486 results about "Wind noise" patented technology

A system for breakage early warning of high-voltage transmission lines based on acoustic prints, including a data acquisition unit, an edge processing unit, a cloud server, a warning execution unit, and a communication unit. The data acquisition unit is configured to collect environmental information of a high-voltage transmission tower in real time through a multimodal sensing device. The edge processing unit includes an adaptive filtering module configured to eliminate wind noise interference in the environmental information and compensate for frequency response deviation. The cloud server can generate a warning instruction based on the environmental information. The warning execution unit can perform warning and alarming actions based on the warning instruction. The communication unit is configured to enable data and information transmission among the units. A method implemented by such system is also provided.

The invention discloses a fan blade diagnosis method and system based on voiceprint perception, and relates to the technical field of intelligent monitoring of wind power equipment, and the method comprises the steps: carrying out frequency domain compensation processing, stripping environment wind noise components, and generating a pure voiceprint signal based on a wind flow characteristic parameter set; based on the pure voiceprint signal, identifying a sensitive acoustic frequency band of the fan blade, exciting a sound wave phase synergistic effect in the sensitive acoustic frequency band, and generating an enhanced voiceprint signal; quantifying the internal damage depth of the fan blade material according to the enhanced voiceprint signal, and calculating a sound energy flow disorder degree index; according to the sound energy flow disorder degree index, the blade health state of the fan is judged through a multi-dimensional acoustic characteristic state space mapping mechanism, and a three-dimensional health assessment report is generated; through a physical level wind noise stripping technology, a transfer function matrix is generated based on vortex interference modeling and sound wave-airflow phase offset correction, frequency domain energy reweighted decoupling is realized, and environmental wind noise is accurately stripped in a strong turbulence environment.

The invention relates to the technical field of voice recognition control, and discloses a voice recognition control method and system for an electric two-wheeled vehicle, and the method comprises the steps: carrying out the synchronous data collection of a three-axis wind sensor, a vehicle speed sensor, a six-axis attitude sensor and a stereo microphone array of the electric two-wheeled vehicle, obtaining a multi-source data set and an original voice signal; performing coordinate system conversion and vehicle body aerodynamic calculation on the multi-source data set to obtain a wind field intensity distribution matrix; performing asymmetric differential compensation on the original voice signal based on the wind field intensity distribution matrix to obtain a compensated voice signal; and performing dynamic wind noise suppression processing and voice recognition on the compensated voice signal to generate a target voice recognition result, thereby ensuring the voice recognition reliability under different wind direction interference intensities, and effectively improving the recognition precision and the response speed.

A vehicle comprising having a vehicle body including a lower side, a rear quarter window and a rear spoiler garnish, the vehicle defining an inner passenger compartment; a D-pillar garnish configured to be mounted on the vehicle body between the rear spoiler garnish and the lower side of the vehicle, the D-pillar garnish including an outer garnish body having a first predetermined curvature portion; and an inner garnish body. The rear spoiler garnish includes an outer rear spoiler garnish and an inner rear spoiler garnish, the inner rear spoiler garnish having a second predetermined curvature portion. A gap is defined between a rear edge of the outer garnish body and a lower edge of the rear spoiler garnish, and the first predetermined curvature portion and the second predetermined curvature portion defining a convoluted flow path through the gap.

The invention discloses a high-voltage transmission line breakage prevention early warning system and method based on voiceprint recognition, and the system comprises a data collection unit which can collect the environment information around a high-voltage transmission tower in real time; the edge processing unit is used for eliminating wind noise interference generated when the multi-mode sensing device collects environment information, compensating frequency response deviation and extracting voiceprint MFCC features and low frequency spectrum energy entropy of vibration signals; the cloud server is used for generating an early warning instruction according to the environment information processed by the edge processing unit; and the early warning execution unit is used for carrying out early warning and expelling according to the early warning instruction. According to the invention, the environment information around the high-voltage tower is acquired in real time through the data acquisition unit, and the edge processing unit and the cloud server are arranged to carry out rapid collaborative analysis and judgment on the acquired voiceprint signals, so that real-time monitoring on the periphery of the high-voltage tower is ensured, and timely early warning and expelling on surrounding vehicles are realized.

