308results about "Room acoustics" patented technology

An apparatus and method for transporting a payload over a surface is provided. A vehicle supports a payload with a support partially enclosed by an enclosure. Two laterally disposed ground-contacting elements are coupled to at least one of the enclosure or support. A motorized drive is coupled to the ground-contacting elements. A controller coupled to the drive governs the operation of the drive at least in response to the position of the center of gravity of the vehicle to dynamically control balancing of the vehicle.

A rigging system includes a lever arm permitting all speakers supported by the speaker whose rigging is adjusted to be angularly reoriented to focus the system, even out the coverage and fine tune the coverage. Multiple pivot attachment points for the moment arm are provided to enable an enhancement of the angular adjustment provided. A dozen or more angular positions can be provided for the lever arm to facilitate the trial-and-error method of optimizing the sound quality within the house.

An acoustic panel for diffusing sound waves, the acoustic panel comprising: a panel front surface and a substantially opposed panel back surface; the panel front surface defining a plurality of front surface regions each delimited by a respective front surface region perimeter, each of the front surface regions being curved. The sound waves incoming at the panel front surface are diffused by the panel front surface.

A radio frequency (“RF”) shielded and acoustically isolated enclosure that efficiently employs multiple layers of sound insulation and absorbs airborne noise and the noise provided by magnetic resonance imaging (“MRI”) equipment through the supports of such equipment. The RF enclosure uses multiple layers and types of insulating materials positioned to maximize the noise absorption of the RF enclosure. This reduces the cost and space required by the enclosure. In one embodiment the enclosure includes a ceiling, a floor and a plurality of walls. The ceiling and walls include one or more multiple layers of different insulating materials that either abut each other or form air gaps. In one embodiment the floor includes a heavy metal plate on which the MRI equipment sits. The plate elastically couples to a conductive shield. The elastic coupling attenuates certain frequencies above the natural frequency of the metal sheet.

A resistive muffler attenuates sound generated by the gas intake and suction valve during compressor operation of a refrigerant compressor. The resistive muffler is assembled inline with the suction gas flow of the compressor and is positioned within the compressor housing. The resistive muffler attenuates the sound generated by the compressor during its operation as refrigerant gas is drawn into the compressor from an evaporator and passes through the resistive muffler in transit to the suction valve and hence to the region of the compressor where the gas is physically compressed. The resistive muffler includes a muffler housing having an intake end and an exhaust end. An acoustic foam assembly is incorporated into the muffler housing. The acoustic foam assembly is selected on the basis of its ability to absorb sound over a broad range of frequencies and is the muffler containing the acoustic foam is assembled within the compressor so that the sound does not bypass the muffler and transmit significant amounts of the sound to the compressor housing. The acoustic foam remains chemically inert when exposed to the compressor fluids at elevated temperatures of operation, and retains its ability to absorb sound over a broad range of frequencies even when saturated with compressor fluids. The foam assembly should also be able to withstand very large pressure fluctuations without experiencing deterioration.

A noise reduction apparatus can include a frame and multiple spaced apart panels positioned adjacent to each other. Each of the panels or only one of the spaced apart panel elements may have holes therein to receive acoustic waves for absorbing the waves between the panels. The panels can be attached to a frame or other connection structure so that the arrangement of panels can be hung over a work space or positioned in a work space (e.g. in a wall, formed as a partition or wall, included as part of shelving, etc.). The panels can also be incorporated into a light fixture that may hang from a ceiling or be attached to some other type of support (e.g. a table, a base, etc.). The panels can be composed of glass, wood, or other type of material.

An acoustical baffle assembly comprising an elongated rigid upper carrier, a rigid panel supported on the carrier and a plurality of clips attaching the panel on the carrier at a plurality of locations along the length of the carrier, the clips each being clinched on an upper edge of the panel and being engaged with the carrier.

A suction muffler for a reciprocating hermetic compressor mounted inside a hermetic shell (1), said suction muffler comprising a hollow body (20) defining at least one acoustic chamber and provided with a gas inlet (22) connected to a suction line (9) by means of a tubular connector, and with a gas outlet (32) connected to a suction valve (8b) of the compressor, said equalizing chamber (60) being provided, on one side, with an opening (60a) to the interior of the hermetic shell (1) and, on the other side, with a fluid communication (61) with the acoustic chamber, said equalizing chamber (60) being dimensioned to minimize, simultaneously, the noises of the gas pulses inside the suction muffler, the mixture of said gas with that contained inside the hermetic shell (1), and the pressure differential between the interior of the latter and the suction line (9), upon operation of the compressor after a stop period.

Discharge device for a reciprocating compressor, wherein the compressor comprises: a casing connected to a gas suction conduit for sucking gas; a cylinder located inside the casing; a compression unit including a piston reciprocating inside the cylinder; a reciprocating A type motor having an inner stator, an outer stator, and an armature reciprocating between them; and a frame unit supporting them by connecting the compression unit and the reciprocating motor, the unit including: a first cover part, in which Forming a valve body and at least one gas passage for controlling the discharge of compressed gas by opening and closing the contained cylinder; and a second cover part arranged continuously with the first cover part and connected to the gas discharge hole, so The gas compressed by the linear reciprocating motion in the cylinder can be discharged smoothly, thereby improving the reliability of the compressor.

The present invention discloses a linear compressor in which a piston is linearly reciprocated inside a cylinder, for sicking a refrigerant into a compression space between the piston and the cylinder, and compressing and discharging the refrigerant, and especially, a structure of discharging the refrigerant for the linear compressor which can reduce a pulsation of a high pressure discharged refrigerant, by making the refrigerant compressed in the compression space flow from a sub-discharge space with a relatively small volume to a sub-discharge space with a relatively large volume in a discharge chamber. As a result, the structure of discharging the refrigerant for the linear compressor can efficiently reduce noise and vibration.