1389 results about "Second sound" patented technology

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, and the shell is provided with a first sound outlet hole; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm; the voice coil is at least partially arranged in the magnetic gap of the magnetic circuit system, and the middle diaphragm and the second diaphragm are located outside the voice coil; the outer edges of the second vibrating diaphragm and the middle diaphragm are connected with the shell, and the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating plate of the first vibrating diaphragm; a second sound production cavity communicated with the first sound production hole is formed between the second vibrating diaphragm and the middle diaphragm; a first rear cavity is defined by the first vibrating diaphragm and the middle diaphragm, and a second rear cavity communicated with the first rear cavity is defined by the first vibrating diaphragm, the second vibrating diaphragm and the shell.

The utility model discloses a sound production device, a sound production module and electronic equipment, the sound production device comprises a shell, a magnetic circuit system and a vibration system, the shell is provided with an accommodating space, and the shell is provided with a first sound outlet hole; the magnetic circuit system is arranged in the accommodating space and is provided with a magnetic gap; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm; the voice coil is at least partially arranged in the magnetic gap, the voice coil is connected with the first diaphragm, and the second diaphragm and the middle diaphragm are located on the outer side of the voice coil; the outer edges of the second vibrating diaphragm and the middle diaphragm are connected with the shell, and the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating diaphragm; and a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm and is communicated with the first sound outlet hole.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibrating diaphragm assembly of the sound production device comprises a first vibrating diaphragm, a second vibrating diaphragm and a vibrating plate, the first vibrating diaphragm and the second vibrating diaphragm are arranged at an interval along a first direction and are respectively connected with two ends of a voice coil along the first direction, and the vibrating plate is located at the inner side of the voice coil and is connected with the first direction. The vibrating plate has magnetic conductivity, an edge magnetic part of the magnetic circuit system is arranged between the first vibrating diaphragm and the second vibrating diaphragm and is located on the outer side of the voice coil, two center magnets of a center magnetic part are located on the two opposite sides of the vibrating plate, the two center magnets are magnetized in the first direction, and the magnetizing directions are opposite; the sounding device forms a first cavity and a second cavity on two sides of the vibrating plate, and is provided with a first sounding hole and a second sounding hole which are respectively communicated with the first cavity and the second cavity, and the two central magnets are respectively exposed in the first cavity and the second cavity. According to the sound production device, the BL value is effectively increased, the acoustic performance is improved, and the sound leakage problem of a far field can be reduced.

A system may include a storage device, configured to store computer-executable instructions. A system may include an ear-bud configured to be positioned within an ear canal of a user, the ear-bud comprising: a speaker, a microphone; and one or more processors in communication with the storage device, wherein the computer-executable instructions, when executed by the one or more processors, cause the one or more processors to: obtain a user hearing profile, obtain an equal-loudness hearing profile, receive audio data from the microphone, and generate a second audio data based on a first sound-pressure level, a second sound-pressure level, a first frequency; and cause the speaker to emit the second audio data within the ear canal of the user, such that the user perceives the audio data as if the user has normal hearing.

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, the shell is provided with a first sound outlet hole, and the shell comprises a first shell and a second shell; the magnetic circuit system is fixed on the second shell and is provided with a magnetic gap; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, and the outer edge of the first vibrating diaphragm is fixed on the first shell; the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the outer edge of the second vibrating diaphragm is clamped between the first shell and the second shell; the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm, and the outer edge of the middle diaphragm is connected with the first shell; the voice coil is at least partially arranged in the magnetic gap; the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating diaphragm; and a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm and is communicated with the first sound outlet hole.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibrating diaphragm assembly of a vibrating system of the sound production device comprises a first vibrating diaphragm, a second vibrating diaphragm and a vibrating plate, the first vibrating diaphragm and the second vibrating diaphragm are arranged at an interval along a first direction and are respectively connected with two ends of a voice coil along the first direction, and the vibrating plate is located at the inner side of the voice coil and is connected with the first direction. An edge magnetic part of the magnetic circuit system is arranged between the first vibrating diaphragm and the second vibrating diaphragm and located on the outer side of the voice coil, two center magnets of a center magnetic part are located on the two sides of the vibrating plate in the first direction, the two center magnets are magnetized in the first direction, and the magnetizing directions are opposite; the sounding device forms a first cavity and a second cavity on two sides of the vibrating plate, and is provided with a first sounding hole and a second sounding hole which are respectively communicated with the first cavity and the second cavity, and the two central magnets are respectively exposed in the first cavity and the second cavity. According to the sound production device, the BL value is effectively increased, the acoustic performance is improved, and the sound leakage problem of a far field can be reduced.

