92results about How to "Improve acoustics" patented technology

The invention discloses a sound absorbing material preparation method, a sound absorbing material and a loudspeaker. The method comprises the following steps of preparing non-foamed material slurry, and mixing uniformly; performing reaction on the non-foamed material to form non-foamed sound absorbing material powder with the FER or MFI structure; performing heteroatom replacement on the non-foamed sound absorbing material powder; adding binder into the modified non-foamed sound absorbing material powder; shaping, drying and calcining the non-foamed sound absorbing material, and thereby obtaining the non-foamed sound absorbing material with a set grain size, wherein the mass ratio of silicon and aluminum in the non-foamed sound absorbing material is less than 200. The sound absorbing material is prepared by the non-foamed material, and the mass ratio of silicon and aluminum in the prepared non-foamed sound absorbing material powder is less than 200. The rear vocal cavity of the loudspeaker is filled with the sound absorbing material provided by the invention. The method is low in requirements on material category and grade and simple in technology; and the material prepared by the method is good in absorbing ability and slow in aging. The loudspeaker has good acoustic effect.

Systems and methods for applying vibration to and tracking the position and motion of the human body. A vibration system includes a vibrator capable of converting an electrical signal into vibration, and a motion tracking device capable of tracking the motion and position of a user. In one aspect, the vibrator is arranged on or about the human body on a pectoralis major muscle and spaced away from a sternum. In another aspect, the vibrator is arranged on or about the human body such that a first pattern of vibrations are generated on the body's surface. The first pattern of vibrations matches in relative amplitude a second pattern of vibrations generated on the body's surface when the body generates sound.

An audible alarm has first and second acoustic chambers that deliver sound to respective first and second horns. A phase adjustment circuit for delays the phase of sound generated in one of the two chambers so that sound emerging from the two horns is delivered with the same phase and same frequency, and emerging sound from the two horns is additive.

Composite roofing structures can include mineral fiber roof cover boards with high concentration of mineral wool or mineral wool and perlite. The roofing structure may include: a roof cover board including a dried base mat including: 8-25% mineral wool, 40-65% perlite, 9-15% binder, 9-15% cellulosic fiber, and 0.25-2% sizing agent, all % by weight; an insulation layer; and a roofing membrane. The roof cover board is over the insulation layer, the roofing membrane is over the roof cover board. The roof cover board is attached to the insulation layer. The roofing membrane is attached to the roof cover board. Alternatively dried base mat may include: 30-70% mineral wool, 10-50% perlite, 5-15% binder, 2-20% cellulosic fiber, and 0.25-2% sizing agent. Alternatively the dried base mat may include: 60-90% mineral wool, 0-10% fiber, 0-10% perlite, 4-10% binder, 0-5% gypsum, and 0.25-2% sizing agent.

A tubular handlebar includes an internal peripheral surface and a stem head with a mounting system for a mobile device. The tubular handlebar includes a open end, a closed end, at least one speaker unit embedded into at least one through hole of the internal peripheral surface, and a bass reflex system to enhance the acoustic characteristics of the sound generated by the at least one speaker unit. The tubular handlebar has a sound box affixed to the internal peripheral surface of the tubular handlebar and housing a rear part of the at least one speaker unit. The bass reflex system includes a bass reflex duct connecting the sound box with the first end. The mounting system further includes a first connector to electrically connect the mobile device to a second connector. The second connector can be detached or reattached to the at least one speaker unit.

A panel includes about 0.1% to about 95% by weight of a ground renewable component. In an embodiment, the panel has at least one core comprising: from about 0.1% to about 95% by weight of the ground renewable component; from about 0.1% to about 95% by weight of one or more fibers; and from about 1% to about 30% by weight of one or more binders, all based on dry panel weight. In an embodiment, the ground renewable component has a particle size distribution whereby less than 5% of the particles are retained by a mesh screen with openings of about 0.312 inches and less than 5% of the particles pass through a mesh screen with openings of about 0.059 inches. A method for manufacturing such panels is also provided.

An acoustic sensor used in underwater applications. The sensor includes a reflective material adhered to a structure, such as an outer submarine hull or any marine vessel hull. A laser interferometer is placed on the side of the structure with the reflective material. The laser interferometer sends a plurality of laser beams, in sequence or all at one time, to a plurality of points across the retro-reflective material. The laser beams reflect back to the interferometer, which captures the reflected beams using receiving optics. The phase modulation of the reflected laser beams is compared to a reference laser beam within the interferometer to obtain the vibration velocity characteristics of the hull surface structure. Since the reflective material is adhered to the structure, the structure vibration is the same as the vibration of the reflective material. From this vibration, the acoustic pressure associated with the structure may be calculated.

