Patents by Inventor Akihiko Enamito
Akihiko Enamito has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20160284338Abstract: According to one embodiment, a noise reduction system for reducing noise including impact noise repetitively generated at a time interval includes the following elements. The error signal generator generates an error signal based on the noise being detected. The delay signal generator has a time delay characteristic and delays a signal, which is generated based on the error signal, to generate a delay signal, the time delay characteristic being determined based on an imaging sequence or pre-scanning by the MRI device and corresponding to the time interval. The control filter generates the first control signal from the delay signal. The loudspeaker unit includes at least one pair of a first filter and a control loudspeaker and a transmission unit.Type: ApplicationFiled: March 10, 2016Publication date: September 29, 2016Applicant: Kabushiki Kaisha ToshibaInventors: Tatsuhiko GOTO, Osamu Nishimura, Akihiko Enamito
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Publication number: 20160185290Abstract: According to an embodiment, a navigation device installed in a vehicle includes an obtainer, a controller, and a reproducer. The obtainer obtains at least one of vehicle information related to the vehicle and driver information related to a driver of the vehicle. The controller controls, based on at least one of the vehicle information and the driver information, localization direction of a playback sound which is to be reproduced for the driver. The reproducer reproduces the playback sound using a three dimensional sound based on control of the localization direction.Type: ApplicationFiled: December 22, 2015Publication date: June 30, 2016Inventors: Keiichiro Someda, Akihiko Enamito
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Publication number: 20150350788Abstract: According to an embodiment, an acoustic control apparatus applied to a loudspeaker system including first to Mth loudspeakers includes first to Mth control filters. The first to Mth control filters convolve a first input sound signal with first to Mth control filter coefficients to generate first to Mth sound signals. The first to Mth loudspeakers produce sounds based on the first to Mth sound signals. The second to Mth control filter coefficients are calculated based on the first control filter coefficient, and at least one first acoustic transfer function set from the first to Mth loudspeakers to at least one first one-ear position, so that a spatial average of at least one sound pressure of the sounds at the at least one first one-ear position comes close to 0.Type: ApplicationFiled: May 29, 2015Publication date: December 3, 2015Inventors: Keiichiro SOMEDA, Akihiko Enamito
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Publication number: 20150312695Abstract: According to an embodiment, a control filter coefficient is calculated in such a manner that a second spatial average of one or more complex sound pressure ratios at one or more target binaural positions when a first loudspeaker and a second loudspeaker emit a second acoustic signal and a first acoustic signal is approximated to a first spatial average of one or more complex sound pressure ratios at the one or more target binaural positions when a target virtual acoustic source emits the first acoustic signal.Type: ApplicationFiled: June 15, 2015Publication date: October 29, 2015Inventors: Akihiko Enamito, Osamu Nishimura, Takahiro Hiruma
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Patent number: 9154880Abstract: A first filter coefficient and a second filter coefficient are calculated by using spatial transfer characteristics from a first speaker and a second speaker to a first control point and a second control point, and a first sound increase ratio na at the first control point and a second sound increase ratio nb at the second control point, so that, when the first filter coefficient is a through characteristic, a first composite sound pressure from the first speaker and the second speaker to the first control point is na times a first sound pressure from the first speaker to the first control point, and a second composite sound pressure from the first speaker and the second speaker to the second control point is nb times a second sound pressure from the first speaker to the second control point.Type: GrantFiled: June 19, 2013Date of Patent: October 6, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Takahiro Hiruma, Akihiko Enamito, Osamu Nishimura
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Publication number: 20150281867Abstract: According to one embodiment, an acoustic control apparatus includes an acquisition unit, a detection unit, a correction unit, and an output unit. The acquisition unit acquires a first acoustic signal. The detection unit detects an information sound. When the detection unit detects the information sound, the correction unit corrects the first acoustic signal to a second acoustic signal by convoluting the first acoustic signal with a first function. The first function represents an acoustic transfer characteristic from a virtual position to a listening position. The virtual position is located along a first direction from the listening position. The output unit outputs the second acoustic signal.Type: ApplicationFiled: March 16, 2015Publication date: October 1, 2015Inventors: Akihiko ENAMITO, Keiichiro SOMEDA, Takahiro HIRUMA, Osamu NISHIMURA
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Publication number: 20150271603Abstract: According to an embodiment, a speaker system includes filters, speakers, and a sound collection unit. Each of the filters filters a first signal to generate a second signal. The speakers are arranged so that transfer characteristics from the speakers to an evaluation point are different from each other. Each of the speakers converts the second signal generated by a corresponding one of the filters into a sound wave. The sound collection unit combines sound waves output from the speakers to generate a combined sound wave. The filters are formed so that a transfer characteristic from the first signal to an output signal matches a target transfer characteristic, the output signal indicating a sound pressure of the combined sound wave at the evaluation point.Type: ApplicationFiled: March 11, 2015Publication date: September 24, 2015Inventors: Tatsuhiko GOTO, Akihiko Enamito, Osamu Nishimura
