76 results about "Acoustic cavity" patented technology

Provided is a speaker, including: a diaphragm structure including first and second diaphragms, the first diaphragm is configured to push air to vibrate to generate initial sound wave, and a signal of which is modulated based on a signal within an audible sound frequency band; and a cover plate structure enclosing with the diaphragm structure to form sound-generating cavity, the cover plate structure has a sound outlet hole connecting the sound-generating cavity with outside, the initial sound wave in the sound-generating cavity is transmitted to the outside through the at least one sound outlet hole to form a sound signal, the second diaphragm and the cover plate structure generate an acoustic environmental impedance used to modulate the initial sound wave to change sound pressure of the sound signal. The speaker can modulate and output a sound signal covering the audible sound frequency band based on the acoustic environmental impedance.

The application provides an electromagnetic acoustic module, a lead frame structure and a manufacturing method, relates to the technical field of microelectronic devices, and the electromagnetic acoustic module comprises a packaging base, a lead frame embedded in the packaging base, a chip arranged on a chip bearing part, a coil support and a coil arranged on a first surface, a magnetic circuit system and a vibration system arranged on a side of the coil support away from the packaging base, and an upper cover surrounding the packaging base to form an acoustic cavity. The chip bearing part is located in a side area of the module plane, and in a plane perpendicular to the thickness direction of the packaging base, the orthographic projection of the chip bearing part and the orthographic projection of the coil support are separated from each other. In this way, the chip package and the magnetic circuit system and the vibration system can be prevented from being stacked in series in the thickness direction of the module, thereby providing a structural basis for low profile of the module, effectively improving product size precision, vibration system resonance frequency consistency, reducing manual adjustment and processes, and reducing costs compared with the existing production method.

A kind of sound box, including cabinet and the protective cover being arranged in the front of cabinet, first acoustic cavity is equipped in the cabinet, high pitch loudspeaker assembly and bass horn assembly are equipped on the first acoustic cavity, second acoustic cavity is also equipped in the cabinet, the first acoustic cavity is communicated with second acoustic cavity by loudspeaker pipe passing through partition, the loudspeaker pipe is fixedly connected with cabinet, one end of the loudspeaker pipe is arranged in the back of high pitch loudspeaker assembly, the other end of the loudspeaker pipe is inserted into second acoustic cavity. By adding a second acoustic cavity in the cabinet and the loudspeaker pipe that is communicated with the first acoustic cavity and the second acoustic cavity, and one end of the loudspeaker pipe is arranged in the back of the high pitch loudspeaker assembly, the manufacturer selects loudspeaker pipe with different pipe diameter and different length according to actual situation, so that the inside of the loudspeaker pipe helps the reflection and resonance of sound waves, so that the utility model shows more rich tone, and then the sound performance comparable to real musical instrument.

This application relates to the field of terminal device technologies, and in particular, to a resonant cavity antenna and an electronic device. The resonant cavity antenna is used in the electronic device having a metal housing, and the electronic device includes an audio module. The resonant cavity antenna has a closed internal cavity, and the internal cavity is configured to communicate with an audio chamber of the audio module to serve as a portion of an acoustic cavity of the audio module. The resonant cavity antenna includes a dielectric substrate, and a metal sheet and a metal ground that are fastened to the dielectric substrate. The metal sheet and the metal ground are spaced apart, a ground point of the metal sheet is conductively connected to the metal ground, and the metal sheet and the metal ground form a resonant cavity body. An electromagnetic wave sent or received by the resonant cavity antenna may be reflected in the resonant cavity body. The internal cavity is at least partially located between the metal sheet and the metal ground. The resonant cavity antenna uses its own structure to expand a volume of the acoustic cavity of the audio module, so that sound quality of the audio module can be optimized.

The invention relates to an ultrasonic testing device and to a method for nondestructively testing a component, in particular a fiber-plastic composite component, having: an ultrasonic testing head; and a liquid nozzle with a liquid inlet, a liquid outlet, and an inner surface which tapers towards the liquid outlet, wherein the liquid nozzle has at least one liquid guiding rib which protrudes inwards into the sound chamber from the tapering inner surface of the liquid nozzle upstream of the ultrasonic testing head.

