615 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 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 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 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.

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 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.

The present application discloses a speaker box, including a casing with an accommodating cavity, and a sounding unit fixed in the accommodating cavity and dividing the accommodating cavity into a closed rear acoustic cavity and a front acoustic cavity communicated with an outside of the casing. The sounding unit is further provided with a heat exchange member, and a heat exchange cavity is formed in the heat exchange member. The heat exchange cavity is filled with a heat exchange medium, and part of the heat exchange element is exposed to the sounding unit. Compared with the prior art, in the present application, the sounding unit is provided with a heat exchange member. When the speaker box is in the working state, the sounding unit vibrates and generates heat, and the heat is conducted to the heat exchange medium in the heat exchange member through a wall of the heat exchange member. The heat exchange medium is in contact with the outside air of the sounding unit for heat exchange to release heat, thereby improving the heat dissipation efficiency of the speaker box.

Various implementations include audio devices. Certain implementations include an audio device including: an outer enclosure, an acoustic cavity within the outer enclosure, and at least one hidden connection point in the outer enclosure, the at least one hidden connection point configured to receive a corresponding fastener by penetrating the outer enclosure.

The utility model provides an acoustic enhancement particle layer structure in a loudspeaker and the loudspeaker, the acoustic enhancement particle layer structure is arranged in a sound cavity which is at least enclosed by a shell of the loudspeaker and a loudspeaker monomer fixed on the shell, and the acoustic enhancement particle layer structure in the loudspeaker comprises a first bonding layer, a second bonding layer, a third bonding layer and a fourth bonding layer, the first bonding layer is arranged on the top wall, opposite to the loudspeaker single body, of the sound cavity, so that a bonding top surface opposite to the loudspeaker single body is formed on the top wall of the sound cavity; the first particle layer is formed by a plurality of acoustically-enhanced particles, and the first particle layer is bonded to the bonding top surface. The acoustic enhancement granular layer structure is used for replacing a powder sheet in a loudspeaker, and solves the problem that the powder sheet cannot well adapt to the shape of a three-dimensional space in the loudspeaker.

The invention relates to the technical field of semiconductors, in particular to an MEMS micro loudspeaker packaging structure and a preparation method thereof, and the packaging structure comprises a substrate which is provided with a hollow cavity structure, a limiting device and a plurality of vent holes in the bottom; and the MEMS sound production chip is inversely arranged on the substrate, and the edge area of the MEMS sound production chip is bonded with the substrate through the connecting part. According to the packaging structure of the MEMS micro loudspeaker provided by the invention, the MEMS sound production chip is inversely arranged and is in direct contact with the substrate used for packaging, so that the packaging structure has higher impact resistance, the inversely arranged MEMS sound production chip can better dissipate heat, and a double-sound-cavity structure in the packaging structure increases system damping and reduces the quality factor of device resonance; the stability and reliability of the chip can be improved, the design of multiple vent holes is combined with the limiting device, the nonlinear displacement of the MEMS sound production chip under the resonant frequency is effectively inhibited, and the total harmonic distortion is reduced.

A bulk acoustic wave (BAW) device comprises a piezoelectric layer disposed between a first electrode layer and a sandwich electrode. The sandwich electrode includes a first layer of a first material having a first acoustic impedance and a second layer of a second material having a second acoustic impedance that is less than the first acoustic impedance of the first layer. The second layer of the sandwich electrode having the lower acoustic impedance is disposed between the first layer and the piezoelectric layer. The sandwich electrode combined with the piezoelectric layer and first electrode can cause the BAW device to resonate at a frequency whose wavelength corresponds to an acoustic cavity length of the BAW device, depending on an acoustic mirror included on one side of the BAW device. In one example, the acoustic cavity length is about 1.5 times of the resonant frequency wavelength.

The invention discloses a structure and method for decoupling pipeline system bypass pipeline flow acoustic resonance, a branch pipe is connected to the pipe wall of a main pipeline to form a three-way pipe structure, one ends of a plurality of bypass pipelines are communicated to the branch pipe, the other ends of the bypass pipelines extend respectively, and the tail ends of the bypass pipelines are closed. The vortex at the joint of the main pipeline and the branch pipeline falls off to generate the pressure pulsation frequency, if the acoustic cavity modal frequency of the branch pipelines is coupled with the pressure pulsation frequency to cause flow acoustic resonance, the communicating pipeline is additionally arranged to communicate the two branch pipelines, so that the acoustic cavity modal frequency of the branch pipelines is changed, and the acoustic cavity modal frequency of the branch pipelines is changed. And the acoustic cavity modal frequency is far away from the pressure pulsation frequency, and decoupling is carried out. And therefore, noise elimination and vibration reduction of a pipeline system can be realized.

The invention relates to the field of semiconductor devices, and provides an MEMS loudspeaker, a manufacturing method thereof and electronic equipment. The MEMS loudspeaker comprises a substrate and a vibrating diaphragm located on the upper side of the substrate in the thickness direction, a sound cavity is formed between the vibrating diaphragm and the upper portion of the substrate in the thickness direction, a sound hole is formed in the lower side of the substrate in the thickness direction, and the sound cavity is communicated with the sound hole. And the size of at least one part of the sound cavity in the thickness direction in the horizontal direction is larger than the size of at least one part of the sound hole in the thickness direction in the horizontal direction. Therefore, the sound cavity and the sound hole are respectively formed at the upper side and the lower side of the substrate, and the substrate widths at the left side and the right side of the sound cavity are narrower than the substrate widths at the left side and the right side of the sound hole, so that the effective working area of the vibrating diaphragm is ensured, the strength of the substrate is enhanced, the conditions of wafer fragments or chip breakage are avoided, the performance of the MEMS loudspeaker can be improved, and the manufacturing cost of the MEMS loudspeaker is reduced. And the production cost can also be reduced.

Vibration sensors are provided. The vibration sensor may include: a vibration assembly, the vibration assembly including a mass element and an elastic element, and the mass element being connected to the elastic element; a first acoustic cavity, the elastic element constituting one of sidewalls of the first acoustic cavity, and the vibration assembly vibrating to make a volume of the first acoustic cavity change in response to an external vibration signal; an acoustic transducer, the acoustic transducer being in communication with the first acoustic cavity and the acoustic transducer generating an electrical signal in response to a volume change of the first acoustic cavity; and a buffer, the buffer limiting a vibration amplitude of the vibration assembly, wherein the acoustic transducer has a first resonance frequency, the vibration assembly has a second resonance frequency, and the second resonance frequency of the vibration assembly is smaller than the first resonance frequency.

The utility model discloses a lamp with a sound box. The lamp comprises a lampshade, a radiator, a light source, a loudspeaker and a rear sound cavity, the radiator is arranged in the lampshade, and the interior of the radiator is hollow; the plurality of light sources are arranged on the outer side of the radiator; the loudspeaker is arranged at one end of the radiator, and the loudspeaker is communicated with the interior of the radiator, so that the rear sound cavity is formed in the radiator. The light source is arranged on the outer side of the radiator, the interior of the radiator is hollow, the loudspeaker is arranged at one end of the radiator, the loudspeaker is communicated with the interior of the radiator, and the internal space of the radiator can serve as a rear sound cavity of the loudspeaker. The lamp has the sound playing function, meanwhile, the internal space of the radiator is effectively utilized, the radiator can play a role in radiating the light source and improving the acoustic effect, multiple purposes are achieved, the space in the lampshade is saved, and the cost can be saved.