Patents by Inventor Masahiko Mutoh

Masahiko Mutoh 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).

  • Apparatus and a method for calculation of a correlation value corresponding to a frequency error, and a recording medium with a recorded correlation value calculation program
    Patent number: 7356101
    Abstract: An apparatus for calculation of correlation that can take a correlation even when a frequency error is relatively large. With a 0-th degree correlator for taking, to output, a correlation between a reference signal and a measurement signal, an n-th degree correlator including an ejwt multiplier for calculating a frequency component addition signal having a frequency component added to the reference signal, and a correlation calculator for taking, to output, a correlation between the frequency component addition signal and the measurement signal, and an adder for adding an output of the 0-th degree correlator and an output of the n-th degree correlator, it is achieved that the output of the 0-th degree correlator and the output of the n-th degree correlator added at the adder do not have an increased noise/correlation value ratio, even when a frequency error is large. Accordingly, a correlation can be taken even with an increased frequency error.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: April 8, 2008
    Assignee: ADVANTEST Corporation
    Inventor: Masahiko Mutoh
  • Apparatus and a method for calculation of a correlation value corresponding to a frequency error, and a recording medium with a recorded correlation value calculation program
    Patent number: 7058143
    Abstract: To provide an apparatus for calculation of correlation that can take a correlation even when a frequency error is relatively large. With a 0-th degree correlator for taking, to output, a correlation between a reference signal and a measurement signal, an n-th degree correlator including an ejwt multiplier of calculating a frequency component addition signal having a frequency component added to the reference signal, and a correlation calculator for taking, to output, a correlation between the frequency component addition signal and the measurement signal, and an adder for adding an output of the 0-th degree correlator and an output of the n-th degree correlator and the output of the n-th degree correlator added at the adder do not have an increased noise/correlation value ratio, even when a frequency error is large. Accordingly, a correlation can be taken even with an increased frequency error. Another embodiment includes a conceptual block diagram in which a symbol D(o) is multiplied by a frequency.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: June 6, 2006
    Assignee: Advantest Corporation
    Inventor: Masahiko Mutoh
  • Apparatus and a method for calculation of a correlation value corresponding to a frequency error, and a recording medium with a recorded correlation value calculation program
    Patent number: 6807242
    Abstract: To provide an apparatus for calculation of correlation that can take in correlation even when a frequency error is relatively large. With a 0-th degree correlator for taking, to output, a correlation between a reference signal and a measurement signal, an n-th degree correlator including an ej&ohgr;t multiplier for calculating a frequency component addition signal having a frequency component added to the reference signal, and a correlation calculator for taking, to output, a correlation between the frequency component addition signal and the measurement signal, and an adder for adding an output of the 0-th degree correlator and an output of the n-th degree correlator, it is achieved that the output of the 0-th degree correlator and the output of the n-th degree correlator added at the adder do not have an increased noise/correlation value ratio, even when a frequency error is large. Accordingly, a correlation can be taken even with an increased frequency error.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: October 19, 2004
    Assignee: Advantest Corporation
    Inventor: Masahiko Mutoh
  • Apparatus and a method for calculation of a correlation value corresponding to a frequency error, and a recording medium with a recorded correlation value calculation program
    Publication number: 20040184608
    Abstract: To provide an apparatus for calculation of correlation that can take a correlation even when a frequency error is relatively large.
    Type: Application
    Filed: January 21, 2004
    Publication date: September 23, 2004
    Applicant: ADVANTEST CORPORATION
    Inventor: Masahiko Mutoh
  • Apparatus and a method for calculation of a correlation Value corresponding to a frequency error, and a recording medium with a recorded correlation value calculation program
    Publication number: 20040153893
    Abstract: [Object] To provide an apparatus for calculation of correlation that can take a correlation even when a frequency error is relatively large.
    Type: Application
    Filed: January 21, 2004
    Publication date: August 5, 2004
    Applicant: ADVANTEST CORPORATION
    Inventor: Masahiko Mutoh