The invention discloses an offshore wind plant fan bolt loosening early warning method and system based on voiceprint data, and the method comprises the steps: firstly, collecting original voiceprint data through presetting an anti-corrosion acoustic sensor array at a fan tower bolt connection part, removing wind noise and sea wave impact noise through preprocessing, extracting signal spectrum features after cutting, and carrying out the recognition of the original voiceprint data; and state feature extraction and feature extension are respectively carried out to obtain fault state features and voiceprint high-dimensional features, so that the looseness reason and state of a target bolt are identified, and finally, a maintenance work order is generated to trigger a bolt fastening early warning mechanism of an operation and maintenance system, so that effective early warning of the looseness of the fan bolt of the offshore wind plant is realized.

The invention relates to the technical field of optical fiber sensing, in particular to a distributed optical vibration sensing early warning verification method for an island multi-source environment. Signals collected in different environments and different states are preliminarily divided into threat signals and non-threat signals, the effectiveness of data is further verified through frequency spectrum transformation, low-frequency noise and natural environment interference signals such as sea waves and wind sound are filtered out from the signals through a 5Hz high-pass filter, high-frequency noise is further suppressed by applying a wavelet denoising technology, and the non-threat signals are obtained. And useful signal features are reserved. A variational mode decomposition technology is adopted to carry out multi-scale decomposition on signals, and multiple classic features of a mode function obtained after decomposition are selected to extract feature vectors. Low-frequency effective signals are extracted, and high-frequency noise is removed, so that essential characteristics of the signals can be better captured. And the data subjected to signal processing is input into a CNN-LSTM-Attention model for deep learning analysis.

The invention discloses a wind noise prevention and shock absorption special glass composite structure and a manufacturing process, and the wind noise prevention and shock absorption special glass composite structure comprises two outermost tempered glass bodies, a plurality of grooves, a honeycomb-shaped inner sandwich, a shape memory alloy frame body I and a shape memory alloy frame body II, first clamping cavities are formed between the first shape memory alloy frame body and the buffering parts and between the second shape memory alloy frame body and the buffering parts, second clamping cavities are formed between the two buffering parts and the adjacent reinforcing bodies, and third clamping cavities are formed between the two reinforcing bodies and the adjacent laminated glass layers; various materials and structures of the outermost tempered glass body, the laminated glass layer, the buffer part, the reinforcing body, the honeycomb inner sandwich and the shape memory alloy frame body are compounded to form a multi-layer synergistic wind noise prevention and shock absorption system, and the wind noise prevention and shock absorption performance is remarkably improved due to the special shapes and distribution of the second clamping cavity, the third clamping cavity, the through concave body and the elastic pressing body.

The invention relates to the technical field of noise control, and discloses a vehicle chassis wind noise optimization method and device, computer equipment, a medium and a product, and the method comprises the steps: carrying out the dynamic mode decomposition of obtained flow field data, obtaining the flow field mode characteristics under different frequencies, screening out the low-frequency mode characteristics of middle and low frequencies, and carrying out the optimization of the low-frequency mode characteristics; therefore, the space-time evolution characteristics of the low and medium frequency wind noise in the vehicle chassis flow field can be accurately analyzed. Furthermore, the flow-induced load characteristic and the sound-induced load characteristic in each low-frequency modal characteristic are decoupled to obtain the sound-induced load characteristic in each low-frequency modal characteristic, so that the influence of airflow fluctuation, structural vibration and the like caused by the flow-induced load on the wind noise analysis is avoided; therefore, the positioning accuracy of the sound source and the propagation path of the wind noise waves is improved. And finally, in combination with the sound source and the propagation path of the wind noise wave, the low and medium frequency wind noise of the vehicle chassis is optimized, and the user experience is improved.

The utility model provides an outdoor unit and an air conditioner, and relates to the field of air conditioners. The outdoor unit comprises a machine shell and a fan arranged in the machine shell, the machine shell comprises a front panel, the front panel comprises a panel part, a flow guide ring part and an air outlet mesh enclosure part, the panel part, the flow guide ring part and the air outlet mesh enclosure part are integrally arranged, the flow guide ring part protrudes out of the panel part, and the air outlet mesh enclosure part is arranged at the air outlet end of the flow guide ring part; a hub is coaxially and fixedly arranged on an output shaft of the fan, fan blades are fixedly installed on the hub, the tail wing end of each fan blade is arranged in the flow guide ring part, and the ratio of the distance X between the tail wing end and the panel part to the length H of the flow guide ring part is 0.31-0.89, or the ratio of the distance X between the tail wing end and the panel part to the distance E between the tail wing end and the air outlet mesh enclosure part is 0.85-2.38. According to the outdoor unit, the air outlet amount of the outdoor unit is increased, and then the gas flowing efficiency and the heat exchange efficiency of the outdoor unit are improved. In addition, if the air volume is not changed, the air speed of the outdoor unit can be properly reduced, and therefore the air noise can be reduced.

