Abstract: A sound control system includes a seat including a seating part and a backrest part configured to be reclined with respect to the seating part, a first speaker disposed on the backrest part, a peripheral wall disposed to surround at least a part of a periphery of the seat, a microphone disposed on an upper portion of the peripheral wall, and a processor. The processor controls a playback level of sound reproduced by the first speaker based on (i) environmental sound collected by the microphone and (ii) an orientation of the backrest part.

Abstract: A signal processing method is executed by a signal processing device connected to a radio device that transmits radio waves in given periods and receives reflection waves, to process signals of the reflection waves. The signal processing method includes: obtaining positional information on a moving object at respective times based on the signals of the reflection waves; identifying a coordinate that is a coordinate in an axis in a transmission direction of the radio waves, and satisfies an end condition of a gesture from among the obtained positional information at the respective times; and extracting a group of consecutive coordinates including the identified coordinate as an end point.

Abstract: A sound reproduction device is configured to store a head of a user and reproduce sound. The sound reproduction device includes: a headrest portion; a partition portion attached to the headrest portion so as to protrude forward relative to a front surface of the headrest portion; a speaker disposed in the partition portion; and a sound absorbing structure provided in at least a part of the inner surface of the partition portion excluding a region corresponding to an output surface of the speaker.

Abstract: An arithmetic device executes a method for acoustic adjustment including: setting an initial value of a gain value of a preamplifier based on a difference between energies of the test sound source before and after correction by an equalizer to an input sound; amplifying a volume of the test sound source by the preamplifier using the initial value, calculating a loudness value and a clipping occurrence rate of the test sound source corrected by the equalizer, and determining whether calculation results of the loudness value and the clipping occurrence rate are each less than a predetermined threshold; and reducing the initial value of the gain value by a specified value in a case where the calculation result of the loudness value or the clipping occurrence rate is equal to or greater than the predetermined threshold.

Abstract: A sound reproduction device is configured to store a head of a user and reproduce sound. The sound reproduction device includes: a headrest portion; a partition portion attached to the headrest portion so as to protrude forward relative to a front surface of the headrest portion; a speaker disposed in the partition portion; and a sound absorbing structure provided in at least a part of the inner surface of the partition portion excluding a region corresponding to an output surface of the speaker.

Abstract: An arithmetic device executes a method for acoustic adjustment including: setting an initial value of a gain value of a preamplifier based on a difference between energies of the test sound source before and after correction by an equalizer to an input sound; amplifying a volume of the test sound source by the preamplifier using the initial value, calculating a loudness value and a clipping occurrence rate of the test sound source corrected by the equalizer, and determining whether calculation results of the loudness value and the clipping occurrence rate are each less than a predetermined threshold; and reducing the initial value of the gain value by a specified value in a case where the calculation result of the loudness value or the clipping occurrence rate is equal to or greater than the predetermined threshold.

Abstract: A communication assist device includes an information reception unit that receives a message transmitted from a passenger terminal owned by a passenger in a moving body, a moving body identification unit that identifies the moving body based on passenger information which is included in the message received by the information reception unit and by which the passenger is able to be identified, and an information transmission unit that transmits the passenger information and information related to the message in association with each other to a communication device provided to the moving body identified by the moving body identification unit. The information reception unit, the moving body identification unit, and the information transmission unit are provided outside the moving body.

Abstract: A signal processing method is executed by a signal processing device connected to a radio device that transmits radio waves in given periods and receives reflection waves, to process signals of the reflection waves. The signal processing method includes: obtaining positional information on a moving object at respective times based on the signals of the reflection waves; identifying a coordinate that is a coordinate in an axis in a transmission direction of the radio waves, and satisfies an end condition of a gesture from among the obtained positional information at the respective times; and extracting a group of consecutive coordinates including the identified coordinate as an end point.

Abstract: A sound reproduction device is configured to store a head of a user and reproduce sound. The sound reproduction device includes: a headrest portion; a partition portion attached to the headrest portion so as to protrude forward relative to a front surface of the headrest portion; a speaker disposed in the partition portion; and a sound absorbing structure provided in at least a part of the inner surface of the partition portion excluding a region corresponding to an output surface of the speaker.

Abstract: A communication assist device includes an information reception unit that receives a message transmitted from a passenger terminal owned by a passenger in a moving body, a moving body identification unit that identifies the moving body based on passenger information which is included in the message received by the information reception unit and by which the passenger is able to be identified, and an information transmission unit that transmits the passenger information and information related to the message in association with each other to a communication device provided to the moving body identified by the moving body identification unit. The information reception unit, the moving body identification unit, and the information transmission unit are provided outside the moving body.

Abstract: An acoustic apparatus includes the peripheral wall which is provided so as to surround the seat and in which the upper portion is opened, and the speakers which are provided inside the peripheral wall so as to face the seat and can output the reproduced sound from the sound source. The speakers are disposed in front of the ears of a person sitting on the seat.

Abstract: An acoustic control system includes a peripheral wall provided so as to surround a seat, and an upper portion of the peripheral wall being opened, a speaker provided inside the peripheral wall and capable of outputting a reproduced sound from a sound source, a microphone provided toward an outside of the peripheral wall and configured to collect an environmental sound around the peripheral wall, and a processor. The processor configured to suppresse a level of the reproduced sound in a predetermined frequency band from the speaker based on the environmental sound collected by the microphone.

Abstract: An acoustic control system includes a peripheral wall provided so as to surround a seat, and an upper portion of the peripheral wall being opened, a speaker provided inside the peripheral wall and capable of outputting a reproduced sound from a sound source, a microphone provided toward an outside of the peripheral wall and configured to collect an environmental sound around the peripheral wall, and a processor. The processor configured to suppresse a level of the reproduced sound in a predetermined frequency band from the speaker based on the environmental sound collected by the microphone.

Abstract: An acoustic apparatus includes the peripheral wall which is provided so as to surround the seat and in which the upper portion is opened, and the speakers which are provided inside the peripheral wall so as to face the seat and can output the reproduced sound from the sound source. The speakers are disposed in front of the ears of a person sitting on the seat.