848 results about "Acoustic cavity" patented technology

The invention discloses a sound production device and a sound production 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 sound production device is connected with a magnetic circuit system, the outer periphery of an outer folding ring is connected with a shell, and a voice coil is connected with a first vibrating plate; the diaphragm and the second diaphragm assembly are sequentially arranged on the side, facing the voice coil, of the first diaphragm assembly and located on the outer side of the voice coil, the diaphragm is a flexible piece, the outer edges of the diaphragm and the second diaphragm assembly are both connected with the shell, and the inner edge of the diaphragm and the inner edge of the second diaphragm assembly are both connected with the first vibrating plate. A sound production cavity communicated with the sound outlet hole is formed between the diaphragm and the second vibrating diaphragm assembly; wherein a first rear cavity is defined between the first vibrating diaphragm assembly and the diaphragm, a second rear cavity is defined among the first vibrating diaphragm assembly, the second vibrating diaphragm assembly, the shell and the magnetic circuit system, and the first rear cavity is communicated with the second rear cavity. According to the sound production device, the effective vibration area of the vibration system is increased, and the acoustic performance is improved.

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 a sound production 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 a vibration system of the sound production 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 outer periphery of the folding ring part of the second vibrating diaphragm assembly is connected with the shell, the first bending part of the second vibrating plate is connected with the inner edge of the diaphragm, and the outer edge of the diaphragm is connected with the shell, so that a sound production cavity communicated with the sound outlet hole of the shell is formed between the diaphragm and the second vibrating diaphragm assembly; two ends of the rigid connecting piece are respectively connected with the second vibrating diaphragm assembly and the voice coil, so that the voice coil drives the second vibrating diaphragm assembly to vibrate through the rigid connecting piece; wherein the effective vibration area Sd1 of the diaphragm is smaller than the effective vibration area Sd2 of the second diaphragm assembly, and the ratio of the Sd1 to the Sd2 is 1: 1.5-1: 3. According to the sound production device, the effective vibration area of the vibration system is increased, and the acoustic performance is improved.

The invention discloses a sound production device and a sound production module, and relates to the technical field of electroacoustic transduction, a central magnetic part of a magnetic circuit system of the sound production device comprises a first central magnet, a central magnetic conductive plate and a second central magnet which are stacked, and the magnetizing directions of the first central magnet and the second central magnet are opposite; a receding space is formed between every two adjacent side magnetic parts, the inner side of an inner folding ring of a first vibrating diaphragm assembly of the vibrating system is connected with the center magnetic part, a diaphragm and a second vibrating diaphragm assembly are sequentially arranged on the side, facing the magnetic conductive yoke, of the first vibrating diaphragm assembly, and a sound production cavity communicated with a sound production hole of the shell is formed between the diaphragm and the second vibrating diaphragm assembly. The first extension part of the second diaphragm assembly is correspondingly connected with the second extension part of the diaphragm and extends to the avoiding space, the rigid connecting piece is arranged in the avoiding space, the rigid connecting part of the rigid connecting piece is connected with the first extension part, and the fourth extension part of the rigid connecting piece is connected with the voice coil. According to the sound production device, the effective vibration area of the vibration system is increased, and the acoustic performance is improved.

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 present disclosure may provide a sound-producing device comprising a diaphragm and a housing. The housing may include a first sound guide hole and a second sound guide hole. The diaphragm may be disposed in the housing. A first acoustic cavity and a second acoustic cavity are located on both sides of the diaphragm. The first sound guide hole is acoustically coupled to the first acoustic cavity, and the second sound guide hole is acoustically coupled to the second acoustic cavity. The first sound guide hole includes a first hole part and a second hole part. The first hole part and the second hole part are connected, the first hole part is located at a first side wall of the housing, the second hole part is located at a second side wall of the housing, and the first side wall and the second side wall are two adjacent side walls of the housing.