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.

The invention discloses an acoustic system, an ear wearable device and a head-mounted intelligent equipment, the acoustic system comprises an audio device, a sound guide part and a sound output part, the sound guide part and the audio device are separately arranged, the input end of the sound guide part is arranged at the output end of the audio device, and the output end of the sound output part is arranged at the output end of the audio device. The sound output part is arranged at the output end of the sound guide part, the sound guide part is communicated with the audio device through a first sound hole, the cross section area of one end, close to the first sound hole, of the sound guide part is larger than that of the first sound hole, the sound output part is formed by at least one second sound hole, and the second sound hole is communicated with the first sound hole. The area of the cross section of one end, close to the sound output component, of the sound guide component is larger than that of the cross section of each second sound hole. The method can effectively improve the audio quality, and is applied to the technical field of head-mounted intelligent equipment such as intelligent glasses.

The utility model relates to the field of fuel gas pressure regulation, in particular to a double-layer noise reduction valve cage and a regulating valve, which comprises an inner-layer valve cage, a plurality of first noise reduction holes, a second-layer valve cage and a third-layer valve cage, the outer-layer valve cage is arranged outside the inner-layer valve cage in a sleeving manner and fixedly connected with the inner-layer valve cage, and a plurality of second silencing holes which are arranged according to a second rule are formed in the outer-layer valve cage; and the inner-layer valve cage and the outer-layer valve cage are coaxially arranged. According to the utility model, the inner-layer valve cage is used for preliminarily dispersing pressure waves and noise of fluid through the plurality of first silencing holes arranged according to the first rule, the outer-layer valve cage is used for further absorbing and scattering residual noise generated by the inner-layer fluid through the second silencing holes, and the inner-layer valve cage and the outer-layer valve cage are coaxially arranged; the additional flow resistance generated when fluid penetrates through different layers can be reduced, and meanwhile the continuity of a flow channel is guaranteed. Under the conditions of high pressure difference and large flow, noise of the regulating valve is effectively reduced, it is ensured that the noise level does not exceed 85 decibels, and the requirements of specific application occasions are met.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a first vibrating diaphragm and a second vibrating diaphragm of the sound production device are arranged at an interval along a first direction and are respectively connected with two ends of a voice coil along the first direction, a vibrating plate is located at the inner side of the voice coil, and an edge magnetic part is arranged between the first vibrating diaphragm and the second vibrating diaphragm and located at the outer side of the voice coil. The side magnetic part is a Halbach magnetic circuit, the Halbach magnetic circuit is provided with a magnetic field enhancement side facing the voice coil, two center magnets of the center magnetic part are located on the two sides of the vibration plate in the first direction, the two center magnets are magnetized in the first direction, and the magnetizing directions are opposite; the sounding device forms a first cavity and a second cavity on two sides of the vibrating plate, and is provided with a first sounding hole and a second sounding hole which are respectively communicated with the first cavity and the second cavity, and the two central magnets are respectively exposed in the first cavity and the second cavity. According to the sound production device, the BL value is effectively increased, the acoustic performance is improved, and the sound leakage problem of a far field can be reduced.

The invention provides electronic equipment. The electronic equipment comprises a first display screen, a first sound production area, a second sound production area and a second display screen, the first display screen comprises a first display area and a second display area, and when the electronic equipment is in a folded state, the first display area of the first display screen is opposite to the second display area of the first display screen; the first display area of the first display screen and the second display screen are stacked; wherein the first display screen is arranged on a first surface of the electronic equipment, the second display screen is arranged on a second surface of the electronic equipment, the first surface is connected with the second surface through a frame, the first sound production area is arranged on the first surface and / or the frame, and the second sound production area is arranged on the second surface and / or the frame; the first sound production area is used for producing sound when the electronic equipment is in an unfolded state, and the second sound production area is used for producing sound when the electronic equipment is in a folded state.

The invention discloses a spatial projection regularization method for sound source localization and sound field reconstruction and a related device, and belongs to the technical field of sound source localization. Specifically, according to the method, an equivalent source method model is utilized, and an external radiation sound field of a sound source to be measured is simulated through a series of virtual sources. Then, according to the first sound pressure transfer matrix from the virtual source arrangement surface to the holographic measuring point plane and the sound pressure of the holographic measuring point, a space projection regularization algorithm is used for solving the inverse problem, and therefore the equivalent source intensity is obtained; and then, reconstructing an external radiation sound field of the sound source to be detected by using the second sound pressure transfer matrix and the equivalent source intensity. And finally, by taking the maximum sound pressure amplitude as a standard, screening field points in an external radiation sound field so as to determine the position of the sound source to be detected. According to the space projection regularization algorithm, truncation processing of the vector space is carried out with the projection size of the measurement information in the vector space as the criterion, real information is reserved, and noise interference is restrained to the maximum extent.

