Patents by Inventor Ken Hanazawa

Ken Hanazawa 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: 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
  • 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
  • Patent number: 9583095
    Abstract: A speech recognition unit (102) includes a phrase determination unit (103) which determines a phrase boundary based on the comparison between the hypothetical word group generated by speech recognition and set words representing phrase boundaries. In this speech processing device, the speech recognition unit (102) outputs recognition results for each phrase based on a phrase boundary determined by the phrase determination unit (103).
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: February 28, 2017
    Assignee: NEC CORPORATION
    Inventors: Ken Hanazawa, Seiya Osada, Takayuki Arakawa, Koji Okabe, Daisuke Tanaka
  • Patent number: 9449616
    Abstract: Provided are a noise reduction system that highly precisely estimates noise contained in an input signal and highly precisely reduces the noise contained in the input signal using the estimated noise, a speech detection system, a speech recognition system, a noise reduction method, and a noise reduction program.
    Type: Grant
    Filed: December 25, 2013
    Date of Patent: September 20, 2016
    Assignee: NEC CORPORATION
    Inventors: Masanori Tsujikawa, Ken Hanazawa, Shuji Komeiji
  • Publication number: 20160111109
    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: Application
    Filed: January 16, 2014
    Publication date: April 21, 2016
    Inventors: Masanori TSUJIKAWA, Ken HANAZAWA, Akihiko SUGIYAMA
  • Publication number: 20160049161
    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 accessary 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 accessary 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: Application
    Filed: January 16, 2014
    Publication date: February 18, 2016
    Applicant: NEC CORPORATION
    Inventors: Masanori TSUJIKAWA, Ken HANAZAWA, Akihiko SUGIYAMA
  • Publication number: 20150380011
    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: Application
    Filed: September 9, 2013
    Publication date: December 31, 2015
    Inventors: Masanori TSUJIKAWA, Ken HANAZAWA, Akihiko SUGIYAMA
  • Publication number: 20150356983
    Abstract: Provided are a noise reduction system that highly precisely estimates noise contained in an input signal and highly precisely reduces the noise contained in the input signal using the estimated noise, a speech detection system, a speech recognition system, a noise reduction method, and a noise reduction program.
    Type: Application
    Filed: December 25, 2013
    Publication date: December 10, 2015
    Inventors: Masanori TSUJIKAWA, Ken HANAZAWA, Shuji KOMEIJI
  • Publication number: 20150279373
    Abstract: A voice response apparatus, method and non-transitory computer-readable storage medium are disclosed. The voice response apparatus may include a memory storing instructions, and one or more processors configured to process the instructions to detect an input voice from an input signal using a first frequency bandwidth, output a response voice including predetermined amount of components of a second frequency bandwidth, and set the first frequency bandwidth so that the first frequency bandwidth and the second frequency bandwidth do not overlap each other.
    Type: Application
    Filed: March 30, 2015
    Publication date: October 1, 2015
    Inventors: Ken HANAZAWA, Reishi Kondo
  • Patent number: 9047562
    Abstract: A plurality of pruning measures (PM) are calculated from a feature amount (CV) of test data (TD) which is input, a plurality of isopycnic surfaces (EC) are plotted and set on a threshold space (SS), a threshold curved surface (SC) in which a decrease in at least one of a plurality of pruning measures (PM) causes an increase in at least one thereof is generated using a portion of one isopycnic surface (EC) as a part, a hypothesis curved surface (HC) of subject data (CD) is generated on the threshold space (SS) to set a position intersecting the threshold curved surface (SC) to a pruning threshold (PS), and a plurality of hypotheses of the subject data (CD) are pruned. Thereby, there is provided a data processing device of which at least one of the recognition speed and the recognition accuracy is higher than in the related art.
