Patents by Inventor Masaru FUJIEDA

Masaru FUJIEDA 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).

  • Patent number: 10320967
    Abstract: The signal processing device comprises the adaptive gain calculation unit configured to calculate and output the adaptive gain for processing the voice reception output signal, by utilizing at least the voice transmission input signal and the relative volume value indicating the predetermined relative sound volume ratio between the voice transmission input signal and the voice reception output signal; and the multiplication unit configured to calculate the voice reception output signal by multiplying the signal based on the voice reception input signal by the value based on the adaptive gain.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: June 11, 2019
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Masaru Fujieda
  • Publication number: 20180077278
    Abstract: The signal processing device comprises the adaptive gain calculation unit configured to calculate and output the adaptive gain for processing the voice reception output signal, by utilizing at least the voice transmission input signal and the relative volume value indicating the predetermined relative sound volume ratio between the voice transmission input signal and the voice reception output signal; and the multiplication unit configured to calculate the voice reception output signal by multiplying the signal based on the voice reception input signal by the value based on the adaptive gain.
    Type: Application
    Filed: June 8, 2017
    Publication date: March 15, 2018
    Applicant: Oki Electric Industry Co., Ltd.
    Inventor: Masaru FUJIEDA
  • Patent number: 9779762
    Abstract: An object sound period detection apparatus includes a first calculating unit, a second calculating unit, a first detecting unit, and a second detecting unit. The first calculating unit calculates a first threshold every unit time. The second calculating unit calculates a second threshold every unit time. The first detecting unit compares first feature amount based on the input signal with the first threshold and detects the object sound period in the input signal. The second detecting unit compares second feature amount based on the input signal with the second threshold, detects the object sound period in the input signal, and outputs a detecting result. The first calculating unit calculates the first threshold based on a detecting result before unit time by the second detecting unit. The second calculating unit calculates the second threshold based on a detecting result in same unit time by the first detecting unit.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: October 3, 2017
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Masaru Fujieda
  • Patent number: 9734835
    Abstract: A voice decoding apparatus includes an MBE-type decoder, a sampling convertor, a non-linear components generator and an adder. The decoder decodes digital voice-encoded information to generate a first decoded voice signal. The convertor converts the first decoded voice signal to a second decoded voice signal with a higher sampling frequency. The generator performs a non-linear process to the first or second decoded voice signal to generate an additional voice signal with the same sampling frequency as the second decoded voice signal. The additional voice signal has components in a frequency band in which the first decoded voice signal has no component and continuing to another frequency band of the first decoded voice signal. The adder adds the second decoded voice signal to the additional voice signal.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: August 15, 2017
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Masaru Fujieda
  • Patent number: 9548064
    Abstract: A noise estimation apparatus of estimating a noise in an input signal includes a sub-band noise estimator estimating a noise in a sub-band input signal, obtained by dividing the input signal by sub-bands. The sub-band noise estimator includes a power calculator calculating a sub-band input power of the sub-band input signal; a probability model holder holding information on probability model; and an a posteriori probability maximizer calculating an instantaneous estimated value of a sub-band noise power based on the sub-band input power, an estimated value of the sub-band noise power and the information on the probability model, so as to maximize a posteriori probability of the sub-band noise power. The information on the probability model includes a likelihood function regarding a posteriori signal-to-noise ratio (SNR) in dependence upon predictive a posteriori SNR; and a priori probability of the a posteriori SNR under a condition establishing averaged a posteriori SNR.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: January 17, 2017
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Masaru Fujieda
  • Patent number: 9418677
    Abstract: There is provided a noise suppressing device for suppress a noise component included in an input signal. The noise suppressing device comprises: a noise estimating unit configured to estimate a noise spectrum based on an input spectrum obtained by performing a frequency analysis on the input signal; a speech-likelihood calculating unit configured to calculate speech-likelihood based on the input spectrum and the noise spectrum; a suppression-gain calculating unit configured to calculate first suppression gain based on the input spectrum and the noise spectrum; a suppression-gain combining unit configured to calculate third suppression gain by combining the first suppression gain and second suppression gain, which is provided as a predetermined constant value or provided by smoothing the first suppression gain, based on the speech-likelihood; and a multiplying unit obtaining an output spectrum by multiplying the input spectrum by the third suppression gain.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: August 16, 2016
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Masaru Fujieda
  • Publication number: 20160232916
    Abstract: An object sound period detection apparatus includes a first calculating unit, a second calculating unit, a first detecting unit, and a second detecting unit. The first calculating unit calculates a first threshold every unit time. The second calculating unit calculates a second threshold every unit time. The first detecting unit compares first feature amount based on the input signal with the first threshold and detects the object sound period in the input signal. The second detecting unit compares second feature amount based on the input signal with the second threshold, detects the object sound period in the input signal, and outputs a detecting result. The first calculating unit calculates the first threshold based on a detecting result before unit time by the second detecting unit. The second calculating unit calculates the second threshold based on a detecting result in same unit time by the first detecting unit.