This invention relates to the field of vehicles, providing a housing structure, a rear bumper assembly, a vehicle body, and a vehicle. The housing structure includes a housing body with a receiving groove for accommodating a pressure relief valve on a rear side panel. The housing body can be positioned on the outside of the rear side panel of the vehicle, and an exhaust passage communicating with the pressure relief valve is formed between the receiving groove and the rear side panel. The exhaust passage has an exhaust port facing the rear end of the vehicle. When the vehicle is in motion, the airflow outside the vehicle bypasses the housing body and flows towards the rear end of the vehicle. Since the exhaust port of the exhaust passage faces the rear end of the vehicle, the airflow outside the exhaust passage passing through the exhaust port causes minimal pressure changes within the exhaust passage, resulting in minimal pressure differential fluctuations between the exhaust passage and the inner side of the rear side panel. This effectively reduces the frequency and amplitude of the pressure relief valve's flapping action, thereby reducing low-frequency noise generated by pressure differential fluctuations in the acoustic cavity and ensuring passenger comfort.

This application provides an open-type audio device, a sound field control method, and related apparatus, relating to the field of acoustic technology. The device includes an acoustic cavity and multiple sound emitters, sensing components, and control components fixed within the acoustic cavity. The acoustic cavity has a first sound leakage hole and a second sound leakage hole, used to determine the initial distribution and control direction of the external sound field, respectively. The sensing components are used to acquire the target location of an external person. The control components adjust the driving voltage of the sound emitters according to the target location to adjust the external sound field distribution, ensuring the target location is at the lowest possible sound leakage position. By fixing multiple sound emitters within the acoustic cavity and providing the first and second sound leakage holes, combined with the synergistic effect of the sensing and control components, this application dynamically adjusts the external sound field distribution according to the target location of an external person, significantly reducing sound leakage at the target location, thereby minimizing interference with external personnel and protecting user privacy.

The embodiment of the application relates to the technical field of robot control, and particularly relates to a robot multi-cavity sound production device.The device comprises a control module and at least one sound production module; the control module comprises a processor and a signal driver; the sound production module comprises a vibration module and an acoustic cavity in communication with the vibration module; the sound production module is in communication connection with the signal driver of the control module through a cable or a wireless communication module, the vibration module is arranged to be driven by the control module to generate an initial sound wave, the acoustic cavity is arranged to acoustically process the initial sound wave, and when the sound production module is multiple, the multiple sound production modules are arranged at different positions of a head, a neck or a trunk of a robot body respectively.The device can simulate the spatial listening of human sound production and the sound characteristics of the common sound production of multiple positions, enhances the authenticity of robot sound production, makes the robot output have natural human voice characteristics, enhances the immersion and naturalness of human-computer interaction, and improves the interaction experience.

This utility model discloses a sound guiding structure for an earphone with high and low frequency units, comprising an earphone shell and a speaker unit. The speaker unit divides the cavity into a front cavity and a rear cavity. The speaker unit is a coaxial dual speaker, comprising: a ring-shaped woofer and a tweeter located at the center of the woofer, with the woofer and tweeter having the same sound-emitting surfaces. A sound guide is provided inside the earphone shell, and a through-type tweeter channel is provided within the sound guide. One end of the tweeter channel is connected to the sound-emitting surface of the tweeter, and the other end extends to the mouthpiece. The sound generated by the woofer enters the front cavity and is then conducted out through the mouthpiece. The sound generated by the tweeter is directly conducted out through the tweeter channel. This utility model uses a coaxial dual speaker, and the sound guide directly conducts the sound generated by the tweeter through the tweeter channel, avoiding the attenuation caused by resonance and sound wave reflection of the high-frequency energy of the tweeter in the front cavity.

Embodiments of the present application provide an electronic device, comprising a first sound emitting module and a second sound emitting module located in a shell. The first sound emitting module comprises a first diaphragm and a shell surrounding the first diaphragm, and the shell and the first diaphragm jointly form a sound cavity. The second sound emitting module has a second diaphragm, one side of the second diaphragm communicates with the outside of the shell, and the other side communicates with the inside of the shell. The first sound emitting module further comprises a phase adjusting member, which is used to radiate sound waves in the sound cavity to the inside of the shell and adjust the phase of the sound waves radiated to the inside of the shell to be opposite to the phase of the sound waves in the sound cavity, so that the phase of the sound waves radiated by the sound cavity to the inside of the shell is opposite to the phase of the sound waves radiated by the second diaphragm to the inside of the shell. In this way, the two sound waves with opposite phases can be mutually offset in the inside of the shell, which can effectively weaken the sound wave intensity in the inside of the shell, reduce or avoid resonance of the shell of the electronic device, and effectively reduce or avoid vibration of the shell of the electronic device.