The invention discloses an earthquake early warning device and method based on campus broadcast, and the method comprises the steps: carrying out the building response coupling analysis through receiving an early warning signal of an earthquake monitoring center, generating an earthquake magnitude-building coupling feature, and mapping the earthquake magnitude-building coupling feature into an enhanced early warning source adaptive to an acoustic environment; acoustic cavity detection is carried out based on threatened area identification, and differential playing topology is constructed; extracting a high-risk gathering area through personnel density scanning, generating personalized evacuation guiding content and determining a playing priority; high-precision time sequence control is realized by adopting a synchronous reference anchor point technology, and a multi-mode playing domain is constructed through carrier modulation and frequency division multiplexing; and finally, an acoustic navigation field is utilized to guide accurate scheduling and playing of audio signals, differential playing and accurate coverage of early warning information can be realized according to the anti-seismic characteristics and acoustic environment characteristics of different buildings, and an intelligent acoustic solution is provided for campus earthquake early warning.

The invention discloses a portable music physiotherapy player capable of improving sleep, and belongs to the technical field of music physiotherapy. A portable music physiotherapy player capable of improving sleep comprises a player shell, a loudspeaker shell is arranged in the player shell, a sound outlet cavity is formed in the front end of the loudspeaker shell in a penetrating mode, and a filling piece is arranged between the sound outlet cavity and the loudspeaker shell. According to the high-fidelity portable music player, the problems that in an existing high-fidelity portable music player, a gap generated at the position of a loudspeaking hole continuously exists, and air at the position of the loudspeaking hole enables external foreign matter to smoothly penetrate through and enter the device are solved, a pressing piece can be pressed to drive a filling piece to move along a first sliding rail, and the device is convenient to use. And the state of the filling sheet embedded into the second groove is adjusted to fill and wrap the sound outlet cavity, so that external foreign matters are prevented from penetrating through the sound outlet cavity and entering the player shell in the carrying process.

The invention discloses an in-vehicle vocal cavity modeling method and system, electronic equipment and a storage medium, and the method comprises the steps: carrying out the partitioning of an in-vehicle region, and obtaining different vocal cavity partitioning regions; establishing a vocal cavity grid model according to the boundaries of different vocal cavity block areas; a first acoustic material attribute is given to at least one of the passenger compartment sound cavity, the trunk sound cavity, the vehicle door sound cavity and the rear side wall sound cavity, and a second acoustic material attribute is given to at least one of the seat sound cavity, the central control instrument panel sound cavity and the hat and coat stand sound cavity; according to the first acoustic material attribute of at least one of the passenger compartment acoustic cavity, the trunk acoustic cavity, the vehicle door acoustic cavity and the rear side wall acoustic cavity and the second acoustic material attribute of at least one of the seat acoustic cavity, the central control instrument panel acoustic cavity and the hat and coat stand acoustic cavity, acoustic cavity modal analysis is carried out on the acoustic cavity grid model, and the frequency of the acoustic cavity modal is obtained. The method can effectively improve the precision of the vocal cavity model, so that the reliability of simulation analysis and optimization of the low-frequency noise of the vehicle body can be improved.

The utility model provides a broadband silencer and an engine air inlet system. The broadband silencer comprises an air inlet pipe, an air outlet pipe, a silencer shell connected between the air inlet pipe and the air outlet pipe, and a resonance sound absorption structure arranged in the silencer shell. The resonance sound absorption structure is made of an elastic vibration material and is configured to be tubular; the resonance sound absorption structure is connected between the air inlet pipe and the air outlet pipe and forms an air inlet channel together with the air inlet pipe and the air outlet pipe. The inner diameter of the silencer shell is larger than the outer diameter of the resonance sound absorption structure, and a silencing cavity is formed between the silencer shell and the resonance sound absorption structure. According to the broadband silencer, elastic vibration of the resonance sound absorption structure enables the silencing cavity to form a resonance cavity, energy of noise is converted into vibration kinetic energy, and therefore the silencing performance of the broadband silencer can be improved.

