Patents by Inventor Yuichi Iwadate

Yuichi Iwadate 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).

  • Digital demodulator
    Patent number: 6813321
    Abstract: A digital demodulator which will need no absolute phasing circuit is provided.
    Type: Grant
    Filed: July 21, 2000
    Date of Patent: November 2, 2004
    Assignee: Kabushiki Kaisha Kenwood
    Inventors: Hisakazu Katoh, Akinori Hashimoto, Yuichi Iwadate, Kazuhiko Shibuya, Fumiaki Minematsu, Shigeyuki Itoh, Tomohiro Saito, Kenichi Shiraishi, Akihiro Horii, Shoji Matsuda, Soichi Shinjo
  • 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
  • Multiple sub-sampling transmitting/receiving system performing interfield and interframe offset sub-sampling of a broad bandwidth television signal
    Patent number: 5063445
    Abstract: A multiple sub-sampling encoding/decoding system performing interfield and interframe offset sub-sampling of a broad bandwidth television signal. The system compresses the television signal to fit, for example, to the transmission bandwidth of the standard television systems, compensates the transmission characteristics, and achieves the optimal frequency allocation of the modulated transmission signal.
    Type: Grant
    Filed: April 19, 1990
    Date of Patent: November 5, 1991
    Assignee: Nippon Hoso Kyokai
    Inventors: Taiji Nishizawa, Yutaka Tanaka, Seiichi Gohshi, Junji Kumada, Yuichi Iwadate, Kazuhiko Shibuya, Toshihiko Susaki, Yukihiro Nishida, Minoru Honda, Taiichiro Kurita, Yoshinori Izumi, Makoto Okui, Isao Kondo, Ryoichi Yajima, Jun'ichi Ishida
  • Decoding equalizer
    Patent number: 4949168
    Abstract: A decoding equalizer of high definition television signal transmission mode, such as MUSE, and a subrange-type A/D converter suitable for the equalizer. The decoding equalizer samples input data in equalization at a frequency twice the sampling frequency of the trunk system, with the equalizing A/D converter operating at a lower resolution and higher speed than the A/D converter for the trunk system. The subrange-type A/D converter includes A/D converters in multiple stages, with their driving clock frequencies having a specified relationship so that they are used commonly for the A/D conversdion of the high definition television signal and the A/D conversion of a test signal for detecting the transmission characteristics.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: August 14, 1990
    Assignee: Nippon Hoso Kyokai
    Inventors: Yuichi Ninomiya, Yuichi Iwadate