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: June 2, 2015
    Assignee: NEC CORPORATION
    Inventors: Koji Okabe, Ken Hanazawa, Seiya Osada, Takayuki Arakawa, Daisuke Tanaka
  • Patent number: 9043209
    Abstract: This device 301 stores a first content-specific language model representing a probability that a specific word appears in a word sequence representing a first content, and a second content-specific language model representing a probability that the specific word appears in a word sequence representing a second content. Based on a first probability parameter representing a probability that a content represented by a target word sequence included in a speech recognition hypothesis generated by a speech recognition process of recognizing a word sequence corresponding to a speech, a second probability parameter representing a probability that the content represented by the target word sequence is a second content, the first content-specific language model and the second content-specific language model, the device creates a language model representing a probability that the specific word appears in a word sequence corresponding to a part corresponding to the target word sequence of the speech.
    Type: Grant
    Filed: September 3, 2009
    Date of Patent: May 26, 2015
    Assignee: NEC CORPORATION
    Inventors: Hitoshi Yamamoto, Ken Hanazawa, Kiyokazu Miki
  • Patent number: 8682668
    Abstract: A speech recognition apparatus that performs frame synchronous beam search by using a language model score look-ahead value prevents the pruning of a correct answer hypothesis while suppressing an increase in the number of hypotheses. A language model score look-ahead value imparting device 108 is provided with a word dictionary 203 that defines a phoneme string of a word, a language model 202 that imparts a score of appearance easiness of a word, and a smoothing language model score look-ahead value calculation means 201. The smoothing language model score look-ahead value calculation means 201 obtains a language model score look-ahead value at each phoneme in the word from the phoneme string of the word defined by the word dictionary 203 and the language model score defined by the language model 202 so that the language model score look-ahead values are prevented from concentrating on the beginning of the word.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: March 25, 2014
    Assignee: NEC Corporation
    Inventors: Koji Okabe, Ryosuke Isotani, Kiyoshi Yamabana, Ken Hanazawa
  • Patent number: 8639507
    Abstract: The present invention enables the recognition process at high speed even when a lot of garbage is included in the grammar. The first voice recognition processing unit generates a recognition hypothesis graph which indicates a structure of hypothesis that is derived according to a first grammar together with a score associated with respective connections of a recognition unit by executing a voice recognition process based on the first grammar to a voice feature amount of input voice, and the second voice recognition processing unit outputs the recognition result from a total score of a hypothesis which is derived according to a second grammar after executing a voice recognition process according to the second grammar that is specified to accept a section other than keywords in input voice as the garbage section to a voice feature amount of input voice, and the second voice recognition processing unit acquires the structure and the score of the garbage section from the recognition hypothesis graph.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: January 28, 2014
    Assignee: NEC Corporation
    Inventors: Fumihiro Adachi, Ryosuke Isotani, Ken Hanazawa
  • Patent number: 8612225
    Abstract: A voice recognition device that recognizes a voice of an input voice signal, comprises a voice model storage unit that stores in advance a predetermined voice model having a plurality of detail levels, the plurality of detail levels being information indicating a feature property of a voice for the voice model; a detail level selection unit that selects a detail level, closest to a feature property of an input voice signal, from the detail levels of the voice model stored in the voice model storage unit; and a parameter setting unit that sets parameters for recognizing the voice of an input voice according to the detail level selected by the detail level selection unit.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: December 17, 2013
    Assignee: NEC Corporation
    Inventors: Takayuki Arakawa, Ken Hanazawa, Masanori Tsujikawa
  • Publication number: 20130282374
    Abstract: A speech recognition device has: hypothesis search means which searches for an optimal solution of inputted speech data by generating a hypothesis which is a bundle of words which are searched for as recognition result candidates; self-repair decision means which calculates a self-repair likelihood of a word or a word sequence included in the hypothesis which is being searched for by the hypothesis search means, and decides whether or not self-repair of the word or the word sequence is performed; and transparent word hypothesis generation means which, when the self-repair decision means decides that the self-repair is performed, generates a transparent word hypothesis which is a hypothesis which regards as a transparent word a word or a word sequence included in an un-repaired interval related to the word or the word sequence, and the hypothesis search means searches hypotheses for an optimal solution, the hypotheses including as search target hypotheses the transparent word hypothesis generated by the transp
    Type: Application
    Filed: January 5, 2012
    Publication date: October 24, 2013
    Applicant: NEC CORPORATION
    Inventors: Koji Okabe, Ken Hanazawa, Seiya Osada
  • Publication number: 20130268271
    Abstract: A speech recognition system has: hypothesis search means which searches for an optimal solution of inputted speech data by generating a hypothesis which is a bundle of words which are searched for as recognition result candidates; self-repair decision means which calculates a self-repair likelihood of a word or a word sequence included in the hypothesis which is being searched for by the hypothesis search means, and decides whether or not self-repair of the word or the word sequence is performed; and transparent word hypothesis generation means which, when it is decided that the self-repair is performed, generates a transparent word hypothesis which is a hypothesis which regards as a transparent word a word or a word sequence included in a disfluency interval or a repair interval of a self-repair interval including the word or the word sequence.