The invention discloses a catastrophe early warning system for a tunnel passing through an active fault zone, and relates to the technical field of tunnel early warning, the system comprises a multi-mode sensing layer used for obtaining micro-seismic wave, vibration, inclination and strain data along the tunnel fault zone, the multi-mode sensing layer comprises an optical fiber distributed sound wave sensing unit DAS, a data processing unit DAS and a data processing unit DAS, the optical fibers are arranged along the inner side of the tunnel lining at intervals of 10m and are used for monitoring tiny sound wave signals of a fracture surface in real time; the MEMS accelerometer arrays are arranged at four corners of each section and are used for detecting high-frequency vibration; gNSS and INS combined inclination strain sensors which are installed on the top plate and the side wall of the tunnel and are used for obtaining millimeter-level inclination and strain changes; and the acoustic cavity sensor is arranged in a near area of the sliding surface of the fault zone and is used for capturing an air sound wave precursor signal. According to the invention, through multi-mode fusion sensing, the function of capturing fracture micro-shock, vibration and deformation in all directions is realized, the problem of missed alarm and false alarm of single sensing is solved, the sensitivity order of magnitude is improved, and the false alarm rate is reduced.

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 application relates to the technical field of terminals, and discloses an electronic device and a cover. The electronic device comprises a cover, a display screen assembly and a main body. The cover is used for shielding a gap between the display screen assembly and the main body. The cover comprises a first part and a second part which are connected. The first part covers at least part of the edge of the display screen assembly. The second part extends from the first part towards the main body. The inside of the main body comprises an acoustic cavity, and the cover and / or the main body is provided with an acoustic outlet channel which is connected to the acoustic cavity and the outside of the mobile phone. The acoustic outlet of the acoustic outlet channel has an area greater than 0 in the region of the orthographic projection of the side projection plane. The side projection plane is perpendicular to the plane in which the display screen assembly is located and parallel to the edge of the display screen assembly corresponding to the acoustic outlet channel. The electronic device described above cannot be observed from the front, the acoustic outlet channel and the internal components cannot be observed, the appearance is improved, meanwhile, the size space of the display screen assembly can be increased, and the space utilization rate of the electronic device is improved.

The invention discloses a low-frequency broadband sound absorption metamaterial structure based on metal foam and a metamaterial sound barrier, the metamaterial structure comprises a metal foam layer and a composite resonant sound cavity layer, and the metal foam layer and the composite resonant sound cavity layer are stacked; the composite resonance sound cavity layer comprises a mother cavity structure and a son cavity structure, the son cavity structure is embedded in the mother cavity structure, and the mother cavity structure and the son cavity structure are both provided with openings facing the metal foam layer, so that incident sound waves can enter the mother cavity structure and the son cavity structure after propagating through the metal foam layer; cavities of the primary cavity structure and the secondary cavity structure are one-way uniform-section cavities. The low-frequency and broadband high-efficiency sound absorption composite material is applied to the field of acoustic noise reduction, achieves low-frequency and broadband high-efficiency sound absorption performance, has high rigidity and strength and excellent environmental adaptability, can bear loads, is good in environmental tolerance and excellent in fireproof performance, is suitable for various complex and severe environments, ensures a long-term stable working state, is convenient to manufacture in batches at low cost, and has wide application prospects. And the economic feasibility is improved.

The invention relates to a parallel Helmholtz resonant cavity with adjustable sound absorption performance, and the resonant cavity comprises a main body cavity which is internally provided with a plurality of sound absorption cavities in parallel, and the top surface of each sound absorption cavity is provided with a first sound absorption hole and a second sound absorption hole at an interval along a first direction; the upper cover plate is slidably connected with the main body cavity in the first direction, a plurality of communicating areas are arranged on the upper cover plate, and a plurality of third sound absorption holes and fourth sound absorption holes are formed in each communicating area at intervals in the first direction; the plurality of sound absorption cavities and the plurality of communication areas are arranged in a one-to-one correspondence manner; the PVC gel drivers are connected with the upper cover plate, the corresponding first sound absorption holes and the corresponding third sound absorption holes are overlapped and communicated when the PVC gel drivers are not powered on, and the PVC gel drivers contract when the PVC gel drivers are powered on so that the corresponding second sound absorption holes and the corresponding fourth sound absorption holes can be overlapped and communicated. Through the design of the parallel sound absorption cavities, low-frequency broadband sound absorption with multiple sound absorption peaks is generated, and further, the low-frequency broadband sound absorption effect aiming at different frequencies is achieved on the premise that the size parameters and the structures of the sound absorption cavities are not changed.

