connected. T intervals plus one control time interval form a frame, where T is mutually prime with respect to the numbers 2 through C.sub.MAX. M frames form a superframe, where M is the lowest common multiple of the numbers 1 through C.sub.MAX.

    摘要翻译： 多个用户单元连接到至少两个收发台，用于以时分多址模式交换信息，其中业务时间间隔被旋转分配到可变数目C的信道，其中C取决于数量和类型 的连接单位。 T间隔加上一个控制时间间隔形成一个帧，其中T相对于数字2到CMAX相互重合。 M帧形成超帧，其中M是数字1到CMAX的最低公倍数。

    Magnetic resonance signal acquisition methods
    5.
    发明授权
    Magnetic resonance signal acquisition methods 失效
    磁共振信号采集方法

    公开(公告)号：US5049820A

    公开(公告)日：1991-09-17

    申请号：US633184

    申请日：1990-12-28

    申请人： Jacques Briand ,  Laurance D. Hall

    发明人： Jacques Briand ,  Laurance D. Hall

    IPC分类号： G01R33/44 ,  A61B5/055 ,  G01R33/48 ,  G01R33/483

    CPC分类号： G01R33/4833

    摘要： A magnetic resonance signal of a volume of interest within an object is acquired by placing the object in a magnetic field and the application of three successive steps. The first step comprises an rf selective 90.degree. pulse of frequency f.sub.x applied in the presence of an x-gradient magnetic field to select a slice. The magnetization of the slice is then inverted. In the second step an rf selective 90.degree. pulse of frequency f.sub.y is applied in the presence of a y-gradient magnetic field to excite a strip of the slice, in the third step an rf selective 180.degree. pulse of frequency f.sub.z is applied in the presence of a y-gradient magnetic field to refocus the magnetization of a region of said strip. The resulting free induction signal is derived solely from said region.

    摘要翻译： 通过将物体放置在磁场中并且应用三个连续的步骤来获取物体内感兴趣体积的磁共振信号。 第一步包括在存在x梯度磁场的情况下施加频率fx的rf选择性90度脉冲以选择切片。 然后切片的磁化反转。 在第二步中，在存在y梯度磁场的情况下施加频率fy的rf选择性90°脉冲以激励切片的条带，在第三步中，将频率fz的rf选择性180°脉冲施加在 存在y梯度磁场以重新聚焦所述条带的区域的磁化。 所得到的自由感应信号仅来自所述区域。