Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Kanazawa University

National University Corp Kanazawa University

Pioneer Corporation

Matsushita Denkisangyo Kabushiki Kaisha

Toshio Inoue

Akira Takahashi

Kosuke Sakamoto

Yasunori Kobayashi

Xun Wang

Yuho Ito

Osamu Terashima

Yoshio Nakamura

Masahide Onishi

Toshihiko Komatsuzaki

Hiroyuki Hashimoto

Kenichi Terai

Isao Kakuhari

Hisashi Sano

Koichi Tsuno

Takuma Maesaka

Toshiaki Kawakami

Ryo Oshima

Takumi Shiiyama

Minoru Maedako

Yoshinori Nakagawa

Tsuyoshi Yamashita

Yasuhiro Nakada

Junichi Eguchi

Satoru Minowa

Hiroyuki Yamada

Hiroshi Kobayashi

Hiroyuki Yoshida

Makoto Ogawa

Kenzo Shimada

Masayuki Sasaoka

Yoshinori Maekawa

Yoshihiro Iijima

Kazufumi Muronoi

Tsutomu Hirano

Takuya Kanisawa

Takahiro Ideguchi

Hideki Matsuoka

Jin Nishimura

Shungo Fueki

Toshihiko Ohashi

Hajime Igami

Kenji Yamagata

Shinji Fukumoto

Daniel McCain

Tomoki Ogita

Yoshiyuki Hayashi

Satoru Kikuchi

Takanori Yamamoto

So Nakamura

Katsumi Maruyama

Atsushi Sotome

Hiroshi Tokimoto

Yoichi Kan

Provided is a sound field control device configured to produce a listening area where a travel sound effect is audible and a quiet area in a sound field in a vehicle using a plurality of speakers. The sound field control device includes: a periodic waveform generator configured to generate different phase two periodic waveforms related to the travel sound effect based on the vehicle speed, and a sound field controller configured to, for each of the plurality of speakers, individually amplify and combine the different phase two periodic waveforms to generate a combined result using an SAN filter having coefficients set for the speaker based on locations of the listening area and the quiet area and feed the combined result to the speaker.

Sound field control device and filter determination system

A vibration damping device for a vehicle includes a subframe to which a vibration of a wheel is transmitted, a plurality of mounts arranged between the subframe and a vehicle body and configured such that stiffness of each mount in a prescribed direction changes according to an excitation current supplied thereto, and a controller configured to control the excitation current supplied to each mount, wherein the controller is configured to set a target elastic center of the subframe, and individually calculate the excitation current supplied to each mount so as to match an actual elastic center of the subframe with the target elastic center.

Vibration damping device for vehicle

Provided is a sound field control device including: a non-control-target component extractor configured to extract a non-control-target component from a sound source signal; a speaker selector configured to select one of plural speakers as a speaker to output the non-control-target component, based on the location of the listening area; a control-target component extractor configured to extract a control-target component from the sound source signal; a sound controller configured to, for each of the plural speakers, adjust the amplitude and the phase of the control-target component, based on locations of the listening area and a quiet area using filters each having coefficients set for the speaker; and sound combiners provided respectively for the plural speakers, the sound combiners each configured to combine the control-target component whose amplitude and phase have been adjusted and the non-control-target component and to output the combined result to the corresponding speaker.

A method includes calculating power consumption of a DC-DC converter, controlling the DC-DC converter so that an output direct current voltage output from the DC-DC converter becomes higher than a target voltage preset in the DC-DC converter when a power consumption is less than first power, and controlling the DC-DC converter so that the output direct current voltage output from the DC-DC converter becomes lower than the target voltage when the power consumption exceeds second power greater than the first power.

Power supply device for controlling voltage

An information processing apparatus with a DC-DC converter, comprising: a calculation unit configured to calculate an impedance of a mobile battery attached to the information processing apparatus; and a control unit configured to control continuation or stop of a boost operation of the DC-DC converter on a basis of the impedance, wherein the control unit performs control to continue the boost operation of the DC-DC converter when the impedance is less than a threshold, and performs control to continue the boost operation by limiting some of functions of the information processing apparatus when the impedance is equal to or more than the threshold and less than a second threshold.

Information processing apparatus, method for controlling information processing apparatus, and storage medium

A control circuit includes a first mode for thinning out pulses of a drive signal according to an input current, a hybrid mode combining pulse width control that controls a pulse width of the drive signal and intermittent control that thins out pulses of the drive signal, and a second mode for thinning out the pulses according to an output voltage. The control circuit selects the second mode when a duty ratio of the drive signal is a predetermined threshold or less, selects the hybrid mode when the duty ratio of the drive signal exceeds the predetermined threshold and the input voltage is a predetermined specified value or more, and selects the first mode when the duty ratio of the drive signal exceeds the predetermined threshold and the input voltage is less than the predetermined specified value.

DC-DC converter that converts direct current into another direct current

An active noise reduction system includes a canceling sound output device configured to output a canceling sound, a plurality of noise microphones configured to generate a plurality of noise signals based on a noise, and a controller configured to control the canceling sound output device based on the plurality of noise signals, wherein the controller is configured to acquire the plurality of noise signals output from the plurality of noise microphones, select a reference signal and an error signal from among the plurality of noise signals, the reference signal corresponding to the noise, the error signal corresponding to an error between the noise and the canceling sound, generate a correction reference signal by removing a component of the canceling sound from the reference signal, and generate a control signal based on the correction reference signal, the control signal being a signal for controlling the canceling sound output device.

