Abstract: The present invention provides methods and devices for the abatement of noise emanating from surgically created abdominal stomas. In one embodiment, the present invention provides a sound abatement device for an abdominal stoma. The device includes a noise suppressor formed of sound dampening material, which defines an opening and cavity suitable in size and shape for receiving and enveloping a stoma formed through a body wall of an individual. The device further includes a support arm extending from the noise suppressor, which includes a first end connected to the noise suppressor and a second end disposed opposite thereof. The device further includes a base member disposed proximate the second end of the support arm, which includes an attachment for connection to an individual. The device also includes an attachment feature for releasable attachment of the second end of the support arm to the base.

Abstract: Composite loudspeaker cones that include an interstitial layer of material having a core density below 600 kg/m3 and a Young's modulus greater than 0.2 GPa, such as balsa wood, interposed between a first carbon fiber layer and a second carbon fiber layer and method of making same.

Abstract: Methods and devices for sound isolation are provided. A sound isolation device includes an expandable element and an insertion element. The expandable element is operatively attached to the insertion element. The expandable element includes an expanding medium, where the pressure of the expanding medium is varied to vary a sound isolation across the expandable element.

Abstract: A soot preventing type tail trim may include a tail pipe discharging exhaust gas, and a body enclosing an outer circumference of the tail pipe with a predetermined space therebetween, such that wind may be allowed to flow into the predetermined space and to be discharged therefrom to generate a separation layer in the exhaust gas passing the tail pipe by the wind.

Abstract: A firearm suppressor for mounting on a firearm to suppress sound emanating from the firearm when fired may comprise a housing defining an interior and a baffle insert positioned in the interior of the housing. The baffle insert may have at least two baffle wall portions dividing the interior of the housing into at least three baffle chambers, with the baffle wall portions being spaced from each other in a longitudinal direction of the insert. The baffle insert may define a central longitudinal passage for a projectile fired from the firearm to pass through the insert. The baffle insert may define a convoluted passage for combustion gases to pass through the insert, with the convoluted passage being distinct from the longitudinal passage. The convoluted passage may be in communication with the central longitudinal passage and may be defined by at least one auxiliary hole extending through the baffle wall portions.

Abstract: A monolithically fabricated sound absorbing structural precast concrete noise barrier panel comprising a sound absorbing layer of specialized raw materials. The raw materials include wood particles as well as granulated rubber.

Abstract: A muffler (1) for an exhaust system (2) of an internal combustion engine, especially of a motor vehicle, with a muffler housing (3), which encloses a housing interior space (5), and with at least one exhaust gas-carrying hollow body (4) with two half shells in a half shell construction. The hollow body is arranged in the housing interior space (5). The two half shells (14, 15) of the hollow body (4) are fastened to one another in the area of a separating plane (16). The assembly of the muffler (1) or of the hollow body (4) can be simplified if the two half shells (14, 15) are fastened to one another by fastening elements (17, 18), which are formed directly on the half shells (14, 15).

Abstract: A silencer device for a hair dryer comprises a container structure (2) exhibiting a plurality of inlet openings (8), an outlet opening (9) and a conduit (10) connecting the inlet (8) and outlet (9) openings to one another and further comprising a ring (14) made of sound-absorbent material, inserted in the conduit (10) such as to interfere with a flow of air between the inlet openings (8) and the outlet (9) opening in such a way as to at least partly attenuate sound vibrations associated to the air flow. The inlet openings (8) are made on a lateral wall (6) of the container structure (2) and face the axis (X) such as to define an air flow along a first transversal direction to the axis (X) such as to define a flow of air along a first transversal direction to the axis (X), and deviating means (12) arranged in the conduit (10) impress an axial deviation along the axis (X) on the air flow coming from the inlet openings (8).

Abstract: The soundproofed exhaust duct for a turbine engine comprises a perforated inner shell defining a flow passage, and a solid outer shell, the inner and outer shells defining between them a space that is closed at the upstream and downstream ends of said space. A core extends between the inner and outer shells at a distance therefrom, and contains at least one sound energy dissipating layer made up of hollow beads that are held against one another. A frame with upstream and downstream portions connected together by longitudinal members supports the core and partitions it into a plurality of boxes that are filled with hollow beads that are held between perforated textures, the frame being secured to the outer shell and/or to the inner shell via at least one of its upstream and downstream portions.

Abstract: This invention is directed to a composite laminate comprising in order (a) a flame retardant polymeric moisture barrier (b) an inorganic platelet layer and (c) a flame retardant thermoplastic film layer The invention is also directed to a thermal insulation and acoustic blanket comprising a core of fibrous material or foam surrounded by the above composite laminate wherein the thermoplastic film layer of the composite laminate contacts and encapsulates the core.

