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    • 5. 发明授权
    • Communication system including several communication terminals and server, its communication terminal, its server and data transfer control program
    • 通信系统包括几个通信终端和服务器,其通信终端,其服务器和数据传输控制程序
    • US07646789B2
    • 2010-01-12
    • US10352114
    • 2003-01-28
    • Masaki UmayabashiSatomi ShioiriKazuo TakagiMakoto Shibutani
    • Masaki UmayabashiSatomi ShioiriKazuo TakagiMakoto Shibutani
    • H04J3/16
    • H04L25/4908H04L7/041H04L7/046H04L12/2856H04L12/2885H04L12/413H04Q11/0067
    • In a communication system in which a plurality of communication terminals sequentially transfer data to a server during the respective transmission permissible periods assigned to the respective communication terminals, the communication terminal transfers a preamble for synchronization to the server at a time of starting the transmission permissible period, converts a data frame for every 8 bits into every 10 bit-code, and transmits to the server, the signal string with a code indicating the head added there, during the transmission permissible period, and turns a communication to the server into a zero signal state, during a period other than the transmission permissible period, while the server establishes a synchronization by reading the preamble for synchronization inserted into the signal string received from each of the communication terminals, converts a portion of the zero signal state of the signal string into a predetermined special code string, and inversely transforms the received signal string into the data frame before the coding.
    • 在其中多个通信终端在分配给各个通信终端的各个传输允许期间内顺序地将数据传送到服务器的通信系统中,通信终端在启动传输允许周期时将服务器前同步码传送到服务器 将每8位的数据帧转换为每10位代码,并在发送允许期间向服务器发送具有指示添加到其中的头的代码的信号串,并将与服务器的通信转换为零 信号状态,在传输允许期间以外的时段期间,当服务器通过读取插入到从每个通信终端接收的信号串中的同步的前同步码来建立同步时,转换信号串的零信号状态的一部分 成为预定的特殊代码串,并反向转换 在编码之前将数据帧接收到数据帧中。
    • 9. 发明授权
    • Packet filter-based clock synchronization system, apparatus, and method, and program thereof
    • 基于分组滤波器的时钟同步系统,装置和方法及其程序
    • US08731036B2
    • 2014-05-20
    • US13129755
    • 2009-11-20
    • Masaki UmayabashiZhenlong CuiKazuo Takagi
    • Masaki UmayabashiZhenlong CuiKazuo Takagi
    • H04L7/00
    • H04J3/0664H03L7/08H04J3/0632
    • A clock synchronization system synchronizes a clock of a slave node with a clock of a master node. The master node includes a packet transmitting unit that transmits a packet including a time stamp (TS) to the slave node. The slave node includes: a packet receiving unit that receives the packet transmitted from the master node; a packet filter unit that calculates as a value of delay of the packet a difference between a TS on the clock of the slave node when the packet is received and the TS of the packet received, corrects the value of the delay of the packet or a threthold for the delay of the packet, and performs filter processing on the packet received from the packet receiving unit based on the value of the delay of the packet and the threshold for the delay of the packet; and a phase synchronization unit that outputs the clock of the slave node based on the TS included in the packet employed.
    • 时钟同步系统将从节点的时钟与主节点的时钟同步。 主节点包括分组发送单元,该分组发送单元将包括时间戳(TS)的分组发送到从节点。 从节点包括:分组接收单元,接收从主节点发送的分组; 分组过滤器单元,当分组接收到从属节点的时钟上的TS与接收到的分组的TS之间的时间差时,计算分组的延迟值,校正分组的延迟的值或 考虑到分组的延迟,并且基于分组的延迟的值和分组的延迟的阈值对从分组接收单元接收的分组执行滤波处理; 以及相位同步单元,其基于包含在所使用的分组中的TS输出从节点的时钟。