Abstract: According to an embodiment, an acoustic signal processing apparatus includes processing circuitry. The processing circuitry includes a modulation frequency control unit, frequency shift processing unit, and amplitude control unit. The modulation frequency control unit is configured to control a first modulation frequency based on velocity information indicating a velocity of a sound source. The frequency shift processing unit is configured to perform single-sideband (SSB) modulation on a first acoustic signal in accordance with the first modulation frequency to generate a first modulated acoustic signal. The amplitude control unit is configured to control an amplitude of the first modulated acoustic signal.

Abstract: According to one embodiment, an acoustic control apparatus includes a processor. The processor calculates a frequency characteristic of a filter from 1) a complex volume velocity of a sound radiated from each point sound source based on the number of point sound sources in a simulated rotating sound source and a lobe mode of the simulated rotating sound source, and 2) an acoustic transfer function between a sound receiving point and each point sound source, which is based on a radius of a circle formed by the point sound sources, a horizontal distance between a center of the circle and the sound receiving point, and a vertical distance between the center of the circle and the sound receiving point. The processor calculates the filter from the frequency characteristic of the filter. The processor stores the filter in a storage.

Abstract: A diagnostic apparatus includes an excitation unit, a first sound reception unit, a second sound reception unit, and a processor. The processor designates a plurality of various volumes for the excitation unit. The processor calculates a first reference impulse response, a second reference impulse response, a first evaluation impulse response, and a second evaluation impulse response. The processor calculates a correlation transfer function. The processor calculates a difference between a first evaluation characteristic and a first reference characteristic. The processor diagnoses a measurement object based on the difference and a characteristic that a volume of a vibration radiation sound shifts from a dead zone to a rise region to a linear region to a saturation zone in this order as a volume of the excitation sound changes.

Abstract: The present invention performs: generating base station positional relationship specification data indicating a positional relationship between travel trajectory and a base station candidate position, and terminal station positional relationship specification data indicating a positional relationship between the travel trajectory and a terminal station candidate position, based on travel trajectory data indicating the travel trajectory of a moving body for measuring an object present in a three-dimensional space within a measurable distance predetermined and acquiring point cloud data indicating a position of the object measured in the three-dimensional space, the measurable distance, base station candidate position data indicating a candidate position for installing a base station apparatus, and terminal station candidate position data indicating a candidate position for installing a terminal station apparatus; and specifying a reliability coefficient indicating a degree of reliability of a processing result

Abstract: A sound inspection apparatus that includes at least three microphones, a removing unit, and an estimation unit. The removing unit calculates an impulse response based on a sound pressure of a radiation sound collected via a reference microphone and a first microphone, calculates an impulse response based on the sound pressure of the radiation sound collected via the reference microphone and a second microphone, and removes a component corresponding to the vibration sound from the calculated impulse response. The intensity calculation unit calculates an intensity of the radiation sound based on the impulse response from which the vibration sound is removed, and the estimation unit estimates, based on the calculated intensity, a site where an abnormality in the inspection target object has occurred.

Abstract: According to an embodiment, a sound emitting apparatus includes a vibrator, a holding part, and a fixing part. The holding part is configured to hold the vibrator. The fixing part is configured to fix the holding part. A stiffness of the fixing part is lower than a stiffness of the holding part.

Abstract: An online conversation management apparatus includes a processor. The processor acquires, across a network, reproduction environment information from at least one terminal that reproduces a sound image via a reproduction device. The reproduction environment information is information of a sound reproduction environment of the reproduction device. The processor acquires azimuth information. The azimuth information is information of a localization direction of the sound image with respect to a user of the terminal. The processor performs control for reproducing a sound image of each terminal based on the reproduction environment information and the azimuth information.

Abstract: According to one embodiment, a sound absorption apparatus includes a front plate, a back plate, a diaphragm, a supporting member, a second frame, and a third frame. The front plate has a sound hole. The back plate faces the front plate. The diaphragm is provided between the front plate and the back plate. The supporting member supports the diaphragm. The supporting member includes a first frame attached to the diaphragm, a first member located inside the first frame and attached to the diaphragm, and a connecting member connecting the first frame and the first member. The second frame forms a first space between the front plate and the diaphragm. The third frame forms a second space between the back plate and the diaphragm.

Abstract: According to an embodiment, a diagnostic apparatus includes a sound-emitting unit, at least one measurement unit, and a processor. The sound-emitting unit includes a plurality of speakers arranged at equal angular intervals on a circumference of a circle, and is configured to emit a first vibration sound to a target by using the speakers. The at least one measurement unit is arranged on a central axis of the circle, and is configured to measure a vibration of the target generated in response to the first vibration sound, or a second vibration sound radiated from the target due to the vibration. The processor is configured to diagnose the target based on an output from the at least one measurement unit.

Abstract: According to one embodiment, a noise reduction system includes a microphone, a loudspeaker, and processing circuitry. The processing circuitry switches an operating mode between a control mode and a path characteristic measurement mode, includes a control filter that generates a control signal that causes the loudspeaker to output a control sound for reducing noise, based on a detection signal obtained by detecting a first sound including the noise with the microphone, measures a path characteristic including an acoustic characteristic between the loudspeaker and the microphone, and generates the control filter by using a measurement result of the path characteristic and a noise feature signal including a feature of the noise.

