Patents by Inventor Hirobumi Musha

Hirobumi Musha 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).

  • Measuring apparatus and measuring method
    Patent number: 7636387
    Abstract: A measuring apparatus including a timing jitter estimator which estimates an output timing jitter sequence which indicates the output timing jitter of an output signal based on an output signal output from a DUT in response to an input signal input to the DUT, and a jitter transfer function estimator which estimates a jitter transfer function in the DUT based on the output timing jitter sequence. The jitter transfer function estimator includes an instantaneous phase noise estimator which estimates an instant phase noise of the output signal based on an output signal, and a resampler which generates the output timing jitter sequence by resampling the instantaneous phase noise at predetermined timing.
    Type: Grant
    Filed: February 11, 2004
    Date of Patent: December 22, 2009
    Assignee: Advantest Corporation
    Inventors: Takahiro Yamaguchi, Masahiro Ishida, Mani Soma, Hirobumi Musha
  • Measuring apparatus and measuring method
    Patent number: 7054358
    Abstract: A measuring apparatus is provided that includes: a timing jitter calculator for calculating the first timing jitter sequence of the first signal and the second timing jitter sequence of the second signal; and a jitter transfer function estimator for calculating a jitter transfer function between the first and second signals based on frequency components of the first and second timing jitter sequences. The jitter transfer function estimator calculates the jitter transfer function, for a plurality of frequency component pairs each of which is formed by a frequency component of a timing jitter in the first timing jitter sequence and a frequency component of a timing jitter in the second timing jitter sequence which correspond to approximately equal frequencies, based on frequency component ratios of the timing jitters in the first and second timing jitter sequences.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: May 30, 2006
    Assignee: Advantest Corporation
    Inventors: Takahiro Yamaguchi, Masahiro Ishida, Hirobumi Musha, Mani Soma
  • Measuring apparatus and measuring method
    Publication number: 20050031029
    Abstract: A measuring apparatus including a timing jitter estimator which estimates an output timing jitter sequence which indicates the output timing jitter of an output signal based on an output signal output from a DUT in response to an input signal input to the DUT, and a jitter transfer function estimator which estimates a jitter transfer function in the DUT based on the output timing jitter sequence. The jitter transfer function estimator includes an instantaneous phase noise estimator which estimates an instant phase noise of the output signal based on an output signal, and a resampler which generates the output timing jitter sequence by resampling the instantaneous phase noise at predetermined timing.
    Type: Application
    Filed: February 11, 2004
    Publication date: February 10, 2005
    Inventors: Takahiro Yamaguchi, Masahiro Ishida, Mani Soma, Hirobumi Musha
  • Measuring apparatus and measuring method
    Publication number: 20030202573
    Abstract: A measuring apparatus is provided that includes: a timing jitter calculator for calculating the first timing jitter sequence of the first signal and the second timing jitter sequence of the second signal; and a jitter transfer function estimator for calculating a jitter transfer function between the first and second signals based on frequency components of the first and second timing jitter sequences. The jitter transfer function estimator calculates the jitter transfer function, for a plurality of frequency component pairs each of which is formed by a frequency component of a timing jitter in the first timing jitter sequence and a frequency component of a timing jitter in the second timing jitter sequence which correspond to approximately equal frequencies, based on frequency component ratios of the timing jitters in the first and second timing jitter sequences.
    Type: Application
    Filed: April 29, 2002
    Publication date: October 30, 2003
    Inventors: Takahiro Yamaguchi, Masahiro Ishida, Hirobumi Musha, Mani Soma
  • Frequency spectrum analyzer with high C/N ratio
    Patent number: 6265861
    Abstract: A frequency spectrum analyzer having an improved carrier to noise ration for analyzing frequency spectrum of an input signal.
    Type: Grant
    Filed: January 13, 2000
    Date of Patent: July 24, 2001
    Assignee: Advantest Corp.
    Inventor: Hirobumi Musha
  • Frequency spectrum analyzer with high C/N ratio
    Patent number: 6166533
    Abstract: A frequency spectrum analyzer having an improved carrier to noise ration for analyzing frequency spectrum of an input signal.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: December 26, 2000
    Assignee: Advantest Corp
    Inventor: Hirobumi Musha