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公开(公告)号：US11323802B2
公开(公告)日：2022-05-03
申请号：US16806190
申请日：2020-03-02
Inventor： Shinichi Yuzuriha
Abstract: Included are a first obtainer which obtains a first signal output from a first microphone, a second obtainer which obtains a second signal output from a second microphone installed in a position different from a position where first microphone is installed, a delayer which delays the second signal, a mixed sounds estimator which estimates noises mixed in the first signal on the basis of the second signal delayed by the delayer, and an eraser which erases the noises from the first signal, the noises being estimated by the mixed sounds estimator.
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2.发明授权公开(公告)号：US10418959B2
公开(公告)日：2019-09-17
申请号：US15949372
申请日：2018-04-10
Inventor： Shinichi Yuzuriha
IPC: H04B15/00 , H03G3/34 , G10L21/0264 , G10L21/0208 , G10L19/025 , G10L25/12
Abstract: A noise suppression apparatus disclosed is capable of suppressing pulse noise in an input signal even in a situation in which the level of the input signal changes. The pulse noise mixed in the input signal is suppressed, and linear prediction coefficients for the input signal is derived by linear prediction analysis. A prediction residual signal is then calculated from the input signal using the linear prediction coefficient. A threshold value is calculated based on the signal level of the input signal and the signal level of the prediction residual signal is compared with the threshold value. A limit control is performed on the prediction residual signal depending on a result of the comparison, and an output signal is generated based on the prediction residual signal having been subjected to the limit control using the linear prediction coefficient.
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公开(公告)号：US10999444B2
公开(公告)日：2021-05-04
申请号：US16711736
申请日：2019-12-12
Inventor： Shinichi Yuzuriha
IPC: G10L21/0224 , H04M9/08 , G10L21/0232 , H04R3/00 , H04R3/02 , G10L21/0208 , G10L21/0216
Abstract: An acoustic echo cancellation device includes: a first echo canceller which, using an input signal obtained from at least two microphones and a reproduced signal outputted to a speaker, produces a first pseudo echo signal which indicates a component of the reproduced signal contained in the input signal; and a second echo canceller which, using at least one input signal outputted from the at least two microphones and the first pseudo echo signal, produces a second pseudo echo signal which indicates a component of the first pseudo echo signal contained in the at least one input signal, and cancels an acoustic echo component of the at least one input signal using the second pseudo echo signal.
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Patent Agency Ranking
公开(公告)号：US10708702B2
公开(公告)日：2020-07-07
申请号：US16543047
申请日：2019-08-16
Inventor： Shinichi Yuzuriha , Takeo Kanamori
Abstract: A signal processing method includes: multiplying at least one of M signals output from M microphones by a gain so as to equalize sound pressure levels of the M signals, the M signals representing sounds that arrive at the M microphones from a sound source located within a predetermined distance from the M microphones, M being an integer equal to or greater than two; delaying at least one of the M signals so as to resolve time discrepancies between the M signals, the time discrepancies being caused by differences in arrival time between sounds that arrive at the M microphones from the sound source; and applying a filter so as to suppress a signal which is included in the M signals obtained through the multiplying and the delaying and which represents a sound output from the sound source located within the predetermined distance.
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公开(公告)号：US11967304B2
公开(公告)日：2024-04-23
申请号：US17846825
申请日：2022-06-22
Inventor： Shinichi Yuzuriha
IPC: H04R3/02 , G10K11/178 , H04M9/08 , G10L21/0208
CPC classification number: G10K11/17854 , H04M9/082 , H04R3/02 , G10L2021/02082
Abstract: A sound pick-up device includes an adaptive filter configured to generate, from a reference signal, an estimated noise signal indicating a component of a noise signal contained in an input signal, a noise elimination signal generator configured to generate a noise elimination signal by subtracting the estimated noise signal from the input signal, a filter coefficient update unit configured to update a filter coefficient of the adaptive filter using the noise elimination signal, and a sample position identification unit configured to identify at least one signal sample position among a plurality of signal sample positions from a signal sample position where the noise elimination signal has a maximum absolute value to a signal sample position where the noise elimination signal has an absolute value that is largest at a predetermined order, in which the filter coefficient update unit updates the filter coefficient at the at least one signal sample position.
