Abstract: Provided is a technique to generate a call environment that prevents call contents from being heard by a person other than a person speaking on the phone in a case where call voice is output from a speaker. Speakers installed in an automobile are denoted by SP1, ..., SPN, a first filter coefficient used to generate an input signal for a speaker SPn is denoted by Fn (?), and a second filter coefficient that is different from the first filter coefficient and is used to generate an input signal for the speaker SPn is denoted by ~Fn (?).

Abstract: Provided is a technique for selecting a cancellation filter coefficient that can stably cancel noise for a user using a seat of an aircraft, an automobile, or the like. A cancellation filter coefficient selection apparatus includes: a recording unit configured to record cancellation filter coefficients; a seat position acquisition unit configured to acquire a position of a seat used by a user; and a cancellation filter coefficient selection unit configured to, from among the cancellation filter coefficients recorded in the recording unit, select a cancellation filter coefficient corresponding to the position of the seat as a cancellation filter coefficient to be used in filtering for generating a cancellation signal for cancelling noise at a position where quiet is desired, based on a reference signal output by a reference microphone configured to collect noise in a predetermined space.

Abstract: A sound system, for a user using a seat of an aircraft, an automobile, or the like, that reproduces sound inaudible to users around, without using earphones or headphones, is provided. A sound system for a user using a seat of an aircraft includes: a reproduction apparatus including an n-th reproduction unit (n = 1, ..., N) that outputs a (2n - 1)-th sound signal that is a sound signal obtained based on a subject to be reproduced, and a 2n-th sound signal that is a sound signal with opposite phase to phase of the (2n - 1)-th sound signal, N being an integer equal to or larger than one; and a speaker system including an n-th speaker unit pair (n = 1, ..., N) including a speaker unit that emits sound based on the (2n - 1)-th sound signal (hereinafter, referred to as the positive speaker unit) and a speaker unit that emits sound based on the 2n-th sound signal (hereinafter, referred to as the negative speaker unit), the speaker system being installed at a place close to a head of the user using the seat.

Abstract: Provided is a sound collection loudspeaker apparatus that makes it possible to intuitively distinguish which talker is talking, and improve the comfort of conversations, when performing in-vehicle conversation and conversations with people outside of a vehicle. The sound collection loudspeaker apparatus is installed in a vehicle. Two or more sound collection and amplification positions are assumed to be present inside the vehicle.

Abstract: A speaker system that reproduces sound inaudible to users around, without using earphones, headphones, or a large-scale speaker array, is provided. Assuming that N is an integer equal to or larger than one, and that a (2n?1)-th sound signal (n=1, . . . , N) is a sound signal obtained based on a subject to be reproduced, a speaker system that emits sound based on a first sound signal, . . . , and sound based on a (2N?1)-th sound signal such that the sound is heard only in a vicinity, includes an n-th speaker unit pair (n=1, . . . , N) including a speaker unit that emits sound based on the (2n?1)-th sound signal (hereinafter, referred to as the positive speaker unit) and a speaker unit that emits sound based on a 2n-th sound signal that is a sound signal with opposite phase to phase of the (2n?1)-th sound signal (hereinafter, referred to as the negative speaker unit).

Abstract: There are included a first speaker processing step in which a first speaker 2 produces sound based on a first filtered signal, a gain multiplication step in which a gain multiplication unit 4 generates a gain multiplied signal by multiplying a second filtered signal by a gain, a second speaker processing step in which a second speaker 5 produces sound based on the gain multiplied signal, and a gain control step in which a gain control unit 7 controls the gain such that a root mean square of a collected sound signal collected by a microphone 6 installed at a mute position, which is a position at which the sound produced by the first speaker and the sound produced by the second speaker are to be muted, is relatively small.

Abstract: A vibration cancellation method is a vibration cancellation method for canceling vibration arriving at a seat from outside of the seat, the vibration being transmitted to a user seated in the seat. The method includes canceling, by a vibration cancellation unit (4), a vibration by outputting a cancellation signal from a position close to a position where user's head is placed when a user is seated, the cancellation signal being obtained based on a reference signal and an error signal. The reference signal is obtained by a vibration sensor (2) disposed in a position close to a vibration source outside the seat in the seat, and the error signal is obtained by an error vibration sensor (3) disposed in the position close to the position where user's head is placed when the user is seated in the seat.

Abstract: The present invention provides a technology of efficiently collecting abnormal state data important in a safety function or automatic driving. A collection system includes a passenger sensor unit configured to sense the passenger; and a determination acquisition unit configured to acquire abnormality data from data related to a vehicle and not to the passenger based on sensor information which is data acquired by the passenger sensor unit. The determination acquisition unit determines a danger based on an action taken by a person who senses the danger or changing biological information, and acquires data acquired by the sensor for a time in which the danger is determined and a time with a predetermined length continuing before or after the time as the abnormality data.

Abstract: A conversation assisting method of the present invention is performed in a first space in order to transmit an acoustic signal between the first space and a second space, separated by an isolation object, by using the isolation object. In the conversation assisting method of the present invention, a sound to be transmitted to the second space is emitted from the first space side to the isolation object at a predetermined intensity. Further, in the conversation assisting method of the present invention, a sound transmitted through the isolation object is picked up, and from the picked-up sound, a sound except for the emitted sound is emphasized and output.

Abstract: A technology is provided that reduces noise heard when a user sits in a seat of an aircraft, without using earphones or headphones. A sound system includes: a control system that generates a control signal for canceling noise in a place close to a head of a user using a seat of an aircraft, from a signal of the noise (noise signal); and a noise-cancellation speaker system including speaker units that emit sound based on the control signal (first noise-cancellation speaker unit, . . .

