Patents by Inventor Katsumi Haji

Katsumi Haji 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).

  • Patent number: 4538176
    Abstract: A video/audio transmission system for sending video and audio information from video and audio files of a center to a subscriber through a subscriber's junction line is disclosed in which at least one subcenter having a video/audio buffer memory, an exchange and the like is disposed near to the subscriber to reduce the number of repeaters arranged on the subscribers junction line, and in which the video and audio information is transmitted from the center to the sub-center in a time division multiplex fashion to reduce the number of transmission lines between the center and the sub-center.
    Type: Grant
    Filed: November 26, 1979
    Date of Patent: August 27, 1985
    Assignees: Hitachi, Ltd., Nippon Telegraph & Telephone Public Corporation
    Inventors: Hirohito Nakajima, Katsumi Haji, Yoji Shibata, Wataru Kosuge
  • Patent number: 4295154
    Abstract: A digital video and audio file system is provided for use in systems such as a center-to-end video communication system. In the file system, video information, such as a color television video signal, is digitized in such a manner that it is separated into a luminance (Y) signal and a carrier chrominance (C) signal and these separated components are processed by the code differential method and the variable length encoding method. The digital signal thus digitized is recorded in a digital recorder. On the other hand, audio information is digitized by the AD-PCM encoding method and recorded in the same recorder. In encoding the video and the audio information, a part of hardware is used in common for both the signals, thus saving the hardware of the file system.
    Type: Grant
    Filed: August 3, 1979
    Date of Patent: October 13, 1981
    Assignees: Nippon Telegraph, Telephone Public Corp., Hitachi, Ltd.
    Inventors: Hidetoh Hata, Katsumi Haji, Kazushige Sako, Yoji Shibata, Masahiko Achiha