Active noise reduction system, active noise reduction method, and non-transitory computer-readable storage medium

An active noise reduction system reduces a noise in an internal space of a mobile body. The active noise reduction system includes a controller configured to control a canceling sound output device. The controller is configured to generate a first canceling estimation signal as an estimation signal of a canceling sound at a position of an error detector based on a reference signal, generate a second canceling estimation signal as an estimation signal of the canceling sound at a head position of an occupant by adjusting a time delay and an amplitude of the first canceling estimation signal based on a reference distance, and update a control filter for controlling the canceling sound output device based on the second canceling estimation signal.

Active noise reduction system

An active noise reduction system includes a controller configured to acquire a plurality of noise signals output from a plurality of noise microphones, select a plurality of reference signals and an error signal from among the plurality of noise signals, the plurality of reference signals corresponding to a noise, the error signal corresponding to an error between the noise and a canceling sound, generate a control signal from the plurality of reference signals by using a plurality of control filters, and adaptively update the plurality of control filters by using a plurality of acoustic transmission filters. The plurality of acoustic transmission filters includes at least one adaptive update filter configured to be adaptively updated, and at least one non-adaptive update filter configured to be updated based on an update value of the adaptive update filter.

Active noise reduction system, active noise reduction method, and non- transitory computer-readable storage medium

An active noise reduction system includes a canceling sound output device configured to output a canceling sound for canceling a noise, a noise signal generator configured to generate noise signals based on the noise, and a controller configured to control the canceling sound output device based on the noise signals, wherein the controller is configured to acquire buffer data in which the noise signals are stored in a time series, generate a plurality of divided data by dividing the buffer data, calculate a correlation value of the buffer data based on the plurality of divided data, detect presence/absence of disturbance mixed in the buffer data based on the correlation value, and switch control over the canceling sound output device according to the presence/absence of the disturbance mixed in the buffer data.

An active noise reduction system includes a reference signal generator configured to generate a reference signal, a canceling sound generator configured to generate a canceling sound, an error detector configured to detect an error between a noise and the canceling sound and generate an error signal corresponding to the error, and a controller configured to control the canceling sound generator based on the reference signal and the error signal, wherein the controller is configured to update an estimation value of acoustic characteristics in an internal space of a mobile body based on the reference signal and the error signal, estimate a head position of an occupant in the internal space based on the updated estimation value of the acoustic characteristics, and update a control filter based on the estimated head position of the occupant, the control filter being a filter for controlling the canceling sound generator.

A charging control system includes a lawn mower that includes a battery and performs a lawn mowing work while traveling autonomously, and a charging station for charging the battery. The lawn mower includes a superimposing unit for superimposing, on a charging current, a current indicating period information for defining a shutoff period of supply power to be supplied from the charging station. The charging station includes a current detector for detecting the charging current, an information acquisition unit for acquiring period information based on a detection result of the current detector, a switch for shutting off the supply power, and a shutoff controller for controlling the operation of the switch. The shutoff controller releases the shutoff of supply of power to the lawn mower based on the period information acquired by the information acquisition unit. Therefore, the power consumption of the lawn mower can be reduced.

Charging control system, charging station, autonomous traveling work machine, and charging control system control method

Provided is an active acoustic control program that can reduce noise in a vehicle interior irrespective of the vehicle type, due to being installed in a device that is easily available to anyone. This active acoustic control program is downloaded using a communicator that transmits and receives data to and from a server, and this program causes a computation process device to execute a process for generating a control signal that causes a canceling sound to be outputted from a speaker provided in an interior of a vehicle in order to reduce noise in the vehicle interior. Said program is provided with an adaptive notch filter that processes a reference signal as an adaptive signal to generate a control signal, and a control filter coefficient update unit that continuously updates a filter coefficient of the adaptive notch filter so that an error signal is minimized.

Storage medium, microphone, and engine speed acquisition device

A mount bush includes: an inner tubular member; an outer tubular member arranged coaxially with the inner tubular member and surrounding an outer periphery of the inner tubular member with a clearance; and an elastic member connecting the inner tubular member with the outer tubular member, wherein the inner tubular member includes: an inner yoke having a coil therein; and an outer yoke coaxially coupled with the inner yoke at a radially outer position than the coil, and the elastic member has a first and second fluid chambers, facing each other across an axis of the inner tubular member and having magnetic fluid encapsulated therein, whose viscosity varies by a magnetic field, wherein the outer yoke has a communication passage communicating the first fluid chamber with the second fluid chamber, and is provided with a permanent magnet to generate a magnetic field in the communication passage.

Mount bush

An active sound effect generating device includes a tone adjusting unit for setting a plurality of different sub-fundamental frequencies by multiplying a fundamental frequency by coefficients, a first tone signal generating unit, a second tone signal generating unit, a third tone signal generating unit, and a fourth tone signal generating unit for generating tone signals corresponding to the respective sub-fundamental frequencies, and a sound effect signal generating unit for generating a sound effect signal for outputting sound effects from a speaker based on the tone signals.

Active sound effect generating device

Growing community of inventors

Wako, Japan

Toshio Inoue