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Patent number: 9088854Abstract: According to an embodiment, a control filter coefficient is calculated in such a manner that a second spatial average of one or more complex sound pressure ratios at one or more target binaural positions when a first loudspeaker and a second loudspeaker emit a second acoustic signal and a first acoustic signal is approximated to a first spatial average of one or more complex sound pressure ratios at the one or more target binaural positions when a target virtual acoustic source emits the first acoustic signal.Type: GrantFiled: March 23, 2012Date of Patent: July 21, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Akihiko Enamito, Osamu Nishimura, Takahiro Hiruma
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Publication number: 20150172813Abstract: According to one embodiment, an active noise-reduction apparatus includes following units. The reference signal generation unit generates different reference signals based on target sound generated from a sound source. The filter processing unit generates first control signals by filtering the reference signals using first digital filters. The averaging unit generates a second control signal by averaging the first control signals. The control speaker outputs the second control signal as control sound. The error microphone detects a synthetic sound pressure of the target sound and the control sound to generate an error signal. The filter update unit updates the first digital filters so that the error signal is minimized.Type: ApplicationFiled: February 25, 2015Publication date: June 18, 2015Inventors: Tatsuhiko Goto, Osamu Nishimura, Akihiko Enamito
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Publication number: 20150092944Abstract: A first speaker radiates a first sound toward first and second listening points by a first sound signal. A second speaker radiates a second sound toward these points by a second sound signal. The first sound signal is generated by convolving a signal with a first filter coefficient. The second sound signal is generated by convolving the signal with a second filter coefficient. A nearer speaker to a virtual sound source is decided among the first and second speakers. The first and second filter coefficients are calculated so that a ratio of a first sound pressure of the first and second sounds at the first listening point to a second sound pressure thereof at the second listening point is equal to a target ratio. Among the first and second filter coefficients, based on one filter coefficient corresponding to the nearer speaker, the other filter coefficient corresponding to another speaker is calculated.Type: ApplicationFiled: September 16, 2014Publication date: April 2, 2015Inventors: Keiichiro SOMEDA, Akihiko ENAMITO
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Publication number: 20150086023Abstract: According to an embodiment, an audio control apparatus includes a calculation unit and a determination unit. The calculation unit is configured to calculate an interaural cross-correlation function of a binaural recording signal at regular time intervals. The determination unit is configured to determine that a signal zone in which peak times of interaural cross-correlation functions are consecutively included in one of a plurality of time ranges determined in advance is a localized-sound zone in which a sound-image is localized, each of the peak times being a time at which a corresponding cross-correlation function takes a maximum value.Type: ApplicationFiled: September 24, 2014Publication date: March 26, 2015Inventors: Akihiko ENAMITO, Keiichiro SOMEDA
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Patent number: 8973446Abstract: According to one embodiment, a pressure sensor includes a base, and a first sensor unit. The first sensor unit includes a first transducer thin film, a first strain sensing device and a second strain sensing device. The first strain sensing device includes a first magnetic layer, a second magnetic layer, and a first intermediate layer provided between the first and the second magnetic layers. The second strain sensing device is provided apart from the first strain sensing device on the first membrane surface and provided at a location different from a location of the barycenter, the second strain sensing device including a third magnetic layer, a fourth magnetic layer, and a second intermediate layer provided between the third and the fourth magnetic layers, the first and the second intermediate layers being nonmagnetic. The first and the second strain sensing devices, and the barycenter are in a straight line.Type: GrantFiled: December 28, 2012Date of Patent: March 10, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Hideaki Fukuzawa, Akihiko Enamito, Osamu Nishimura, Michiko Hara, Hiromi Yuasa, Yoshihiko Fuji, Masayuki Kii, Eizo Fujisawa
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Publication number: 20150047437Abstract: According to one embodiment, a pressure sensor includes a base, and a first sensor unit. The first sensor unit includes a first transducer thin film, a first strain sensing device and a second strain sensing device. The first strain sensing device includes a first magnetic layer, a second magnetic layer, and a first intermediate layer provided between the first and the second magnetic layers. The second strain sensing device is provided apart from the first strain sensing device on the first membrane surface and provided at a location different from a location of the barycenter, the second strain sensing device including a third magnetic layer, a fourth magnetic layer, and a second intermediate layer provided between the third and the fourth magnetic layers, the first and the second intermediate layers being nonmagnetic. The first and the second strain sensing devices, and the barycenter are in a straight line.Type: ApplicationFiled: October 29, 2014Publication date: February 19, 2015Applicant: Kabushiki Kaisha ToshibaInventors: Hideaki FUKUZAWA, Akihiko ENAMITO, Osamu NISHIMURA, Michiko HARA, Hiromi YUASA, Yoshihiko FUJI, Masayuki KII, Eizo FUJISAWA
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Publication number: 20140286501Abstract: According to one embodiment, a loudspeaker is provided in a case of an earphone. The case closes an external auditory canal extended from a tympanum of a listener. The earphone has an opening toward the external auditory canal. In an apparatus for generating a sound reproduction to the loudspeaker, a storage unit stores a correction filter in which a maximum of a gain at a frequency band lower than or equal to 10 kHz is larger than a maximum of a gain at a frequency band higher than 10 kHz. An acquisition unit acquires a first sound reproduction signal. A correction unit generates a second sound reproduction signal by convoluting the correction filter with the first sound reproduction signal. An output unit outputs the second sound reproduction signal to the loudspeaker.Type: ApplicationFiled: October 2, 2013Publication date: September 25, 2014Applicant: Kabushiki Kaisha ToshibaInventors: Akihiko ENAMITO, Takahiro Hiruma, Osamu Nishimura
