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公开(公告)号：US10911988B2
公开(公告)日：2021-02-02
申请号：US15788722
申请日：2017-10-19
Inventor： Takako Hori , Hiroyuki Ehara
Abstract: A communication node determines a codec and a codec mode to be used by two terminals that perform communication in a first network, when one of the two terminals performs handover to a second network that is different from the first network. The communication node includes: a determiner that sets common part for a codec and a codec mode to be used by the two terminals, the common part being common among information indicating codecs and codec modes used for communication in the first network, information indicating codecs and codec modes supported by the one terminal, and information indicating codecs and codec modes supported by the second network; and a generator that generates signaling for requesting the two terminals to perform changing to the set codec and codec mode to be used by the two terminals.
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公开(公告)号：US20250150770A1
公开(公告)日：2025-05-08
申请号：US19016689
申请日：2025-01-10
Inventor： Hikaru USAMI , Tomokazu Ishikawa , Seigo Enomoto , Kota Nakahashi , Hiroyuki Ehara , Mariko Yamada , Shuji Miyasaka
IPC: H04S7/00
Abstract: An information generation method includes: obtaining a second wind direction of a second wind blowing in a virtual space and a second assumed wind speed which is a speed of the second wind; generating fifth object audio information in which the obtained second wind direction and second assumed wind speed are associated; storing aerodynamic sound core information including a representative wind speed and aerodynamic sound data indicating aerodynamic sound generated by wind blowing at the representative wind speed reaching an ear of a listener in the virtual space; and outputting the generated fifth object audio information and the stored aerodynamic sound core information.
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13.发明授权公开(公告)号：US12230287B2
公开(公告)日：2025-02-18
申请号：US17768801
申请日：2020-09-04
Inventor： Akira Harada , Hiroyuki Ehara
IPC: G10L19/035
Abstract: This quantization scale factor determination device is provided with a correction circuit which corrects an initial value of a quantization scale factor on the basis of whether or not an audio signal spectrum is sparse, and a search circuit which searches for a quantization scale factor on the basis of the initial value.
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公开(公告)号：US20250024221A1
公开(公告)日：2025-01-16
申请号：US18892983
申请日：2024-09-23
Inventor： Seigo Enomoto , Hikaru Usami , Kota Nakahashi , Hiroyuki Ehara , Mariko Yamada , Tomokazu Ishikawa , Ko Mizuno
IPC: H04S7/00
Abstract: Each of one or more audio objects includes: sound data of a sound emitted from an object that corresponds to the audio object; and metadata that includes position information indicating a position of the object in a virtual sound space. A sound signal processing device includes: a selector that selects an audio object as a conversion target from among the one or more audio objects; and an fluctuation imparter that converts the audio object selected as the conversion target to impart, to the audio object selected, a fluctuation effect of fluctuating a sound emitted from an object that corresponds to the audio object converted when the sound signal is reproduced. The selector does not select an audio object that corresponds to an object whose position is moving in the virtual sound space based on a transition over time of the position information included in the metadata.
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15.发明授权公开(公告)号：US11994605B2
公开(公告)日：2024-05-28
申请号：US17600513
申请日：2020-03-16
Inventor： Rohith Mars , Srikanth Nagisetty , Chong Soon Lim , Hiroyuki Ehara , Akihisa Kawamura
CPC classification number: G01S3/8027 , G01S3/8083 , H04R1/406
Abstract: Provided is a direction of arrival estimation device wherein: a calculation circuit calculates a frequency weighting factor for each of a plurality of frequency components of signals recorded in a microphone array, on the basis of the differences among unit vectors indicating the directions of the sound sources of each of the plurality of frequency components; and an estimation circuit estimates the direction of arrival of a signal from the sound source, on the basis of the frequency weighting factors.
