Abstract: A protective case and mounting system for a handheld electronic device is provided. The protective case can include a removable mounting system comprised of an interlocking member and a plurality of mounting bases. The protective case may further include a non-slip member to prevent the device from slipping on a surface and a magnet for attaching the device to a magnetic surface.

Abstract: A loudspeaker with a mounting assembly is ideally suited for attachment to a wakeboard tower. The mounting assembly includes a clamp assembly for attaching to the tower and a swivel assembly attached to the speaker enclosure. The base of the clamp assembly defines a docking channel that extends generally, and an electrical terminal is positioned at the blind end of the docking channel. The swivel assembly includes a bracket for attaching to the speaker housing and a terminal block that is rotatably mounted on top of the bracket. In this way, once the clamp assembly is attached to the tower bar, the terminal block can be guided into the docking channel by holding the speaker housing. The need to manage wires while mounting the speaker is eliminated by the pin and socket electrical terminals, and the swivel-mounted terminal block aligns itself as it is inserted into the docking channel.

Abstract: A speaker device includes: a speaker unit that includes an acoustic radiation portion; a first box section configured to contain the inserted speaker unit in the box; a support member that pushes the speaker unit against a back wall in the first box section, thereby supporting the speaker unit; a flexible front cushion compressed and contacted between the speaker unit and the support member; and a flexible rear cushion compressed and contacted between the speaker unit and the back wall in the first box section. The speaker unit is pushed and supported by the support member and the back wall of the first box section through the front cushion and the rear cushion.

Abstract: A bottom member includes a light-absorbing element; a top coupling layer disposed on the light-absorbing element; a first buffer element disposed under the light-absorbing element, where a first opening is defined in the first buffer element; a filling layer disposed in the first opening; and a vibrating acoustic element disposed below the first buffer element, where the vibrating acoustic element overlaps with the first opening and the light-absorbing element when viewed from a top, and the vibrating acoustic element is coupled with the first buffer element via the filling layer.

Abstract: This disclosure is directed to audio actuator assemblies that include bridging brackets for mounting audio actuators inside vehicle body components. In some embodiments, the vehicle body component is a door that includes a reinforcement beam. The bridging bracket is mountable to the reinforcement beam in order to secure the audio actuator in place inside the vehicle body component in a manner that allows the audio actuator to vibrate adjacent surfaces of the vehicle body component for radiating sound signals.

Abstract: The present disclosure provides a speaker box. The speaker box includes an upper housing, a lower housing forming an accommodating space together with the upper housing, and a speaker unit accommodated in the accommodating space. The speaker unit includes a diaphragm configured to vibrate and produce sound. The diaphragm is disposed separately from the upper housing to define a front acoustic cavity. The speaker box further includes a sound channel communicating the front acoustic cavity with an external environment. The front acoustic cavity and the sound channel constitute a front cavity of the speaker box together. A baffle fixedly connected to the upper housing is disposed in the sound channel. The baffle and the upper housing define a resonant cavity in communication with the front acoustic cavity, and the resonant cavity has an inlet facing to the front acoustic cavity.

Abstract: The present disclosure provides a speaker box including a shell, a speaker box, a support wall formed by the inner extension of the shell, and a sound guide channel formed in the receiving space. The speaker is fixed to the support wall. The speaker box includes a surrounding wall formed by the inner extension of the shell and a cover plate arranged on the surrounding wall. The shell, surrounding wall, support wall and cover plate are jointly enclosed as auxiliary sound cavity. The support wall is provided with a through-hole, and the auxiliary sound cavity is communicated with the front cavity through the through-hole to form the resonant cavity structure. The speaker box further includes a leakage to achieve the sound pressure balance inside and outside of the shell. Compared with the related art, the high frequency acoustic performance of the speaker box of the present disclosure is excellent.

Abstract: The present disclosure provides a receiver module including a receiver and a microphone. The receiver includes a holder, a vibration unit, a magnetic circuit unit, a front cover, a cover plate, and a mounting block. The vibration unit includes a diaphragm spaced apart from the cover plate to form a front cavity. The front cover includes a front cover body portion, a front cover extension portion, and a first through-hole. The mounting block is fixed on a side of the front cover extension portion facing away from the cover plate and has a second through-hole communicating with the first through-hole. The microphone is fixed on the mounting block, and the front cavity, the first through-hole, the second through-hole and a sound inlet hole of the microphone communicates with each other. The microphone shares the front cavity with the receiver to absorb noise, thereby providing better sound effect.