The silencing body comprises a first wall and a second wall which are arranged in a spaced mode, at least one partition plate is connected between the first wall and the second wall so that at least one sound cavity can be formed between the first wall and the second wall, and an opening penetrating through the wall thickness is formed in the part, corresponding to the sound cavity, of one of the first wall and the second wall; when the number of the sound cavities is at least two, the structures and the sizes of all the sound cavities are the same, and all the sound cavities correspond to the preset target frequency, so that the noise elimination body can perform noise elimination and noise reduction on the noise of the target frequency; wherein when the size parameter of the sound cavity is determined, the target frequency of the noise absorbed by the sound cavity is acquired; determining a frequency correction coefficient; obtaining a correction frequency according to the frequency correction coefficient and the target frequency; and designing size parameters of the acoustic cavity according to the correction frequency. The silencing body corresponds to the target frequency to be eliminated, the silencing and noise reduction effect is good, and the silencing body can be modularized easily.

The invention discloses an acoustic cavity structure, a manufacturing method thereof and electronic equipment. The sound cavity structure comprises a middle frame assembly, a screen assembly and a loudspeaker, the middle frame assembly comprises a middle frame and a sealing dustproof piece, the middle frame comprises a first through hole, and the sealing dustproof piece comprises a second through hole. The sealing dustproof piece is attached to the second surface of the middle frame and covers the first through hole, and the first through hole is communicated with the second through hole. The screen assembly is attached to the first surface of the middle frame, and the loudspeaker is attached to the sealing dustproof piece. The loudspeaker comprises an open cavity facing the first through hole, and the open cavity, the second through hole, the first through hole and the screen assembly define an equivalent sound cavity of the loudspeaker. By adopting the loudspeaker with the open cavity, the thickness of the acoustic cavity structure can be reduced. In this way, the electronic equipment can be lightened and thinned, and meanwhile the equivalent sound cavity can be used for providing a working cavity with the same or higher size for the loudspeaker. The sound cavity structure can be effectively sealed, so that the electronic equipment can be effectively waterproof, and the audio performance of the loudspeaker can be ensured.

The utility model discloses an earphone, and the earphone comprises a sound production part, and the sound production part comprises a first housing which is used for forming a first accommodation cavity; the sound production assembly is arranged in the first containing cavity and comprises two loudspeakers, each loudspeaker comprises a vibrating diaphragm, the two loudspeakers are assembled and matched with each other in the axis direction so that a first acoustic cavity can be formed between the two loudspeakers, and the sound production assembly and the first shell are matched with each other; a first acoustic cavity is formed in the first shell, a second acoustic cavity isolated from the first acoustic cavity is formed between the sound production assembly and the first shell, the first shell is provided with a sound outlet hole communicated with the first acoustic cavity and a pressure relief hole communicated with the second acoustic cavity, and sound produced on one sides of vibrating diaphragms of the two loudspeakers is output through the first acoustic cavity and the sound outlet hole. And sound generated by the other sides of the vibrating diaphragms of the two loudspeakers is output through the second acoustic cavity and the pressure relief hole. In this way, the sound quality of the earphone can be improved.

