Patents by Inventor Masanori Tsujikawa

Masanori Tsujikawa 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).

  • Publication number: 20220313132
    Abstract: An alertness estimation apparatus 10, includes: an image extraction unit 11 that extracts an image of a portion including eyes from an image data of a face image of a human; a first alertness estimation unit 12 that estimates a first alertness based on the extracted image; a pulse wave detection unit 13 that determines whether or not the estimated first alertness satisfies a set condition, and detect a pulse wave of the human from the face image, when the first alertness satisfies the set condition; and a second alertness estimation unit 14 that estimates a second alertness of the human based on the detected pulse wave.
    Type: Application
    Filed: February 1, 2019
    Publication date: October 6, 2022
    Applicant: NEC Corporation
    Inventor: Masanori TSUJIKAWA
  • Publication number: 20220265217
    Abstract: A drowsiness estimation information correction device includes: a drowsiness estimation information acquisition unit that acquires drowsiness estimation information that is based on an eyelid movement of a subject; and a drowsiness estimation information correction unit that calculates corrected drowsiness estimation information obtained by correcting the drowsiness estimation information with humidity information indicating humidity in a surrounding environment of the subject.
    Type: Application
    Filed: July 3, 2020
    Publication date: August 25, 2022
    Applicant: NEC Corporation
    Inventors: Takuma KOGO, Masanori TSUJIKAWA
  • Publication number: 20220167863
    Abstract: A blood volume pulse signal detection apparatus 300 includes a ROI decision unit 325 that determines a ROI in input movie data including image of human face, a sub-ROI decision unit 340 that determines a sub-ROI based on the ROI, a filter design unit 330 that designs a bandpass filter by performing the analysis at frequency domain and/or time domain using an average blood volume pulse signals at ROI according to the physiological characteristics of heart rate, and a noise reduction unit 350 that enhances a blood volume pulse signal at each sub-ROI using the bandpass filter.
    Type: Application
    Filed: March 27, 2019
    Publication date: June 2, 2022
    Applicant: NEC Corporation
    Inventors: Jingwen LU, Masanori TSUJIKAWA
  • Patent number: 11326801
    Abstract: An environmental apparatus controller performs control over multiple types of environmental apparatuses, and includes a grasping unit, learning control plan output means, and a selection control unit. The grasping unit grasps current mental and physical condition information of a user, environmental situation information, and target relationship information between a target mental and physical condition and a present mental and physical condition. The learning control plan output means outputs a control change plan for each combination of multiple types of the environmental apparatuses according to the current mental and physical condition information, the environmental situation information, and the target relationship information. The selection control unit selects one of a plurality of the control change plans output by the learning control plan output means and executes the plan.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: May 10, 2022
    Assignees: Daikin Industries, Ltd., NEC CORPORATION
    Inventors: Shiori Emoto, Atsushi Nishino, Satoshi Hashimoto, Shouta Hori, Junya Nakase, Masanori Tsujikawa, Yukihiro Kiuchi, Toshinobu Ogatsu
  • Publication number: 20220096016
    Abstract: A state estimation apparatus 10 includes: a filter generation unit 11 that generates a filter for emphasizing heart rate component and heart rate variable component by removing noise contained in a time series signal of a pulse wave obtained by an image data of a face image of a human; a noise removal unit 12 that performs a convolutional calculation between the bandpass filter generated by the filter generation unit 11 and the time-series signal of the pulse wave containing noise, thereby obtains a pulse wave after noise removal; a state estimation unit 13 that receives the time-series signal of the pulse wave after noise removal, which is the output of the noise removal unit 12, and outputs a state estimation value with reference to a state estimation model learned in advance.
    Type: Application
    Filed: February 1, 2019
    Publication date: March 31, 2022
    Applicant: NEC Corporation
    Inventor: Masanori TSUJIKAWA
  • Publication number: 20200390379
    Abstract: This drowsiness estimating device estimates a subject's drowsiness from a time-series signal of the subject's eye-openness width. A filtering circuitry filters the time-series signal of the eye-openness width to eliminate signal changes due to the subject blanking and outputs the filtered time-series signal of eye-openness. A feature calculator calculates a feature from at least the filtered time-series signal of the eye-openness width. A drowsiness estimator estimates a drowsiness evaluated value from the feature and outputs an estimated result. The feature calculator includes at least a first feature calculation circuit that calculates a variation of the filtered time-series signal of the eye-openness width within a feature calculation window width and outputs the variation as a first feature.
