Patents by Inventor Norio Sumi

Norio Sumi 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).

  • Semiconductor operation device with memory for storing operation codes connected from coefficients prior to performing an operation on an input signal
    Patent number: 5235538
    Abstract: The present invention features performance of operation processing between a signal obtained by converting a coefficient into a Booth code with a Booth encoder, storing the Booth code in a memory device in advance and reading out the stored Booth code for processing an input signal in a semiconductor operation device or a digital filter. As a result, a coding operation by a Booth encoder of the present invention will be performed only once at the time of rewriting a coefficient and will not be repeated, thereby enabling a high-speed operation and realizing reduction of circuit scale at the same time by using an encoded Booth code directly in an operation after a coefficient has been determined.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: August 10, 1993
    Assignees: Hitachi, Ltd., Hitachi Device Engineering Co., Ltd.
    Inventors: Norio Sumi, Hirotsugu Kojima, Junko Nakase