Patents by Inventor Yuuichi Michikawa

Yuuichi Michikawa 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 magnetically recording coded digital video signals and an apparatus therefor
    Patent number: 4670797
    Abstract: An improved 8-8 mpping table system in digitally and magnetically recording video signals. Video signals coded into natural binary codes consisting of 8 bits are converted into different binary codes consisting of 8 bits constituted by patterns in which a continuous number of the 1's or the 0's does not exceed a predetermined number. In these codes, the continuous number of the 1's or the 0's is so limited that a maximum magnetization interval is reduced in magnetically recording the signals. Therefore, erroneous code is prevented from occurring in reproducing the signals.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: June 2, 1987
    Assignees: Hitachi, Ltd., Hitachi Denshi Kabushiki Kaisha
    Inventors: Masuo Umenoto, Seiichi Mita, Morishi Izumita, Yuuichi Michikawa, Morito Rokuda, Hitoshi Katayama, Hidehiro Kanada