Abstract: The present disclosure provides a speaker box which comprises a shell, a support wall, a sound guiding channel, a surrounding wall and a cover plate. The speaker is fixed to support the support wall. The diaphragm of the speaker partitions the receiving space into a front sound cavity and a rear cavity, the sound guiding channel communicates the front sound cavity with the outside and forms a front cavity together with the front sound cavity, the shell, the surrounding wall, the support wall and the cover plate are jointly enclosed as an auxiliary acoustic cavity. The support wall is provided with at least two through-holes intervals, and the auxiliary acoustic cavity is communicated with the front cavity through the through-hole to form a resonant cavity structure of the front cavity. Compared with the related art, the high frequency acoustic performance of the speaker box of the present disclosure is excellent.

Abstract: A display apparatus capable of realizing uniform sound wave and improved sound quality is provided. The display apparatus may include a display panel for displaying an image, a supporting member for supporting a rear surface of the display panel, at least one sound generating device disposed between the supporting member and the display panel, at least one partition provided at a predetermined interval from at least one sound generating device, and an adhesion member disposed in the periphery of the display panel.

Abstract: This disclosure is directed to audible vehicle alert systems that include bracket assemblies for detachably mounting components of the audible vehicle alert systems to vehicles. Exemplary audible vehicle alert systems may include a first bracket, a second bracket detachably secured to the first bracket, and a speaker unit mounted to the second bracket. The second bracket may be disconnected from the first bracket during a servicing event for servicing the speaker unit or some other component of the audible vehicle alert system.

Abstract: A passive radiator vibration speaker having a phase reversal structure can include a driving unit configured to generate a driving force, a diaphragm f disposed on an upper side of the driving unit to reproduce a first sound of a sound band of a specific range by being vibrated by the driving unit, a passive radiator disposed above the diaphragm in a state of being spaced apart from the diaphragm by a determined distance to reproduce a second sound of a relatively lower sound band than that of the diaphragm through vibration, and a phase reversal unit having one side being in contact with a lower surface of the diaphragm to reverse a phase of a part of the vibration of the diaphragm so as to transmit a phase-reversed vibration to the passive radiator, where the phase-reversed vibration is in a reversed phase to the vibration of the diaphragm.

Abstract: A sound output device includes: a speaker unit that has a sound emitting portion; an attaching member by which the speaker unit is attached to an object; a separating member that is provided between the speaker unit and the attaching member to separate the speaker unit from the attaching member; and a sealing member that is provided between the speaker unit and the attaching member to reduce a sound that is emitted from a side of the speaker unit opposite to the sound emitting portion and is transmitted to a sound emitting portion side. The attaching member has a first portion on a side of the sound emitting portion of the speaker unit, and the first portion of the attaching member has an opening that corresponds to the sound emitting portion.

Abstract: A speaker mounting system having a driver housing and a plurality of clamping assemblies is disclosed. The driver housing includes a face surrounded by a flange, a driver and a central axis. The clamping assemblies are coupled to the driver housing, each including an enclosure, a dog ear, an actuator, and a biasing element. Each dog ear has a core, a threading, and an arm, is rotatably coupled to the enclosure along a first axis, and slideable along a path. Each actuator has a body and a threading, and is rotatably coupled to the enclosure along a second axis. Each biasing element biases the dog ear towards the face. Each clamping assembly is movable between a hidden configuration, an extended configuration, and a tightened configuration. The speaker mounting system may also include a powered rough-in assembly having a mounting frame and a wiring block with two terminals and two wires.

Abstract: An assembly method of a loudspeaker with closed membrane provides for preassembling a mobile unit having two centering devices fixed to a voice coil; pre-assembling a fixed unit that has a basket fixed to a magnetic unit, assembling the mobile unit in the fixed unit, by a centering device; extracting the centering device and fixing a closed membrane to the voice coil and to the basket.

Abstract: A portable audio input/output device may include an assembly enclosure that contains electrical and mechanical components of the device. A substantially cylindrical frame may encircle the assembly enclosure and may be surrounded by a tube of seamless material. A top end of the tube of seamless material may fold over a top end of the substantially cylindrical frame, and a bottom end of the tube of seamless material may fold over a bottom end of the substantially cylindrical frame. A cover assembly may couple to a top end of the assembly enclosure and secure the top end of the seamless fabric. A charging foot may be coupled to a bottom end of the assembly enclosure and secure the bottom end of the seamless fabric.

