A Piezoelectric Micromachined Ultrasonic Transducer (PMUT) device includes a substrate, an edge support structure connected to the substrate, and a membrane connected to the edge support structure such that a cavity is defined between the membrane and the substrate, the membrane configured to allow movement at ultrasonic frequencies, the membrane having non-uniform stiffness. The membrane includes a piezoelectric layer, a first electrode and a second electrode coupled to opposing sides of the piezoelectric layer, and a mechanical support layer coupled to one of the first electrode and the second electrode.

A method of forming an ultrasound transducer device includes bonding a membrane to a substrate so as to form a sealed cavity between the membrane and the substrate. An exposed surface located within the sealed cavity includes a getter material that is electrically isolated from a bottom electrode of the cavity.

A method of forming an ultrasound transducer device includes bonding a membrane to a substrate so as to form a sealed cavity between the membrane and the substrate. An exposed surface located within the sealed cavity includes a getter material that is electrically isolated from a bottom electrode of the cavity.

Dual-tone horn assemblies and methods of use are disclosed herein. An example dual scroll assembly includes a nozzle having a first portion of the nozzle has a first diameter and a second portion of the nozzle has a second diameter that has a size that is different from the first diameter, a first spiraled channel that receives air from the first portion of the nozzle. The air traveling through the first spiraled channel produces a first tone at a first frequency. A divider plate is disposed between the first spiraled channel and a second spiraled channel. The second spiraled channel receives the air from the second portion of the nozzle. The air traveling through the second spiraled channel produces a second tone at a second frequency. The first tone and the second tone when produced simultaneously create a dyad.

Dual-tone horn assemblies and methods of use are disclosed herein. An example dual scroll assembly includes a nozzle having a first portion of the nozzle has a first diameter and a second portion of the nozzle has a second diameter that has a size that is different from the first diameter, a first spiraled channel that receives air from the first portion of the nozzle. The air traveling through the first spiraled channel produces a first tone at a first frequency. A divider plate is disposed between the first spiraled channel and a second spiraled channel. The second spiraled channel receives the air from the second portion of the nozzle. The air traveling through the second spiraled channel produces a second tone at a second frequency. The first tone and the second tone when produced simultaneously create a dyad.

Sound diffuser accessory, suitable to be associated to a sound source, such as an electric or electronic or digital musical device or instrument and suitable to diffuse sounds or sound signals deriving from said sound source, wherein such accessory includes at least one sound board, and support structure for the sound board, wherein the sound board includes a board or panel having a flat or slightly curved shape and including a first exposed surface, a second surface, opposite to the first surface and a thickness (S), wherein the sound board includes or is connected with at least one transducer of the electromechanical and/or piezoelectric and/or piezoceramic and/or magnetodynamic and/or magnetostrictive type and wherein the support structure includes at least one element having a substantially strip-like shape and spacer means having a height (H2), suitable to constrain and space the at least one sound board and the support structure.

Sound diffuser accessory, suitable to be associated to a sound source, such as an electric or electronic or digital musical device or instrument and suitable to diffuse sounds or sound signals deriving from said sound source, wherein such accessory includes at least one sound board, and support structure for the sound board, wherein the sound board includes a board or panel having a flat or slightly curved shape and including a first exposed surface, a second surface, opposite to the first surface and a thickness (S), wherein the sound board includes or is connected with at least one transducer of the electromechanical and/or piezoelectric and/or piezoceramic and/or magnetodynamic and/or magnetostrictive type and wherein the support structure includes at least one element having a substantially strip-like shape and spacer means having a height (H2), suitable to constrain and space the at least one sound board and the support structure.

A piezoelectric micro-machined ultrasonic transducer (PMUT) comprising: a semiconductor body having a first cavity and a membrane, which is suspended over the first cavity and faces a front side of the semiconductor body; and a piezoelectric transducer assembly extending at least in part on the membrane, which may be actuated for generating a deflection of the membrane. A second cavity extends buried in a peripheral region of the membrane and delimits a central region of the membrane. Moreover, the peripheral portion has a stiffness lower than the stiffness of the central portion.

The invention relates to a composite for an acoustic component having at least one carrier layer and an electrospun membrane which is arranged on the at least one carrier layer, wherein the electrospun membrane is formed of superimposed fibers while a pore structure is being designed. The pore structure of the composite is designed such that the composite has a water column of at least 1 m and an air permeability of 5 L/m.sup.2*s. Furthermore, the invention relates to a method for producing a composite for an acoustic component, in which a carrier layer is provided and on the carrier layer a membrane is designed according to the electrospinning method, wherein the membrane is produced of superimposed fibers with a defined pore structure.

The invention relates to a composite for an acoustic component having at least one carrier layer and an electrospun membrane which is arranged on the at least one carrier layer, wherein the electrospun membrane is formed of superimposed fibers while a pore structure is being designed. The pore structure of the composite is designed such that the composite has a water column of at least 1 m and an air permeability of 5 L/m.sup.2*s. Furthermore, the invention relates to a method for producing a composite for an acoustic component, in which a carrier layer is provided and on the carrier layer a membrane is designed according to the electrospinning method, wherein the membrane is produced of superimposed fibers with a defined pore structure.