Patents by Inventor Hidemi Kuroda

Hidemi Kuroda 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).

  • Method for automatically equalizing the delay characteristics of a transmission line
    Patent number: 4140983
    Abstract: In a delay equalizer having a plurality of quadratic all pass networks for equalizing the delay characteristics of a circuit, the automatic adjustment of the value of Q of each quadratic all pass network when calculated through the asymptotic formula ##EQU1## CAN PROVIDE PERFECT DELAY EQUALIZATION, WHERE Q.sub.i.sup.k is the value of Q of the i'th quadratic all pass network, and .alpha..sub.i is the step size parameter of i'th quadratic all pass network. Before applying said formula, the delay of the circuit to be equalized at the center frequency of each quadratic all pass network is measured, and said formula is calculated according to the result of the measurement.
    Type: Grant
    Filed: June 21, 1977
    Date of Patent: February 20, 1979
    Assignee: Kokusai Denshin Denwa Co., Ltd.
    Inventors: Michitoshi Tamori, Hidemi Kuroda
  • Automatic equalizer having a coefficient matrix circuit
    Patent number: 4064397
    Abstract: In an automatic equalizer for regenerating a received digital signal, comprising a delay element train with a plurality of taps, a coefficient matrix circuit and a group of variable coefficient units, the structure of said coefficient matrix circuit being considerably simplified by introducing a simple adder and/or subtractor at the input and/or the output of said coefficient matrix circuit.
    Type: Grant
    Filed: June 24, 1976
    Date of Patent: December 20, 1977
    Assignee: Kokusai Denshin Denwa Co. Ltd.
    Inventors: Hiroshi Sakaki, Sotokichi Shintani, Hidemi Kuroda