Patents by Inventor Fujio Okamura

Fujio Okamura 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).

  • Compression and coding device for video signals
    Patent number: 4907081
    Abstract: A coding device in which N digital signals (time-sequential sampled data), obtained by sampling and quantizing analog video signals, are brought together in one group (N being an integer greater than two) and coded. Among these N sampled data, at least one of them serving as a reference is coded with a number of quantization bits n, which is so great that errors due to the quantization can be neglected, and for the other sampled data the difference between the reference sampled data and each of the others is compressed and coded with a number of bits, which is smaller than n. In this way, even if a coding error is produced; effects thereof are restricted within the gorup where it is produced they are not exerted on the other groups, and thus error propagation does not occur.
    Type: Grant
    Filed: April 22, 1988
    Date of Patent: March 6, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Fujio Okamura, Keizo Nishimura, Shigemitsu Higuchi, Takashi Furuhata
  • Rotary head type magnetic recording and reproducing apparatus and method of producing tracking control signals therefor
    Patent number: 4843493
    Abstract: A method of producing a tracking control signal in a rotary head type magnetic recording and reproducing apparatus and a rotary head type magnetic recording and reproducing apparatus capable of a proper tracking by the use of the tracking control signal.
    Type: Grant
    Filed: March 12, 1986
    Date of Patent: June 27, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Furuhata, Yasufumi Yumde, Fujio Okamura, Takaharu Noguchi, Toshifumi Shibuya, Katsuo Mohri, Takao Arai, Toshimichi Terada