1649results about "Electrical transducers" patented technology

The technology described herein is directed towards a metasurface arranged with unit cells for narrowband sound absorption, in which the unit cells are based on Helmholtz resonators that can have their resonant frequencies adjusted via MEMS actuators. A sound absorbing unit-cell is designed and constructed based on a general resonance frequency, and includes a neck portion and air chamber dimensioned to resonate close to the desired resonance frequency and thereby inverse phase cancel corresponding narrowband frequencies of incoming sound waves. A bimorph MEMS actuator and / or moveable part in the resonators, controlled by a controller, facilitates changing of the airflow the unit cells to adjust the resonant frequencies thereof, to cancel acoustic waves of different frequencies corresponding to noise, which can change over time. The unit cells can be distributed as part of a metasurface, which can be positioned proximate to a noise source to phase cancel the noise.

The present invention relates to the technical field of sound energy conversion, and disclosed are a sound production apparatus and an electronic device. The sound production apparatus comprises a magnetic circuit system, a first vibration system, a second vibration system, and a housing; the magnetic circuit system is used for forming a first magnetic gap and a second magnetic gap; the first vibration system comprises a first annular diaphragm and a first voice coil, wherein the first voice coil is arranged corresponding to the first magnetic gap; the second vibration system comprises a second diaphragm and a second voice coil; the housing and the first vibration system define a first sound cavity; a side sound outlet hole communicated with the first sound cavity is formed in a side wall of the housing; the housing and the second vibration system define a second sound cavity; and a front sound outlet hole communicated with the second sound cavity is formed in the housing, such that the sound production apparatus can be adapted to a use scenario in which a front sound outlet tube and a side sound outlet tube are provided. Because both the first vibration system and the second vibration system can produce sound, the total radiation area of the sound production apparatus is increased, and the performance of the sound production apparatus is improved.

A hearing aid system comprises a hearing aid, and a portable auxiliary device’ adapted to establish a communication link between them. The hearing aid comprises a microphone providing an electric input signal, a signal processor, and an output unit. The auxiliary device comprises a microphone providing an auxiliary electric input signal, and a user control interface allowing a user to initiate a specific calibration mode of operation of the hearing aid system. The signal processor of the hearing aid is configured to receive corresponding time segments of said electric input signal and said auxiliary electric input signal to provide an estimate of an acoustic transfer function from said microphone of said auxiliary device to said microphone of said hearing aid. A method of operating a hearing aid system is further disclosed. The invention may e.g. be used in various applications related to own voice detection and estimation.

The utility model discloses a sounding device, a sounding module and an electronic device, and relates to the technical field of electroacoustic transduction, a central magnetic part of a magnetic circuit system of the sounding device comprises a first central magnet, a central magnetic conductive plate and a second central magnet which are stacked, and the inner side of an inner folding ring of a first diaphragm assembly of a vibration system is connected with the central magnetic part. The outer periphery of the outer folding ring is connected with the shell, the diaphragm and the second diaphragm assembly are sequentially arranged on the side, facing the magnetic conductive yoke, of the first diaphragm assembly, the outer edges of the diaphragm and the second diaphragm assembly are both connected with the shell, and the inner edge of the diaphragm is connected with the inner edge of the second diaphragm assembly. And the rigid connecting piece is connected with the second vibrating diaphragm assembly, and the other end of the rigid connecting piece is connected with the voice coil, so that the voice coil drives the second vibrating diaphragm assembly to vibrate through the rigid connecting piece. According to the sounding device, the effective vibration area of a vibration system is increased, and the acoustic performance is improved.

The utility model discloses a double-sided sound production loudspeaker, which comprises a shell, a magnetic circuit system and a vibration unit, the magnetic circuit system comprises a magnetic conductive seat connected with the shell, the magnetic conductive seat comprises a main magnetic plate and side magnetic plates, the side magnetic plates are respectively arranged on two sides of the main magnetic plate along a first direction at intervals, the main magnetic plate is provided with a main magnetic unit, and the main magnetic unit is provided with a plurality of vibration units. An edge magnetic unit is arranged on the edge magnetic plate; the vibrating unit comprises vibrating diaphragms and voice coils, the two vibrating diaphragms are arranged on the shell in a spaced mode in the second direction, the voice coils are arranged on the two vibrating diaphragms, and the voice coils are located between the main magnetic unit and the side magnetic units. According to the double-sided sounding loudspeaker, the two sides of the magnetic circuit system are respectively provided with one vibration unit, so that the two voice coils can form two independent magnetic fields through the main magnetic unit and the side magnetic units respectively, double-sided sounding is realized, the two magnetic fields share one magnetic conductive seat, the space occupied by the magnetic circuit system along the first direction is reduced, and the space occupied by the magnetic circuit system along the second direction is reduced. And the miniaturization and thinning development of the double-sided sounding loudspeaker is facilitated.