1. Name of this design: Sound-emitting cavity of smoke sensor housing. 2. Application of this design: Overall, it is used to cover and protect the internal components of the smoke sensor; in a localized manner, it is used for the sound-emitting cavity of the smoke sensor. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1. 5. Other situations requiring explanation: The content within the dashed line does not constitute the content of the design for which protection is sought.

An earphone adapted for being worn on an ear is provided. The earphone includes an acoustical component and a wearing component. The wearing component is connected to the acoustical component, and the acoustical component and the wearing component together form an acoustic chamber. The wearing component includes a positioning portion, a sound output surface and an acoustic sound outlet. The acoustic sound outlet is located on the sound output surface and connected to the acoustic chamber. When the earphone is worn on the ear, the positioning portion extends into the ear and abuts against a cavum conchae of the ear, and the sound output surface faces an ear canal of the ear.

The present application relates to the technical field of computer, disclose a kind of saxophone sound physical modeling computer simulation method.The method comprises: according to saxophone geometric parameter and fingering configuration, its acoustic cavity is divided into multiple acoustic sub-sections;The geometric characteristics of each sub-section are modeled using one-dimensional non-uniform digital waveguide, two-dimensional axisymmetric finite difference time domain or three-dimensional boundary element local resonance unit respectively;Interface coupling model is constructed to meet the continuity of sound pressure and the conservation of volume velocity;Combined with the reed excitation model based on the nonlinear Bernoulli equation, the sound field state of each unit is calculated synchronously by multi-rate time domain recursion algorithm, and high-fidelity audio data stream is output.The present application improves the simulation efficiency significantly while ensuring the timbre fidelity through heterogeneous modeling and multi-rate strategy, and realizes the collaborative optimization of precision and real-time.

The application describes a microphone, which comprises: a microphone body; a support movably connected with the microphone body; an audio interface assembly arranged on the support, the audio interface assembly comprising at least three different types of audio interfaces, the audio interfaces being connected with external devices through external wires; thus, the microphone of the application can have multiple types of audio interfaces to meet the connection requirements of different devices, and the audio interfaces are arranged on the support, so as not to occupy the internal space of the microphone body, to provide space for subsequent optimization of the acoustic cavity, or to arrange more sound effect function modules in the microphone body to enrich the functions of the microphone; in addition, since the audio interfaces are arranged on the support, when the microphone body is adjusted in angle, the external wires connected with the audio interfaces will not be pulled, so as to ensure the stable connection of the audio interfaces and the external wires, thereby improving the stability of the signal connection.

This invention provides a method for noise reduction using reflected waves in a motorcycle muffler. A reflective noise reduction device is installed inside the muffler's cylinder, dividing the internal portion of the muffler into a first noise reduction cavity and a second noise reduction cavity. The first noise reduction cavity is connected to the second noise reduction cavity via the reflective noise reduction device. The method involves the following steps: after a sound wave enters the first noise reduction cavity, part of the sound wave is silenced by passing through the first noise reduction cavity and the reflective noise reduction device; another part of the sound wave, as an incident sound wave, enters the reflective noise reduction device and is reflected by the smooth, flat walls of the device. The reflected sound wave and the incident sound wave undergo destructive interference, resulting in amplitude reduction or cancellation. The remaining sound wave enters the second noise reduction cavity for further silencing, and finally, the remaining sound wave is discharged. This invention achieves noise reduction through active control of the reflected wave, significantly improving noise reduction performance within the limited space of a motorcycle muffler.

Embodiments of the present application provide a sound cavity assembly and a sound collecting device. The sound cavity assembly comprises a shell and an acoustic module. A shell wall of the shell forms an incoming sound area. The incoming sound area forms a plurality of sound absorption holes. The incoming sound area comprises a middle area and an outer wrapping area. The outer wrapping area surrounds the outer periphery of the middle area. The aperture of the sound absorption holes on the outer wrapping area is smaller than the aperture of the sound absorption holes in the middle area. The acoustic module is arranged in the shell and corresponds to the incoming sound area. The sound cavity assembly provided by the embodiments of the present application can form a counter-rotating vortex reaction in the interior of the shell by setting the aperture of the sound absorption holes on the outer wrapping area to be smaller than the aperture of the sound absorption holes in the middle area, slow down the airflow, reduce the energy of the airflow, and further reduce the noise generated by the airflow on the acoustic module, thereby improving the wind noise resistance of the sound cavity assembly and improving the sound pickup quality.