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Patent Agency Ranking
公开(公告)号：US09747916B2
公开(公告)日：2017-08-29
申请号：US15002328
申请日：2016-01-20
Inventor： Hiroyuki Ehara , Takako Hori
IPC: G10L19/00 , G10L19/12 , G10L19/005 , G10L19/038 , G10L19/125
CPC classification number: G10L19/12 , G10L19/005 , G10L19/038 , G10L19/125 , G10L2019/0002 , G10L2019/001 , G10L2019/0013 , G10L2019/0016
Abstract: In a CELP-type speech coding apparatus, switching between an orthogonal search of a fixed codebook and a non-orthogonal search is performed in a practical and effective manner. The CELP-type speech coding apparatus includes a parameter quantizer that selects an adaptive codebook vector and a fixed codebook vector so as to minimize an error between a synthesized speech signal and an input speech signal. The parameter quantizer includes a fixed codebook searcher that switches between the orthogonal fixed codebook search and the non-orthogonal fixed codebook search based on a correlation value between a target vector for the fixed codebook search and the adaptive codebook vector obtained as a result of a synthesis filtering process.
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17.发明申请公开(公告)号：US20250150776A1
公开(公告)日：2025-05-08
申请号：US19013363
申请日：2025-01-08
Inventor： Hikaru USAMI , Tomokazu Ishikawa , Seigo Enomoto , Kota Nakahashi , Hiroyuki Ehara , Mariko Yamada , Shuji Miyasaka
Abstract: An acoustic signal processing method includes: obtaining first position information indicating a position of an object that is a moving object in a virtual space, and second position information indicating a position of a listener in the virtual space; calculating a moving speed of the object based on the first position information obtained; calculating a distance between the object and the listener based on the first position information obtained and the second position information obtained; generating, based on the moving speed calculated and the distance calculated, an aerodynamic sound signal indicating an aerodynamic sound generated when wind caused by movement of the object reaches an ear of the listener; and outputting the aerodynamic sound signal generated.
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公开(公告)号：US10777209B1
公开(公告)日：2020-09-15
申请号：US16499935
申请日：2018-04-17
Inventor： Hiroyuki Ehara , Akihisa Kawamura , Kai Wu , Srikanth Nagisetty , Sua Hong Neo
IPC: G10L19/008 , H04R1/40 , G10L19/032
Abstract: A sound source estimation unit (101) estimates, in a space as a target of sparse sound field decomposition, an area where a sound source is present at second granularity that is coarser than first granularity of a position where a sound source is assumed to be present in the sparse sound field decomposition. A sparse sound field decomposition unit (102) decomposes an acoustic signal observed by a microphone array into a sound source signal and an ambient noise signal by performing a sparse sound field decomposition process at the first granularity for the acoustic signal in the area at the second granularity where the sound source is estimated to be present in the space.
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公开(公告)号：US10555107B2
公开(公告)日：2020-02-04
申请号：US16341861
申请日：2017-10-11
Inventor： Hiroyuki Ehara , Kai Wu , Sua Hong Neo
IPC: G10L19/008 , H04S7/00
Abstract: The present disclosure relates to the design of a fast binaural rendering for multiple moving audio sources. This disclosure takes the audio source signals which can be object-based, channel-based or a mixture of both, associated metadata, user head tracking data and binaural room impulse response (BRIR) database to generate the headphone playback signals. The present disclosure applies a frame-by-frame binaural rendering module which takes parameterized components of BRIRs for rendering moving sources. In addition, the present disclosure applies hierarchical source clustering and downmixing in the rendering process to reduce computational complexity.
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公开(公告)号：US10424308B2
公开(公告)日：2019-09-24
申请号：US15976987
申请日：2018-05-11
Inventor： Hiroyuki Ehara , Takanori Aoyama
IPC: G10L19/008 , G10L19/00 , H04R1/40 , H04S3/00
Abstract: An audio sound signal encoding device includes: a converter that adds up all multiple channel signals included in multichannel voice sound input signals to generate an addition signal and generates a difference signal between channels of the multiple channel signals; a first encoder that encodes the addition signal in a coding mode in accordance with a characteristic of the addition signal to generate first encoded data; a second encoder that encodes the difference signal in the coding mode that was used for encoding the addition signal, to generate second encoded data; and a multiplexer that multiplexes the first encoded data and the second encoded data to generate multichannel encoded data.
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