    Type: Application
    Filed: January 29, 2016
    Publication date: August 11, 2016
    Applicant: Oki Electric Industry Co., Ltd.
    Inventor: Masaru FUJIEDA
  • Publication number: 20160042746
    Abstract: There is provided a noise suppressing device for suppress a noise component included in an input signal. The noise suppressing device comprises: a noise estimating unit configured to estimate a noise spectrum based on an input spectrum obtained by performing a frequency analysis on the input signal; a speech-likelihood calculating unit configured to calculate speech-likelihood based on the input spectrum and the noise spectrum; a suppression-gain calculating unit configured to calculate first suppression gain based on the input spectrum and the noise spectrum; a suppression-gain combining unit configured to calculate third suppression gain by combining the first suppression gain and second suppression gain, which is provided as a predetermined constant value or provided by smoothing the first suppression gain, based on the speech-likelihood; and a multiplying unit obtaining an output spectrum by multiplying the input spectrum by the third suppression gain.
    Type: Application
    Filed: July 1, 2015
    Publication date: February 11, 2016
    Applicant: Oki Electric Industry Co., Ltd.
    Inventor: Masaru FUJIEDA
  • Publication number: 20150262584
    Abstract: A voice decoding apparatus includes an MBE-type decoder, a sampling convertor, a non-linear components generator and an adder. The decoder decodes digital voice-encoded information to generate a first decoded voice signal. The convertor converts the first decoded voice signal to a second decoded voice signal with a higher sampling frequency. The generator performs a non-linear process to the first or second decoded voice signal to generate an additional voice signal with the same sampling frequency as the second decoded voice signal. The additional voice signal has components in a frequency band in which the first decoded voice signal has no component and continuing to another frequency band of the first decoded voice signal. The adder adds the second decoded voice signal to the additional voice signal.
    Type: Application
    Filed: February 5, 2015
    Publication date: September 17, 2015
    Applicant: OKI ELECTRIC INDUSTRY CO., LTD.
    Inventor: Masaru FUJIEDA
  • Publication number: 20150230023
    Abstract: A noise estimation apparatus of estimating a noise in an input signal includes a sub-band noise estimator estimating a noise in a sub-band input signal, obtained by dividing the input signal by sub-bands. The sub-band noise estimator includes a power calculator calculating a sub-band input power of the sub-band input signal; a probability model holder holding information on probability model; and an a posteriori probability maximizer calculating an instantaneous estimated value of a sub-band noise power based on the sub-band input power, an estimated value of the sub-band noise power and the information on the probability model, so as to maximize a posteriori probability of the sub-band noise power. The information on the probability model includes a likelihood function regarding a posteriori signal-to-noise ratio (SNR) in dependence upon predictive a posteriori SNR; and a priori probability of the a posteriori SNR under a condition establishing averaged a posteriori SNR.
    Type: Application
    Filed: February 5, 2015
    Publication date: August 13, 2015
    Applicant: OKI ELECTRIC INDUSTRY CO., LTD.
    Inventor: Masaru FUJIEDA
  • Publication number: 20140088959
    Abstract: A band extension apparatus is provided. The band extension apparatus extends a narrow-band speech signal whose frequency band has been restricted to an arbitrary input band, such that the extension band includes signal components in an arbitrary extension band. The arbitrary extension band is a frequency band outside the input band.
    Type: Application
    Filed: July 19, 2013
    Publication date: March 27, 2014
    Applicant: Oki Electric Industry Co., Ltd.
    Inventor: Masaru FUJIEDA