The application discloses a sound production device and an electronic equipment, wherein the sound production device comprises a shell and a sound production unit, the shell is provided with a containing cavity, a sound outlet and a resonance cavity, the sound production unit is arranged in the containing cavity, the sound production unit comprises a diaphragm, the diaphragm divides the containing cavity into a front sound cavity and a narrow rear sound cavity, the sound outlet is communicated with the front sound cavity, the rear sound cavity is configured as a closed structure, and the resonance cavity is provided with a communicating hole and communicated with the rear sound cavity through the communicating hole. The technical scheme of the application can improve the standing wave valley problem of the sound production device, thereby improving the flatness of the frequency response curve and improving the sound quality.

The invention relates to the technical field of micro electromechanical systems, in particular to a micro electromechanical loudspeaker hybrid system which comprises an acoustic cavity. The acoustic cavity is provided with: a micro electromechanical loudspeaker; an acoustic sensor, arranged on a substrate which is the same substrate on which the micro electromechanical loudspeaker is arranged; a microprocessor, arranged on the substrate, an input end of the microprocessor is connected with the acoustic sensor, and an output end of the microprocessor is connected with a driving end of the micro electromechanical loudspeaker. According to the micro-electro-mechanical loudspeaker hybrid system, the loudspeaker can be monitored through the acoustic sensor, the sensitivity is better, distortion is overcome, and the loudspeaker is protected.

This utility model relates to the field of electroacoustic product technology, and discloses a loudspeaker module and electronic device. The loudspeaker includes a metal front shell, a metal rear shell, a bracket, a loudspeaker unit, a metal mesh, and a support frame. The metal rear shell and the metal front shell are joined to form a chamber; the bracket is fixed inside the metal front shell; the loudspeaker unit is fixed to the metal front shell, and the periphery of the loudspeaker unit abuts against the inner sidewall of the bracket to divide the chamber into isolated front and rear acoustic chambers; the metal mesh is disposed inside the rear acoustic chamber and covers the loudspeaker unit; the support frame is disposed inside the rear acoustic chamber and fixed to the metal rear shell, and the support frame and the metal mesh are press-fitted together. This utility model can effectively reinforce the metal mesh and the loudspeaker unit, making the loudspeaker module structure more stable, reducing the risk of mechanical drop failure, preventing shell vibration and abnormal noise, and ensuring that the rear acoustic chamber has a sufficiently large space to improve acoustic performance.

The present invention relates to the technical field of acoustic-electric conversion. Disclosed are a loudspeaker and an electronic device. The loudspeaker comprises: a diaphragm structure, the diaphragm structure comprising a first diaphragm and a second diaphragm, the first diaphragm being used for driving air to vibrate so as to emit an initial sound wave, and the signal of the initial sound wave being modulated on the basis of a signal of an audible sound frequency band; and a cover plate structure, wherein the cover plate structure and the diaphragm structure defines a sound production cavity, sound outlet holes are formed in the cover plate structure, the sound outlet holes communicate the sound production cavity with the outside, the initial sound wave in the sound production cavity is transmitted to the outside through the sound outlet holes to form a sound signal, the second diaphragm and the cover plate structure form an acoustic environment impedance, and the acoustic environment impedance is used for modulating the initial sound wave to change the sound pressure of the sound signal. The loudspeaker and the electronic device provided by the present invention can perform modulation on the basis of acoustic environment impedance, so as to output a sound signal covering an audible sound frequency band.

An earphone adapted to be worn on an ear is provided. The earphone includes a wearing component and an acoustical component. The wearing component includes a rear positioning portion and an acoustic channel. The acoustical component is connected to the wearing component, and the acoustical component includes an acoustic chamber, and the acoustic chamber is connected to the acoustic channel. When the earphone is worn on the ear, the wearing component is located in a cavum conchae of the ear, and the rear positioning portion exerts a positioning force on a rear edge of the cavum conchae, so that the earphone is positioned in the ear. The acoustic channel corresponds to an ear canal of the ear.

This invention discloses an intelligent nutritional analysis food weighing device based on artificial intelligence, belonging to the field of intelligent weighing equipment technology. The device consists of a weighing base module, a supporting column module, and an intelligent display terminal module. The base is a Φ220mm milky-white acrylic thin disc, housing a built-in four-quadrant high-precision weighing sensor and main control board, achieving accurate weighing from 0-5kg / 1g. The column is a Φ30mm×300mm smooth cylinder, with internal cable channels, an independent acoustic cavity speaker, and a noise-reducing microphone array, supporting long-distance voice interaction up to 1.5 meters. The top 4-inch IPS touchscreen is tilted back 10°, integrating an AI recognition chip and a 2-megapixel camera, equipped with a CNN deep learning model, capable of recognizing over 3000 foods within 1.5 seconds. This invention achieves integrated weighing, recognition, calculation, interaction, and management, offering high precision, simple operation, a pleasant appearance, and strong adaptability, making it widely applicable to scenarios such as postpartum care centers, hospital nutrition departments, rehabilitation institutions, and family health management.