Abstract: The invention relates to a new membrane for a loudspeaker. The membrane comprises a central portion having a sound emitting surface and a back surface. The membrane further comprises a first edge directly adjacent to the central portion and surrounding the central portion. The membrane further comprises a second edge surrounding the first edge and an intermediate portion located between the first edge and the second edge, wherein the intermediate portion comprises at least one convex shaped section with regard to the sound emitting surface area of the central portion and at least one concave shaped section with regard to the sound emitting surface area of the central portion.

Abstract: A bracket assembly is used to secure a housing to a support structure such as a post, wall or ceiling. The bracket assembly includes an inner bracket, an outer bracket and a connector. The inner bracket is configured to be mounted on the support structure separately from the outer bracket, and the outer bracket is configured to be quickly mounted on the inner bracket. The outer bracket and connector are joined by a ball and socket joint. Angular adjustment of the ball relative to the socket is made prior to mounting of the outer bracket on the inner bracket, and the desired orientation is maintained using a clamping assembly. The bracket assembly includes sealing features that prevent moisture from entering the assembly.

Abstract: Implementations of a battery pack with reduced magnetic field emission are provided. In some implementations, the battery pack may be configured to reduce and/or eliminate the magnetic field normally generated while electrical current is being drawn from one or more cylindrical-steel electrochemical cells (e.g., AA batteries) by a connected electrical device. In some implementations, each electrochemical cell of a battery pack may include a conductive sleeve comprised of four conductive strips that are separated from the electrochemical cell by a thin insulating layer of material. In this way, the conductive sleeve provides a return path for electrical current that minimizes the loop area between the electrochemical cell and the conductive sleeve thereof. In some implementations, the four conductive strips of a conductive sleeve may be equally spaced 90 degrees apart and/or positioned longitudinally on a cylindrical-steel electrochemical cell, separated therefrom by the insulating layer of material.

Abstract: An electronic device includes a housing. A semi-rigid polymer light pipe ring is positioned along the housing. A portion of the semi-rigid polymer light pipe ring extends outwardly beyond a convex major surface of the housing. A substantially planar housing member is coupled to and seals an interior of the semi-rigid polymer light pipe ring.

Abstract: A speaker device includes: a loudspeaker including a diaphragm and a field portion disposed rearwardly of the diaphragm; and a cabinet accommodating the field portion. The loudspeaker also includes a mounting member with which the loudspeaker is mounted to the cabinet, and a mounting plane of the mounting member includes a center of gravity of the loudspeaker.

Abstract: A combination of a loudspeaker housing and a suspension bracket for hanging the loudspeaker to a fixed suspension point, whereby the suspension bracket and the loudspeaker housing are provided with complementary mechanical coupling devices and whereby the suspension bracket and the loudspeaker are provided with complementary electrical contact points that are arranged to make contact with one another in the situation in which the loudspeaker housing and the suspension bracket are mechanically coupled by means of the mechanical coupling devices, and are further provided with means to fix the loudspeaker in a desired position with respect to the suspension bracket.

Abstract: The present disclosure provides a miniature speaker, including a vibration unit, a magnetic unit and a housing, the vibration unit includes a first diaphragm, a centering support, a second diaphragm and a voice coil; the centering support includes a first centering support and a second centering support having a conductive portion electrically connected with an external circuit; the second diaphragm includes a first half-diaphragm assembled with the first centering support and a second half-diaphragm assembled with the second centering support, the first half-diaphragm and the second half-diaphragm are asymmetrical configured with respect to each other. Under such structure, it is only necessary to adjust the material and shape of the first half-diaphragm and the second half-diaphragm, swing of the miniature speaker at low frequency can be effectively suppressed, a maximum output sound pressure of the miniature speaker can be effectively improved, and low-frequency sound quality can be improved accordingly.

Abstract: Disclosed herein is an electronic device. In an embodiment, the electronic device may include a body, a display combined with the front of the body, and a speaker assembly embedded on at least one side of the body, wherein the speaker assembly may include a casing configured to form an external appearance and a speaker unit combined with the casing and configured to have at least part of an element of the speaker assembly exposed to an outside of the casing.

