Microphone systems including a MEMS microphone and an electronic controller. The MEMS microphone includes a movable membrane and a backplate. The movable membrane includes a capacitive electrode and a piezoelectric electrode. The capacitive electrode is configured such that acoustic pressures acting on the movable membrane cause movement of the capacitive electrode. The piezoelectric electrode alters a mechanical property of the MEMS microphone based on a control signal. The backplate is positioned on a first side of the movable membrane. The electronic controller is electrically coupled to the piezoelectric electrode and is configured to generate the control signal.

Microphone systems including a MEMS microphone and an electronic controller. The MEMS microphone includes a movable membrane and a backplate. The movable membrane includes a capacitive electrode and a piezoelectric electrode. The capacitive electrode is configured such that acoustic pressures acting on the movable membrane cause movement of the capacitive electrode. The piezoelectric electrode alters a mechanical property of the MEMS microphone based on a control signal. The backplate is positioned on a first side of the movable membrane. The electronic controller is electrically coupled to the piezoelectric electrode and is configured to generate the control signal.

In a method for producing an acoustical damping unit, a plurality of bodies, e.g. plastic balls, of predefined sizes are produced and brought together in a desired shape by a 3D printing process. The bodies are arranged such that air can flow through gaps between them, wherein the air can flow through the complete acoustical damping unit. The gaps are interconnected so that the acoustical damping unit is open-pored. An acoustical damping unit in the form of a 3-dimensional body with a desired acoustical damping can be produced by adjusting the size of the bodies, the temperature of the plastic and the speed of application of the plastic bodies.

A combined MicroElectroMechanical structure (MEMS) includes a first piezoelectric membrane having one or more first electrodes, the first piezoelectric membrane being affixed between a first holder and a second holder; and a second piezoelectric membrane having an inertial mass and one or more second electrodes, the second piezoelectric membrane being affixed between the second holder and a third holder.

A speaker device (1) having a frame (2), two opposite directed diaphragms (3, 3′), and two speaker drivers, each having at least one magnetic driver (10, 10′) for driving the two opposite directed diaphragms (3, 3′) in operation. A speaker damper (5, 5′) is associated with each of the two opposite directed diaphragms (3, 3′), and has a coil bracket (4, 4′) arranged to be driven by the associated at least one magnetic driver (10, 10′), a diaphragm connection member (6, 6′) arranged to fixedly attach the diaphragm (3, 3′) to the speaker damper (5, 5′), and a damper frame connection member (8, 8′) arranged to fixate the speaker damper (5, 5′) to the frame (2). The speaker damper (5, 5′) further comprises a damper leg member (7, 7′) arranged between the diaphragm connection member (6, 6′) and the damper frame connection member (8, 8′).

A speaker device (1) having a frame (2), two opposite directed diaphragms (3, 3′), and two speaker drivers, each having at least one magnetic driver (10, 10′) for driving the two opposite directed diaphragms (3, 3′) in operation. A speaker damper (5, 5′) is associated with each of the two opposite directed diaphragms (3, 3′), and has a coil bracket (4, 4′) arranged to be driven by the associated at least one magnetic driver (10, 10′), a diaphragm connection member (6, 6′) arranged to fixedly attach the diaphragm (3, 3′) to the speaker damper (5, 5′), and a damper frame connection member (8, 8′) arranged to fixate the speaker damper (5, 5′) to the frame (2). The speaker damper (5, 5′) further comprises a damper leg member (7, 7′) arranged between the diaphragm connection member (6, 6′) and the damper frame connection member (8, 8′).

Planar loudspeaker comprising a planar sound panel (10), a mounting (12), at least one drive unit (14) for driving the sound panel (10), said drive unit preferably being attached to the mounting (12), and at least one stabilizing device (22) for stabilizing a movement of the sound panel (10), wherein the stabilizing device (22) is arranged between the sound panel (10) and the mounting (12) and comprises at least a stroke section (28), which is configured so as to be movable, flexible and/or elastic, and at least one centering device (36) for centering the sound panel (10) and/or at least a part of the drive unit (14), wherein the centering device (36) is arranged in a different plane than the stabilizing device (22) and comprises at least a stroke section (28), which is configured so as to be movable, flexible and/or elastic.

A combined MicroElectroMechanical structure (MEMS) includes a first piezoelectric membrane having one or more first electrodes, the first piezoelectric membrane being affixed between a first holder and a second holder; and a second piezoelectric membrane having an inertial mass and one or more second electrodes, the second piezoelectric membrane being affixed between the second holder and a third holder.

A sound control system comprises a sound generating device disposed at a vehicle ceiling corresponding to a seat region of the vehicle and disposed at a sound space formed within the vehicle to correspond to the seat region, and a sound processing circuit for providing a vibration driving signal to the sound generating device, the sound generating device vibrates based on the vibration driving signal to vibrate a vibration region of the vehicle ceiling corresponding to the sound space to provide a sound to the sound space.

A sound generating device includes a magnet and a center pole on a yoke, a bobbin around the center pole, a coil wound around the bobbin, a frame outside the yoke, a damper between the frame and the bobbin, and a spacer in the bobbin.