Disclosed is a piezoelectric oscillating device, which comprises a multi-section guiding component and an oscillation generating component, the multi-section guiding component including a plurality of guiding units, each guiding unit having a hollow space, the plurality of guiding units being connected together along a longitudinal direction in such a manner that the hollow spaces are connected in series to form the multi-section guiding component, and a guiding channel is formed inside the multi-section guiding component by connecting the plurality of hollow spaces in series, the oscillation generating component including a housing unit and a piezoelectric component, the housing unit being connected to an end of the multi-section guiding component in the longitudinal direction, the piezoelectric component being disposed in a disposing space in the housing unit and oscillating via a control of a piezoelectric signal.

Embodiments may be directed to a codesigned shroud for a chassis comprising a plurality of components and a plurality of fans generating a plurality of airflows to cool the plurality of components. The codesigned shroud may have a plurality of walls defining a plurality of channels, wherein at least two walls of the plurality of walls define each channel of the plurality of channels. Each channel may be aligned with a direction of an airflow of the plurality of airflows. At least one channel includes a set of baffles oriented substantially perpendicular to the direction of an airflow in the channel. Each baffle may be formed with acoustically absorbent material to absorb acoustic energy that could affect performance of a component, wherein a first baffle of the set of baffles is offset from a second baffle of the set of baffles.

A resonance tube of a horn according to one aspect of the present invention includes a first resonance tube and a second resonance tube branching from the first resonance tube at a branching portion. The first resonance tube is a resonance tube that resonates with a first sound contained in a chord generated by a diaphragm. The first resonance tube includes: an input opening surface to which the chord is input; and a first opening surface from which the first sound is output. The second resonance tube is a resonance tube that resonates with a second sound contained in the chord. The second resonance tube includes a second opening surface from which the second sound is output. The second opening surface is displaced from the first opening surface in a normal direction K1.

A resonance tube of a horn according to one aspect of the present invention includes a first resonance tube and a second resonance tube branching from the first resonance tube at a branching portion. The first resonance tube is a resonance tube that resonates with a first sound contained in a chord generated by a diaphragm. The first resonance tube includes: an input opening surface to which the chord is input; and a first opening surface from which the first sound is output. The second resonance tube is a resonance tube that resonates with a second sound contained in the chord. The second resonance tube includes a second opening surface from which the second sound is output. The second opening surface is displaced from the first opening surface in a normal direction K1.

A sound output apparatus, a display apparatus and a method for controlling the same are provided. The sound output apparatus includes a housing; and at least one speaker provided on a side of the housing, wherein the housing includes an accommodation portion provided with an insertion groove to which the at least one speaker is inserted and mounted, wherein the at least one speaker includes a sound generator configured to generate a sound; and a guide tube that has a cross sectional area that changes from a first end of the guide tube to a second end of the guide tube, and wherein the guide tube receives the generated sound via the first end, and the guide tube includes an outer surface having a plurality of radiation apertures arranged in at least one row.

The present technique relates to an acoustic tube and an acoustic reproduction apparatus that can generate an evanescent wave at a lower cost. An acoustic tube includes an acoustic path longer than an external dimension of the acoustic tube and includes a plurality of opening portions or a slit-like opening portion. When a sound wave advances in the acoustic tube, sound waves are output from the plurality of opening portions or from a plurality of positions of the slit-like opening portion, and the sound waves are combined to form an evanescent wave. The present technique can be applied to an acoustic tube, an acoustic reproduction apparatus including the acoustic tube, and the like.

The present technique relates to an acoustic tube and an acoustic reproduction apparatus that can generate an evanescent wave at a lower cost. An acoustic tube includes an acoustic path longer than an external dimension of the acoustic tube and includes a plurality of opening portions or a slit-like opening portion. When a sound wave advances in the acoustic tube, sound waves are output from the plurality of opening portions or from a plurality of positions of the slit-like opening portion, and the sound waves are combined to form an evanescent wave. The present technique can be applied to an acoustic tube, an acoustic reproduction apparatus including the acoustic tube, and the like.

A vehicle and an adjustable sound distribution system that includes an engine operable to produce a pulsation and a sound assembly coupled to the engine. The sound assembly is disposed upstream from the engine. The sound assembly is configured to generate sound from the pulsation. The sound assembly includes a housing defining a cavity configured to resonate the sound that exits the sound assembly. The sound assembly also includes a first member movable to change a frequency of the sound that exits the sound assembly.

A vehicle and an adjustable sound distribution system that includes an engine operable to produce a pulsation and a sound assembly coupled to the engine. The sound assembly is disposed upstream from the engine. The sound assembly is configured to generate sound from the pulsation. The sound assembly includes a housing defining a cavity configured to resonate the sound that exits the sound assembly. The sound assembly also includes a first member movable to change a frequency of the sound that exits the sound assembly.

An internal combustion engine comprising: a plurality of cylinders; at least one intake manifold, which receives fresh air from the outside; a plurality of intake channels, each connecting a cylinder to the intake manifold; and an intake sound amplification device, which is provided with an amplification pipe, an insulating element sealing the amplification pipe in a tight manner, a plurality of amplification channels, each originating from a corresponding intake channel, and an amplification manifold, which, on one side, is connected to all amplification channels and, on the other side, is connected to the amplification pipe.