A vibration unit includes a shell with a hollow cavity, a vibration shaft arranged in the hollow cavity and coils, wherein the shell is provided with two elastic support structures located at two ends of the vibration shaft, and at least two permanent magnet rings and at least one magnetic insulator ring are fixed to an outer periphery of the vibration shaft, with each magnetic insulator ring arranged between every two adjacent permanent magnet rings. The coils are fixed on an inner wall of the hollow cavity and located on an outer periphery of each of the permanent magnet rings, wherein a change in a current flowing through each of the coils produces vibration of each of the permanent magnet rings in proportion to the change in the current, which in turn drives the vibration shaft to vibrate in proportion.

A sound diffuser includes a housing and a transducer inside the housing. The transducer includes: a coil including a plurality of turns, each lying on a respective plane (Υ) transverse to a longitudinal axis; a ferromagnetic circuit, including a core provided with a central portion around which the coil is wound and an outer lateral portion located at the side of the coil and at least partly surrounding the coil, the outer lateral portion being separated from the core by an air gap extending longitudinally; and a permanent magnet inside the air gap that is caused to move parallel to the longitudinal axis when the coil is electrically energized. The sound diffuser includes a radiator coupled to the magnet so that longitudinal movement of the magnet parallel to the axis corresponds to longitudinal oscillation of the radiator along the axis.

Various embodiments of balanced armature receivers are disclosed, where the receiver includes a yoke which retains permanent magnets, a coil assembly having a coil tunnel, and an armature coupled to the yoke, with a movable portion extending through the coil tunnel and an end portion that is free to deflect between the magnets when an excitation signal is applied to the coil assembly. There are a stationary protrusion which extends from the stationary portion of the receiver toward the movable portion of the armature, and a movable protrusion which extends from the movable portion of the armature toward the stationary portion of the receiver. The stationary and movable protrusions are offset laterally.

Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS) (such as reluctance assist drivers (RAD) and permanent magnet crown (PMC) drivers). The electroacoustic drivers can be used at all audio frequencies, including subwoofer frequencies. The magnetic negative springs of the electroacoustic drivers can cancel, or partially cancel, the large pressure forces on a sound panel (of an audio speaker) so that substantial subwoofer notes can be efficiently and cost effectively produced in small/portable speakers. The electroacoustic drivers can include a stabilizing/centering mechanism to overcome the destabilizing forces of a MNS that are too large for a voice coil alone to produce.

Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS) (such as reluctance assist drivers (RAD) and permanent magnet crown (PMC) drivers). The electroacoustic drivers can be used at all audio frequencies, including subwoofer frequencies. The magnetic negative springs of the electroacoustic drivers can cancel, or partially cancel, the large pressure forces on a sound panel (of an audio speaker) so that substantial subwoofer notes can be efficiently and cost effectively produced in small/portable speakers. The electroacoustic drivers can include a stabilizing/centering mechanism to overcome the destabilizing forces of a MNS that are too large for a voice coil alone to produce.

A speaker core, speaker, and associated electronic device include at least one bent portion of a diaphragm folded ring suspended over a top of a diaphragm frame enclosing an enlarged vibration space.

A speaker core, speaker, and associated electronic device include at least one bent portion of a diaphragm folded ring suspended over a top of a diaphragm frame enclosing an enlarged vibration space.

A user content audio signal is converted into sound that is delivered into an ear canal of a wearer of an in-ear speaker, while the in-ear speaker is sealing off the ear canal against ambient sound leakage. An acoustic or venting valve in the in-ear speaker is automatically signaled to open, so that sound inside the ear canal is allowed to travel out into an ambient environment through the valve, while activating conversion of an ambient content audio signal into sound for delivery into the ear canal. Both user content and ambient content are heard by the wearer. The ambient content audio signal is digitally processed so that certain frequency components have been gain adjusted, based on an equalization profile, so as to compensate for some of the insertion loss that is due to the in-ear speaker blocking the ear canal. Other embodiments are also described and claimed.

The present disclosure provides an acoustic output device. The acoustic output device may comprise a bone conduction speaker configured to generate bone conduction acoustic waves. The acoustic output device may also comprise an air conduction speaker configured to generate air conduction acoustic waves, the air conduction speaker being independent of the bone conduction speaker. The acoustic output device may further comprise at least one housing configured to accommodate the bone conduction speaker and the air conduction speaker.

The present application discloses a sound-output device, a vibration speaker configured to generate a bone-conducted sound wave; and an air-conducted speaker configured to generate an air-conducted sound wave. The vibration speaker is coupled to the air-conducted speaker through a mechanical structure; and the bone-conducted sound wave is input to the air-conducted speaker at least in part as an input signal.