The invention provides a flow guide ring structure, a fan assembly, an air conditioner and a noise reduction control method thereof.The flow guide ring structure comprises a flow guide ring, a noise reduction unit is arranged on the periphery of the flow guide ring, the noise reduction unit comprises a first sound absorption assembly, and the first sound absorption assembly comprises a first shell cover, a first partition plate and a first movable plate; the first shell cover covers the peripheral face of the flow guide ring to form a first cavity, the first cavity is divided by the first partition plate into a first sound absorption cavity and a second sound absorption cavity, the first sound absorption cavity and the second sound absorption cavity are different in size, and a plurality of first communicating holes are formed in a first perforated plate section of the first partition plate in a penetrating mode. The first movable plate is movably arranged on the first perforated plate section so as to adjust the number of the shielded first communicating holes. According to the flow guide ring structure, self-adaptive adjustment and noise reduction can be carried out according to the change of the operating parameters, so that noise of different frequencies generated under different operating parameters is effectively reduced, the frequency range of effective noise reduction is widened, the noise reduction effect is improved, and the mute experience comfort of a user is improved.

The invention belongs to the technical field of laser, and discloses a laser beam splitting and combining device based on an acousto-optic deflector pair and application thereof, and the laser beam splitting and combining device comprises a transmitting optical fiber module, a first acousto-optic deflector, a diaphragm, a second acousto-optic deflector and a receiving optical fiber module which are sequentially arranged; the first acousto-optic deflector and the second acousto-optic deflector are arranged in parallel; the transmitting optical fiber module is used for transmitting laser to the first acousto-optic deflector; the first acousto-optic deflector and the second acousto-optic deflector are used for deflecting, splitting or combining laser beams; the diaphragm is used for blocking secondary diffracted light except the primary diffracted light; and the receiving optical fiber module is used for receiving the laser emitted from the second acousto-optic deflector. Therefore, the technical problems that in the prior art, the laser beam splitting function and the laser beam combining function are mutually independent, two kinds of operation cannot be considered in the same device, and real-time regulation and control over the light beam operation mode are lacked are solved.

A filter device includes first and second acoustic wave resonators each including a support, a piezoelectric layer that has an X-axis, a Y-axis, and a Z-axis that are crystal axes and is made of Y-cut lithium niobate, and an IDT electrode including first and second electrode fingers. When a thickness of the piezoelectric layer is d and a center-to-center distance of the first and second electrode fingers and the second electrode fingers adjacent to each other is p, d / p is less than or equal to 0.5. An absolute value of a first slant angle α1 differs from an absolute value of a second slant angle α2.

The invention discloses a fully-implanted artificial cochlea system and a noise reduction method thereof.The fully-implanted artificial cochlea system comprises an implant and a fully-implanted microphone, the fully-implanted microphone comprises a shell, a PCBA board, a first sound sensor and a bone conduction sensor are arranged in the shell, the first sound sensor is connected with the PCBA board and used for receiving a first external sound signal and transmitting the first external sound signal to the PCBA board, and the bone conduction sensor is connected with the implant. The bone conduction sensor is also connected with the PCBA board and is used for collecting an in-vivo noise signal and transmitting the in-vivo noise signal to the PCBA board; the PCBA board is used for receiving the first external sound signal and the in-vivo noise signal, and at least performing noise reduction on the first external sound signal and then outputting the first external sound signal; the implant or the fully-implanted microphone is connected with a second sound sensor, the second sound sensor is connected with the PCBA, the second sound sensor receives a second external sound signal and transmits the second external sound signal to the PCBA board, and the PCBA board receives the second external sound signal, at least carries out noise reduction on the second external sound signal and then outputs the second external sound signal; according to the system, the wearing comfort of a user is effectively improved, the efficient noise reduction performance is met, and the hearing requirement of a user patient can be met.

A system for hearing assistance includes an array of microphones, which are configured be mounted in proximity to a head of a user of the system and to output electrical signals in response to first acoustic waves that are incident on the microphones. A speaker is configured for mounting in proximity to an ear of the user and configured to output second acoustic waves in response to a drive signal applied to the speaker. Processing circuitry is configured to generate the drive signal by amplifying and filtering the electrical signals using a beamforming filter that emphasizes first sounds that impinge on the array of microphones within a selected angular range while suppressing second sounds that are spoken by the user.