The present application provides a sound production apparatus and an electronic device. The sound production apparatus comprises a housing, a magnetic circuit assembly, a vibration assembly, and a spider. The magnetic circuit assembly has a first magnetic gap and a second magnetic gap. The vibration assembly comprises a diaphragm component and a voice coil component. The voice coil component comprises a first voice coil disposed corresponding to the first magnetic gap and a second voice coil disposed corresponding to the second magnetic gap. The spider is electrically connected to the voice coil component and an external circuit. The spider comprises a connection arm, a bent arm, and a vibration arm connected in sequence. The connection arm is disposed on the diaphragm component and is electrically connected to the first voice coil and the second voice coil. The vibration arm extends in a bent shape. The bent arm is connected between the connection arm and the vibration arm, and the bent arm extends from an inner end of the vibration arm along a vibration direction of the vibration assembly and is connected to the connection arm. This configuration improves the magnetic field strength of the magnetic circuit assembly, thereby increasing the BL value of the sound production apparatus and ensuring the acoustic performance of the sound production apparatus.

The invention discloses a loudspeaker power adjustment method and device, equipment and a storage medium, and relates to the technical field of electro-acoustic conversion, and the method comprises the steps: determining the impedance of a loudspeaker, and determining the target diaphragm displacement of the loudspeaker based on the impedance; determining the direct current resistance of a voice coil of the loudspeaker, and determining the target voice coil temperature of the loudspeaker based on the direct current resistance; and when the driving power of the loudspeaker is adjusted, keeping the target diaphragm displacement and the target voice coil temperature within respective preset thresholds. According to the invention, the loudspeaker is protected, and the performance of the loudspeaker is remarkably improved.

A system is provided to activate on-board special effects of a handheld or other interactive object that carries no, or relatively low-power, internal power supplies and that is directly enabled or passively powered by acoustic energy of acoustic waves from an external source. The interactive object may include a resonate chamber to receive the acoustic waves and convert the acoustic energy therein to mechanical and / or electrical energy. The interactive object may additionally include a power harvesting system configured to store and / or supply the electrical energy to an on-board special effect system. As such, the interactive object may be configured to create a variety of special effects with no, or relatively low-power, internal power supplies.

The invention provides a loudspeaker assembly, a vehicle-mounted loudspeaker system and a vehicle, and relates to the technical field of vehicle-mounted sound equipment, the loudspeaker assembly comprises a shell, a base, a rotation driving ring, a lifting driving ring and a mesh enclosure part, the base is detachably installed in the shell, and a placement cavity is reserved in the base; the lifting driving ring is vertically and slidably connected with the base, a first directional groove and a second directional groove which are communicated are formed in the outer ring surface of the lifting driving ring, the first directional groove obliquely extends in the vertical direction, and the second directional groove vertically extends and penetrates through one end of the lifting driving ring; the rotary driving ring is rotationally connected to the base, a protrusion and a gear ring are arranged on the rotary driving ring, and the protrusion is slidably connected into the first directional groove or the second directional groove; the mesh enclosure part is vertically connected with the rotary driving ring in a sliding mode, and the mesh enclosure part further vertically abuts against the lifting driving ring and is rotationally connected with the lifting driving ring. The problems that an existing lifting horn device is still large in occupied vertical space, complex in structure and not easy to install are solved.

An audio system is provided. The audio system includes a plurality of loudspeakers and a mobile device. The plurality of loudspeakers is capable of being positioned in a listening environment and being arranged to transmit an audio signal in the listening environment. Each loudspeaker is programmed to determine angle information of the audio signal as received at the loudspeaker relative to other loudspeakers of the plurality of loudspeakers and to transmit a first signal indicative of the angle information. The mobile device is programmed to receive the first signal from each of the loudspeakers and to determine a location for each loudspeaker in the listening environment based at least on the angle information.