The utility model relates to an active noise reduction system installation structure of a lampblack suction device and a range hood, an active noise reduction system comprises a sound collection device, the sound collection device is arranged in an air duct of the lampblack suction device, and the air duct is provided with a first side wall, a second side wall and an airflow inlet, the first direction is perpendicular to the extending direction of the air channel, the airflow inlet is arranged adjacent to the first side wall, at least one sound collecting device is arranged adjacent to the second side wall, the distance between the first side wall and the second side wall of the air channel is a, the distance between the sound collecting device and the second side wall is recorded as L1, and L1 and a meet the relation that L1 / a is larger than 0 and smaller than 0.3. The sound collection device is arranged on the side, away from the airflow inlet, in the air duct, so that the adverse effect of secondary noise (wind noise) generated when the sound collection device is directly impacted by airflow on sound collection can be better reduced, and the sound collection accuracy is improved.

The invention relates to the technical field of audio signal processing, and discloses a wind-noise-resistant self-adaptive volume adjustment method and system for a riding earphone, and the method comprises the following steps: S1, collecting environment sound and a source audio signal in parallel; s2, analyzing environment sound, and determining macroscopic adjustment intensity; s3, analyzing the source audio in parallel, and identifying a content type and a transient signal of the source audio; s4, based on the psychological acoustic model, generating a frequency-related target method tone quality compensation gain; s5, performing dynamic smoothing and frequency weighting on the target gain according to the content and the transient characteristics to generate an application gain; s6, fusing the macroscopic adjustment intensity and the application gain, and synthesizing a final gain parameter; and S7, applying the final gain to the source audio, and outputting the compensated audio. According to the method, the psychological acoustic model and audio content parallel analysis are fused, frequency-level accurate compensation is realized, the problems of traditional degradation and sudden hearing sense change are solved, and the audio definition and comfort are improved.

The utility model provides an inclined chip heat radiation fan box and an equipment heat radiation structure, the heat radiation fan box comprises a fan box housing, the lower end of the fan box housing is fixed on a base plate, and the central axis of the fan box housing and the base plate are arranged in an included angle. A cooling fan is fixedly arranged on the inner wall of the upper end of the fan box shell. A chip is arranged on the bottom plate and located in the fan box shell, and the chip and the air outlet direction of the cooling fan are correspondingly arranged in an included angle mode. The cooling fan comprises a fan shell, and a motor support used for fixedly arranging a motor is fixedly arranged on the inner wall of the fan shell. A rotating shaft of the motor is fixedly connected with an impeller for air supply through a locking nut. The heat dissipation fan box structure is obliquely arranged relative to the chip, flowing of heat dissipation airflow is facilitated, airflow accumulation disorder is avoided, the heat exchange effect is improved, heat dissipation is conducted quickly, and wind noise can be reduced. In addition, the cooling fan box and the equipment shell are simple in structure and convenient to install, the service life of equipment cooling is long, and the cost of the overall cooling structure is low.

The invention relates to the technical field of automobile manufacturing, and discloses a front wall outer plate assembly which is characterized in that a plate body and flow guide covering parts on the two sides are manufactured through an integrated forming process, a traditional multi-part splicing mode is replaced, the number of parts is reduced, the production cost is reduced, meanwhile, the assembly tolerance accumulation risk is reduced, and the attractiveness is improved; secondly, a through hole is formed in the bottom of the mounting groove in a penetrating mode, the bottom of the mounting groove can make contact with the vehicle logo, the contact area is increased, the mounting stability is improved, meanwhile, the closed cavity is broken through the through hole, and the situation that the vehicle logo is difficult to detach due to the negative pressure adsorption effect is avoided; and finally, the flow guide part is connected to the flow guide covering part, the blades can divide the opening into a plurality of air inlets, layered design is achieved, airflow is divided into ordered airflow, wind noise generated by vortexes is reduced, the ventilation effect is improved, wind resistance is remarkably reduced, the flow guide covering part and the flow guide part are detachably connected, replacement of accessories at different flow guide angles is supported, and cost is reduced. And the method has relatively high applicability.

