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公开(公告)号：US11996115B2
公开(公告)日：2024-05-28
申请号：US17435761
申请日：2019-12-18
Applicant: NEC Corporation
Inventor： Mitsuru Sendoda
IPC: G10L25/24 , G10L21/0208 , G10L25/18 , G10L25/51
Abstract: A sound processing apparatus includes a feature value extractor configured to perform a Fourier transform and then a cepstral analysis of a sound signal and to extract, as feature values of the sound signal, values including frequency components obtained by the Fourier transform of the sound signal and a value based on a result obtained by the cepstral analysis of the sound signal.
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公开(公告)号：US12044714B2
公开(公告)日：2024-07-23
申请号：US17270899
申请日：2018-08-30
Applicant: NEC Corporation
Inventor： Murtuza Petladwala , Mitsuru Sendoda , Yuko Ohta , Ryota Suzuki
CPC classification number: G01R23/10 , G01R23/145 , G01R23/18
Abstract: Provided a method comprising: obtaining waveform data sets of a periodic electric waveform signal, with a length set to one cycle time; calculating a frequency spectrum for each waveform data set; extracting and separating odd and even frequency harmonics to create odd and even frequency harmonic matrices on which a canonical correlation analysis (CCA) being applied to obtain CCA features; performing linear transformation on the CCA features to obtain linear transformed features; generating a model based on the linear transformed features; performing magnitude quantization of frequency spectrums of waveform data sets to identify normal and anomalous waveform signals.
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公开(公告)号：US11971694B2
公开(公告)日：2024-04-30
申请号：US16964636
申请日：2019-02-15
Applicant: NEC CORPORATION
Inventor： Mitsuru Sendoda
CPC classification number: G05B19/0425 , G01S3/8083 , G01S5/0063 , G05B19/0428 , G06N20/00 , H04N7/18 , H04N23/60 , H04R1/406 , H04R3/005 , G05B2219/35502 , G05B2219/37332 , G05B2219/37433 , G05B2219/40162 , H04R2430/20
Abstract: An abnormal-sound detection device has an imaging unit, an operation range identification unit, a sound collection unit, an abnormal-sound detection unit, an abnormal-sound generation position identification unit, and an abnormal-sound source determination unit. The operation range identification unit identifies and stores the operation range of a diagnosis object on the basis of the image captured by an imaging unit. The abnormal-sound detection unit detects abnormalities in sounds included in the sounds collected by the sound collection unit, the sounds arriving from the diagnosis object. When an abnormality in a sound is detected by the abnormal-sound detection unit, the abnormal-sound generation position identification unit identifies the position at which the abnormality of the sound was generated. The abnormal-sound source determination unit compares the operation range and the abnormal-sound generation position of the diagnosis object, and determines whether the abnormality of the sound is derived from an abnormality of the diagnosis object.
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公开(公告)号：US11838731B2
公开(公告)日：2023-12-05
申请号：US17440336
申请日：2019-03-28
Applicant: NEC Corporation
Inventor： Mitsuru Sendoda
CPC classification number: H04R3/005 , H04R1/406 , H04R29/005 , G01H3/08 , H04R2201/401
Abstract: A sound recognition apparatus (100) includes at least two microphones (1) that detect a surrounding sound, an attitude detection unit (4) that detects attitudes of the microphones (1), a self-position estimation unit (52) that estimates positions of the microphones (1) based on the attitudes of the microphones (1) and a signal of the sound detected by the microphone (1), a sound source estimation unit (53) that estimates a direction of the sound source (200) of the sound based on the attitudes of the microphones (1) and the signal of the sound detected by the microphone (1), and a sound environment mapping unit (54) that creates a sound environment map based on the positions of the microphones (1) and the direction of the sound source (200), the sound environment map displaying at least a position of the sound source (200).
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