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公开(公告)号：US11900920B2
公开(公告)日：2024-02-13
申请号：US17098753
申请日：2020-11-16
Inventor： Hiroki Furukawa , Shinichi Yuzuriha
IPC: G10L15/08 , G10L15/02 , G10L25/84 , H04R29/00 , G10L21/0216
CPC classification number: G10L15/08 , G10L15/02 , G10L25/84 , H04R29/005 , G10L2021/02166 , H04R2430/20 , H04R2430/25
Abstract: A sound pickup device includes a plurality of microphone elements, a sensitivity correcting unit that corrects a difference in sensitivity among the microphone elements by multiplying an output signal of each of the microphone elements by a gain. The sound pickup device also includes a target sound detecting unit that detects a voice of a speaker as a target sound, a sensitivity correction control unit that controls the gain based on a result of detecting the target sound, and a directivity synthesizing unit that picks up the target sound in a boosted manner using the output signals from the microphone elements of which difference in sensitivity is corrected. The sensitivity correction control unit updates the gain based on the output signals from the microphone elements if the voice of the speaker is detected and does not update the gain if the voice of the speaker is not detected.
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公开(公告)号：US11197093B2
公开(公告)日：2021-12-07
申请号：US17091768
申请日：2020-11-06
Inventor： Yuki Terashima , Shinichi Yuzuriha
Abstract: An echo suppression device includes an echo canceller which suppresses a linear echo signal from an input signal acquired by a microphone; a nonlinear echo estimation unit which, by using a nonlinear echo model indicative of a relationship between at least one of a call reception signal to be output to a speaker and the input signal, and a nonlinear echo signal, estimates the nonlinear echo signal included in the input signal from at least one of the call reception signal and the input signal; a nonlinear echo suppression unit which, by using the estimated nonlinear echo signal, suppresses the nonlinear echo signal from an output signal of the echo canceller; and an echo suppressor which suppresses a residual linear echo signal not suppressed by the echo canceller from an output signal of the nonlinear echo suppression unit.
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公开(公告)号：US09445189B2
公开(公告)日：2016-09-13
申请号：US14565933
申请日：2014-12-10
Inventor： Shinichi Yuzuriha
CPC classification number: H04R3/00 , H04N7/102 , H04R2410/00 , H04R2430/03 , H04R2499/11 , H04R2499/13
Abstract: A noise suppressing apparatus that calculates a suppression coefficient for suppressing noise of an input signal by using a frequency spectrum of the input signal includes a frequency converting section that converts the input signal into a frequency spectrum; a noise level estimating section that calculates an estimated noise level of the input signal; a weight coefficient calculating section that calculates N (N is 2 or more) weight coefficients at predetermined intervals; and a suppression coefficient calculating section that calculates a joint distribution model of sound by weighting N statistical distribution models with the N weight coefficients, derives an estimation expression for a sound spectrum of the input signal on the basis of posteriori probability using the calculated joint distribution model of sound as priori probability, and calculates the suppression coefficient on the basis of the derived estimation expression and level of the input signal.
Abstract translation: 通过使用输入信号的频谱来计算用于抑制输入信号的噪声的抑制系数的噪声抑制装置，包括将输入信号变换为频谱的频率变换部; 噪声电平估计部，其计算输入信号的估计噪声电平; 权重系数计算部，其以规定的间隔计算N（N为2以上）的权重系数; 以及抑制系数计算部，其通过利用N个权重系数对N个统计分布模型进行加权来计算声音的联合分布模型，基于所计算的联合分布模型，根据后验概率导出输入信号的声谱的估计表达式 的声音作为先验概率，并且基于导出的估计表达式和输入信号的电平来计算抑制系数。
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