The utility model discloses an earphone and playing equipment, and belongs to the technical field of earphones. The earphone comprises an earphone body and a shell, the earphone body is used for playing audio for the conchae cavity, the shell is connected with the earphone body, the shell is provided with a pickup hole, the pickup hole is used for picking up sound, the shell is provided with a pressure reduction area, the pressure reduction area is used for dispersing wind power of airflow, the pickup hole is formed in the pressure reduction area, and the opening direction of the pickup hole and the axial direction of the shell are arranged in a crossed mode. The earphone can reduce wind noise.

This invention provides a method and system for adjusting a vehicle audio system, which includes multiple speakers. The adjustment method includes: acquiring vehicle status information and the initial volume of each speaker, wherein the vehicle status information includes window opening status information, which includes window opening area information and window opening position information; determining the compensation volume of each speaker based on the vehicle status information; determining the target volume of each speaker based on the compensation volume and the initial volume; and adjusting the volume of each speaker based on the target volume. This method achieves targeted adjustment of each speaker based on the combined window opening area and position, avoiding the impact of wind noise generated after the windows are opened on the speaker volume, and effectively improving the passenger's auditory experience.

The invention provides a feed-forward type wireless noise reduction earphone structure and a wireless Bluetooth earphone. The feed-forward type wireless noise reduction earphone structure comprises an earphone shell module and a noise reduction processing module. The earphone shell module is composed of a noise reduction turbulent flow assembly, an in-ear shell, an L-shaped shell and an upper cover shell, the upper cover shell covers the L-shaped shell, the in-ear shell abuts against the L-shaped shell, and the L-shaped shell is provided with a device containing cavity used for fixing the noise reduction processing module. The top end of the L-shaped shell is provided with a pickup channel, a sound transmission cavity and a turbulent flow cavity, the turbulent flow cavity is communicated with the pickup channel, the pickup channel is communicated with the vertical sound transmission cavity, the noise reduction turbulent flow assembly covers the turbulent flow cavity, and an opening of the sound transmission cavity faces the microphone assembly of the noise reduction processing module. When the earphone is normally worn, the opening of the pickup channel faces the outer side of the human body helix, the main flow direction of external airflow can be avoided, and wind noise interference is reduced. The problem that a large amount of noise is mixed into sound signals due to the fact that a traditional earphone pickup hole is prone to being affected by wind noise is solved, and the microphone assembly can collect purer sound signals.

The utility model belongs to the technical field of clean rooms, and discloses a dust-free workshop air return device which comprises a connecting pipe opening, one side of the connecting pipe opening is connected with an air return pipeline in a sealed mode, the end, away from the connecting pipe opening, of the air return pipeline is connected with an air return pump in a sealed mode, and the output end of the air return pump is connected with an S-shaped noise reduction pipeline. An S-shaped noise reduction pipeline is arranged in the air return pump machine, noise reduction cotton is arranged in the S-shaped noise reduction pipeline, the end, away from the air return pump machine, of the S-shaped noise reduction pipeline is connected with an air return filtering device in a sealed mode, and the output end of the air return filtering device is connected with an air outlet pipeline. According to the air conditioner, the structural design is compact and reasonable, the return air is not directly mixed with outside fresh air, the return air is not subjected to temperature and humidity treatment, energy can be greatly saved, certain economic benefits are achieved, wind noise can be reduced, and the situation that the filtering effect is affected due to the fact that the wind speed is too high can be avoided.

The application discloses a water-cooled controller for a pump and belongs to the field of water pump controllers. In view of the problems of poor heat dissipation and loud noise of an air-cooled controller, the water-cooled controller comprises a shell and an upper cover which are connected together, a circuit board is arranged between the shell and the upper cover, a partition wall is arranged in the shell, the circuit board is connected to the partition wall from top to bottom, a cooling pipe capable of communicating with a water source penetrates through the shell, the cooling pipe is connected to the partition wall from bottom to top through a connecting assembly, a heating element is arranged on the circuit board, the heating element is tightly attached to the partition wall, or the heating element corresponds to the upper and lower positions of the cooling pipe, so that the heat generated by the heating element is directly or indirectly transferred to the cooling pipe. The heat of the heating element on the circuit board is directly or indirectly transferred to the cooling pipe, the water flow in the cooling pipe can take away the heat transferred thereto, the heat dissipation effect is guaranteed, and no fan is used, so that the influence of wind noise is effectively avoided.