Abstract: A notification method is a notification method of providing a notification of a warning indicating that an infant is left unattended in an automobile, the notification method including: a detection step of detecting, by a detection unit 1, whether the infant is left unattended; and a notification step of providing, by a notification unit 2, the notification of the warning when the infant is left unattended. The detection step includes detecting that the infant is left unattended when at least both of a case where a door used by a driver of the automobile is closed after being opened and a case where the driver is not in a driver's seat of the automobile are satisfied within a time frame and the infant is in the automobile.

Abstract: A reproduction apparatus that realizes reproduction of which sound leakage is small with use of a speaker installed near a head, and a method and a program thereof are provided. The reproduction apparatus is used in a seat. The reproduction apparatus includes: at least two speakers; an acquisition unit that acquires, from a predetermined sound source, an acoustic signal of which sound is emitted by the reproduction apparatus; and a control unit that controls the acoustic signal acquired by the acquisition unit such that reproduction sound is only transmitted to a first seat and the reproduction sound is not transmitted to a second seat, the speakers each emit sound of the acoustic signal controlled by the control unit, and the speakers are disposed so as to be closer to an ear of a user that sits in the first seat than to the second seat.

Abstract: The sound source position determination device includes a first microphone that is disposed at a position at which sound arriving from inside the closed space is likely to be picked up, a second microphone that is disposed at a position at which sound arriving from outside the closed space is likely to be picked up, a power ratio calculation unit that calculates a power ratio of an acoustic signal picked up by the first microphone during a predetermined time section to an acoustic signal picked up by the second microphone during the time section, and a determination unit that determines whether sound picked up during the time section came from inside or outside the closed space, based on the power ratio.

Abstract: A sound collecting apparatus includes a base of a substantially spherical body and a plurality of microphones provided on the base, a number of the microphones having a predetermined constraint, the plurality of microphones being alternately arranged vertically relative to a horizontal plane including a center of the substantially spherical body in order to improve resolution in a horizontal direction.

Abstract: Provided is a sound pickup loudspeaker apparatus which suppresses the influence of feedback produced when adding a speaker while also reducing a sense of unnaturalness in a sound image. The sound pickup loudspeaker apparatus collects a target sound emitted from a first seat in the vehicle, plays back the collected target sound to a listener seated in a second seat in the vehicle from a second sound amplifying device disposed in a direction different from the first seat from the perspective of the listener, and furthermore plays back the collected target sound to the listener from a first sound amplifying device disposed in the same direction as the first seat from the perspective of the listener.

Abstract: A sound collection apparatus includes a substantially spherical base on which at least a predetermined number of recess portions are provided in a surface thereof with a predetermined interval therebetween; and a predetermined number of microphones. The predetermined number is an integer of 2 or greater. The microphones are installed on an inner bottom surface side of the recess portions one by one. Intervals between sound collecting portions of adjacent microphones are substantially equal to each other.

Abstract: A first noise level, which is an estimated value of a magnitude of a noise component included in a first sound collection signal obtained from a first microphone which collects sound emitted from a first sound collection and amplification position is obtained, a second noise level, which is an estimated value of a magnitude of a noise component included in a second sound collection signal obtained from a second microphone which collects sound emitted from a second sound collection and amplification position is obtained, a ratio of a reproduced noisy sound level, which is an estimated value of a magnitude of noise at a position of a passenger at the second sound collection and amplification position in a case where the first noise level is reproduced from a second speaker placed at the second sound collection and amplification position, with respect to a second noisy sound level, which is an estimated value of a magnitude of noise corresponding to the second noise level at the position of the passenger at the

Abstract: An object is to provide a sound collection apparatus capable of collecting a sound with a higher SN rate than before through use of a reflected sound. The sound collection apparatus is installed in a vehicle. The vehicle includes a seat for a passenger to sit on, and a reflective structure that reflects a sound emitted by a passenger sitting in the seat. The sound collection apparatus includes a first microphone arranged at a position where a direct sound that is a sound emitted by the passenger is readily collected, and a second microphone arranged at a position where a reflected sound that is a sound emitted by the passenger and reflected by the reflective structure is readily collected.

Abstract: Sounds arriving from outside of a mobile body are collected by a microphone disposed inside the mobile body. A sound collecting apparatus according to the present disclosure is attached to the mobile body. The sound collecting apparatus according to the present disclosure includes a microphone that is directly or indirectly in contact with an outer face member, which is a member forming an outer face of the mobile body, from an inner side of the mobile body and collects sounds propagating through the outer face member. In a case where the microphone has directivity, the microphone is disposed in a direction in which sounds propagating from the outer face of the outer face member to the inner side are collected. The outer face member is, for example, glass.

Abstract: Audibility of an outside sound needed for a driver inside an automobile to apprehend a danger and obtain a grasp of a situation necessary for driving is improved. A sound collection and emission apparatus (10) emits, on the basis of an outside acoustic signal which emanates from a sound source outside an automobile (90) and arrives at the automobile (90), an inside acoustic signal which is an acoustic signal derived from the outside acoustic signal to inside the automobile (90). A sound collection unit (M1) collects the outside acoustic signal. A sound emission unit (S1) emits the inside acoustic signal. A danger sound detection unit (11) determines whether the outside acoustic signal has a feature representing a danger defined in advance. A control unit (12) performs control that emits the inside acoustic signal from the sound emission unit (S1) such that a driver of the automobile (90) is capable of perceiving the danger if the outside acoustic signal is determined to represent the danger.