Abstract: An active driving sound effect generator includes a waveform generator to generate a signal depending on vehicle information, multiple speakers to output the signal generated by the waveform generator, and a sound image control processor to change a volume of an output of the signal from each of the multiple speakers. The waveform generator generates a low frequency waveform signal containing relatively many low frequency components and a high frequency waveform signal containing more high frequency components than the low frequency waveform signal does.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An active noise reduction system includes an error microphone configured to generate an error signal, and a controller configured to control a speaker based on the error signal. The controller includes a control filter configured to generate a control signal, a secondary path filter that represents an estimation value of a transfer function of a secondary path, and a correction filter that represents a difference between acoustic characteristics at a position of the error microphone and acoustic characteristics at a position of a user. The controller is configured to generate a correction signal by the correction filter, generate a correction error signal by correcting the error signal using the correction signal, generate a canceling sound estimation signal by the secondary path filter based on the control signal, and adaptively update the secondary path filter based on the canceling sound estimation signal and the correction error signal.

Abstract: 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.

Abstract: 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.

Abstract: An active noise reduction system includes a canceling sound output device configured to output a canceling sound, an error microphone configured to generate an error signal, and a controller configured to control the canceling sound output device based on the error signal. The controller includes a control filter configured to generate a control signal for controlling the canceling sound output device, and a secondary path filter that represents an estimation value of a transfer function of a secondary path from the canceling sound output device to the error microphone. The active noise reduction system further includes a reference microphone provided separately from the error microphone, the reference microphone is configured to generate a determination signal based on at least a noise, and the controller is configured to determine whether the transfer function of the secondary path has changed based on the error signal and the determination signal.

Abstract: An active noise reduction system includes a canceling sound output device configured to output a canceling sound, an error microphone configured to generate an error signal, and a controller configured to control the canceling sound output device based on the error signal. The controller includes a control signal generation unit including a control filter configured to generate a control signal for controlling the canceling sound output device, and a sound field learning unit including a secondary path filter that represents an estimation value of a transfer function of a secondary path from the canceling sound output device to the error microphone, the control filter and the secondary path filter are configured to be adaptively updated, and the controller is configured to differentiate a timing of an adaptive update of the control filter and a timing of an adaptive update of the secondary path filter.

Abstract: An active noise reduction system includes a canceling sound output device configured to output a canceling sound for canceling a noise, an error microphone configured to generate an error signal based on the noise and the canceling sound, and a controller configured to control the canceling sound output device based on the error signal, wherein the controller is configured to calculate a canceling sound propagation distance that is a distance from the canceling sound output device to the error microphone, and suppress a change in the canceling sound based on the canceling sound propagation distance.

Abstract: An active noise reduction system of an IMC type includes a canceling sound output device, an error microphone, and a controller. The error microphone is configured to generate an error signal. The controller includes a control filter and a secondary path filter. The secondary path filter is configured to generate a canceling sound estimation signal. The control filter is configured to generate a control signal based on a reference signal generated based on both the error signal and the canceling sound estimation signal. The controller further includes a primary path filter configured to generate a noise estimation signal based on the reference signal. The secondary path filter and the primary path filter are configured to be adaptively updated based on a virtual error signal generated based on both the reference signal and the noise estimation signal.

Abstract: 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.

Abstract: 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.

Abstract: An active sound generation device is proposed to generate a sound effect in a vehicle interior. The active sound generation device includes: a low sampling rate generation part, generating a low sampling rate signal by lowering a sampling rate; a processing frequency setting part, setting the sampling rate of the low sampling rate generation part; a high sampling rate generation part, amplifying a sampling rate of the low sampling rate signal to generate a high sampling rate signal as the sound effect; and a speaker, outputting the sound effect.

Abstract: An active noise canceller device includes: a cancellation sound output device, outputting a cancellation sound for a noise; noise microphones, generating noise signals; a control device, controlling the cancellation sound output device based on the noise signals. The control device executes: obtaining noise signals, selecting reference signals corresponding to the noise and an error signal corresponding to an error of the noise and the cancellation sound from the noise signals, generating a correction reference signal, and generating a control signal. The control device includes: a control filter, generating the control signal of the control device; a primary path filter, generating a noise estimation signal from the reference signals; a secondary path filter, generating a cancellation sound estimation signal from the correction reference signal; and a stability judgment part, judging a stability of the cancellation sound from the control filter, the primary path filter, and the secondary path filter.

Abstract: An active noise canceller device includes: a reference signal generation device, generating a reference signal corresponding to a noise; a cancellation sound output device, outputting cancellation sound for canceling the noise; an error detection device, detecting an error between the noise and the cancellation sound and generating an error signal corresponding to the error; and a control device, controlling the cancellation sound output device that further including: a reference signal correction part, correcting the reference signal; a noise estimation part, estimating a sound pressure; a sound pressure estimation part, estimating the sound pressure within an object range of the cancellation sound that cancels the noise; and a control filter, controlling the cancellation sound. The active noise canceller device updates the control filter based on the reference signal corrected by the reference signal correction part and a sound pressure estimated value of the sound pressure estimation part.

Abstract: An active vibration control device includes: an outer hollow cylinder; an inner hollow cylinder arranged radially inside the outer hollow cylinder; a magnet coil (magnetic field generator) to generate a magnetic field; a magnetic material to provide a magnetic circuit by the magnetic field; a first liquid chamber filled with magneto-viscoelastic fluid; and a second liquid chamber adjacent to the first liquid chamber and filled with liquid, wherein the magnet coil, the magnetic material, the first liquid chamber, and the second liquid chamber are provided radially between the inner hollow cylinder and the outer hollow cylinder, the first liquid chamber is separated from the second liquid chamber by a flexible member, and the first liquid chamber has an orifice, through which the magnetic circuit is provided.

Abstract: An active noise control device controls a speaker on the basis of an error signal outputted from a detector that has detected, at a control point, a synthesized sound of a noise transmitted from a vibration source and a cancellation sound outputted from the speaker in order to cancel out the noise, and is provided with a control signal generation unit that generates a control signal for controlling the speaker by performing signal processing on a reference signal by a control filter corresponding to an error signal buffered at the end of an input buffer for buffering error signals on a time-series basis.

Abstract: A control apparatus for a vehicle that includes a drive wheel, an engine and an automatic transmission configured to transmit power from the engine toward the drive wheel. When the automatic transmission is shifted, the control apparatus is configured to execute a shifting-time torque-down control by using an ignition retard method of retarding an ignition timing of the engine or a fuel cut method of restricting fuel supply to the engine. The control apparatus is configured to estimate a temperature of a predetermined portion of an exhaust pipe of the engine in a case in which the shifting-time torque-down control is executed by using the ignition retard method, and to execute the shifting-time torque-down control by using the fuel cut method when an estimated value of the temperature of the predetermined portion of the exhaust pipe is not lower than a predetermined upper-limit temperature value.

Abstract: A control apparatus for a vehicle that includes a drive wheel, an engine and an automatic transmission configured to transmit power from the engine toward the drive wheel. When the automatic transmission is shifted, the control apparatus is configured to execute a shifting-time torque-down control by using an ignition retard method of retarding an ignition timing of the engine or a fuel cut method of restricting fuel supply to the engine. The control apparatus is configured to estimate a temperature of a predetermined portion of an exhaust pipe of the engine in a case in which the shifting-time torque-down control is executed by using the ignition retard method, and to execute the shifting-time torque-down control by using the fuel cut method when an estimated value of the temperature of the predetermined portion of the exhaust pipe is not lower than a predetermined upper-limit temperature value.