The invention discloses a wind noise simulation method, device and equipment based on a commercial vehicle and a medium. The method comprises the following steps: constructing a whole vehicle grid model matched with a target commercial vehicle to be subjected to noise simulation; importing the whole vehicle grid model into a pre-constructed blank simulation model framework to obtain a basic simulation model; setting free attribute parameters and material attribute parameters of the basic simulation model according to regional noise characteristics and material attributes of each key region in the whole vehicle grid model to obtain an external noise simulation model and an internal vocal cavity simulation model; and operating the external noise simulation model and the internal vocal cavity simulation model to obtain a wind noise simulation result of the target commercial vehicle. According to the embodiment of the invention, a comprehensive wind noise simulation result is provided, a powerful basis is provided for vehicle noise control and optimization, analysts are helped to identify noise sources and evaluate the effect of noise control measures, and vehicle design is optimized to reduce the noise level.

A loudspeaker includes a housing having a plurality of walls that together define an acoustic cavity. An electro-acoustic transducer is mounted to a front wall of the housing, and an axis of motion of the electro-acoustic transducer is offset from a centroid of the front wall. The loudspeaker is configured to be stacked with another loudspeaker having the same configuration in a first configuration such that the stacked loudspeakers radiate acoustic energy to produce an omnidirectional radiation pattern; and the loudspeaker is configured to be stacked with the other loudspeaker in a second configuration such that the stacked loudspeakers radiate acoustic energy to produce a cardioid radiation pattern. The loudspeaker includes a keying feature that does not interlock and thereby prevent stacking when the loudspeaker is in a first orientation relative to the other loudspeaker, and that interlocks to allow stacking when the loudspeaker is in a second orientation relative to the other loudspeaker.

Provided are a core module and an earphone. The core module may include a core housing, and a speaker and a bracket provided in the core housing. The bracket and the speaker may enclose to form an acoustic cavity, the core housing may be provided with an acoustic hole, the bracket may be provided with an acoustic channel connecting the acoustic hole and the acoustic cavity, the bracket may cooperate with the core housing to form a first adhesive-containing groove surrounding at least a portion of the acoustic hole, and the first adhesive-containing groove may contain a first adhesive for sealing an assembly gap between the bracket and the core housing.

A vibration sensor (200) is provided, comprising: a vibration receiver (210) including a housing (211) and a vibration unit (212), the housing (211) forming an acoustic cavity, the vibration unit (212) being located in the acoustic cavity and separating the acoustic cavity into a first acoustic cavity (213) and a second acoustic cavity (214); and an acoustic transducer (220) acoustically connected to the first acoustic cavity (213). The housing (211) is configured to generate a vibration based on an external vibration signal, the vibration unit (212) changes an acoustic pressure within the first acoustic cavity (213) in response to the vibration of the housing (211), causing the acoustic transducer (220) to generate an electrical signal. The vibration unit (212) includes a quality element (2121) and an elastic element (2122), an area of the quality element (2121) on a side away from the acoustic transducer (220) is smaller than an area of the quality element (2121) on a side close to the acoustic transducer. The elastic element (2122) is connected around a side wall of the quality element (2121).

The invention provides an acoustic cavity structure and a method and device for determining the acoustic cavity structure, and is applied to the technical field of audio equipment. The acoustic cavity structure comprises an acoustic front cavity and an acoustic rear cavity; at least one sound leakage hole is formed in the acoustic rear cavity; the at least one sound leakage hole comprises a first sound leakage hole; the forming angle of the first sound leakage hole belongs to a first angle interval; the forming angle of the first sound leakage hole is an angle required by the wearing position reference shaft to rotate to a connecting line between the first sound leakage hole and the gravity center of the acoustic rear cavity according to a preset direction. According to the acoustic cavity structure, the sound leakage prevention effect of the open type wearable audio equipment can be improved.

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.