The utility model discloses a sounding device and a sounding module, and relates to the technical field of electroacoustic transduction, the inner side of an inner folding ring of a first vibrating diaphragm assembly of the sounding device is connected with a central magnetic part, and a diaphragm and a second vibrating diaphragm assembly are sequentially arranged on one side, facing a magnetic conductive yoke, of the first vibrating diaphragm assembly; the diaphragm is arranged in the shell, a sound production cavity communicated with a sound production hole of the shell is formed between the diaphragm and the second diaphragm assembly, the diaphragm is a flexible piece, and the two ends of the rigid connecting piece are connected with the second diaphragm assembly and the voice coil respectively, so that the voice coil drives the second diaphragm assembly to vibrate through the rigid connecting piece; the outer periphery of the outer folding ring and the outer periphery of the diaphragm are both connected with the first shell, the magnetic conductive yoke is connected with the second shell, and the outer periphery of the second diaphragm assembly is clamped between the first shell and the second shell. According to the sounding device, the effective vibration area of a vibration system is increased, and the acoustic performance is improved.

The utility model discloses a sound production device and electronic equipment. The sound production device comprises a shell, a magnetic circuit system, a vibration system and a conductive piece, the magnetic circuit system is connected to the inner side of the shell; the vibration system comprises a first vibrating diaphragm and a second vibrating diaphragm which are respectively positioned on two opposite sides of the magnetic circuit system, and a first voice coil and a second voice coil which are respectively connected with the first vibrating diaphragm and the second vibrating diaphragm; the conductive part is arranged on the shell and provided with a first bonding pad, a second bonding pad and an outer conductive part, the first bonding pad and the second bonding pad are arranged in the first direction and are close to the first vibrating diaphragm and the second vibrating diaphragm respectively, the first direction is the vibration direction of the vibration system, and the second direction is the vibration direction of the vibration system; the first voice coil and the second voice coil are electrically connected with the first bonding pad and the second bonding pad respectively, and the outer conductive part is exposed out of the side surface of the shell and electrically connected with an external circuit. According to the sound production device provided by the invention, the number of the outer conductive parts outside the shell is reduced, the assembly space of the whole machine is saved, and the miniaturization design of a product is facilitated.

The utility model discloses a loudspeaker and an electronic device, relates to loudspeaker structure technical field, the loudspeaker comprises a housing, and a magnetic circuit system and a vibration system connected with the housing, the magnetic circuit system has a magnetic gap, the vibration system comprises a first diaphragm, a voice coil, a middle diaphragm, a second diaphragm and a rigid connecting piece, the voice coil is connected with the first vibrating diaphragm, and at least part of the voice coil is arranged in the magnetic gap; the middle diaphragm is positioned on the second side of the first vibrating diaphragm; the inner peripheral side of the second vibrating diaphragm is connected with the voice coil; the rigid connecting piece is connected between the second vibrating diaphragm and the voice coil; wherein the shell comprises a first shell and a second shell; the first vibrating diaphragm and the middle diaphragm are fixed to the first shell, the magnetic circuit system is fixed to the second shell, the second vibrating diaphragm is clamped between the first shell and the second shell, and the second sound outlet hole is formed in the first shell. The utility model aims to provide the loudspeaker shell structure with small size and high performance.

A discharge device for discharging electric currents from a rotor part of a machine having a shaft. The discharge device having an axially displaceable contact element received at least partially in a guide unit and serving to form an electrically conductive sliding contact between a sliding contact surface of the contact element and a shaft contact surface of the shaft, the contact element being connected to the guide unit and / or a retaining element of the machine in an electrically conductive manner and being pre-loaded towards the shaft contact surface by a spring element, the contact element being wetted at least partially by an oily fluid, at least one duct being provided at least in sections of the guide unit and / or of the contact element for the oily fluid, the duct being formed by the guide unit and the contact element.

The design method of the non-linear term offset moving-magnet vibrator meets the following conditions: (1) a moving-magnet vibrator body comprises an outer cylinder, a vibration transmission sheet, a stator assembly and a rotor assembly; and (2) the mover assembly is subjected to electromagnetic acting force of pushing force and pulling force in pairs at the same time and presents a push-pull type structural characteristic, so that linear terms in the acting force borne by the mover assembly are overlapped and become larger, and non-linear terms in the acting force borne by the mover assembly are partially or completely counteracted and are reduced, so that the linear terms in the acting force borne by the mover assembly are reduced, and the linear terms in the acting force borne by the mover assembly are reduced. And obtaining the moving magnet type vibrator with the counteracted nonlinear term.

