Various implementations include headphone systems. In one implementation a headband for a headphone system includes: a continuous spring section sized to extend over a head of a user; an earcup mount coupled with an end of the continuous spring section, forming an arcuate joint, where the earcup mount is configured to rotate relative to the continuous spring section at the arcuate joint; and a friction assembly spanning between the continuous spring section and the earcup mount, and configured to provide a substantially constant resistance to the rotation of the earcup mount relative to the continuous spring section, the friction assembly including a coupler having: an upper collar in the continuous spring section, the upper collar comprising a radial protrusion; and a lower collar in the earcup mount, the lower collar comprising a rotation stop for interacting with the radial protrusion in the upper collar.

The speaker box provided by the present disclosure includes a housing with an accommodation space and a speaker in the accommodation space. The speaker includes a diaphragm for radiating sound. The housing includes a ring-shaped step for fixing the speaker. The step further forms a fastening slot for fixing the speaker. The stop further includes a number of recesses extending from a surface toward the fastening slot along a direction away from the fastening slot. BY virtue of the recesses, without changing the vibration space, the acoustic capacitor of the front cavity is increased, and the harmonic peak is lowered. Acoustic performance is accordingly improved.

Various implementations include headphone systems. In one implementation a headband for a headphone system includes: a continuous spring section sized to extend over a head of a user; an earcup mount coupled with an end of the continuous spring section, forming an arcuate joint, where the earcup mount is configured to rotate relative to the continuous spring section at the arcuate joint; and a friction assembly spanning between the continuous spring section and the earcup mount, and configured to provide a substantially constant resistance to the rotation of the earcup mount relative to the continuous spring section, the friction assembly including a coupler having: an upper collar in the continuous spring section, the upper collar comprising a radial protrusion; and a lower collar in the earcup mount, the lower collar comprising a rotation stop for interacting with the radial protrusion in the upper collar.

A loudspeaker arrangement having a first loudspeaker comprising a first sound radiating surface and a first loudspeaker basket, and a second loudspeaker comprising a second sound radiating surface and a second loudspeaker basket. The first loudspeaker and the second loudspeaker are arranged opposite each other in a first direction, a cavity is formed between a front side of the first loudspeaker and a front side of the second loudspeaker, and the first loudspeaker basket is directly coupled to the second loudspeaker basket.

A mouthguard apparatus for providing confidential communications for a user of a headset, comprising: a body of unitary construction, wherein the body includes a) a lumen traversing from a side of the body at least to midway through the body, wherein the lumen extends past midway through the body, and b) a curved indentation disposed on a back of the body, wherein the indentation is concave relative to the body.

Provided is an electronic keyboard instrument and sound releasing method thereof. The electronic keyboard instrument includes: a plurality of keys, a housing that supports the plurality of keys, and one or more speakers arranged in the housing. At least one of the speakers is configured as a flat-plate speaker that includes a vibrating membrane on which a pattern of a conducting wire is formed and a pair of magnet plates disposed facing both surfaces of the vibrating membrane, and the flat-plate speaker vibrates the vibrating membrane with an electromagnetic force accompanying energization of the conducting wire.

An electronic device includes a housing surrounding an exterior of the electronic device and including at least one opening, a sensor module including at least one sensor, a sound output device including sound output circuitry configured to output an acoustic-signal through the at least one opening, a memory, and a processor electrically connected to the sensor module and the sound output device, wherein the processor may be configured to: determine whether the electronic device is in a state where a foreign substance has entered into the electronic device through the at least one opening, determine whether the electronic device is in a first disposition state using the sensor module based at least on determining that the electronic device is in the state where the foreign substance has entered into the electronic device, and control the electronic device to output a specified acoustic-signal having a specified frequency band and a specified waveform through the sound output device based on the electronic device being in the first disposition state.

The application describes a package substrate for a MEMS transducer package having a recessed region formed in an upper surface of the package substrate. The recessed region extends only partially through the package substrate from an opening in the upper surface of the package substrate in a first direction towards the lower surface of the substrate. The recessed region extends only partially though the package substrate from an opening in a side surface of the package substrate in a second direction towards an opposite side surface.

An electronic component module including a fixing part, a function part housed in, or fixed to, the fixing part, at least one connection line, and at least one protrusion on the function part or the fixing part. The fixing part includes an abutting face, an outer face extending from an end of the abutting face in a direction including a component of a first direction, and an edge line along which the abutting and outer faces meet. The connection line is flexible, electrically connected to the function part, positioned on a second direction side relative to the abutting face, and configured to be led out in a third direction from an inside to an outside relative to the edge line. The protrusion extends at least partly in the third direction and is positioned at least partly on the first direction side relative to the connection line in the led-out state.

An ultrasonic sensor is provided with a sensor body, a cushion member, a retainer part and a waterproof seal. The sensor body has an ultrasonic microphone and a microphone support part. The cushion member covers a protrusion part of the ultrasonic microphone. The retainer part sandwiches a sandwiched part on a proximal end side between the retainer part and an outer peripheral surface of the ultrasonic microphone, while exposing an exposed part on a tip end side in the axial direction of the cushion member. The waterproof seal blocks a gap between a vehicle body component and the exposed part of the cushion member in an on-board state.