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    Method and system for addressing and controlling a network of modems
    3.
    发明授权
    Method and system for addressing and controlling a network of modems 失效
    用于寻址和控制调制解调器网络的方法和系统

    公开(公告)号：US4761646A

    公开(公告)日：1988-08-02

    申请号：US864998

    申请日：1986-05-20

    申请人： Michel Choquet ,  James B. Staton, III ,  Kenneth R. Swartz

    发明人： Michel Choquet ,  James B. Staton, III ,  Kenneth R. Swartz

    IPC分类号： H04L12/26 ,  H04M11/06 ,  H04Q9/00 ,  H04J3/00

    CPC分类号： H04L43/50 ,  H04L12/2697 ,  H04M11/06

    摘要： A DTE can control the modems attached thereto by transmitting command messages over the data path and analyzing report messages supplied by the modems in return. Each command message is identified by a specific header. A command message intended for a remote modem (34) is intercepted by the local modem (30) and reformatted so as to obtain a supervisory message that is then transmitted at the rate of one bit per baud. A command message intended for a remote multichannel modem (48) is transmitted either by means of a supervisory message or in the data mode of operation. Messages are specifically addressed to individual modems by a special hierarchical address which utilizes information of the network link level on which the desired modem resides together with information as to which terminal (DTE), if any, the desired modem is attached. All locally attached primary modems are assigned an address comprising the link level designation and a first constant. All remotely attached primary modems are assigned an address comprising their link level designation and the first constant. All secondary modems are assigned an address comprising their link level designation and a second constant or, in the event they serve an attached terminal (DTE), the DTE address is used instead of the second constant.

    摘要翻译： DTE可以通过在数据路径上发送命令消息并分析调制解调器提供的报告消息来控制附加的调制解调器。 每个命令消息由特定头标识。 用于远程调制解调器（34）的命令消息被本地调制解调器（30）拦截并重新格式化，以便获得一个监控消息，然后以每个波特率一位的速率传输。 用于远程多信道调制解调器（48）的命令消息也可以通过监控消息或数据操作模式传输。 消息通过特殊分层地址专门针对各个调制解调器，该分层地址利用期望的调制解调器驻留的网络链路级的信息以及关于哪个终端（DTE）（如果有的话）所需的调制解调器被附接的信息。 所有本地连接的主调制解调器被分配包括链路级别指定和第一常数的地址。 所有远程连接的主调制解调器都被分配一个包括其链路级别指定和第一个常数的地址。 所有二次调制解调器被分配一个地址，包括其链路级别指定和第二个常数，或者在它们提供连接终端（DTE）的情况下，使用DTE地址而不是第二个常数。

    Channel equalization apparatus and method using the Fourier transform technique
    4.
    发明授权
    Channel equalization apparatus and method using the Fourier transform technique 失效
    使用傅立叶变换技术的信道均衡装置和方法

    公开(公告)号：US4152649A

    公开(公告)日：1979-05-01

    申请号：US808934

    申请日：1977-06-21

    申请人： Michel Choquet

    发明人： Michel Choquet

    IPC分类号： H03H15/00 ,  H03H19/00 ,  H04B3/06 ,  H04B3/10 ,  H04L25/03

    CPC分类号： H04L25/03038

    摘要： A method of and apparatus for determining during an initial training period the initial values of the coefficients of a transversal equalizer in a data transmission system in which the transmission channel creates frequency shift. The received periodic training sequence is modulated by a time-domain window signal whose Fourier transform exhibits a relatively flat central peak and has comparatively low values in the vicinity of those frequencies which are a multiple of the inverse of the period of the transmitted sequence, and the discrete Fourier transform W.sub.k of the modulated signal is computed. The values of the coefficients of the equalizer are obtained by computing the inverse discrete Fourier transform of the ratio F.sub.k =Z.sub.k /W.sub.k, where Z.sub.k is the discrete Fourier transform of the transmitted sequence.

    摘要翻译： 一种用于在初始训练周期期间确定传输信道产生频移的数据传输系统中的横向均衡器的系数的初始值的方法和装置。 接收到的周期性训练序列由时域窗口信号调制，其傅里叶变换表现出相对平坦的中心峰值，并且在那些频率附近具有相对较低的值，这些频率是发送序列的周期的倒数倍， 计算调制信号的离散付里叶变换Wk。 通过计算比值Fk = Zk / Wk的离散傅里叶逆变换得到均衡器的系数值，其中Zk是发射序列的离散傅立叶变换。