This utility model relates to the field of helmet technology, specifically to a helmet with a concealed lens, comprising an outer shell, an inner liner disposed inside the outer shell, and a lens hinged to the inner shell and located outside the inner liner; a storage cavity is formed between the outer shell and the inner liner to house the lens, thus concealing the lens inside the helmet. This utility model, through its concealed lens design, significantly improves helmet durability, reduces wind resistance and wind noise, optimizes the aesthetics, and reduces the frequency of cleaning and maintenance.

The invention discloses an open type wearable noise reduction earphone, and relates to the field of earphones. The earphone shell is provided with a pickup hole; the pickup hole is positioned on the inner side of the earphone shell; the microphone is arranged in the earphone shell and corresponds to the pickup hole; the noise reduction net-shaped structure is connected with the earphone shell and shields the pickup hole; and the noise reduction net structure is positioned on one side, close to the pickup hole, of the microphone. According to the microphone, the pickup hole is shielded by the noise reduction net structure, voice sound waves are allowed to pass through, the sensitivity of the microphone to effective voice signals is not remarkably reduced, and tone quality degradation or algorithm compensation requirement increase caused by blockage of a pickup channel is avoided; and the direct impact of wind noise on the microphone is avoided, physical weakening and energy dissipation are carried out on the airflow entering the pickup channel, and the influence of the wind noise on the pickup of the microphone is reduced from the structural level, so that the call quality in a wind noise scene is effectively improved on the premise of not influencing the open wearing experience.

This invention discloses a pop-up windshield wiper device and its operating method for reducing wind noise. It includes a wiper drive motor fixed to the front spoiler panel, with the wiper drive motor's drive end connected to the wiper blade. It also includes a cover box fixed below the hood, with the rear of the cover box located above the wiper drive motor. A seal is fixed between the front of the front spoiler panel and the bottom of the cover box to fill the gap and prevent rainwater from entering the engine compartment. A cover plate is provided inside the cover box, which can extend out to fill the gap between the bottom of the windshield and the hood, or retract into the cover box. When the cover plate extends, the wiper blade can retract into the space enclosed by the front spoiler panel, the cover box, the cover plate, and the windshield. When the wiper is working, the cover plate retracts into the cover box, providing unobstructed movement space for the wiper. When the wiper is not working, the cover plate extends to fill the gap between the bottom of the windshield and the hood, significantly reducing wind noise.

To provide a fitting structure for an imaging device capable of suppressing the generation of wind noise caused by traveling wind.SOLUTION: A fitting structure 10 for an imaging device comprises an imaging device 12 mounted on a roof 2 of a vehicle 1, and a housing 13 that accommodates at least a part of the imaging device. The imaging device has a lens 15 oriented toward the front side and left and right outward sides of the vehicle. The housing includes a peripheral wall part 21 disposed on the outer periphery of the lens. The peripheral wall part has, in plan view, a front wall portion 29 disposed in front of an optical axis A of the lens, and in plan view, a rear wall portion 30 disposed behind the optical axis of the lens. When a direction parallel to the optical axis of the lens and extending toward the front side and left and right outward sides of the vehicle is defined as an outward direction, and the tip side in the outward direction is defined as the outer side, in plan view, an end 29A on the outer side of the front wall portion is positioned on the outer side relative to an end 30A on the outer side of the rear wall portion.SELECTED DRAWING: Figure 5

The invention relates to the technical field of artificial intelligence, and discloses a BCM module cooperative control method based on voice instruction recognition in a vehicle-mounted high-noise environment, and the method comprises the following steps: collecting original voice instruction data and vehicle state parameter data in the vehicle-mounted high-noise environment; performing voice signal preprocessing in a noise environment based on the original voice instruction data to generate de-noised voice instruction data; according to the method, the engine noise and the wind noise steady-state background noise are filtered out through multi-level noise suppression processing combining adaptive filtering and spectral subtraction, residual noise elimination is carried out for sudden impact noise, and the definition of voice signals is improved. Meanwhile, through a voice activity detection algorithm, a detection threshold is dynamically adjusted according to vehicle state parameters, an effective voice segment and a noise segment can be separated, the accuracy of voice feature extraction in a complex time-varying noise environment is ensured, and thus the robustness and reliability of voice instruction recognition are improved.