The invention discloses a formation decoupling sound source localization method and device based on deep learning and a readable medium, and the method comprises the steps: constructing and training a sound source localization model, and obtaining a trained sound source localization model; acquiring a first sound source signal received by a first microphone and a second sound source signal received by a second microphone in the microphone array; calculating generalized cross-correlation frequency domain representation between the first sound source signal and the second sound source signal based on the first sound source signal and the second sound source signal; obtaining a frequency domain feature based on the guide vector between the first microphone and the second microphone and the generalized cross-correlation frequency domain representation; determining an input feature based on the frequency domain feature, and inputting the input feature into a trained sound source localization model to obtain a candidate sound source angle and a confidence coefficient corresponding to the candidate sound source angle; and post-processing the candidate sound source angle to obtain a sound source positioning result. The invention solves the problems that the existing sound source localization method based on deep learning is large in calculated parameter quantity and cannot be applied to embedded equipment and the like.

A rear panel, which is an external member, includes a frame portion including multiple sound radiation holes including a first sound radiation hole, a second sound radiation hole, and a third sound radiation hole. A first sloping portion is disposed within an area of the first sound radiation hole and is inclined with respect to a thickness direction of the frame portion towards a first direction non-parallel to the thickness direction, and a second sloping portion is disposed within an area of the second sound radiation hole and is inclined with respect to the thickness direction of the frame portion towards a second direction different from the first direction and non-parallel to the thickness direction, and the third sound radiation hole includes a surface parallel to the thickness direction of the frame portion.

The embodiment of the invention provides a voice recognition test method and device, equipment and a computer storage medium, and relates to the field of Internet of Things. The method comprises the steps that a target noise environment is constructed, the target noise environment comprises a first sound source, a second sound source and intelligent equipment, and the positions and orientations of the first sound source, the second sound source and the intelligent equipment are determined through test parameters; selecting the voice instruction as a target instruction, playing the target noise through the first sound source, and playing each target instruction through the second sound source; for each target instruction, determining an identification result of the target instruction according to feedback information of the intelligent equipment; the identification result is used for representing whether the intelligent device successfully identifies the target instruction; the feedback information is operation executed by the intelligent equipment or returned information after the target instruction is played; and determining the recognition accuracy of the intelligent device in the target noise environment according to the recognition result of each target instruction. According to the method, the standardization of the test process is realized, and the reference of the identification result is improved.

The invention provides a sound effect control method and electronic equipment, and relates to the technical field of terminals. The audios played by the electronic equipment have similar sound effects in different use states, so that the sound effect stability of the electronic equipment is ensured. The method is applied to the folding screen electronic equipment, and comprises the following steps: the electronic equipment plays a first audio with a first sound effect through a first loudspeaker and a second loudspeaker in a first use state, the first loudspeaker performs playing by adopting a first sound effect parameter, and the second loudspeaker performs playing by adopting a second sound effect parameter. And in response to user operation, switching to a second use state, playing the first audio with a second sound effect through the first loudspeaker and the second loudspeaker, the first loudspeaker playing with the third sound effect parameter, and the second loudspeaker playing with the fourth sound effect parameter. The first sound effect parameter is different from the third sound effect parameter, the deviation between the second sound effect and the first sound effect is smaller than a first threshold value, and the first use state and the second use state are related to the folding state of the electronic equipment.

A first acoustic wave device can have a piezoelectric layer between a first electrode and a second electrode. The first acoustic wave device can have a first shape and a first area. A second acoustic wave device can be coupled to the first acoustic wave device to at least partially cancel a second harmonic response of the first acoustic wave device. The second acoustic wave device can have a piezoelectric layer between a first electrode and a second electrode. The second acoustic wave device can have a second shape that is different from the first shape and a second area that is within a threshold amount of the first area.

The electronic device includes: a rear housing; a middle frame, where the middle frame is connected to the rear housing; a display, where the display is connected to the middle frame; and a sound-making system, where the sound-making system includes a housing and a speaker, the speaker is disposed in the housing, a first sound-making module and a second sound-making module are disposed in the speaker, and the housing is provided with a first sound-making hole and a second sound-making hole. The electronic device is provided with a first sound output portion and a second sound output portion, where the first sound output portion is provided closer to the display than the second sound output portion; or the first sound output portion is located inside the display, and the second sound output portion is located outside the display.