A chain including identically-configured plate elements having at least one through opening that overlaps with through openings of preceding and following plate elements. The plate elements are interconnected with identically-configured rocker members that extend into the plate openings. The rocker members are in the form of pins having an asymmetric cross-sectional shape that includes rolling surfaces and contact point surfaces that engage with the plate opening surfaces. Outer end faces of the rocker members are crowned to provide contact points that are asymmetrically positioned relative to a pin longitudinal central axis. By reversing the rocker member orientation within the plate element through openings, randomization of chain contacts with chain-driven components is achieved, with improved acoustics. And by utilizing identical plate elements and identical rocker members parts manufacture is simplified, as are part inventory requirements.

A drone-based audio system comprising a microphone mounted to a drone body for receiving environmental sound information. The drone-based audio system additionally comprising a processing unit configured to analyze the environmental sound information and calculate active noise cancellation information. The drone-based audio system further comprising a speaker mounted to the drone body for emitting the active noise cancellation information.

A displacement ventilation system includes a vertical duct located inside an enclosed space and extending between a floor and a ceiling of the enclosed space, an air inlet coupled with the vertical duct for drawing air into the displacement ventilation system, and an elongated diffuser extending adjacent the floor for diffusing at least some of the outside air over the floor of the enclosed spaced. The displacement ventilation system desirably includes a return air duct extending adjacent the ceiling and being coupled with the vertical duct for removing return air from the enclosed space and advancing the return air toward the vertical duct, a heat exchanger for transferring thermal energy between the return air and the outside air, and a heat pump for changing a temperature level of the outside air or the return air passing through the heat pump.

The invention relates to a voice coil, a loudspeaker and a manufacturing method of the voice coil. The voice coil comprises a voice coil body formed by winding an enameled wire, a starting wire end and a tail wire end,wherein the voice coil body is provided with a starting wireoutgoing position and a tail wireoutgoing position, the starting wireend is led out from the starting wireoutgoing position, the tail wireend is led out from the tail wireoutgoing position, the starting wireoutgoing position and the tail wireoutgoing position are located at any position in the middle of the voice coil body, and the height of the voice coil body is formed to be the height of the voice coil. The problem that in an existing winding mode, the height of one more layer of wire diameter of the voice coil isincreased due to the fact that wires are led out from two ends of the starting wire is effectively solved, the occupied vibration space of winding is reduced, collision between the voice coil and parts such as a basin stand is prevented, the stability and durability of the voice coil are improved, and the acoustic effect is more excellent.

A mechanical tapper clips onto the end of a stethoscope. The device is operated by pressing a small plunger with the index finger of the hand holding the end of the stethoscope onto the patient's body to aid the percussion portion of a physical exam.

Certain example embodiments relate to an acoustic wall assembly that uses active and/or passive sound reverberation to achieve noise-disruptive functionality, and/or a method of making and/or using the same. With the active approach, sound waves in a given frequency range are detected by a sound masking circuit. Responsive to detection of such sound waves, an air pump (e.g., speaker) is used to pump air in the wall assembly to actively mask the detected sound waves via reverberation and/or the like. The wall assembly may include one, two, or more walls, and the walls may be partial or full walls. With the passive approach, sound waves in a given frequency range are disrupted via features (e.g., holes, slits, etc.) formed in and/or on a wall itself. These techniques may be used together or separately, in different example embodiments.

The disclosure provides a well system component configured to reduce excessive acoustic noise that would otherwise interfere with acoustic telemetry systems. Specifically, the well system component includes a body configured to be coupled to a pipe string, at least one lobe extending radially from the body, and a pad disposed on the at least one lobe and extending radially from an outer radial extent of the at least one lobe. The well system component can be installed at critical acoustic transmission locations, such as at the location of a hanger, at or near a flex joint in a wellhead installation, and/or at or near a rig floor or deck of an offshore rig.

A displacement ventilation system for a room includes a first duct located inside the room and extending between a floor and a ceiling of the room, an air inlet coupled with the first duct for drawing air into the system, and an elongated diffuser extending adjacent the floor for diffusing at least some of the outside air over the floor of the enclosed spaced. The system includes a return air duct extending adjacent the ceiling and being coupled with the first duct for removing return air from the room and advancing the return air toward the first duct, a heat exchanger for transferring thermal energy between the return air and the outside air, and a heat pump for changing a temperature level of the outside air or the return air passing through the heat pump. The system includes sensors located inside the room, and a controller for controlling operation of the system. The controller is in communication with the sensors.

A composite material for a folding vehicle roof of a convertible vehicle is provided in which a lower layer that faces the interior of a vehicle when the vehicle roof is closed is constructed at least in part as a woven textile layer, which is bonded on its side that faces away from the interior of the vehicle when the vehicle roof is closed to a leather layer via an intermediate layer and characterized in that on the side of the leather layer that faces an intermediate layer, which serves to improve the water impermeability of the composite material, an intermediate layer that impregnates the leather layer and also serves to improve the water impermeability of the composite material, along with strengthening a bond between the leather layer and the intermediate layer, is applied.