A sound transducer and a method for operating a sound transducer are disclosed. In an embodiment a sound transducer includes a first piezoelectric element having first external electrodes configured to generate an acoustic signal from an electrical signal or vice versa, and at least one second external electrode, wherein the second external electrode is separately controllable from the first external electrodes in order to set electro-acoustic properties of the sound transducer.

A method, system and devices to selectively control modal vibrations in an elastic panel with a number of force actuators distributed throughout the surface of the elastic panel to excite/depress the response of one or more vibrational resonant modes included in a prescribed subset. The force actuators are disposed such that prescribed modal excitation/depression may be realized when the actuators are driven by a common source signal.

A speaker includes a first flat diaphragm, an actuator that applies vibration corresponding to a sound signal to the first flat diaphragm, and a second flat diaphragm separated from the first flat diaphragm and vibrated by the actuator.

A sound producing device includes at least one air pulse generating element. Each of the at least one air pulse generating element includes a membrane, a first air chamber and at least one opening, wherein a chamber pressure exists in the first air chamber. The membrane is actuated to change the chamber pressure of the first air chamber to generate a plurality of air pulses, the air pulses are propagated through the at least one opening, the air pulses produce a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a pressure value of an ambient pressure outside the sound producing device.

The embodiment of the present disclosure provides an acoustic output device, which includes a first vibration element, a second vibration element, and a piezoelectric element. The first vibration element is physically connected to a first position of the piezoelectric element, and the second vibration element is connected to a second position of the piezoelectric element at least through an elastic element. The piezoelectric element drives the first vibration element and the second vibration element to vibrate in response to an electric signal, and the vibration generates two resonance peaks within the audible range of the human ear.

The embodiment of the present disclosure provides an acoustic output device, which includes a first vibration element, a second vibration element, and a piezoelectric element. The first vibration element is physically connected to a first position of the piezoelectric element, and the second vibration element is connected to a second position of the piezoelectric element at least through an elastic element. The piezoelectric element drives the first vibration element and the second vibration element to vibrate in response to an electric signal, and the vibration generates two resonance peaks within the audible range of the human ear.

One or more embodiments of the present disclosure relates to an acoustic output device, including: a piezoelectric element configured to convert an electrical signal into a mechanical vibration; an elastic element; and a mass element connected to the piezoelectric element through the elastic element. The mass element may be configured to receive the mechanical vibration and generate an acoustic signal, and on a plane perpendicular to a vibration direction of the mass element, the elastic element may provide shear stresses with opposite curls.

One or more embodiments of the present disclosure relates to an acoustic output device, including: a piezoelectric element configured to convert an electrical signal into a mechanical vibration; an elastic element; and a mass element connected to the piezoelectric element through the elastic element. The mass element may be configured to receive the mechanical vibration and generate an acoustic signal, and on a plane perpendicular to a vibration direction of the mass element, the elastic element may provide shear stresses with opposite curls.

One or more embodiments of the present disclosure relate to a vibration device. The vibration device may include a mass component; one or more piezoelectric components configured to produce a vibration based on an electrical signal; one or more elastic components, wherein at least one elastic component of the one or more elastic components are connected to the mass component and the one or more piezoelectric components; wherein the one or more piezoelectric components include a ring structure, and the one or more piezoelectric components are configured to be parallel to an axial direction of the ring structure based on a vibration direction of the electrical signal.

One or more embodiments of the present disclosure relate to a vibration device. The vibration device may include a mass component; one or more piezoelectric components configured to produce a vibration based on an electrical signal; one or more elastic components, wherein at least one elastic component of the one or more elastic components are connected to the mass component and the one or more piezoelectric components; wherein the one or more piezoelectric components include a ring structure, and the one or more piezoelectric components are configured to be parallel to an axial direction of the ring structure based on a vibration direction of the electrical signal.