The invention belongs to the technical field of acoustic-electric conversion, and discloses a vibration system of a sound production device and the sound production device. The vibration system of the sounding device comprises a vibrating diaphragm, a vibrating plate and a voice coil assembly. The vibrating diaphragm comprises a central part arranged at the center of the vibrating diaphragm, the vibrating diaphragm is provided with a plurality of mounting holes, and the plurality of mounting holes are arranged around the geometric center of the vibrating diaphragm; the vibrating plate comprises a plurality of vibrating units which are arranged in the mounting holes in a one-to-one correspondence manner; and the voice coil assembly comprises a plurality of voice coils, the plurality of voice coils are in one-to-one correspondence with the plurality of vibration units, and the voice coils are connected to one ends, close to the central part, of the corresponding vibration units. According to the vibration system of the sound production device and the sound production device, the high-frequency characteristic can be improved, and the acoustic performance is ensured.

The invention discloses a sound production device and intelligent glasses, and relates to the technical field of electroacoustic transduction, a first vibration system of a first sound production unit of the sound production device comprises a first vibrating diaphragm assembly and a first voice coil, and a first magnetic circuit system comprises a first magnetic part and a second magnetic part which are arranged on two opposite sides of the first vibrating diaphragm assembly. The first magnetic part and the second magnetic part are respectively provided with a first magnetic gap and a second magnetic gap corresponding to the first voice coil, a second vibration system of the second sound production unit comprises a second vibrating diaphragm assembly and a second voice coil, and a second magnetic circuit system comprises a third magnetic part and a fourth magnetic part which are arranged on two opposite sides of the second vibrating diaphragm assembly. The third magnetic part and the fourth magnetic part are respectively provided with a third magnetic gap and a fourth magnetic gap corresponding to the second voice coil; a first concave edge is formed on the first magnetic part; and / or a second concave edge is formed on the fourth magnetic part. The sound production device provided by the invention has relatively low distortion, can reduce the sound leakage problem of a far field, has good acoustic performance, and is more compact in matching structure with the whole machine.

Provided is a curing reactive organopolysiloxane composition that forms a pressure-sensitive adhesive layer having a high shear storage elastic modulus and stress at 500% strain and having excellent adhesive strength. The organopolysiloxane composition comprises: (A) a chain organopolysiloxane having an alkenyl group; (B) an organopolysiloxane resin having 9 mol % or less of hydroxyl groups and the like, and being a mixture of (b1) an organopolysiloxane resin having a (Mw) of 4500 or more and (b2) an organopolysiloxane resin having a (Mw) of less than 4500; (C) an organohydrogenpolysiloxane; and (D) a hydrosilylation reaction catalyst. A mass ratio of a resin component to a chain siloxane component is within a range of 1.4 to 3.0 A pressure-sensitive adhesive layer obtained by curing the composition has a shear storage elastic modulus G′ at 25° C. of 3.5 MPa or more, and a stress at 500% strain of 0.25 MPa or more.

Provided in the present invention are a sound production unit and an electronic device. The sound production unit comprise: a support; a magnetic circuit system connected to the support and having a first magnetic gap and a second magnetic gap; and a vibration system comprising a first vibration diaphragm and second vibration diaphragm connected to two sides of the support, and a first voice coil and second voice coil connected to the first vibration diaphragm and the second vibration diaphragm, the first voice coil and the second voice coil being respectively located in the first magnetic gap and the second magnetic gap. The first vibration diaphragm comprises a first corrugated rim, a second corrugated rim, and a vibration part, the vibration part being connected to the first voice coil, and the first corrugated rim being connected to the magnetic circuit system. A through hole is provided in the center of the magnetic circuit system, the first corrugated rim surrounding the through hole. Sound waves of the second vibration diaphragm radiate outwards by means of the through hole, and sound waves of the first vibration diaphragm and the second vibration diaphragm radiate outwards on the same side of the sound production unit. Using the present invention can solve the problem that the vibration area and vibration displacement of existing sound production units cannot meet the requirements of wearable audio products such as OWS earphones.

