Abstract: A sound pickup device includes a diaphragm that vibrates according to an acoustic pressure of input sound, an acoustic member having a sound channel formed to guide sound to the diaphragm, and a Helmholtz resonator having an opening formed in a wall surface surrounding the sound channel, in which the diaphragm is disposed inside a microphone in which a sound hole is formed, the acoustic member includes: a first substrate that has a through hole formed at the same position as the sound hole, and is attached to the microphone; and a second substrate that has the sound channel formed at a position corresponding to the through hole, and is attached to the first substrate.

Abstract: An action estimation device includes: an obtainer that obtains sound information pertaining to an inaudible sound, the inaudible sound being a sound in an ultrasonic band collected by a sound collector; and an estimator that estimates an output result, obtained by inputting the sound information obtained by the obtainer into a trained model indicating a relationship between the sound information and action information pertaining to an action of a person, as the action information of the person.

Abstract: An occupied seat detection device includes: at least one receiver that is disposed in a space including a plurality of seats and receives at least one of sound generated inside the space or sound generated outside the space; an acoustic characteristics analyzer that calculates, from a signal received by the at least one receiver, temporal characteristics or frequency characteristics of the sound in the space; and a detector that detects whether an occupant is present or whether an occupied seat is present inside the space, based on the temporal characteristics or the frequency characteristics calculated by the acoustic characteristics analyzer, and outputs a detection result.

Abstract: An optical microphone includes: a light source; a first optical divider dividing light from the light source into reference light and measurement light; a second optical divider dividing the measurement light into N measurement light beams; a first emitter emitting the N measurement light beams from different positions toward a predetermined space; a first light receiver receiving the N measurement light beams having propagated through the space; a third optical divider dividing the reference light into N reference light beams; N optical couplers coupling the N measurement light beams with the N reference light beams on a one-to-one basis; N optical detectors receiving N coupled light beams and each detecting interference between the measurement light beam and the reference light beam in the corresponding coupled light beam; and a controller controlling directionality of sound pickup by performing signal processing on N detection signals from the N optical detectors.

Abstract: A paper jam indication detection device is a paper jam indication detection device that detects an indication that a paper jam will occur in a paper feed device, the paper jam indication detection device including: a sound collector that collects a friction sound produced by friction between a plurality of sheets of paper when the paper is fed from a holder holding the plurality of sheets of the paper; an indication detector that detects an indication that a paper jam will occur in the paper feed device based on a decrease in the friction sound collected by the sound collector; and a signal outputter that, when the indication is detected by the indication detector, outputs, to the paper feed device, a signal for stopping the paper from being fed from the holder.

Abstract: An unmanned aircraft includes: rotor blades; a duct that shrouds the rotor blades and through which airflow generated by rotation of the rotor blades passes; and a processor that controls rotation of the rotor blades. The height to width ratio of an inner space of the duct in which the rotor blades are shrouded is at least 0.5.

Abstract: An earbud includes: a speaker unit which generates a sound wave; a first housing which houses the speaker unit, and has a first opening which faces a sound wave generation surface of the speaker unit; a sound conduit having one end connected to the first opening; an ear plug which is attached to the other end of the sound conduit, the ear plug being inserted into the ear canal; and an air conduit which is disposed so as to penetrate the ear plug and the first housing, the air conduit being disposed independently from the sound conduit.

Abstract: A speaker device includes a speaker that outputs sound, a horn that emits sound output from the speaker, and a slit opening that is formed on a front surface of the horn, a vertical side of the slit opening being longer than a horizontal side of the slit opening. It is possible to prevent reflection of unnecessary sound in a vertical direction and enhance sound reproduction performance in a horizontal direction.

Abstract: A speaker device includes a speaker that outputs sound, a horn that emits sound output from the speaker, and a slit opening that is formed on a front surface of the horn, a vertical side of the slit opening being longer than a horizontal side of the slit opening. It is possible to prevent reflection of unnecessary sound in a vertical direction and enhance sound reproduction performance in a horizontal direction.