    Type: Application
    Filed: December 22, 2011
    Publication date: October 10, 2013
    Applicant: NEC CORPORATION
    Inventors: Seiya Osada, Ken Hanazawa, Koji Okabe
  • Publication number: 20130144609
    Abstract: Provided is a text processing system capable of avoiding declining processing efficiency in analyses of text that does not contain breaks. This text processing system comprises: a linking means for generating linking data that links acquired text after the link object analysis result, which are the results of the analysis of text acquired prior to the acquired text; an analysis means for carrying out language analysis on the linked data, using at least a portion of the link object analysis result; and a determination means for determining a prescribed unit break included in the linked data, on the basis of the results of the analysis by the analysis means. The link object analysis results are the results of the analysis after the break that is determined by the determination means. The link object analysis results are the results of the analysis after the break that is determined by the determination means.
    Type: Application
    Filed: August 2, 2011
    Publication date: June 6, 2013
    Applicant: NEC CORPORATION
    Inventors: Seiya Osada, Ken Hanazawa, Takayuki Arakawa, Koji Okabe, Daisuke Tanaka
  • Publication number: 20120310866
    Abstract: A plurality of pruning measures (PM) are calculated from a feature amount (CV) of test data (TD) which is input, a plurality of isopycnic surfaces (EC) are plotted and set on a threshold space (SS), a threshold curved surface (SC) in which a decrease in at least one of a plurality of pruning measures (PM) causes an increase in at least one thereof is generated using a portion of one isopycnic surface (EC) as a part, a hypothesis curved surface (HC) of subject data (CD) is generated on the threshold space (SS) to set a position intersecting the threshold curved surface (SC) to a pruning threshold (PS), and a plurality of hypotheses of the subject data (CD) are pruned. Thereby, there is provided a data processing device of which at least one of the recognition speed and the recognition accuracy is higher than in the related art.
    Type: Application
    Filed: December 2, 2010
    Publication date: December 6, 2012
    Applicant: NEC CORPORATION
    Inventors: Koji Okabe, Ken Hanazawa, Seiya Osada, Takayuki Arakawa, Daisuke Tanaka
  • Patent number: 8315870
    Abstract: A distance calculation unit (16) obtains the acoustic distance between the feature amount of input speech and each phonetic model. A word search unit (17) performs a word search based on the acoustic distance and a language model including the phoneme and prosodic label of a word, and outputs a word hypothesis and a first score representing the likelihood of the word hypothesis. The word search unit (17) also outputs a vowel interval and its tone label in the input speech, when assuming that the recognition result of the input speech is the word hypothesis. A tone recognition unit (21) outputs a second score representing the likelihood of the tone label output from the word search unit (17) based on a feature amount corresponding to the vowel interval output from the word search unit (17). A rescore unit (22) corrects the first score of the word hypothesis output from the word search unit (17) using the second score output from the tone recognition unit (21).
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: November 20, 2012
    Assignee: NEC Corporation
    Inventor: Ken Hanazawa