Abstract: A speaker system includes an enclosure, a speaker unit, and an elastic sheet. The speaker unit is disposed in the enclosure. The elastic sheet includes a first fiber made of a resin and a second fiber made of a resin, and is disposed in the enclosure. The second fiber is thicker than the first fiber and entangled with the first fiber.

Abstract: The invention discloses a sound device. The sound device includes a frame and a lower plate. The frame includes a side wall and a leaking hole penetrating the side wall. The sound device also includes an air-permeable isolator covering the leaking hole, and the air-permeable isolator covers the leaking hole completely. Compared with the related technologies, when the sound device is provided in the box body to form a sound device box, a back cavity circumvented and formed by the sound device and the sound device box can be directly filled with acoustic absorbent to form a virtual acoustic cavity.

Abstract: The present invention discloses a receiver comprising an outer housing that consists of a first housing, a second housing and a third housing fitting to each other from top to bottom. The third housing is an integral structure, and includes a magnetic conductive piece and a plastic piece integrally injection-molded therewith. The magnetic conductive piece is bonded and fixed with a magnet and a washer. The magnetic conductive piece, the magnet and the washer together form a magnetic circuit system of the receiver, and the third housing is fixed with the second housing by ultrasonic welding through the plastic piece. The receiver of the present invention can realize one-step assembly of the rear cavity housing of the product, simplify the production process of the product, save the production time, and further reduce the production cost of the product.

Abstract: A hub comprises a main body with a speaker; a communication module included in the main body; a window formed of a transparent material; a display panel for displaying a screen based on information exchanged via the communication module; and a cover housing coupled to a top of the main body and having a display panel and an opening at an upper surface thereof. The window is provided on an upper surface of the display panel, wherein a normal vector with respect to a predetermined plane in which the opening falls is at an acute angle relative to a horizontal plane, and a vector acquired by orthogonally projecting the normal vector with respect to the horizontal plane faces forward. A portion of the inner surface of the cover housing is parallel with the normal vector, and the window is provided so that an upper surface faces the direction of the normal vector.

Abstract: A method of controlling a speaker grill of a speaker including a play unit separable from the speaker grill in a vehicle includes: collecting at least one of information outputted by a sensor equipped in the vehicle and information indicating an operating state of a device equipped in the vehicle; determining an opening ratio of the speaker grill of the speaker based on the collected information; and controlling a motor device coupled to the speaker grill to achieve the opening ratio.

Abstract: An inflatable speaker includes a collapsible inflatable housing and a loudspeaker, the collapsible housing includes a circumferential side wall, a first end wall, a second end wall, and a valve for inflating the collapsible inflatable housing, wherein the first end wall includes a first inner layer, a first outer layer, and a speaker support plate between them provided with an audio transmission inner sound hole, the first outer layer is provided with an outer sound hole. The loudspeaker is positioned between the first inner layer and speaker support plate, a waterproof ventilated acoustic membrane is placed to cover the loudspeaker frame, a first waterproof adhesive permanently binds the waterproof ventilated acoustic membrane and speaker support plate together, and a second waterproof adhesive permanently binds the edge portion of the outer sound hole and speaker support plate together, thus, giving the inflatable speaker a higher level of protection.

Abstract: A hub includes a main body including a communication circuitry configured to wirelessly communicate with another device and a cover housing coupled to a top portion of the main body, the cover housing including a sidewall that extends in a vertical direction and a partition extending from an inner surface of the sidewall to divide an inside of the sidewall into upper and lower regions. The hub further includes a display panel positioned in the cover housing, the display panel providing a visual output; and a display Printed Circuit Board (PCB) positioned on the partition, the display panel being positioned on an upper surface of the display PCB. The cover housing further includes a rib protruding upward from the partition, the rib extending through a gap between the display PCB and the sidewall to contact with a periphery of the display panel.

Abstract: A hub has a display Printed Circuit Board (PCB) having a contact switch; a display panel positioned above the display PCB and controlled by the display PSB to output content. A window support is positioned over the display panel and has an opening exposing at least a section of display panel. A window formed of a transparent material is positioned over the window support. The window support includes a window support plate defining the opening, the window being positioned on an upper surface of the window support plate; at least one manipulation protrusion extending downward from the window support plate at a position corresponding to the contact switch, the manipulation protrusion operating the contact switch in response to pressure applied to the support plate through the window; and support bosses extending downward from the window support plate and coupled to the partition.