    Type: Application
    Filed: December 20, 2017
    Publication date: December 17, 2020
    Applicant: NEC CORPORATION
    Inventor: Masanori TSUJIKAWA
  • Patent number: 10748551
    Abstract: A noise suppression system includes an a priori S/N ratio estimated value and expectation calculation unit that acquires an expectation of a priori S/N ratio, by correcting an estimated value of the a priori S/N ratio relating to a signal and a noise based on a priori S/N ratio model or based on a signal model and a noise model, the signal and the noise being estimated from an input signal in which the signal and the noise are mixed; a noise suppression coefficient calculation unit that calculates a noise suppression coefficient with use of the expectation of the a priori S/N ratio; and a noise suppression unit that suppresses the noise included in the input signal by multiplying the input signal by the noise suppression coefficient.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: August 18, 2020
    Assignee: NEC CORPORATION
    Inventors: Masanori Tsujikawa, Ryosuke Isotani
  • Publication number: 20200224916
    Abstract: An environmental apparatus controller performs control over multiple types of environmental apparatuses, and includes a grasping unit, learning control plan output means, and a selection control unit. The grasping unit grasps current mental and physical condition information of a user, environmental situation information, and target relationship information between a target mental and physical condition and a present mental and physical condition. The learning control plan output means outputs a control change plan for each combination of multiple types of the environmental apparatuses according to the current mental and physical condition information, the environmental situation information, and the target relationship information. The selection control unit selects one of a plurality of the control change plans output by the learning control plan output means and executes the plan.
    Type: Application
    Filed: July 24, 2018
    Publication date: July 16, 2020
    Inventors: Shiori EMOTO, Atsushi NISHINO, Satoshi HASHIMOTO, Shouta HORI, Junya NAKASE, Masanori TSUJIKAWA, Yukihiro KIUCHI, Toshinobu OGATSU
  • Publication number: 20200056797
    Abstract: Provided an area-specific environment management system, which manages an environment in an individual one of a plurality of areas, the system including: a biological information sensor that acquires biological information about at least one of an individual and a group who belongs to an individual one of the areas; an environmental information sensor that acquires environmental information about an individual one of the areas; an arousal level estimation section that estimates an arousal level with respect to the biological information by using an arousal level estimation model; and an environment provision section that provides an environment to an individual one of the areas based on the arousal level and the environmental information, wherein the arousal level includes, as a state to which the arousal level belongs, a state from sleepy until awakened; a wakeful state; and an excessively wakeful state, and wherein the environment provision section includes an individual control mode corresponding to a stat
    Type: Application
    Filed: March 30, 2017
    Publication date: February 20, 2020
    Applicant: NEC Corporation
    Inventors: Masanori TSUJIKAWA, Yoshifumi ONISHI, So YAMADA, Toshinobu OGATSU, Yukihiro KIUCHI, Sho OHTANI
  • Patent number: 10347273
    Abstract: A speech processing apparatus includes: an expectation value calculation unit configured to calculate, using an input signal spectrum and a speech model that models a feature quantity of speech, a spectrum expectation value which is an expectation value of a spectrum of an acoustic component included in the input signal spectrum; and an acoustic power estimation unit configured to estimate an acoustic power of the acoustic component of the input signal spectrum based on the input signal spectrum and the spectrum expectation value.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: July 9, 2019
    Assignee: NEC CORPORATION
    Inventors: Shuji Komeiji, Masanori Tsujikawa, Ryosuke Isotani
  • Patent number: 10043532
    Abstract: To remove only noise components without removing desired signal components, a signal processing apparatus includes a noise decorrelator that removes noise signals having correlation between at least two input signals, in each of which a desired signal and a noise signal coexist, by receiving the at least two input signals from at least two channels, and a residual noise remover that removes residual noise included in an output signal of the noise decorrelator based on a phase difference between the output signal of the noise decorrelator and at least one input signal included in the at least two input signals.
    Type: Grant
    Filed: December 26, 2014
    Date of Patent: August 7, 2018
    Assignee: NEC CORPORATION
    Inventors: Masanori Tsujikawa, Ryosuke Isotani
  • Patent number: 10026414
    Abstract: A speech processing system placed in a vehicle to effectively acquire a voice of a driver includes a first microphone that is provided on a surface facing the driver of the vehicle out of a steering wheel of the vehicle, and inputs a voice of the driver, a second microphone that is provided at a position where the voice of the driver of the vehicle is blocked by at least part of the steering wheel in the vehicle, and inputs noise in the vehicle, and a noise suppressor that suppresses an estimated noise signal based on a first signal corresponding to the sound input to the first microphone and a second signal corresponding to the sound input to the second microphone, and generates and outputs a pseudo speech signal.