The application provides an acoustic enhancement composite material, a manufacturing method thereof, and a loudspeaker and electronic equipment, wherein the acoustic enhancement composite material is formed by interweaving fibrous materials with each other, has a three-dimensional network structure inside, and has porous powder materials attached to the surfaces of the fibrous materials through a precipitation aid. The acoustic enhancement composite material has high acoustic performance, and the acoustic performance of the porous powder material with the acoustic enhancement function per unit mass is better than that of commonly used acoustic enhancement particles on the market. The acoustic enhancement composite material also has stable acoustic performance, and after high-temperature and high-humidity storage according to the technical content recorded in 7.8.4 of the group standard 'Porous sound-absorbing particles for micro loudspeakers' (standard number: T / CECA 78-2022), the acoustic performance of the acoustic enhancement composite material has no loss.

The invention discloses a loudspeaker assembly and a production method thereof. The loudspeaker assembly comprises a frame and a magnetic circuit assembly. The magnetic circuit assembly comprises a washer, a magnet and T iron which are stacked in sequence, and the washer and the magnet are sleeved on a middle cylinder of the T iron; the basin frame is provided with a connecting part which is combined with the magnetic circuit assembly in a rubber coating mode, the connecting part wraps the peripheral wall of the washer, the peripheral wall of the magnet and the peripheral wall of the T iron, and the connecting part further wraps the end face of the washer and the end face of the T iron. The loudspeaker assembly is high in production efficiency and stable in structure.

There is provided an apparatus (100) comprising: a surface (102) arranged to be mechanically displaced; a first permanent magnet (110) coupled with the surface; at least one supporting member (106) for supporting the surface; a base (104) comprising a second permanent magnet (120) arranged to at least partially face the first permanent magnet at a distance; a coil (122) coupled with the second permanent magnet; and a signal port (130) electrically coupled with the coil, wherein an electrical signal is configured to travel between the signal port and the coil, wherein a magnetic field between the first permanent magnet and the second permanent magnet causes a force to the surface, wherein an entity, comprising the surface and the at least one supporting member, comprises at least one elastic element providing a supporting counterforce acting as a counterforce to the force caused by the magnetic field, causing the surface to be in a force equilibrium state, and wherein the electrical signal in the coil is proportional to mechanic displacement of the surface when the force equilibrium state is broken by the electrical signal in the coil.

The invention relates to the technical field of marketing display, in particular to a mechanical and electrical product marketing decision visual display device which comprises a base and a display screen, a moving mechanism is arranged on the base and comprises a synchronous belt moving on the base, a threaded rod is rotatably arranged in the synchronous belt, a movable sleeve is movably arranged on the threaded rod, and the movable sleeve is movably connected with the base. The bottom of the movable sleeve is connected with a movable column, the outer side of the movable column is sleeved with a suction cup, the synchronous belt is connected with a pushing plate, and a loudspeaker is movably arranged on one side of the pushing plate. A certain angle is formed between the movable door and the baffle plate, and the movable plate drives the loudspeaker to move and be inserted into the loudspeaking groove, so that the sound is diffused, the transmission effect is improved, the sound of the loudspeaker is diffused, and people can hear the sound of the device more clearly.

A design method of a nonlinear term offset moving iron and moving magnetic coil mixed oscillator comprises the steps that (1) an oscillator body is arranged, and the oscillator body comprises an outer cylinder, a first vibration transmission piece, a second vibration transmission piece, a first rotor assembly and a second rotor assembly; and (2) the first mover assembly and the second mover assembly are respectively and simultaneously subjected to electromagnetic acting forces of push force and pull force in pairs to present a push-pull type structural characteristic, so that linear terms in the acting forces borne by the first mover assembly and the second mover assembly are superposed and become larger, and the linear terms in the acting forces borne by the first mover assembly and the second mover assembly become larger. And non-linear terms in the acting force borne by the first rotor assembly and the second rotor assembly are partially or completely counteracted and are reduced, so that the non-linear term counteracted moving iron and moving magnetic coil mixed vibrator is obtained.

The utility model relates to the technical field of horns, and discloses a light module installation structure for furniture horns, which comprises a horn body and a top cover matched with the horn body, a first connecting ring is arranged on the horn body along the outer edge far away from the center line, a first installation groove and a clamping groove are formed in the inner surface of the first connecting ring in a penetrating manner, and the clamping groove is matched with the first installation groove. A reinforcing rib is fixedly installed at the end, close to the first installing groove, of the first connecting ring, a protruding block is fixedly installed at the position, close to the outer edge of the clamping groove, of the first connecting ring, and a lamplight piece is arranged at the end, close to the reinforcing rib, of the loudspeaker body. According to the light module installation structure for the furniture horn, the sliding and buckle connection design of the top cover enables the installation and disassembly operation to be simple and convenient, the interior of the horn is convenient to maintain, the light piece is installed through the fixing ring and the installation bolt, installation and replacement are convenient, and the production and maintenance efficiency is improved; the design of the horn body and the mounting ring and the mounting block of the furniture simplifies the mounting process.

