Disclosed is a receiver unit having a pressure equilibrium structure and a compensation structure for a low frequency, including a receiver including a frame, a magnetic circuit, a voice coil, and a diaphragm, an upper casing covering an upper portion and a side surface of the receiver and having a sound insulation hole, and a lower casing attached to a lower surface of the receiver and coupled to the upper casing, wherein a ventilation recess is provided on an outer surface of the upper casing to allow air to flow between an upper space of the upper casing and a lower space of the lower casing, the receiver includes a back hole, and the lower casing includes a duct connecting the back hole and the lower space of the lower casing.

This application is directed to acoustic chambers that can be incorporated into headsets to improve consistency of sound reproduction between a left and right earcup. Headsets, especially wireless headsets, need to hold many different components within the earcups (e.g., batteries, wireless components, etc.). As earcups are required to hold more components, imbalances between left and right can result. For example, a left earcup might hold a battery, while a right earcup holds wireless charging components. Differences between left and right components can ultimately result in sound reproduction inconsistencies between left and right earcups. Embodiments of the inventive subject matter create consistent acoustic chambers for both left and right earcups so that sound reproduction between the earcups is unaffected by components housed within each earcup.

This application is directed to acoustic chambers that can be incorporated into headsets to improve consistency of sound reproduction between a left and right earcup. Headsets, especially wireless headsets, need to hold many different components within the earcups (e.g., batteries, wireless components, etc.). As earcups are required to hold more components, imbalances between left and right can result. For example, a left earcup might hold a battery, while a right earcup holds wireless charging components. Differences between left and right components can ultimately result in sound reproduction inconsistencies between left and right earcups. Embodiments of the inventive subject matter create consistent acoustic chambers for both left and right earcups so that sound reproduction between the earcups is unaffected by components housed within each earcup.

A novel loudspeaker with a reflex enclosure that has the reflex port terminating to the bottom of the enclosure. The loudspeaker further includes a stand which is removably attached to the bottom of the enclosure so as to create a clearance between the bottom and the surface supporting the loudspeaker.

Acoustic valves include a housing having an acoustic inlet, an acoustic outlet, and an acoustic passage between the inlet and the outlet. An electrical coil is disposed in the housing and configured to generate a magnetic field when energized by an actuation signal. A spring is coupled to an armature movably disposed in the housing between a first surface and a second surface. The valve has a first stable state wherein the armature is positioned against one surface when the electrical coil is not energized, and the valve has a second stable state wherein the armature is positioned against the other surface when the electrical coil is not energized. The armature is movable between the first and second states when the electrical coil is energized, wherein the acoustic passage is more obstructed when the armature is in one state than when the armature is in the other state.

A display apparatus according to an embodiment of the present disclosure includes: a display cell that displays an image and has a thin-plate shape; one or more vibration exciters that are disposed on rear-surface side of the display cell and cause the display cell to vibrate; and an opposing plate opposed to the display cell with an air gap in between. The display apparatus further includes a sound-spreading adjustment member that is disposed between the display cell and the two or more vibration exciters, and controls spreading of a sound generated by vibration caused by the two or more vibration exciters.

Intra-concha earphones are disclosed. In an embodiment, an intra-concha earphone includes a housing having a rear space divided into a back volume, a bass duct, and a vent chamber between a driver and a rear wall. The vent chamber may be acoustically coupled with the back volume through both an acoustic port and the bass duct. Furthermore, the vent chamber may be acoustically coupled with a surrounding environment through a vent port, which may be a sole acoustic opening in the rear wall. Thus, sound emitted by the driver may propagate through the acoustic port and the bass duct to meet in the vent chamber before being discharged through the vent port to the surrounding environment. Other embodiments are also described and claimed.

Intra-concha earphones are disclosed. In an embodiment, an intra-concha earphone includes a housing having a rear space divided into a back volume, a bass duct, and a vent chamber between a driver and a rear wall. The vent chamber may be acoustically coupled with the back volume through both an acoustic port and the bass duct. Furthermore, the vent chamber may be acoustically coupled with a surrounding environment through a vent port, which may be a sole acoustic opening in the rear wall. Thus, sound emitted by the driver may propagate through the acoustic port and the bass duct to meet in the vent chamber before being discharged through the vent port to the surrounding environment. Other embodiments are also described and claimed.

The present disclosure provides a microphone adapted to be installed inside a case of an electronic device, an electronic device and a mobile terminal. The microphone includes a housing; a vibrating membrane set inside the housing, wherein the housing defines a sound collecting hole facing the vibrating membrane; and a connector adapted to connect the housing with the case of the electronic device and defining a first sound guiding tube and a second sound guiding tube; wherein, one end of the first sound guiding tube is communicated with the first sound entering hole while the other end of the first sound guiding tube is communicated with the second sound entering hole, a first end of the second sound guiding tube is communicated with the first sound guiding tube, and a second end of the second sound guiding tube is communicated with the sound collecting hole.

A speaker includes a frame and a partition wall. The frame has ribs to define a central through hole and plural side through holes. The partition wall is coupled with the frame to form a boundary between a high-pitched sound zone and a low-pitched sound zone, wherein a total sum area of the side through holes covered by the partition wall is smaller than a total sum area of the side through holes uncovered by the partition wall.