Patents by Inventor Hirofumi Matoba

Hirofumi Matoba 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).

  • Video image mixing apparatus
    Patent number: 5636312
    Abstract: A video image mixing apparatus which can prevent a fluctuation of a mixed video image by a mixed video signal in the case where a playback video signal obtained by playing a recording medium in a special playing mode and a graphics video signal. When a discontinuity of the phase of a color burst signal in the playback video signal obtained by playing the recording medium is detected, the playback video signal and the graphics video signal are delayed by a predetermined time period and the delayed signals are mixed subsequently, thereby keeping the phases of chroma signals of the playback video signal and graphics video signal equal even in a special playing mode such as a still image reproducing mode or the like. In another embodiment, the mixed video signal of the playback video signal and graphics video signal is delayed by a predetermined time and is generated.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: June 3, 1997
    Assignee: Pioneer Electronic Corporation
    Inventors: Manabu Okamoto, Takashi Yoshimi, Hiroyasu Matsuura, Noriyoshi Takeya, Hitoshi Yamazaki, Masakazu Miyazaki, Hirofumi Matoba
  • Apparatus for mixing video signals having different numbers of lines
    Patent number: 5434676
    Abstract: A video signal mixing apparatus for mixing a playback composite video signal produced by playing a recording medium and a graphics composite video signal generated on the basis of video data read from a memory device, wherein a vertical synchronizing signal of the playback composite video signal is forcedly generated in response to a vertical synchronizing signal of the graphics composite video signal to make the number of horizontal scanning lines of the playback composite video signal coincident with the number of horizontal scanning lines of the graphics composite video signal.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: July 18, 1995
    Assignee: Pioneer Electronic Corporation
    Inventors: Manabu Okamoto, Takashi Yoshimi, Hiroyasu Matsuura, Noriyoshi Takeya, Hitoshi Yamazaki, Masakazu Miyazaki, Hirofumi Matoba
  • Video mixing apparatus capable of combining two input signals and varying the mixing ratio line by line
    Patent number: 5355175
    Abstract: A video mixing apparatus mixes a graphics video image and a playback video image at a plurality of mixture ratios in one image plane. Fade data indicative of the mixing ratio of at least one line of the playback video signal and the graphics video signal is sequentially generated in accordance with a predetermined order. The fade data is held into holding means and is outputted from the holding means synchronously with a horizontal sync signal. The levels of the playback video signal and the graphics video signal are individually adjusted in accordance with the fade data outputted from the holding means and the adjusted signals are added. The playback video signal and the graphics video signal are mixed at the mixing ratio set every line of one image plane.
    Type: Grant
    Filed: June 2, 1993
    Date of Patent: October 11, 1994
    Assignees: Hudson Soft Co., Ltd, Pioneer Electronic Corp.
    Inventors: Setsuo Okada, Noriyoshi Takeya, Manabu Okamoto, Yoshinobu Nagase, Takashi Yoshimi, Hitoshi Yamazaki, Hiroyasu Matsuura, Masakazu Miyazaki, Yoshiki Furuta, Masahiro Sui, Hirofumi Matoba