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Publication number: 20140177882Abstract: A first filter coefficient and a second filter coefficient are calculated by using spatial transfer characteristics from a first speaker and a second speaker to a first control point and a second control point, and a first sound increase ratio na at the first control point and a second sound increase ratio nb at the second control point, so that, when the first filter coefficient is a through characteristic, a first composite sound pressure from the first speaker and the second speaker to the first control point is na times a first sound pressure from the first speaker to the first control point, and a second composite sound pressure from the first speaker and the second speaker to the second control point is nb times a second sound pressure from the first speaker to the second control point.Type: ApplicationFiled: June 19, 2013Publication date: June 26, 2014Inventors: Takahiro Hiruma, Akihiko Enamito, Osamu Nishimura
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Publication number: 20140169595Abstract: A first loudspeaker group driven by a first sound reproduction signal, radiates a plurality of first sounds, and generates a first sound image synthesized from the plurality of first sounds. A second loudspeaker group driven by a second sound reproduction signal, radiates a plurality of second sounds, and generates a second sound image synthesized from the plurality of second sounds. The first and second sound reproduction signals are generated so that a first sound pressure ratio of a first control point to a second control point is equal to a second sound pressure ratio of the first control point to the second control point. The first sound pressure ratio is formed by a third sound radiated from a virtual sound source driven by a target sound reproduction signal. The second sound pressure ratio is formed by a third sound image synthesized from the first and second sound images.Type: ApplicationFiled: August 22, 2013Publication date: June 19, 2014Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Akihiko ENAMITO, Osamu NISHIMURA, Takahiro HIRUMA
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Patent number: 8611186Abstract: According to one embodiment, a sound image localization apparatus includes following units. The first signal generating unit is configured to generate a first acoustic signal. The first speaker is configured to generate a first sound according to the first acoustic signal. The input unit is configured to input a localization magnification n. The first control filter unit is configured to adjust the first acoustic signal with a first control filter G1 calculated based on the input localization magnification n to generate a first adjusted acoustic signal. The second control filter unit is configured to adjust the first acoustic signal with a second control filter G2 calculated based on the input localization magnification n to generate a second adjusted acoustic signal. The second and third speakers are configured to generate second and third sounds according to the first and second adjusted acoustic signals, respectively.Type: GrantFiled: March 25, 2011Date of Patent: December 17, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Akihiko Enamito, Osamu Nishimura
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Publication number: 20130255393Abstract: According to one embodiment, a pressure sensor includes a base, and a first sensor unit. The first sensor unit includes a first transducer thin film, a first strain sensing device and a second strain sensing device. The first strain sensing device includes a first magnetic layer, a second magnetic layer, and a first intermediate layer provided between the first and the second magnetic layers. The second strain sensing device is provided apart from the first strain sensing device on the first membrane surface and provided at a location different from a location of the barycenter, the second strain sensing device including a third magnetic layer, a fourth magnetic layer, and a second intermediate layer provided between the third and the fourth magnetic layers, the first and the second intermediate layers being nonmagnetic. The first and the second strain sensing devices, and the barycenter are in a straight line.Type: ApplicationFiled: December 28, 2012Publication date: October 3, 2013Inventors: Hideaki Fukuzawa, Akihiko Enamito, Osamu Nishimura, Michiko Hara, Hiromi Yuasa, Yoshihiko Fuji, Masayuki Kii, Eizo Fujisawa
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Publication number: 20120328108Abstract: According to an embodiment, a control filter coefficient is calculated in such a manner that a second spatial average of one or more complex sound pressure ratios at one or more target binaural positions when a first loudspeaker and a second loudspeaker emit a second acoustic signal and a first acoustic signal is approximated to a first spatial average of one or more complex sound pressure ratios at the one or more target binaural positions when a target virtual acoustic source emits the first acoustic signal.Type: ApplicationFiled: March 23, 2012Publication date: December 27, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Akihiko Enamito, Osamu Nishimura, Takahiro Hiruma
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Publication number: 20120195447Abstract: According to one embodiment, a sound field control apparatus is provided with a control filter and a calculation unit. The filter executes an FIR computation for an acoustic signal using coefficients to output a main signal and control signals. The unit calculates the main coefficient and the coefficients based on Spatial transmission characteristics and a sound increase factor n, to set a composite sound pressure from a main speaker and control speakers to a first area to be n times of a coming sound pressure from only the main speaker, and to set a composite sound pressure from the main speaker and control speakers to a second area to be equal to the coming sound pressure from only the main speaker.Type: ApplicationFiled: January 25, 2012Publication date: August 2, 2012Inventors: Takahiro Hiruma, Akihiko ENAMITO, Osamu NISHIMURA