The invention concerns a method for processing an audio signal containing a plurality of in particularly timely synchronized audio signals, wherein the plurality of audio signals comprises a first voice sound portion from a first sound source and at least one second voice sound portion from a second sound source spatially distanced from the first sound source; and at least a non-voice portion and each audio signal of the plurality of audio signals recorded by a microphone of a plurality of microphones, wherein the microphones of the plurality of microphones are spatially separated from each other. The plurality of recorded audio signals are processed to obtain voice tracks and the position of the sound sources and generate one or more audio objects therefrom, these audio objects configured to be played back on a variety of sound systems.

An electronic device includes a casing, a first sound-emitting device and a second sound-emitting device. The first sound-emitting device includes a basket, a vibration system and a magnetic circuit system. The vibration system includes a diaphragm and a voice coil. The magnetic circuit system includes a magnetic bowl, a magnetic unit and an auxiliary magnetic. The first sound-emitting device further includes an upper shell and a front cavity. The first sound-emitting device further includes a first elastic damping member. The diaphragm, the magnetic bowl, the basket and the first elastic damping member are sealed and enclosed to form a first rear cavity, and the first sound-emitting device, the second sound-emitting device and the casing are enclosed to form a second rear cavity. The sound-emitting device of the present invention with good vibration damping effect, high frequency response sensitivity and better acoustic performance.

This invention discloses a broadband composite sound insulation structure, including a first sound insulation mechanism and a second sound insulation mechanism. The first and second sound insulation mechanisms are disposed opposite to each other, with a closed air layer formed between them. Through the arrangement of the first, second, and air layers, the broadband composite sound insulation structure of this invention can effectively reduce and suppress broadband noise, including high-frequency, mid-frequency, and low-frequency noise. By incorporating the first and second sound insulation panels, noise reduction can be achieved while minimizing external environmental pollution to both the first and second sound insulation layers.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a first vibrating diaphragm and a second vibrating diaphragm of a vibrating diaphragm assembly of the sound production device are arranged at an interval along a first direction and are respectively connected with two ends of a voice coil along the first direction, and a vibrating plate is located at the inner side of the voice coil. Two central magnets of a central magnetic part of the magnetic circuit system are opposite and are arranged on two opposite sides of the vibrating plate at an interval; wherein each of the first vibrating diaphragm and the second vibrating diaphragm comprises a deformation part, and a first end and a second end which are arranged at the two ends of the deformation part along the first direction, the two first ends are respectively connected with the two ends of the voice coil, and at least parts of the two second ends are respectively connected with the edge magnetic part; a first cavity and a second cavity which are located on the two sides of the vibration plate in the first direction are formed in the sound production device, and the sound production device is further provided with a first sound outlet hole and a second sound outlet hole which are communicated with the first cavity and the second cavity respectively. According to the sound production device, the BL value is effectively increased, the acoustic performance is improved, and the sound leakage problem of a far field can be reduced.

The present application relates to an abnormal signal detection device using a dual acoustic wave sensor. The abnormal signal detection device using a dual acoustic wave sensor comprises: a housing including a first acoustic wave transmission portion and a second acoustic wave transmission portion; a base substrate located inside the housing and including a first surface and a second surface; a first acoustic wave sensor mounted on the first surface and converting an acoustic wave in a first band into a first electrical signal; a second acoustic wave sensor mounted on the second surface and converting an acoustic wave in a second band into a second electrical signal.

A loudspeaker arrangement comprises a first loudspeaker comprising a first sound radiating surface and a first speaker basket, and a second loudspeaker comprising a second sound radiating surface and a second speaker 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. The first loudspeaker basket is directly coupled to the second loudspeaker basket, thereby forming a third projection that defines an opening of the cavity. The third projection forms a first point of contact on a first side of the loudspeaker arrangement. The first loudspeaker basket and the second loudspeaker basket further form at least one additional point of contact at a second side of the loudspeaker arrangement, opposite the first side in a second direction.

The present disclosure discloses a vehicle headrest including a main body having a receiving chamber and a first sound hole, and a speaker module including a housing fixed to the main body and including a sound outlet, a speaker unit including a diaphragm, and an acoustic inverting tube. The housing further comprises a back sound hole communicated with the coupling back cavity; the acoustic inverting tube is received in the coupling back cavity. The sound wave output from the back sound hole has a first sound phase, the sound wave output from the sound outlet has a second sound phase, a difference between the first sound phase and the second sound phase is in a range of 2π / 3-4π / 3. The vehicle headrest in the present disclosure has better sound quality and higher acoustic privacy.