Abstract: A pickup diaphragm includes a pickup part, a suspension edge and an outer edge, wherein the pickup part includes a non-planar surface. The suspension edge includes a deformable surface, with a joint surface being respectively configured on the inner and outer sides of the deformable surface, and the joint surface on the inner side being fixedly connected to the periphery of the non-planar surface. In addition, the outer edge includes a ring groove, in which one side of the ring groove is set as a connection end while the other side thereof is set as an opening end, the inner side of the connection end is fixedly connected to the joint surface located on the outer side, and a stethoscope head can be inserted through the opening end such that the ring groove is placed in sleeve on the outside of the stethoscope head.

Abstract: A sound insulation plate includes a patterned frame and an elastic membrane, wherein the patterned frame includes a central pattern region and multiple peripheral pattern regions arranged around the central pattern region, the multiple peripheral pattern regions being separated from the central pattern region by a separation bar, and wherein the elastic membrane is mounted on the patterned frame to block passage of air and converts airborne sound waves into elastic waves.

Abstract: A tele-health apparatus includes a telephone having a microphone, an auscultation piece to acquire sounds, and a solid medium acoustically coupling the auscultation piece to the microphone. The auscultation piece is part of a stethoscope, and the solid medium is a windpipe of the stethoscope. The tele-health apparatus also includes an otoscope operable to be disposed in front of a camera of the telephone. A clip holds the stethoscope and the otoscope, and is fixed to the phone. Software modules installed in the telephone enable the tele-health apparatus to engage a user in a two-way audio and/or video consultation with a physician at a remote device in real-time.

Abstract: A panel coating system for simple and efficient installation of a removably attachable layer to a panel.

Abstract: An acoustic panel system is provided that includes a perforated first skin, a second skin and a core. The core is connected to the perforated first skin and the second skin. The core includes a plurality of chambers and a first constriction. Each of the chambers extends vertically through the core between the perforated first skin and the second skin. The chambers include a first chamber. The first constriction is configured to divide the first chamber into a plurality of fluidly coupled sub-chambers. The first constriction is configured from or otherwise includes a shape memory material.

Abstract: A high pass muffler for a pneumatic tool that allows for high pass through of exhaust air. The muffler dampens noise generated by the exhaust air by incorporating channels in walls of the muffler that act as Helmholtz resonators.

Abstract: A vibration reducing device is attached to a structure and blocks sound transmitted through the structure. The vibration reducing device includes a unit structure having a target frequency band, the unit structure including a plurality of unit cells, each formed of an acoustic meta-material and having a different target frequency, the unit cells being connected through first bridges; and a predetermined number of unit structures being connected through second bridges and attached to the structure, where each of the unit cells comprises: a mass portion of which a size is set according to the target frequency; a base frame formed as a quadrangular frame, the mass portion being eccentrically disposed in the base frame; and a support portion that connects the mass portion and the base frame, the support portion having a size that is set according to the target frequency.

Abstract: A silencing apparatus is provided with a shell, ventilation pipes communicating with the inside of the shell, insertion holes which are respectively formed in the shell so as to have sizes smaller than surrounding skirt parts and allow the ventilation pipes to be loosely inserted in, and partitions partitioning the inside of the shell. In the silencing apparatus, at least, a sound-absorbing chamber partitioned by the partition and positioned adjacent to the insertion hole is filled with a sound-absorbing fiber material, and a sound-absorbing fiber material filling gap between the insertion hole and the ventilation pipe is closed by an annular closing member. To provide a silencing apparatus allowing a sound-absorbing chamber to be filled with sound-absorbing fiber material without a gap, even in a complicated configuration having the inside of a shell partitioned by a partition.

Abstract: A sound attenuating cell includes a first sound attenuating cavity defined between a first sidewall and a second sidewall. The first sidewall is opposite the second sidewall. The first sidewall includes a first undulating surface and the second sidewall includes a second undulating surface. A deflector is coupled to the first undulating surface. The deflector extends from the first undulating surface toward the second undulating surface. The first undulating surface is axially offset from the second undulating surface to define a tortuous path between the first sidewall and the second sidewall. The first sound attenuating cavity has a first end and a second end. The first end is opposite the second end, and an inlet and an outlet of the first sound attenuating cavity is defined at the first end. The sound attenuating cell includes a second sound attenuating cavity nested within the first sound attenuating cavity.

Abstract: The present invention relates to a hose arrangement for creating a bubble curtain in bodies of water, comprising at least one air hose including an interior space enclosed by a wall, where a perforation consisting of individual punctures is introduced in the wall at least in an upper, first circumferential area, from which air can be discharged, when the interior space is pressurized, for creating a bubble curtain extending in the longitudinal direction of the air hose, and a ballast receptacle including a receiving area extending in the longitudinal direction, in which an elongated ballast element is received.