An acoustic device according to one aspect of the present disclosure comprises: an annular magnet 10; a bottom yoke 20 having a mounting surface 21 on which the magnet 10 is placed; a pole piece 30 disposed on the mounting surface 21 inside an inner peripheral surface of the magnet 10; and a top plate 40 disposed on a surface of the magnet 10 that faces a surface on which the magnet 10 is placed on the bottom yoke 20. The top plate 40 has a lower resistivity than the resistivity of the pole piece 30.

The application discloses a spacing structure of a sound production layer, the sound production layer and a display device. The spacing structure comprises a base layer and a spacing layer. The spacing layer is arranged on the base layer. The spacing layer comprises a plurality of spacing protrusions which are spaced apart in a first direction. Each spacing protrusion is arranged on the base layer along a second direction which is perpendicular to the first direction. A spacing groove which provides a space required for sound production is formed between two adjacent spacing protrusions. A plurality of spacers are arranged on each spacing protrusion and protrude away from the surface of the spacing protrusion. The application can reduce the resonance frequency parameter of the driven sound production, that is, in the case of the same sound pressure level, the resonance frequency can be reduced by increasing the rear cavity, and the resonance frequency is more stable, and thus the requirement of the processing technology is reduced.

The utility model relates to the technical field of loudspeaker production equipment, and discloses a loudspeaker diaphragm pasting jig which comprises a base, a lifting mechanism is arranged in the middle of the base, a supporting mechanism is arranged on the upper portion of the lifting mechanism, and a loudspeaker body is arranged in the middle of the upper side of the supporting mechanism. The periphery of the worm gear is rotatably connected to the upper portion of the inner side of the base, the middle of the worm gear is in threaded connection to the periphery of the limiting rod, the periphery of the worm is rotatably connected to the interior of the base, the worm and the worm gear are meshed with each other, and one end of the worm penetrates through a wall shell of the base and is fixedly connected with a rotary knob. According to the pasting jig for the loudspeaker diaphragm, the rotary knob is screwed, so that the worm drives the worm gear to rotate, the limiting rod moves up and down, the height of the supporting mechanism can be adjusted conveniently, people of different heights can use the pasting jig conveniently, a circle is defined by the multiple supporting seats, a loudspeaker body is located in the circle, and the pasting jig is convenient to use. And the loudspeaker body can be limited, the use is convenient, and the processing efficiency is improved.

The utility model relates to the technical field of sound boxes, in particular to a sound box mounting structure convenient for heat dissipation, which comprises a shell and a mounting box mounted in the shell, two loudspeakers are symmetrically arranged on one side in the mounting box up and down, the shell at least comprises a main shell, the bottom of the main shell is fixedly connected with a bottom shell, and the bottom of the main shell is fixedly connected with the bottom shell. A plurality of cooling fins are arranged in the bottom shell, and the cooling fins are tightly attached to the bottom of the mounting box, so that heat generated in the sound box is effectively conducted to the bottom shell and is dissipated to the external environment through the hexagonal heat dissipation holes, the heat dissipation efficiency is improved, the structural strength and stability of the sound box are enhanced, and the service life of the sound box is prolonged. And the fixing seats for limiting the mounting box are fixedly arranged at the edges of the four corners of the inner wall of the bottom shell, and the fixing seats adopt L-shaped upper surface design and are tightly attached to the side walls and the bottom surface of the mounting box, so that the left and right positions of the mounting box in the shell are ensured to be accurately and stably fixed, and the shaking or shifting phenomenon possibly occurring in the operation process of the sound box is avoided.

A vehicle, comprising a speaker. The speaker has an acoustic metamaterial unit. The acoustic metamaterial unit comprises a main body having a cavity formed therein, and inner walls of the cavity comprise a first side wall and a second side wall disposed opposite each other. At least one of the first side wall and the second side wall is provided with an extension portion extending towards the other of the first side wall and the second side wall, and a free end of the extension portion is spaced apart from the other of the first side wall and the second side wall.