Patents by Inventor Takashi Tsuwa

Takashi Tsuwa 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).

  • Demodulation circuit of differential phase shift keying (DPSK) modulated signals
    Patent number: 8249198
    Abstract: A demodulation circuit demodulates a differential phase shift keying (DPSK) modulated received signal. A phase difference data generator compares phase data representing a phase of the received signal input at every predetermined sampling time with previous phase data preceding by one symbol time to generate phase difference data representing a phase shift amount of the phase data. A symbol selection unit evaluates the phase difference data generated at every sampling time to select as a symbol.
    Type: Grant
    Filed: February 6, 2009
    Date of Patent: August 21, 2012
    Assignee: Rohm Co., Ltd.
    Inventor: Takashi Tsuwa
  • DEMODULATION CIRCUIT OF DIFFERENTIAL PHASE SHIFT KEYING (DPSK) MODULATED SIGNALS
    Publication number: 20090196376
    Abstract: A demodulation circuit demodulates a differential phase shift keying (DPSK) modulated received signal. A phase difference data generator compares phase data representing a phase of the received signal input at every predetermined sampling time with previous phase data preceding by one symbol time to generate phase difference data representing a phase shift amount of the phase data. A symbol selection unit evaluates the phase difference data generated at every sampling time to select as a symbol.
    Type: Application
    Filed: February 6, 2009
    Publication date: August 6, 2009
    Applicant: ROHM CO., LTD.
    Inventor: Takashi Tsuwa