Abstract: According to one embodiment, a sound absorption device includes: a first plate having a plurality of first holes; a second plate facing the first plate in a first direction; a first frame connecting the first plate and the second plate; and a third plate supported by the first frame so as to vibrate in the first direction within the first frame. A first space is formed in the first frame between the first plate and the third plate. A second space is formed in the first frame between the second plate and the third plate. The third plate includes a first portion and a second portion, the second portion having a higher vibration speed than the first portion.

Abstract: According to an embodiment, a sound emitting apparatus includes a helical hollow tube and at least three sound wave sources. The helical hollow tube helically extends in a circumferential direction to form an annular shape as a whole. The first helical hollow tube includes a plurality of openings. The at least three sound wave sources are coupled to the first helical hollow tube and are configured to supply a sound wave to the first helical hollow tube.

Abstract: According to an embodiment, a sound emitting apparatus includes a vibrator, a holding part, and a fixing part. The holding part is configured to hold the vibrator. The fixing part is configured to fix the holding part. A stiffness of the fixing part is lower than a stiffness of the holding part.

Abstract: In general, according to one embodiment, a sound inspection apparatus includes: at least three microphones, a removing unit, and an estimation unit; the removing unit calculates an impulse response based on a sound pressure of a radiation sound collected via reference microphone and a first microphone, calculate an impulse response based on the sound pressure of the radiation sound collected via the reference microphone and a second microphone, and remove a component corresponding to the vibration sound from the calculated impulse response; the intensity calculation unit calculates an intensity of the radiation sound based on the impulse response from which the vibration sound is removed; the estimation unit estimates, based on the calculated intensity, a site where an abnormality in the inspection target object has occurred.

Abstract: According to one embodiment, an acoustic diagnostic apparatus includes an acoustic vibration unit, an acoustic vibration signal generation unit, a sound receiving unit, an impulse response calculation unit, an analysis unit, and a diagnostic unit. The vibration unit applies an acoustic vibration to a diagnosis target. The signal generation unit continuously inputs an acoustic vibration signal to the vibration unit. The receiving unit receives an evaluation target sound from the target, and output a sound reception signal. The calculation unit calculates an impulse response based on the sound reception signal. The analysis unit calculates an acoustic characteristic using the impulse response, and analyzes a state of the target. The diagnostic unit diagnoses the state of the target based on an analysis result of the analysis unit.

Abstract: According to one embodiment, an inspection apparatus includes a vibration sensor, a microphone, and a processor. The vibration sensor detects a vibration of an inspection target object to which the vibration is excited. The microphone arranged near the inspection target object and collects a radiated sound from the inspection target object. The processor calculates an impulse response between the vibration sensor and the microphone. The processor denoises an unnecessary component from the impulse response. The processor converts the impulse response into a frequency characteristic. The processor calculates acoustic energy between the vibration sensor and the microphone based on the frequency characteristic. The processor determine the presence/absence of an abnormal state of the inspection target object.

Abstract: According to an embodiment, a diagnostic apparatus includes a sound-emitting unit, at least one measurement unit, and a processor. The sound-emitting unit includes a plurality of speakers arranged at equal angular intervals on a circumference of a circle, and is configured to emit a first vibration sound to a target by using the speakers. The at least one measurement unit is arranged on a central axis of the circle, and is configured to measure a vibration of the target generated in response to the first vibration sound, or a second vibration sound radiated from the target due to the vibration. The processor is configured to diagnose the target based on an output from the at least one measurement unit.

Abstract: According to one embodiment, an acoustic diagnostic apparatus includes a speaker, a sound receiving unit, a positioning mechanism, first through third calculation units, and an evaluation unit. The speaker emits a sound wave to a diagnosis target. The sound receiving unit includes two microphones to receive a sound wave from the target. The positioning mechanism positions the sound receiving unit. The first calculation unit calculates impulse responses of the microphones. The second calculation unit calculates, based on the impulse responses, an intensity value on a measurement axis passing through the microphones. The third calculation unit calculates a sound absorption coefficient from the intensity value. The evaluation unit diagnoses the target by evaluating an acoustic characteristic based on a change in the sound absorption coefficient.

Abstract: According to one embodiment, a diagnostic method includes changing a position of a mechanical structure to be diagnosed with a drive unit based on an acceleration command, the acceleration command being generated based on a log swept sine (LOGSS) signal, calculating an impulse response based on the acceleration command and measured acceleration of the mechanical structure, the measured acceleration being measured by an accelerometer, analyzing at least one of a linear characteristic and a nonlinear characteristic relating to the mechanical structure based on the impulse response, and diagnosing the mechanical structure based on the at least one of the linear characteristic and the nonlinear characteristic relating to the mechanical structure.

Abstract: An online conversation management apparatus includes a processor. The processor acquires, across a network, reproduction environment information from at least one terminal that reproduces a sound image via a reproduction device. The reproduction environment information is information of a sound reproduction environment of the reproduction device. The processor acquires azimuth information. The azimuth information is information of a localization direction of the sound image with respect to a user of the terminal. The processor performs control for reproducing a sound image of each terminal based on the reproduction environment information and the azimuth information.