Patents by Inventor Akinori Hashimoto

Akinori Hashimoto 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).

  • Transmitter and receiver
    Patent number: 6512759
    Abstract: An interleave frame is formed by combining slots corresponding to the same slot number in each frame when interleave process is performed in a super frame, and the data are read out along row or column direction (i.e. readout direction) and the data are written along the direction opposite to the readout direction in the same memory.
    Type: Grant
    Filed: August 4, 1999
    Date of Patent: January 28, 2003
    Assignee: Nippon Hoso Kyokai
    Inventors: Akinori Hashimoto, Hajime Matsumura, Junji Kumada, Hisakazu Katoh
  • AFC circuit, carrier recovery circuit and receiver device capable of regenerating a carrier reliably even at the time of low C/N ratio
    Patent number: 6490010
    Abstract: Stabilized carrier recovery is achieved even at the time of a low C/N ratio by measuring the phase of a signal and controlling VCO or NCO (Numerical Controlled Oscillator) using only a period having few constellation points. At this time, false lock phenomenon is avoided as follows. That is, relatively short SYNC modulated by an already-known pattern is entered into a modulation wave, VCO or NCO oscillation frequency is swept in a wide range and sweep is stopped at a frequency in which the SYNC can be received, thereby carrying out coarse control AFC. Further, a period having long to some extent, having few constellation points is provided in the modulation wave and then, a difference between the frequency of a received modulated signal and a local oscillation signal of VCO or NCO is obtained in this period.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: December 3, 2002
    Inventors: Kazuhiko Shibuya, Junji Kumada, Yuichi Iwadate, Hiroyuki Hamazumi, Toshihiro Nomoto, Kouichi Takano, Tomohiro Saito, Shoji Tanaka, Fumiaki Minematsu, Akinori Hashimoto, Shigeyuki Itoh, Hajime Matsumura, Hisakazu Katoh, Masaru Takechi