Disclosed in the present invention are a sound production module and an electronic device. The sound production module comprises a sound production unit and a module housing. The sound production unit is provided with a first vibration assembly and a second vibration assembly, the vibration direction of the first vibration assembly being disposed at an included angle to the vibration direction of the second vibration assembly; the module housing has an accommodating space, the sound production unit being disposed within the accommodating space, a rear sound cavity being formed between the sound production unit and the module housing, and the module housing having a sound outlet portion for transmitting sound waves of the first vibration assembly and the second vibration assembly to the outside. The present invention provides a sound production module capable of effectively widening the frequency band, and the sound production module has a good sound production effect.

The invention belongs to the technical field of vibration and noise of structures, and discloses a rapid calculation method and system for calculating vibration noise of an acoustic excitation cabin by combining multiple software. According to the method, sound cavity wall surface pressure data of each frequency under internal sound excitation are obtained through Comsol, and the data are processed into cabin structure wall surface node pressure data under each frequency. And an Abaqus fluid-solid coupling model is established, the wall surface of the shell is coupled with an external water area, proposed node pressure data is applied to the wall surface of the cabin structure as a pressure load, and the vibration response of the cabin structure at each frequency is analyzed and calculated through steady-state dynamics. And importing the obtained vibration response data into Virtual Lab software, mapping a displacement response result to a water acoustic grid, and calculating a vibration noise result of the underwater cabin structure through a boundary element module.

The application relates to the technical field of human-computer interaction, in particular to a pressure input key based on a microphone and a method, which comprises a microphone, a sound transmission hole, a pressure sensing structure and a processing unit; the microphone is integrated in the interior of an electronic device; the sound transmission hole is arranged on the shell of the electronic device and is in communication with the microphone to form an acoustic channel; the pressure sensing structure is a ring structure arranged around the sound transmission hole, and the pressure sensing structure is provided with at least one gap to form a neck part connecting the sound transmission hole and the atmosphere; the processing unit is integrated in the interior of the electronic device and is in communication connection with the microphone. Compared with the prior art, the application solves the problem that an additional pressure sensor / capacitance sensor needs to be added to measure the pressing level in the prior art. According to the scheme, a micro variable sound cavity capable of changing with the contact and pressing degree of a finger is constructed at the microphone, the correlation between the acoustic signal and the pressing form is established, and thus the pressing level can be calculated by monitoring the acoustic signal collected by the microphone.

The invention discloses a gas sensor and gas detection equipment, and is applied to the technical field of gas detection. The photoacoustic detection unit comprises a sound pressure detection module and a light source module, the sound pressure detection module comprises a sound pressure detector and a shell covering the sound pressure detector, an acoustic cavity is formed in the shell, and the acoustic cavity is provided with a gas hole used for leading in external environment gas; the light source module is used for emitting light with a preset wavelength into the acoustic cavity so as to generate a photoacoustic signal in the acoustic cavity, and the sound pressure detector is used for generating an electric signal based on the photoacoustic signal. The photoacoustic signals are directly generated in the acoustic cavity, a back cavity in an existing sound pressure detector can be integrated with a photoacoustic cell, the photoacoustic cell does not need to be additionally arranged, and therefore the size of the gas sensor is further reduced.

The invention relates to the technical field of earphone noise reduction, and discloses an active noise reduction method and device for a head-mounted wireless earphone and the head-mounted wireless earphone. The method comprises the following steps of: performing time division multiplexing sampling through double microphone arrays of left and right acoustic cavities of the earphone to obtain four paths of microphone array sampling data and performing correlation function beam forming calculation to generate sound source direction distribution data; calculating a geometric acoustic path difference of the earphone, and establishing a direction delay parameter table corresponding to each effective sound source direction; driving a multi-channel adaptive filter bank according to the direction delay parameter table, performing directional filtering, and generating a directional inversion signal group; and taking the intensity information in the sound source direction distribution data as a weighting coefficient to perform weighted synthesis on the directional inversion signal group, forming a comprehensive inversion signal, applying a feedforward delay correction value, and outputting a self-adaptive noise reduction signal. According to the method, continuous and stable noise reduction performance can be kept in a complex dynamic multi-sound-source environment, and the auditory experience of a user is remarkably improved.