Abstract: An enclosure (10) of a microphone unit (1) includes a mounting portion (11) which has a mounting surface (11a) where a first vibration portion (13) and a second vibration portion (15) are mounted and in which, in the back surface (11b) of the mounting surface (11a), a first sound hole (23) and a second sound hole (25) are provided; in the enclosure (10), a first sound path (41) is provided that transmits sound waves input through the first sound hole (23) to one surface of a first diaphragm (134) and that also transmits the sound waves to one surface of a second diaphragm (154) and a second sound path (42) is provided that transmits sound waves input through the second sound hole to the other surface of the second diaphragm (154).

Abstract: The disclosed substrate (12) has an electro-acoustic conversion element (11), which converts sound signals into electric signals, mounted thereon. Furthermore, the substrate is provided with: a mounting surface (12a) in which an opening (121) covered by the electro-acoustic conversion element (11) is formed; an intra-substrate space (122) connected to the opening (121); and a coating layer (CL) that covers at least part of the wall surface (122a) of the intra-substrate space (122).

Abstract: A sound signal transmitter-receiver includes a differential microphone for receiving sounds respectively at first and second points to convert the receiving sounds into a transmission sound signal; a transmission-reception unit for receiving an incoming signal as a reception sound signal; an addition unit for adding the reception sound signal from the transmission-reception unit and the transmission sound signal to produce an addition signal; and a speaker outputting sound based on the addition signal.

Abstract: A microphone unit includes first and second diaphragms; a substrate on a top surface of which are installed the first and second diaphragms; and a cover disposed covering the first and second diaphragms, the cover joined to an outside edge of the substrate and forming an internal space. There are formed in the substrate first and second openings that are formed respectively in the top and bottom surfaces of the substrate, and an internal sound path communicating from the first opening to the second opening. The first diaphragm is disposed on the substrate so as to cover and hide the first opening. The second diaphragm is disposed so as to seal off a partial region away from the first opening of the top surface of the substrate. A third opening is formed in the cover, and the internal space communicates to an outside space via the third opening.

Abstract: A microphone unit (1) comprises a first vibrating part (14), a second vibrating part (15), and a housing (20) for accommodating the first vibrating part (14) and the second vibrating part (15), the housing being provided with a first sound hole (132), a second sound hole (101), and a third sound hole (133). The housing (20) is provided with a first sound path (41) for transmitting sound pressure inputted from the first sound hole (132) to one surface (142a) of a first diaphragm (142) and to one surface (152a) of a second diaphragm (152), a second sound path (42) for transmitting sound pressure inputted from the second sound hole (101) to the other surface (142b) of the first diaphragm (142), and a third sound path (43) for transmitting sound pressure inputted from the third sound hole (133) to the other surface (152b) of the second diaphragm (152).

Abstract: A microphone unit (1) comprises a first vibrating part (14), a second vibrating part (15), and a case (10) for accommodating the first vibrating part (14) and the second vibrating part (15), the case being provided with a first sound hole (132) and a second sound hole (133). The case (10) is provided with a first sound channel (41) for transmitting acoustic pressure inputted from the first sound hole (132) to one surface (142a) of a first diaphragm (142) and to one surface (152a) of a second diaphragm (152), a second sound channel (42) for transmitting acoustic pressure inputted from the second sound hole (133) to the other surface (152b) of the second diaphragm (152), and a sealed space (5) that faces the other surface (142b) of the first diaphragm (142).

Abstract: A voice sound input apparatus, adapted to be inputted a sound and configured to output sound data, includes: a display unit; a first microphone, related to a first sound hole; a second microphone, related to a second sound hole; a signal processing unit; and a microphone holding unit, formed with the first sound hole, and adapted to extend toward a sound source predicted position; wherein a distance between the first sound hole and the second sound hole is a distance that a phase component of a sound strength ratio is lower than or equal to 0 dB, the sound strength ratio being a ratio between a strength of a sound component contained in differential sound pressure of sounds entered to the first sound hole and the second sound hole and a strength of sound pressure of the sound entered to the first sound hole.

Abstract: Disclosed is a differential microphone unit which can improve the characteristics of a microphone unit and widen the directional range thereof. The disclosed differential microphone unit (100) is provided with: a microphone housing (20) which is provided with a pair of first sound holes (22a, 22b) on the same major surface (20a); a vibrating portion (11) which is disposed in the microphone housing and which vibrates according to differences in sound pressure transmitted via each of the pair of first sound holes; and sealing members (30, 130), which are disposed on the major surface of the microphone housing and which each contain a pair of second sound holes (31a, 31b, 131a, 131b) disposed so as to be in respective contact with the pair of first sound holes.

Abstract: A sound input device includes a differential microphone, configured to receive sound including noise, and generate a first signal in accordance with the sound; a detector, configured to detect the noise, and generate a second signal in accordance with the detected noise; and a controller, configured to control at least one of suppression of high-frequency components of the first signal and changing of a frequency band to be suppressed of the first signal based on the second signal.

Abstract: A microphone unit includes: a housing which has an inner space; a partition member which is provided in the housing and divides the inner space into a first space and a second space, the partition member being at least partially formed of a diaphragm; and an electrical signal output circuit which outputs an electrical signal based on vibrations of the diaphragm. In the housing, a first through-hole through which the first space communicates with an outer space of the housing and a second through-hole through which the second space communicates with the outer space are formed.

