Patents by Inventor Naofumi Waku

Naofumi Waku 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).

  • Exponent encoder circuit and mask circuit
    Publication number: 20060212500
    Abstract: In order to provide an exponent encoder circuit for obtaining an exponent constituted by a left shift amount for normalizing input data with code bits, there is provided a first logic circuit for inverting data portions other than code bits and shifting the code bits to least significant bit positions when inputted data is a negative number and allowing data portions other than the code bits to pass as is and moving the code bits to least significant bit positions when the inputted data is a positive number, and a second logic circuit for putting a plurality of logic operation equations for obtaining each bit of an exponent from output of the first logic circuit as decided by a truth table for outputs of the first logic circuit and corresponding exponents in a form where common terms are cancelled out.
    Type: Application
    Filed: May 16, 2006
    Publication date: September 21, 2006
    Inventors: Mikio Fujita, Naofumi Waku
  • Exponent encoder circuit and mask circuit
    Patent number: 7096241
    Abstract: In order to provide an exponent encoder circuit for obtaining an exponent constituted by a left shift amount for normalizing input data with code bits, there is provided a first logic circuit for inverting data portions other than code bits and shifting the code bits to least significant bit positions when inputted data is a negative number and allowing data portions other than the code bits to pass as is and moving the code bits to least significant bit positions when the inputted data is a positive number, and a second logic circuit for putting a plurality of logic operation equations for obtaining each bit of an exponent from output of the first logic circuit as decided by a truth table for outputs of the first logic circuit and corresponding exponents in a form where common terms are cancelled out.
    Type: Grant
    Filed: May 23, 2002
    Date of Patent: August 22, 2006
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Mikio Fujita, Naofumi Waku
  • Exponent encoder circuit and mask circuit
    Publication number: 20030146860
    Abstract: In order to provide an exponent encoder circuit for obtaining an exponent constituted by a left shift amount for normalizing input data with code bits, there is provided a first logic circuit for inverting data portions other than code bits and shifting the code bits to least significant bit positions when inputted data is a negative number and allowing data portions other than the code bits to pass as is and moving the code bits to least significant bit positions when the inputted data is a positive number, and a second logic circuit for putting a plurality of logic operation equations for obtaining each bit of an exponent from output of the first logic circuit as decided by a truth table for outputs of the first logic circuit and corresponding exponents in a form where common terms are cancelled out.
    Type: Application
    Filed: May 23, 2002
    Publication date: August 7, 2003
    Inventors: Mikio Fujita, Naofumi Waku