Patents by Inventor Ryuichi Todoroki

Ryuichi Todoroki 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).

  • Method of and system for controlling brightness of plasma display panel
    Patent number: 6597333
    Abstract: A method of and a system for controlling a brightness of a picture displayed on a plasma display panel are provided which are capable of determining whether a video signal to be fed to the plasma display panel is a signal indicating a stationary picture, reducing the brightness of a picture displayed on the plasma display panel if it is determined that a video signal to be fed to the plasma display panel is a signal indicating a stationary picture.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: July 22, 2003
    Assignee: Pioneer Electronic Corporation
    Inventors: Ryuichi Todoroki, Naruhiro Sato, Nozomu Kikuchi, Kenichiro Hosoi
  • METHOD OF AND SYSTEM FOR CONTROLLING BRIGHTNESS OF PLASMA DISPLAY PANEL
    Publication number: 20020167469
    Abstract: A method of and a system for controlling a brightness of a picture displayed on a plasma display panel are provided which are capable of determining whether a video signal to be fed to the plasma display panel is a signal indicating a stationary picture, reducing the brightness of a picture displayed on the plasma display panel if it is determined that a video signal to be fed to the plasma display panel is a signal indicating a stationary picture.
    Type: Application
    Filed: June 10, 1999
    Publication date: November 14, 2002
    Inventors: RYUICHI TODOROKI, NARUHIRO SATO, NOZOMU KIKUCHI, KENICHIRO HOSOI
  • Method of recording and reproducing information on a video disk utilizing table of contents data
    Patent number: 5351132
    Abstract: A method of recording information on a video disk, includes the steps of: recording a video signal on the video disk; and recording table-of-contents data to control reproduction of the recorded video signal, on a plurality of frames in a lead-in area of the video disk. The table-of-contents data has a data structure, which is completed in each of the plurality of frames and is repeatedly identical in each of the plurality of frames adjacent to each other.
    Type: Grant
    Filed: September 9, 1992
    Date of Patent: September 27, 1994
    Assignee: Pioneer Electronic Corporation
    Inventors: Takao Sawabe, Ryuichi Todoroki, Takashi Sakakibara
  • Method for developing a key signal for descrambling in television broadcasting
    Patent number: 4794643
    Abstract: A scrambling method for TV pictures avoids deterioration of the reproduced picture by level compressing only selected horizontal flyback portions according to a randomly selected pattern to prevent synchronization at the receiver. Key signals are added repetitively to a plurality of horizontal synch signals in one frame so as to enable descrambling of the picture at the decoder, even if noise or data error interferes with one or more of the signals.
    Type: Grant
    Filed: June 30, 1983
    Date of Patent: December 27, 1988
    Assignee: Pioneer Electronic Corporation
    Inventors: Yoshifumi Saeki, Shigeru Watanabe, Ryuichi Todoroki