Patents by Inventor Toshimichi Shiokawa

Toshimichi Shiokawa 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).

  • Receiving circuit
    Patent number: 5692017
    Abstract: A receiving circuit has an automatic level setting function for a background noise on the receiver side to generate a background noise free from incongruous aural sensation.
    Type: Grant
    Filed: July 20, 1995
    Date of Patent: November 25, 1997
    Assignee: NEC Corporation
    Inventor: Toshimichi Shiokawa
  • Arithmetic circuit for adaptive equalizer of LMS algorithm of reduced amount of operation
    Patent number: 5576983
    Abstract: An arithmetic circuit for adaptive equalizer of Least Mean Square (LMS) algorithm. Includes a real operation part computing a first product between a real part signal of a data sequence and a product of a real part signal of an error sequence and a step coefficient, and computing a second product between an imaginary part signal of the data sequence and a product of an imaginary part signal of the error sequence and a step coefficient. Either of the first and second products is negative. The real operation part further computes a real part of an adaptation coefficient from the first and second products.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: November 19, 1996
    Assignee: NEC Corporation
    Inventor: Toshimichi Shiokawa