Abstract: A bracket assembly is used to secure a housing to a support structure such as a post, wall or ceiling. The bracket assembly includes an inner bracket, an outer bracket and a connector. The inner bracket is configured to be mounted on the support structure separately from the outer bracket, and the outer bracket is configured to be quickly mounted on the inner bracket. The outer bracket and connector are joined by a ball and socket joint. Angular adjustment of the ball relative to the socket is made prior to mounting of the outer bracket on the inner bracket, and the desired orientation is maintained using a clamping assembly. The bracket assembly includes sealing features that prevent moisture from entering the assembly.

Abstract: A bracket assembly is used to secure a housing to a support structure such as a post, wall or ceiling. The bracket assembly includes an inner bracket, an outer bracket and a connector. The inner bracket is configured to be mounted on the support structure separately from the outer bracket, and the outer bracket is configured to be quickly mounted on the inner bracket. The outer bracket and connector are joined by a ball and socket joint. Angular adjustment of the ball relative to the socket is made prior to mounting of the outer bracket on the inner bracket, and the desired orientation is maintained using a clamping assembly. The bracket assembly includes sealing features that prevent moisture from entering the assembly.

Abstract: A vehicle-mounted speaker system achieves improvement in the weather resistance against a vehicle exterior environment and enables degradation in sound quality to be prevented. In the vehicle-mounted speaker system, a supporting member separating a vehicle interior space from a vehicle exterior space is provided with an opening. The supporting member supports a speaker, and a rear cover covering the back of the speaker closes the opening. The rear cover includes an annular flexible member supported by the supporting member, and a non-flexible vibrating plate supported by an inner portion of the annular flexible member. An enclosed space is defined between the rear cover having such a configuration and a diaphragm of the speaker.

Abstract: A horn for use with a loudspeaker may include an entrance disposed at a first axial end of the horn and configured to receive a driver. A mouth may be disposed at a second axial end of the horn opposite the entrance. A contoured surface may extend between the entrance and the mouth. A cross sectional shape of a coverage pattern of audible sound emitted by the loudspeaker coupled with the horn may be independent of a shape of the entrance and a shape of the mouth.

Abstract: An audio speaker enclosure assembly that includes a first enclosure portion, a second enclosure portion, a speaker magnet, and a cone assembly. The first enclosure portion has a magnet receiving structure with the speaker magnet being fully installed and supported therein. The second enclosure portion has a main wall with an opening. The cone assembly is installed to the main wall with a cone portion of the cone assembly extending through the opening such that a coil portion of the cone assembly extends into a gap of the speaker magnet. The first enclosure portion supports the speaker magnet and the second enclosure portion supports the cone assembly independent of the first enclosure portion with the first and second enclosure portions attached to one another.

Abstract: An electronic device may include a housing, a display carried by the housing, and audio output transducer and passive radiator pairs carried by the housing. The electronic device may also include a controller capable of selectively operating the audio output transducers. In another embodiment, the electronic device may include audio output transducer and serpentine tuning port pairs.

Abstract: A narrow profile speaker unit comprises at least one speaker outputting sound towards an internal surface and through a duct with an output terminus, such as a slot, having a narrow dimension, effectively changing the cross-section of the speaker's audio output wave. A pair of speakers may face one another, outputting sound towards a common output slot. Multiple pairs of speakers may be used to form an inline speaker unit for increased sound output. A slotted speaker unit may include multiple speakers facing the same direction, towards a groundplane or reflecting surface, and having parallel apertures for allowing sound radiation. The speaker units may be integral with or attached to electronic appliances such as desktop computers or flatscreen devices, or may be used in automobiles or other contexts.

Abstract: A loudspeaker damping assembly can mechanically damp or isolate a loudspeaker transducer from a mounting surface. The damping assembly can include a loudspeaker housing or frame that receives a loudspeaker transducer, and a flexible, deformable, or conformable flange damper extending outward from an edge of the loudspeaker housing. The flange damper can be positioned against a loudspeaker wall or ceiling mounting surface. The damping assembly optionally includes a clamp damper opposite the flange damper, or a peripheral edge damper at an outer perimeter edge of the loudspeaker housing. In an example, a loudspeaker system includes a low frequency first transducer and an array of high frequency transducers overlapping a front face of the low frequency transducer. In an example, the transducer array has an arcuate profile, and an axis of the array is non-coaxial with a central axis of the first transducer.

