Patents by Inventor Chihara Takahiro

Chihara Takahiro 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).

  • Demodulator for demodulating digital signal modulated by minimum shift keying and method therefor
    Patent number: 5170131
    Abstract: Disclosed is a demodulation circuit for demodulating a modulated signal obtained by minimum shift keying. The demodulation circuit includes two synchronous detection circuits for detecting the modulated signal synchronously with two signals having the phases different from each other by 90.degree., respectively, a circuit for discriminating the amplitude of the output signal of one of the synchronous detection circuits to convert the output signal into a rectangular wave having two logical levels, and a circuit for sampling the rectangular wave signal in synchronization with a clock signal having a frequency corresponding to one-bit duration of the digital data. Both of two signals having the phases different by 90.degree. from each other, all of which are necessary for the synchronous detection, and the clock signal are generated based on a signal (Vt (.theta.
    Type: Grant
    Filed: November 4, 1991
    Date of Patent: December 8, 1992
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Chihara Takahiro, Miyazaki Masao, Ohta Tomozo