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公开(公告)号：US11350197B2
公开(公告)日：2022-05-31
申请号：US17038262
申请日：2020-09-30
发明人： Junji Araki , Shinichi Takayama
摘要： A noise reduction device includes a processor that converts a noise signal collected by a microphone disposed in a control space into a noise signal in a frequency domain, a storage that stores the converted noise signal in the frequency domain as a reference signal, and a signal generator that generates a noise reduction signal for reducing the noise signal collected by the microphone at a control position of the control space. The processor determines whether or not the noise signal is non-stationary noise based on a frequency characteristic of the converted noise signal in the frequency domain and a frequency characteristic of the reference signal. When it is determined that the noise signal is the non-stationary noise, the processor controls the signal generator so as to cancel generation of the noise reduction signal.
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公开(公告)号：US09848261B2
公开(公告)日：2017-12-19
申请号：US15485434
申请日：2017-04-12
发明人： Junji Araki , Hiromasa Ohashi , Naoya Tanaka
摘要： A howling removing apparatus according to the present disclosure is a howling removing apparatus to be connected to a microphone and a speaker. The howling removing apparatus includes: a nonlinear converter that nonlinearly converts a sound signal input to the speaker and outputs a nonlinear signal; a delay unit that delays the sound signal by a fixed time and outputs a delay signal; a norm calculator that calculates a norm from the delay signal; a filter coefficient generator that, based on the nonlinear signal, the delay signal and the norm, generates an adaptive filter that simulates a transfer characteristic of a space where the sound signal is reproduced from the speaker and is returned to the microphone; a cancel signal generator that convolves the delay signal and the adaptive filter with each other and generates a cancel signal; and a subtracter that subtracts the cancel signal from the sound signal. When an average sound pressure level of the sound signal exceeds a threshold value, the filter coefficient generator initializes the adaptive filter, thereby sensing oscillation of the adaptive filter even when a positional relationship between the microphone and the speaker is dynamically changed, and returning an output to normal.
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公开(公告)号：US12039992B2
公开(公告)日：2024-07-16
申请号：US17627398
申请日：2020-07-14
发明人： Junji Araki , Satoshi Abe , Takahiro Yamaguchi , Kenichi Kubota
IPC分类号： G10L21/0232 , G10L15/22 , H04R3/12 , G10K11/178 , H04R3/14
CPC分类号： G10L21/0232 , G10L15/22 , H04R3/12 , G10K11/178 , G10L2015/223 , H04R3/14
摘要： The voice control device includes a sound source signal input unit, a frequency determination unit, a band controller, a sound image controller, and a voice output unit. The sound source signal input unit inputs a sound source signal of content from a sound source. The frequency determination unit determines a cutoff frequency. The band controller acquires a high frequency signal in a frequency band equal to or higher than the cutoff frequency and a low frequency signal in a frequency band equal to or lower than the cutoff frequency, from the sound source signal of the content. The sound image controller generates a plurality of sound image control signals for controlling sound images of the plurality of speakers, by controlling at least one of a phase and a sound pressure level of the high frequency signal. The voice output unit outputs the low frequency signal to a first speaker, and outputs the plurality of sound image control signals to a second speaker composed of a plurality of speakers.
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公开(公告)号：US09794717B2
公开(公告)日：2017-10-17
申请号：US14969324
申请日：2015-12-15
发明人： Junji Araki
CPC分类号： H04S7/30 , H04S1/007 , H04S5/005 , H04S7/00 , H04S7/305 , H04S2400/01 , H04S2420/01
摘要： An audio signal processing apparatus includes: an obtaining unit which obtains a stereo signal including an R signal and an L signal; a control unit which generates a processed R signal and a processed L signal by performing (i) a first process of convolving pairs of right- and left-ear head related transfer functions into the R signal so that a sound image of the R signal is localized at each of two or more different positions at a right side of a listener; and (ii) a second process of convolving pairs of right- and left-ear head related transfer functions into the L signal so that a sound image of the L signal is localized at each of two or more different positions at a left side of the listener; and an output unit which outputs the processed R signal and the processed L signal.
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公开(公告)号：US11665459B2
公开(公告)日：2023-05-30
申请号：US17729231
申请日：2022-04-26
发明人： Junji Araki , Shinichi Takayama
CPC分类号： H04R1/08 , G10K11/17854 , G10L21/02 , H04M9/08 , H04R3/02
摘要： A noise reduction device includes a processor that converts a noise signal collected by a microphone disposed in a control space into a noise signal in a frequency domain, a storage that stores the converted noise signal in the frequency domain as a reference signal, and a signal generator that generates a noise reduction signal for reducing the noise signal collected by the microphone at a control position of the control space. The processor determines whether or not the noise signal is non-stationary noise based on a frequency characteristic of the converted noise signal in the frequency domain and a frequency characteristic of the reference signal. When it is determined that the noise signal is the non-stationary noise, the processor controls the signal generator so as to cancel generation of the noise reduction signal.
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公开(公告)号：US10687159B2
公开(公告)日：2020-06-16
申请号：US16297907
申请日：2019-03-11
发明人： Takahiro Yamaguchi , Toshihiro Ezaki , Kenichi Kubota , Masaru Matsuoka , Yuji Suzuki , Junji Araki , Shinichi Takayama
IPC分类号： G10K11/178 , H04R29/00 , G10K11/16
摘要： In a noise reduction device that generates and outputs a control sound signal for reducing noise, an internal loop control unit controls an internal loop in which a pre-output control sound signal that is acquired from a control sound output unit before output to a speaker is input to a sound receiver. A measurement unit measures an input level of a microphone sound signal and an input level of the pre-output control sound signal that has been input to the sound receiver in the internal loop. A fault detector uses the input level of the microphone sound signal and the input level of the pre-output control sound signal measured by the measurement unit to detect a fault in any one of the microphone, the sound receiver, the speaker, and the control sound output unit. A transmitter sends a result of fault detection performed by the fault detector to a management device.
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