Abstract: A speaker device includes a housing, first speaker unit disposed at a front surface of the housing, a second speaker unit disposed at the front surface, a first passive radiator disposed at the front surface, a second passive radiator disposed at a rear surface of the housing, and at least one structure disposed inside the housing, where the one of the at least one structure is disposed between the first passive radiator and the second passive radiator and disposed to form a gap, through which air flows, between the structure and at least one of the housing, the first speaker unit, the second speaker unit, and another of the at least one structure.

Abstract: A speaker assembly and a display device including the speaker assembly are provided. The speaker assembly may include a first speaker, a first magnet provided on a side of the first speaker, a second speaker, a second magnet provided on a side of the second speaker that faces the side of the first speaker and having a magnetic polarity different from a magnetic polarity of the first magnet, a first bracket provided under the first speaker to support the first speaker, and a second bracket provided under the second speaker to support the second speaker, the second bracket configured to slide out from the first bracket.

Abstract: A loudspeaker includes a light-emitting element, a frame, a magnetic circuit provided with a magnetic gap, a diaphragm, a voice coil bobbin, and a voice coil. The diaphragm has an inner circumferential end including an end face facing the light-emitting element, and a light guide having a reflecting surface formed thereon and provided at a position where light enters from the end face. The first end of the voice coil bobbin is joined to the inner circumferential end of the diaphragm, and the second end is inserted into the magnetic gap. The voice coil is wound around the second end of the voice coil bobbin. Light from the light-emitting element enters the end face of the diaphragm, is diffused by the light guide, and is reflected on the reflecting surface.

Abstract: An audio driver assembly comprises a driver housing and an audio driver secured within the driver housing. The audio driver comprises a magnet assembly, a flexible diaphragm overlying the magnet assembly, and a stabilizer extending through the driver housing and into the magnet assembly. A headphone and a method of forming a headphone are also described.

Abstract: To provide a technology for offering new communication and entertainment options using speakers that are flexible enough to change their shapes. There is provided an electroacoustic transducer including an oscillator formed in a film shape, a detection section adapted to detect the apparent change in shape of the oscillator resulting from a user's act, and an audio output section adapted to output audio based on audio data stored in a given storage area via the oscillator if the change in shape is detected.

Abstract: A panel-form loudspeaker is disclosed. The panel-form loudspeaker includes a lower cover including a recess, and a vibration acoustic unit facing the recess with a periphery thereof fixed on the lower cover for actuating the lower cover to vibrate and generate sound.

Abstract: According to an embodiment, a transducer package includes a circuit board including a port, a lid disposed over the port, an acoustic transducer disposed over the port and including a membrane, and an environmental transducer disposed at the circuit board in the port. The lid encloses a first region, and the membrane separates the port from the first region. Other embodiments include corresponding systems, apparatus, and structures, each configured to perform the actions or steps of corresponding embodiment methods.

Abstract: A loudspeaker device is presented which includes a zeolite material comprising zeolite particles having a silicon to aluminum mass ratio of at least 200. For an increased pore fraction of pores with a diameter in a range between 0.7 micrometer and 30 micrometer shows an increased shift of the resonance frequency down to lower frequencies has been observed.

Abstract: An electronic device may include a housing having an audio output port therein, a display carried by the housing, and an internal partition carried within the housing and defining a baffle space behind at least a portion of the display. The electronic device may also include an audio output transducer carried by the internal partition and acoustically coupled to the audio output port, and a passive radiator within the baffle space, acoustically coupled between the audio output transducer and the display, and acoustically isolated from the audio output port.

Abstract: A computer system having a loudspeaker mounted on a main logic board by a hermetic seal, is disclosed. More particularly, embodiments of the computer system include an acoustic cavity defined between the loudspeaker, the main logic board, and the hermetic seal. Embodiments of the computer system may include a compressible seal separated from the hermetic seal by the loudspeaker and/or the main logic board. The compressible seal may define an acoustic channel and the loudspeaker may emit sound in a high frequency range through the acoustic channel toward a system exit. Other embodiments are also described and claimed.