Patents by Inventor Hironori Orihara

Hironori Orihara 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).

  • Moden signal detecting system for adaptive differential PCM CODEC
    Patent number: 5202905
    Abstract: A modem signal detecting system for an adaptive differential code modulation system, which is intended for detecting a modem training signal, comprises a comparison and decision circuit which receives an input signal from a signal power calculator and compares a signal power level during a silent period and a training period of a modem training signal. The comparison and decision circuit then decides whether or not the transmission quality of the transmission line is suitable for the modem communication.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: April 13, 1993
    Assignee: Fujitsu Limited
    Inventors: Keizo Sakamoto, Yoshihiro Tomita, Hironori Orihara