Patents by Inventor Shinya Akashi

Shinya Akashi 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).

  • Adaptive digital filter with high speed and high precision coefficient sequence generation
    Patent number: 5781463
    Abstract: An adaptive digital filter includes a finite impulse response digital filter for performing a convolution calculation by multiplying a code sequence with a coefficient sequence, and a coefficient calculation unit for performing the updating calculation of the coefficient sequence only when the calculation result of the finite impulse response digital filter belongs to a predetermined numerical value region other than numerical value regions which are defined in advance in correspondence with code values of the code sequence. Thus, a coefficient sequence is generated at high speed and with high precision without making the calculation result of the coefficient sequence diverge even for a code sequence in which considerable intersymbol interference has occurred due to disturbance on the transmission path, and the intersymbol interference can be removed.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: July 14, 1998
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Tetsuya Ogawa, Naoki Kato, Shinya Akashi