Abstract: A bilayler metamaterial silencer allows substantial fluid through the apparatus, while mitigating the propagation of sound through the apparatus, and while providing a form factor that is significantly more compact than previously-known devices. Moreover, illustrative embodiments allow a designer to specify one or both of the frequency or frequencies at which the apparatus mitigates sound propagation, and/or the bandwidth around the frequency or frequencies at which the apparatus mitigates sound propagation.

Abstract: A suppressor for a firearm is disclosed. The suppressor may have a hollow elongated body extending from a proximal end to a distal end. The suppressor may also have an expansion chamber disposed within the body. The expansion chamber may extend from adjacent the proximal end to a position between the proximal and distal ends. The suppressor may have a first plurality of vanes disposed in the expansion chamber. The first vanes may be laterally spaced apart from each other along a periphery of the body. The suppressor may further have a second plurality of vanes disposed in the body. The second plurality of vanes may be axially spaced apart from the first vanes. The tips of the first and second plurality of vanes may define a generally cylindrical passageway disposed coaxially with the body.

Abstract: Devices, assemblies, and methods for isolating a spoken command-controlled device from sound are disclosed herein. A sound-isolating device is provided to achieve this end. The sound-isolating device includes a base that supports the spoken command-controlled device and an enclosure that rests on the base and covers the spoken command device, in use. The base and enclosure are formed from sound-attenuating materials and, together, define a substantially sound-isolated volume.

Abstract: An air duct of an internal combustion engine has an inner pipe providing a flow channel and a housing with a first housing part and a second housing part, wherein the inner pipe is arranged in the housing. The first housing part and the second housing part enclose a chamber between the inner pipe and the housing. The inner pipe has at least one section with perforations in a wall of the inner pipe, wherein the perforations completely penetrate the wall of the inner pipe. A cylindrical acoustic component at least partially encloses the at least one section of the inner pipe at an outer side of the inner pipe. A wall of the cylindrical acoustic component is provided, at least in sections thereof, with continuous openings. The flow channel is acoustically connected via the perforations and via the continuous openings to the chamber.

Abstract: Systems and methods for occluding a duct and attenuating sound may be provided. In some embodiments, a system may include a toroidal component enclosing an interior volume. The interior volume may contain a fluid and may have an extended state and a retracted state. When the toroidal component is in the extended state, a distal portion of the toroidal component that defines a distal tip is configured to extend in a distal direction and a proximal portion of the toroidal component may define a proximal end of the toroidal component. When the toroidal component is in the retracted state, a portion of the inner surface may extend proximally beyond the proximal end of the toroidal component. A fluid composition and methods for attenuating sound may also be provided. In some embodiments, the fluid composition may be a suspension that includes an interstitial fluid and a plurality of gas-filled spheres.

Abstract: A moveable acoustical panel is disclosed for location on a surface comprising a frame having a lower support supporting an upper horizontal support by a first and a second vertical support. A first and second pair of support leg extends angularly from said first end of said frame with first and second plurality of rolling members secure thereto for enabling said frame to be moved along the surface. A flexible acoustical blocking material for blocking acoustical sound is secured to the supports.

Abstract: An acoustic resonator for a fan includes an annular shape internal volume defining by a housing, housing and internal volume are coaxial relative to the longitudinal axle of the acoustic resonator, internal volume comprises at least one coaxial helical channel, the at least one coaxial channel comprise an inlet and outlet corresponding to inlet and outlet of the acoustic resonator characterized in that the acoustic resonator comprises adjusting means provide for modified the length between inlet and outlet of the acoustic resonator according an acoustic frequency to lower noise.

Abstract: An acoustic insulation product includes a panel made of porous material, based on foam or fibres, including a first face, referred to as back face, intended to face towards a wall, and a second face, referred to as front face, situated on the opposite side to the back face, and a layer, referred to as backing layer, which adheres to or is linked or coupled at least in part to the back face of the panel made of porous material, the backing layer having an airflow resistance of between 5 kPa·s/m and 20 kPa·s/m.

Abstract: A reduction device includes a housing defining an input chamber configured to receive exhaust from a power source, an output chamber, an exhaust channel configured to direct the exhaust from the input chamber to the output chamber, and a longitudinal axis. The reduction device also includes a treatment unit disposed in the exhaust channel and along the longitudinal axis. The treatment unit is configured to at least partly remove pollutant species from the exhaust. The reduction device also includes an attenuation component disposed in the housing and radially outward of the treatment unit. The attenuation component is fluidly connected to the exhaust channel, and is configured to attenuate a range of frequencies corresponding to operation of the power source. Additionally, the exhaust channel prohibits exhaust entering the input chamber from exiting the housing without passing through the treatment unit.

Abstract: A mineral wool panel, intended to be used as an acoustic panel, has a surface density of greater than or equal to 3.2 kg/m2, an air flow resistivity of between 30 and 120 kPa·s/m2, and a Young's modulus of between 0.5 and 4 MPa.