    Type: Grant
    Filed: May 14, 2014
    Date of Patent: July 17, 2018
    Assignee: NEC Corporation
    Inventors: Masanori Tsujikawa, Akihiko Sugiyama
  • Patent number: 9972336
    Abstract: An apparatus of this invention is directed to a speech input apparatus for obtaining a piece of high-quality speech with included noise reduced. The speech input apparatus includes a sound insulating block attached to a ceiling member in a vehicle, a first microphone that is attached to a side surface of the sound insulating block or the ceiling member in the vicinity of the sound insulating block on a side close to a passenger of the vehicle, inputs a sound mixture including the voice of the passenger and noise in the vehicle, and outputs a first signal to a noise suppressor configured to output an enhanced speech signal, and a second microphone that is attached to a side surface of the sound insulating block or the ceiling member in the vicinity of the sound insulating block on a side far from the passenger, inputs the noise in the vehicle, and outputs a second signal to the noise suppressor.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: May 15, 2018
    Assignee: NEC CORPORATION
    Inventors: Masanori Tsujikawa, Ken Hanazawa, Akihiko Sugiyama
  • Patent number: 9905243
    Abstract: A system of this invention is directed to a speech processing system that efficiently performs noise suppression processing for a plurality of noise sources spreading in a lateral direction with respect to a speaker of interest.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: February 27, 2018
    Assignee: NEC CORPORATION
    Inventors: Masanori Tsujikawa, Ken Hanazawa, Akihiko Sugiyama
  • Publication number: 20170364854
    Abstract: The purpose of the present invention is to provide a technology which is capable of appropriately evaluating a person's conduct with respect to another person. Provided is an information processing device, comprising a recognition unit 11, a detection unit 12, and an evaluation unit 13. The recognition unit 11 recognizes an evaluation subject's conduct. The detection unit 12 detects a trigger which is a state of a person other than the evaluation subject which triggers the evaluation subject's conduct. Using the detected trigger and the result of recognition by the recognition unit 13 relating to the evaluation subject's conduct, the evaluation unit 13 evaluates the evaluation subject's conduct.
    Type: Application
    Filed: December 2, 2015
    Publication date: December 21, 2017
    Inventors: Terumi UMEMATSU, Ryosuke ISOTANI, Yoshifumi OMISHI, Masanori TSUJIKAWA, Makoto TERAO, Tasuku KITADE, Shuji KOMEIJI
  • Patent number: 9847091
    Abstract: To input the voice of the passenger of a vehicle and output a piece of high-quality enhanced speech independently of the direction of a piece of speech or noise, a speech processing apparatus includes a first microphone that is provided on one of a ceiling member in a vehicle and an accessory thereof, inputs a sound mixture including a voice of a passenger of the vehicle and noise in the vehicle, and outputs a first signal, a second microphone that is provided on one of the ceiling member in the vehicle and the accessory thereof at a position farther than the first microphone when viewed from the passenger of the vehicle, inputs the noise in the vehicle while insulating the voice of the passenger of the vehicle using one of the ceiling member of the vehicle and the accessory thereof, and outputs a second signal, and a noise suppressor that outputs an enhanced speech signal based on the first signal and the second signal.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: December 19, 2017
    Assignee: NEC CORPORATION
    Inventors: Masanori Tsujikawa, Ken Hanazawa, Akihiko Sugiyama
  • Publication number: 20170337935
    Abstract: A speech processing apparatus includes: an expectation value calculation unit configured to calculate, using an input signal spectrum and a speech model that models a feature quantity of speech, a spectrum expectation value which is an expectation value of a spectrum of an acoustic component included in the input signal spectrum; and an acoustic power estimation unit configured to estimate an acoustic power of the acoustic component of the input signal spectrum based on the input signal spectrum and the spectrum expectation value.
    Type: Application
    Filed: December 8, 2015
    Publication date: November 23, 2017
    Applicant: NEC Corporation
    Inventors: Shuji KOMEIJI, Masanori TSUJIKAWA, Ryosuke ISOTANI
  • Publication number: 20170169837
    Abstract: A noise suppression system includes an a priori S/N ratio estimated value and expectation calculation unit that acquires an expectation of a priori S/N ratio, by correcting an estimated value of the a priori S/N ratio relating to a signal and a noise based on a priori S/N ratio model or based on a signal model and a noise model, the signal and the noise being estimated from an input signal in which the signal and the noise are mixed; a noise suppression coefficient calculation unit that calculates a noise suppression coefficient with use of the expectation of the a priori S/N ratio; and a noise suppression unit that suppresses the noise included in the input signal by multiplying the input signal by the noise suppression coefficient.
    Type: Application
    Filed: July 16, 2015
    Publication date: June 15, 2017
    Applicant: NEC Corporation
    Inventors: Masanori Tsujikawa, Ryosuke Isotani
  • Patent number: 9613631
    Abstract: Disclosed is a noise suppression system including a unit for calculating a noise mean spectrum from an input signal, a unit for deriving the provisional estimate speech from the input signal and the noise mean spectrum, a reference speech pattern, and a unit for correcting the provisional estimate speech using the reference pattern.
    Type: Grant
    Filed: July 20, 2006
    Date of Patent: April 4, 2017
    Assignee: NEC CORPORATION
    Inventors: Takayuki Arakawa, Masanori Tsujikawa
  • Publication number: 20170084290
    Abstract: To remove only noise components without removing desired signal components, a signal processing apparatus includes a noise decorrelator that removes noise signals having correlation between at least two input signals, in each of which a desired signal and a noise signal coexist, by receiving the at least two input signals from at least two channels, and a residual noise remover that removes residual noise included in an output signal of the noise decorrelator based on a phase difference between the output signal of the noise decorrelator and at least one input signal included in the at least two input signals.
    Type: Application
    Filed: December 26, 2014
    Publication date: March 23, 2017
    Inventors: Masanori TSUJIKAWA, Ryosuke ISOTANI