Patents by Inventor Yasunori Oie

Yasunori Oie 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).

  • Quadrature amplitude modulation type digital radio communication device and method for preventing abnormal synchronization in demodulation system
    Patent number: 5438591
    Abstract: This invention relates to an abnormal synchronization preventing device used in a multiple value quadrature modulation type radio device and the abnormal synchronization preventing device includes a monitoring circuit for monitoring the carrier pull-out based on demodulated base band signals to output a carrier pull-out alarm signal, an abnormal synchronization detection circuit for sampling the reception signal level at a speed twice the transmission speed of reception data according to identification data and detecting abnormal synchronization according to whether or not the detection area of sampled data lies in a specified area, an abnormal synchronization preventing circuit for generating a signal for a preset period of time when abnormal synchronization is detected in a case where the carrier pull-out alarm signal is not output, and a selection circuit for receiving a reference signal used for generating a reference carrier frequency signal having a frequency close to the frequency of the carrier wave a
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: August 1, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasunori Oie, Mitsuru Hirama, Yasushi Fujii, Hidekazu Tanaka