Abstract: A microphone unit includes a substrate. The substrate includes a first face formed with a first recess, a second face opposite to the first face, and a through hole communicating the second face to a bottom part of the first recess. A diaphragm unit includes a diaphragm, and at least a part of which is disposed in the first recess so that the diaphragm opposes the through hole.

Abstract: A microphone unit includes: a housing which has an inner space; a partition member which is provided in the housing and divides the inner space into a first space and a second space, the partition member being at least partially formed of a diaphragm; and an electrical signal output circuit which outputs an electrical signal based on vibrations of the diaphragm. In the housing, a first through-hole through which the first space communicates with an outer space of the housing and a second through-hole through which the second space communicates with the outer space are formed.

Abstract: A main pipe is lined by a main pipe lining material comprising a resin pipe made of a thermoplastic resin. A flange of a lateral pipe lining material is formed of a material capable of being welded to the thermoplastic resin of the resin pipe of the main pipe lining material. The thermoplastic resins of the flange of the lateral pipe lining material and the resin pipe are heated for plastic welding by a heater to integrally join the flange of the lateral pipe lining material with the main pipe lining material. This prevents the ingress of underground water together with sediment into the main pipe from the section where the lateral pipe and the main pipe intersect.

Abstract: A voice input-output device includes a voice input section and a voice output section. The voice input section includes a microphone unit, the microphone unit including a housing that has an inner space, a partition member that is provided in the housing and divides the inner space into a first space and a second space, the partition member being at least partially formed of a diaphragm, and an electrical signal output circuit that outputs an electrical signal that is the first voice signal based on vibrations of the diaphragm, a first through-hole through which the first space communicates with an outer space of the housing and a second through-hole through which the second space communicates with the outer space being formed in the housing. The voice output section includes: an ambient noise detection section that detects ambient noise during a call based on the first voice signal; and a volume control section that controls volume of the speaker based on a degree of the detected ambient noise.

Abstract: A voice sound input apparatus, adapted to be inputted a sound and output sound data, includes: a first microphone, related to a first sound hole; a second microphone, related to a second sound hole; a signal processing unit, configured to perform a signal processing; and a wireless transmission unit, configured to transmit the sound data based on an output signal of the signal processing unit, wherein a distance between the first sound hole and the second sound hole is a distance that a phase component of a sound strength ratio is lower than or equal to 0 dB, the sound strength ratio being a ratio between a strength of a sound component contained in differential sound pressure of sounds entered to the first sound hole and the second sound hole and a strength of sound pressure of the sound entered to the first sound hole.

Abstract: A lateral pipe lining material having a flange on one end thereof is installed on a head collar which is hermetically mounted on a pressure bag that stores the lateral pipe lining material. The head collar comprises a curved section and a cylindrical section projecting from the curved section. An expandable member is mounted to the outer circumferential surface of the cylindrical section of the head collar, and expanded so that the outer circumferential surface of the expanding member comes into close contact with the inner circumferential surface near the flange, and the inner circumferential surface thereof comes into close contact with the outer circumferential surface of the cylindrical section of the head collar. This allows a hermetical connection between the lateral pipe lining material and the head collar and ensures a reliable eversion and insertion of the lining material into a lateral pipe.

Abstract: A microphone system, includes: a housing, adapted to be placed in a reference position relative to a sound source; a first microphone, configured to receive sound from the sound source at a first position within the housing; a second microphone, configured to receive sound from the sound source at a second position within the housing; and a differential signal generator, wherein: the first and second positions are arranged on a first line; and the first line perpendicularly intersects a second line that is extended from the sound source at a third position which is not between the first and second positions, and obliquely intersects a third line that is extended from the sound source at a fourth position which is between the first and second positions, when the housing is placed at the reference position.

Abstract: Disclosed is a microphone unit (1) including: an electroacoustic conversion section (13) that converts sound pressure to an electrical signal; a casing (11) that accommodates the electroacoustic conversion section (13); and a cover (12) that covers the casing (11) and is provided with a first acoustic opening (121) and a second acoustic opening (122). The casing (11) consists of a laminated substrate comprising integrated laminated layers. The casing (11) is provided with: a concave space (111) in which the electroacoustic conversion section (13) is mounted and which communicates with the first acoustic opening (121), and a hollow space (121) that provides communication between a bottom face (111a) of the concave space and the second acoustic opening (122).

Abstract: A microphone unit includes: a partition member, including a vibration film configured to be vibrated by sound; a housing, defining an inner space, and formed with a first opening and a second opening, the inner space being divided into a first space and a second space by the partition member, the first space adapted to be communicated with an outer space via the first opening, and the second space adapted to be communicated with the outer space via the second opening; and a shutter, configured to close one of the first and second openings; and an amplifier, configured to: amplify an electric signal at a first gain when the shutter closes the one of the first and second openings; and amplify the electric signal at a second gain that is larger than the first gain when first and second openings are opened.

Abstract: Disclosed is a microphone unit comprising a film substrate (1), electrically conductive layers (15, 16) which are formed on both substrate surfaces of the film substrate (11), and an electrical acoustic transducer unit (12) which is provided on the film substrate (11) and comprises a diaphragm capable of converting a sound pressure to an electrical signal. In the microphone unit, the linear expansion coefficient of the film substrate (11), including the electrically conductive layers (15, 16), falls within the range of 0.8 to 2.5 times, inclusive, the linear expansion coefficient of the diaphragm.