An acoustic turbine fan airfoil apparatus is disclosed. An example apparatus includes a platform of a turbofan engine, the platform including a perforation to receive an acoustic wave; an acoustic cavity protruding from a first side of the platform, the acoustic cavity aligned with the perforation in a radial direction defined by the turbofan engine, the acoustic cavity to attenuate the acoustic wave; and an airfoil protruding from a second side of the platform opposite the first side of the platform.

The utility model belongs to electroacoustic transducer technical field discloses a moving coil type sound head and microphone. The moving coil type sound head includes shell, first sound pickup subassembly and second sound pickup subassembly, the inside of shell has acoustic cavity, shell has the sound inlet, acoustic cavity is connected with outside through sound inlet, first sound pickup subassembly includes first magnet and first sound film, is provided with first coil on first sound film, first sound film is opposite sound inlet and is arranged in acoustic cavity, first magnet is arranged in acoustic cavity, first sound film vibration drives first coil to move relatively first magnet and produces electric current, second sound pickup subassembly includes second magnet and second sound film, second magnet is arranged in acoustic cavity, second sound film and first sound film are along the propagation direction of sound wave in acoustic cavity and are spaced, are provided with second coil on second sound film, second sound film vibration drives second coil to move relatively first magnet and produces electric current. The moving coil type sound head improves the sensitivity of sound signal acquisition, can better capture and restore sound signal.

The invention relates to a method for configuring a photoacoustic chamber unit and to a photoacoustic chamber unit that comprises a resonator (30) defining an interior space (31), and at least one acoustic detector (15) adapted for detecting sound waves generated in a medium contained in the interior space (31). One of the modes that are generated in the interior space (31) and being defined by the geometry of the interior space (31) and the acoustic measurement frequency is selected as a measurement mode, and, if there is another disturbing mode that overlaps with it, then an opening (39) or openings (39) are formed for the selective and relative damping of the interfering mode at certain locations in the wall of the resonator (30).

This invention discloses a composite sound-absorbing structure based on acoustic black holes, comprising multiple coplanar acoustic black hole units containing nested Helmholtz resonators. Each unit includes multiple perforated plates connected in series and a Helmholtz resonator with a nested cavity connected to its end. This composite structure increases the equivalent acoustic cavity length through the nested cavity, significantly enhancing low-frequency sound absorption performance below 200Hz, achieving excellent subwavelength sound absorption characteristics while maintaining a compact thickness. Through parameter optimization of the unit coplanarity and target frequency band, the total thickness at the 86Hz sound absorption peak is approximately λ / 50, and an average sound absorption coefficient of 0.8604 within the 226–1000Hz range can be achieved with a total thickness of less than 70 mm. The nested cavity design improves acoustic control flexibility, enabling precise control of complex low-frequency broadband noise. It possesses advantages such as small size, wide bandwidth, and strong low-frequency absorption, making it suitable for high-end noise control fields such as aerospace and shipbuilding, with broad application prospects.

A muffler body, a server muffler, and a server. The muffler body comprises a first wall (11) and a second wall (12) arranged spaced apart, wherein at least one partition plate is connected between the first wall (11) and the second wall (12), so that at least one acoustic cavity (13) is formed between the first wall (11) and the second wall (12). A portion of one of the first wall (11) and the second wall (12) corresponding to the acoustic cavity (13) is provided with an opening (14) penetrating through the wall thickness. When the number of the acoustic cavities (13) is at least two, all of the acoustic cavities (13) have the same structure and size, and all of the acoustic cavities (13) correspond to a preset target frequency, so that the muffler body can perform noise reduction at the target frequency.

This invention discloses a planar waveguide speaker with controllable directivity, comprising a speaker body. The speaker body is characterized by having a waveguide horn containing at least one sound outlet cavity. The inner surface of the sound outlet cavity includes two opposing parabolic arc surfaces and two opposing planes. By eliminating excessive transmission paths, sound pressure loss is reduced. Simultaneously, by modifying a portion of the waveguide horn's internal shape to a parabolic shape, the waveguide horn can generate cylindrical waves, improving harmful sound interference within the horn and between horns, and avoiding comb filtering in the audience's listening area.