Abstract: A method of forming a monolithically fabricated sound absorbing structural precast concrete noise barrier panel comprising a sound absorbing layer of specialized raw materials. The method includes providing a sound absorbing layer that is a blended mixture of an aggregate, granulated rubber, chemically treated wood particles, cement, pozzolans, water, air entraining admixture, and water reducing mixture; placing the sound absorptive layer ingredients in a form mold; compressing the ingredients to a preset density; backing the compressed ingredients with reinforced structural concrete; and curing the backed and compressed ingredients.

Abstract: An enclosure for housing a transducer and electronics for disposal on a downhole tool. A transducer is disposed at an angle with respect to a longitudinal axis of the enclosure, wherein the enclosure contains a fluid surrounding the transducer. Enclosures also include transducers linked to motor means for selective rotation of the transducers within the enclosure. Enclosures with transducer arrays for phased or targeted signal transmission/detection.

Abstract: A slender-type diaphragm longer in a longitudinal direction and shorter in a transversal direction in relation to the longitudinal direction, has a base member and a slant member. The base member has a pair of extending members provided in parallel in the longitudinal direction as facing each other, and a curved section that protrudes toward a first side of the diaphragm in a vibration direction of the diaphragm from a first plane that includes the extending members, the vibration direction being perpendicular to the longitudinal and transversal directions. The slant member has a slant surface in relation to the first plane and connected to the base member in a manner that the slant member surrounds the base member in a second plane parallel to the first plane, the slant member having a curved surface in a cross section thereof in relation to a cross section of the base member in the transversal direction.

Abstract: A loudspeaker enclosure accommodates at least one speaker. Sound waves emanating from the rear of the speaker exit through a port in the enclosure. The interior of the enclosure contains at least one partition to lengthen the acoustic path from the rear of the speaker to the port and to cause alternating expansion and contraction of the sound waves emanating from the rear of the speaker. The partitions are arranged in relation to the speaker(s) so as to reduce sound wave reflections that would create non-linearities in the frequency response.

Abstract: A pen based computing system concurrently captures handwriting gestures and records audio using binaural recording. A binaural headset communicatively coupled to the smart pen device uses at least two microphones. A left microphone is placed in or near the left ear and the right microphone is placed in or near the right ear, each facing outward. Speakers are integrated into a shared housing with the microphones facing inward towards the ear canal to play back the audio recordings. By recording audio with microphones placed close to the ears, the system provides realistic sounding playback and allows users to more easily differentiate between multiple sources of audio.

Abstract: Provided are an array speaker system and a method of implementing the same. The array speaker system includes a group setting unit setting one or more combinations of a plurality of speakers included in an array speaker system into at least one group according to a predetermined adjustment factor, a signal assignment unit dividing an input signal into at least one sound source signal according to the adjustment factor and selectively assigning the divided sound source signal(s) to the set group(s), a sound adjustment unit adjusting a sound source signal to be output through speakers within the group according to sound source characteristics of the group, and a signal output unit outputting the adjusted sound source signal through the speakers within the group.

Abstract: A method of generating parameters representing Head-Related Transfer Functions, the method comprising the steps of a) sampling with a sample length (n) a first time-domain HRTF impulse response signal using a sampling rate (fs) yielding a first time-discrete signal, b) transforming the first time-discrete signal to the frequency domain yielding a first frequency-domain signal, c) splitting the first frequency-domain signal into sub-bands, and d) generating a first parameter of the sub-bands based on a statistical measure of values of the sub-bands.

Abstract: There is provided headphones for connection to an external active noise compensation device. The headphones have at least one earphone, a microphone near the ear, and a passive circuitry network for increasing the amplification of the external noise compensation device. In that way noise compensation in respect of the external noise compensation can be increased by increasing the overall amplification by the passive network.

Abstract: A speaker diaphragm is configured by a compound mixed with resin and bamboo fiber. The diaphragm satisfying the advantage of the bamboo fiber of high sound quality and a large degree of freedom in the setting of the characteristic value of the diaphragm and the advantage of the diaphragm made of a resin with improved humidity resistance reliability and strength, excellent external appearance, and enhanced productivity and dimension stability is obtained.

Abstract: A source width estimation system may estimate an auditory source width of a sound. The system detects a first frequency modulated noise signal and a second frequency modulated noise signal. The detected noise signals may be processed to obtain an average value of a lateral width of a binaural activity over time and a plurality of sub-bands. The auditory source width of the noise signals may be determined from the average value of the lateral width of the binaural activity.