Patents by Inventor Kenji Ueoka

Kenji Ueoka 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).

  • Digital type VSB modulation apparatus
    Patent number: 5327462
    Abstract: In this invention, in order to generate a VSB modulation signal from a digital baseband signal, an in-phase component of a modulation signal having a frequency spectrum having a high-frequency component whose level is half that of its low-frequency component, and an orthogonal component of the modulation signal of a high-frequency component having a frequency spectrum whose level is half that of the low-frequency component are generated from the baseband signal. The in-phase component and the orthogonal component are multiplied with carrier signals to obtain a carrier in-phase component and a carrier orthogonal component. The carrier in-phase component and the carrier orthogonal component are synthesized to obtain a VSB modulation signal.
    Type: Grant
    Filed: February 7, 1992
    Date of Patent: July 5, 1994
    Assignees: Kabushiki Kaisha Toshiba, Nippon Hoso Kyokai
    Inventors: Yasuo Takahashi, Tatsuya Ishikawa, Toshio Aoki, Nobuyuki Miki, Masatoshi Hamada, Masatoshi Hamada, Yasuhiro Hashimoto, Kenji Ueoka, Nobuhiko Kawai