Patents by Inventor Toshihiro Ashi

Toshihiro Ashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Bit synchronization circuit and central terminal for PON systems
    Patent number: 7239813
    Abstract: A bit synchronization circuit composed of a multiphase data sampling unit for converting each received burst data sets to multiphase data trains, a phase determination unit for generating a control signal indicating an optimum phase data train, an output data selector for selectively passing optimum phase data train indicated by the control signal, and a data synchronization unit for converting the optimum phase data train to a data train in synchronization with a reference clock. The phase determination unit repeatedly detecting the optimum phase data train during the same burst data set is received. When optimum phase varies, the output data selector dynamically switches the optimum phase data train to be supplied to the data synchronization unit.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: July 3, 2007
    Assignee: Hitachi Communication Technologies, Ltd.
    Inventors: Yusuke Yajima, Toshihiro Ashi, Tohru Kazawa
  • Bit synchronization circuit and central terminal for PON systems
    Publication number: 20040258410
    Abstract: A bit synchronization circuit composed of a multiphase data sampling unit for converting each received burst data sets to multiphase data trains, a phase determination unit for generating a control signal indicating an optimum phase data train, an output data selector for selectively passing optimum phase data train indicated by the control signal, and a data synchronization unit for converting the optimum phase data train to a data train in synchronization with a reference clock. The phase determination unit repeatedly detecting the optimum phase data train during the same burst data set is received. When optimum phase varies, the output data selector dynamically switches the optimum phase data train to be supplied to the data synchronization unit.
    Type: Application
    Filed: September 4, 2003
    Publication date: December 23, 2004
    Inventors: Yusuke Yajima, Toshihiro Ashi, Tohru Kazawa