Abstract: Provided is an area reproduction system including a reproduction unit including a speaker array, a processing unit that processes a reproduction sound to be output from each of a plurality of speakers included the speaker array, based on a control line including a reproduction line that strengthens a sound wave radiated from the speaker array and a non-reproduction line that weakens the sound wave, so that an audio beam of a predetermined sound pressure or more is radiated only to the reproduction line, the control line being substantially parallel with the speaker array and being set in a position separated from the speaker array, and a directional angle control unit that adjusts a phase of the reproduction sound so that a radiating direction of the audio beam is deflected by a specified angle, in which each of the plurality of speakers outputs the processed and adjusted reproduction sound.

Abstract: A speaker system includes a speaker unit that outputs sound, a cabinet having a wall to which the speaker unit is attached, and an acoustic transmission tube that is disposed inside the cabinet and has an open end and a closed end, the acoustic transmission tube having an aperture in a side wall.

Abstract: Provided is an area reproduction system including a reproduction unit including a speaker array, a processing unit that processes a reproduction sound to be output from each of a plurality of speakers included the speaker array, based on a control line including a reproduction line that strengthens a sound wave radiated from the speaker array and a non-reproduction line that weakens the sound wave, so that an audio beam of a predetermined sound pressure or more is radiated only to the reproduction line, the control line being substantially parallel with the speaker array and being set in a position separated from the speaker array, and a directional angle control unit that adjusts a phase of the reproduction sound so that a radiating direction of the audio beam is deflected by a specified angle, in which each of the plurality of speakers outputs the processed and adjusted reproduction sound.

Abstract: Provided is a loudspeaker device that can improve sound quality. The loudspeaker device includes: a loudspeaker housing; a first loudspeaker unit provided in a first wall of the loudspeaker housing; and an acoustic tube communicating an inside and an outside of the loudspeaker housing to each other. The acoustic tube has a predetermined length, and is accommodated in the loudspeaker housing and is helically shaped.

Abstract: A speaker system has a speaker array including a plurality of first speakers and a first filter array. A peak of the directivity of reproduced sounds output from the speaker array. And the peak being in a direction in which the plurality of first speakers are arranged, is shifted toward a wall surface due to first filter processing performed by the first filter array.

Abstract: A speaker device includes a first speaker unit, a first cabinet that houses the first speaker unit, and an annular portion defining a sound path that guides sound radiated from the first speaker unit to outside the first cabinet, the annular portion being positioned on a sound radiation side of the first speaker unit and arranged so as to sound a diaphragm in the first speaker unit. The speaker device also includes a second cabinet arranged inside the annular portion and spaced apart from the sound path, the sound path being annular, and a second speaker unit that radiates sound in a direction in which the first speaker unit radiates sound and that is stored in the second cabinet. The speaker device further includes a resonant portion having an aperture communicating with the sound path and defining a resonant space.

Abstract: A speaker system includes a speaker unit that outputs sound, a cabinet having a wall to which the speaker unit is attached, and an acoustic transmission tube that is disposed inside the cabinet and has an open end and a closed end, the acoustic transmission tube having an aperture in a side wall.

Abstract: A speaker system has a speaker array including a plurality of first speakers and a first filter array. A peak of the directivity of reproduced sounds output from the speaker array. And the peak being in a direction in which the plurality of first speakers are arranged, is shifted toward a wall surface due to first filter processing performed by the first filter array.

Abstract: A speaker device includes a first speaker unit, a first cabinet that houses the first speaker unit, an annular portion defining a sound path that guides sound radiated from the first speaker unit to outside the first cabinet, the annular portion being positioned on a sound radiation side of the first speaker unit and arranged so as to sound a diaphragm in the first speaker unit, a second cabinet arranged inside the annular portion and spaced apart from the sound path, the sound path being tubular, a second speaker unit that radiates sound in a direction in which the first speaker unit radiates sound and that is stored in the second cabinet, and a resonant portion having an aperture communicating with the sound path and defining a resonant space.

Abstract: A loudspeaker device includes: a plurality of loudspeaker units; and a plurality of horns provided in the plurality of loudspeaker units, respectively, the plurality of horns each restricting spread of sound output from a corresponding one of the loudspeaker units to a predetermined range.

Abstract: A loudspeaker device includes: a loudspeaker housing; a first loudspeaker unit provided in a first wall of the loudspeaker housing; and an acoustic tube communicating an inside and an outside of the loudspeaker housing to each other. The acoustic tube has a predetermined length, and is accommodated in the loudspeaker housing while spirally bent.