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公开(公告)号：US20170223454A1
公开(公告)日：2017-08-03
申请号：US15485434
申请日：2017-04-12
Inventor： Junji ARAKI , Hiromasa OHASHI , Naoya TANAKA
Abstract: 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：US20200245066A1
公开(公告)日：2020-07-30
申请号：US16751857
申请日：2020-01-24
Inventor： Masanari MIYAMOTO , Hiromasa OHASHI , Naoya TANAKA
Abstract: A sound processing apparatus includes n number of microphones that are disposed correspondingly to n number of persons and that mainly collect sound signals uttered by respective relevant persons, a filter that suppresses crosstalk components included in a talker sound signal collected by a microphone corresponding to at least one talker using the sound signals collected by the n number of microphones, a parameter updater that updates a parameter of the filter for suppressing the crosstalk components and stores an update result in the memory in a case where a predetermined condition including time at which at least one talker talks is satisfied, and a sound output controller that outputs the sound signals, acquired by subtracting the crosstalk components by the filter from the talker sound signals based on the update result, from a speaker.
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公开(公告)号：US20240430635A1
公开(公告)日：2024-12-26
申请号：US18830143
申请日：2024-09-10
Inventor： Hiromasa OHASHI , Naoya TANAKA , Ryo HIROTA
Abstract: A control device controls sound of a plurality of speakers. The control device includes: a generation unit acquiring image data and generates display image data from the image data by using conversion processing using shape information indicating a shape of a display surface; a display controller displaying a display image on the display surface by using the display image data; a receiver causing a cursor to be superimposed and displayed on the display image and receives position designation related to the plurality of speakers on the display image from a user who has visually recognized the cursor; and an identification unit calculating a position of the cursor from the position designation by referring to a correspondence relationship between the image data before the conversion processing and the display image data after the conversion processing, and identifying the position of the cursor as a position related to the plurality of speakers.
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Patent Agency Ranking
公开(公告)号：US20210006900A1
公开(公告)日：2021-01-07
申请号：US17023924
申请日：2020-09-17
Inventor： Hiromasa OHASHI
IPC: H04R3/02 , G10L21/0208 , G10K11/178
Abstract: A conversation support device includes: a speaker; a microphone; a noise source acquisition unit that acquires a noise signal indicating noise; a first calculator that calculates a transfer characteristic of a secondary path between the speaker and the microphone; an echo cancellation unit that cancels an echo by using the transfer characteristic of the secondary path; a second calculator that calculates a coefficient of an adaptive filter, based on the transfer characteristic of the secondary path and the noise signal; and an active noise cancellation controller that generates a noise cancelling signal by using the coefficient of the adaptive filter and the noise signal. The noise cancelling signal is for controlling cancellation of the noise.
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公开(公告)号：US20220415337A1
公开(公告)日：2022-12-29
申请号：US17778277
申请日：2020-11-16
Inventor： Masanari MIYAMOTO , Naoya TANAKA , Hiromasa OHASHI
IPC: G10L21/0208 , G10L15/20 , H04R3/02
Abstract: An acoustic crosstalk suppression device includes a speaker estimation unit configured to estimate a main speaker based on voice signals collected by n units of microphones corresponding to n number of persons (n: an integer equal to or larger than 3); n units of filter update units each of which is configured to update a parameter of a filter configured to generate a suppression signal of a crosstalk component included in a voice signal of the main speaker; and a crosstalk suppression unit configured to suppress the crosstalk component by using a synthesis suppression signal generated by the maximum (n-1) units of filter update units corresponding to reference signals collected by the maximum (n-1) units of microphones.
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公开(公告)号：US20200321017A1
公开(公告)日：2020-10-08
申请号：US16841199
申请日：2020-04-06
Inventor： Masanari MIYAMOTO , Naoya TANAKA , Hiromasa OHASHI
IPC: G10L21/0208 , G10K11/16
Abstract: An acoustic noise suppressing apparatus outputs a first suppression audio signal in which the acoustic noise is suppressed by subtracting a first pseudo noise signal from the picked up audio signal, the first pseudo noise signal being generated based on a first delay signal and a first filter updated by a first algorithm which is valid when a plurality of talkers are talking, and outputs a second suppression audio signal in which the acoustic noise is suppressed by subtracting a second pseudo noise signal from the picked up audio signal, the second pseudo noise signal being generated based on a second delay signal and a second filter updated by a second algorithm which is valid when one talker is talking. The apparatus outputs a suppressed one of the first suppressed audio signal or the second suppressed audio signal.
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公开(公告)号：US20230037195A1
公开(公告)日：2023-02-02
申请号：US17967471
申请日：2022-10-17
Inventor： Hiromasa OHASHI , Naoya TANAKA , Ryo HIROTA
Abstract: A control device controls sound of a plurality of speakers. The control device includes: a generation unit acquiring image data and generates display image data from the image data by using conversion processing using shape information indicating a shape of a display surface; a display controller displaying a display image on the display surface by using the display image data; a receiver causing a cursor to be superimposed and displayed on the display image and receives position designation related to the plurality of speakers on the display image from a user who has visually recognized the cursor; and an identification unit calculating a position of the cursor from the position designation by referring to a correspondence relationship between the image data before the conversion processing and the display image data after the conversion processing, and identifying the position of the cursor as a position related to the plurality of speakers.
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公开(公告)号：US20200007690A1
公开(公告)日：2020-01-02
申请号：US16489897
申请日：2018-01-29
Inventor： Masanari MIYAMOTO , Hiromasa OHASHI , Naoya TANAKA
Abstract: A microphone picks-up voice of a driver. A first echo suppression unit outputs a voice signal after first echo suppression based on a voice signal of the driver and a voice signal after echo suppression in the past (first reference signal) stored in a buffer memory. A second echo suppression unit outputs a voice signal after second echo suppression based on a voice signal of the driver and a voice signal after the echo suppression in the past (second reference signal) stored in a buffer memory. An output signal selector selects one of the voice signals after the first echo suppression or the voice signal after the second echo suppression according to a detection result of the presence or absence of a system variation by a system variation detector, and causes a speaker to output the selected voice signal.
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