A combined convolutional neural network driven automobile flow field excitation prediction method comprises the following steps: 1) constructing a plurality of automobile deformation models with continuous geometric feature changes, and sampling multi-view images of all automobile deformation models to construct an image dataset; 2) simulating transient flow fields of all automobile deformation models, obtaining corresponding fluid dynamic pressure excitation and sound pressure excitation, and labeling corresponding multi-view images in the image dataset with excitation labels to construct a training set; 3) constructing a combined convolutional neural network model; 4) taking multi-view images as input and excitation labels as output, and training the combined convolutional neural network model by using the training set; and 5) obtaining multi-view images of a to-be-predicted automobile, inputting the multi-view images of the to-be-predicted automobile into the trained combined convolutional neural network model, and obtaining predicted fluid dynamic pressure excitation and sound pressure excitation. The application can significantly reduce the dependence of automobile flow field excitation calculation on supercomputing services and reduce wind noise development costs.

The utility model discloses a geological disaster early warning with mechanical structure infrasound sensing monitoring device belongs to geological disaster monitoring technical field. The technical problem to be solved is that the existing infrasound sensing monitoring device is easy to be interfered by wind noise caused by strong wind direct blowing, and sandstone and dust are easy to block after entering and cannot be cleaned automatically. Technical scheme main points: including pillar, the fixed hoop equipment box is equipped on the outer wall of pillar, and the mounting plate is fixedly arranged in the equipment box, and the telemetry terminal and the infrasound sensor are arranged on the mounting plate; A plurality of blow-off plates are provided in the equipment box along the height, the blow-off plate comprises a W wave plate and a base, the W wave plate is provided with a through hole at the bottom end and is arranged on the inner wall of the equipment box, and the base is matched with the through hole; The collecting disc is fixedly arranged in the equipment box and located below the blow-off plate. The device forms a bending channel through the blow-off plate to avoid the direct blowing of the sensor, cooperates with the base to intercept sandstone, and realizes the automatic cleaning of sandstone through the linkage of the rotating plate and the base. L-shaped drain pipe guides sandstone to be discharged and prevents rainwater from flowing back, and is mainly used for early warning of geological disasters.

The utility model relates to the field of ventilation equipment, in particular to an anti-blocking mute floor blowing fan which comprises a shell. The device further comprises a buckle ring and a target-shaped sound absorption frame with holes, the inner walls of the left end and the right end of the shell are fixedly connected with a wind generating chamber in a penetrating mode, a power piece containing groove is formed in the right end of the integrated structure formed by the shell and the wind generating chamber, power assemblies are arranged in the power piece containing groove and the wind generating chamber, and a discharging opening is formed in the front end of the wind generating chamber in a penetrating mode. The shielding dustproof net is installed on the inner wall of the fixing ring, external floating objects are intercepted in the working process, the dustproof protection effect is achieved, one end of the tough elastic piece penetrates through the through hole of the fixing ring to extend to the left end, the clamping ring can be deformed and pulled out through pressing in the maintenance process, rapid disassembly is achieved, and related parts are convenient to clean; and the annular sound-absorbing cotton is fixedly connected to the arc-shaped outer wall of the outermost side of the target-shaped sound-absorbing frame with the holes, so that the effects of vibration resistance and noise reduction are achieved, and the resonance noise of the shell is reduced.

The utility model discloses a noise reduction air receiving port, which comprises a square frame, an outer plate, a shell, an air inlet, an air inlet pipeline, an air outlet joint, an inner plate and an air outlet, the outer plate is arranged above the square frame, the shell is arranged on the outer plate, the air inlet is arranged on the shell, one side of the shell is connected with the air inlet pipeline, and the other side of the shell is connected with the air outlet joint. One end of the air inlet pipeline is communicated with the air inlet in the shell, and the other end of the air inlet pipeline is communicated with an air outlet connector. An inner plate is installed below the square frame, an air outlet is formed in the inner plate and communicated with the air outlet end of the air outlet connector, the shell is of a square structure with an opening in the top, an air inlet is formed in the side wall of the shell, the air inlet pipeline is a porous noise reduction air channel, the air outlet connector is composed of two air channel connectors, and the air inlet connector is connected with the air inlet pipeline. According to the utility model, wind noise and external sound can be reduced, so that the sound insulation effect of the cabin body is improved, and wind circulation is kept.

The present application relates to epidemic prevention communication technology field, especially to a duplex cluster communication interaction method and system and epidemic prevention helmet, which comprises: using the air guide pickup component arranged in the helmet body to obtain the voice signal of the wearer, and outputting the audio signal through the air guide sound production component arranged in the helmet body; performing echo cancellation and noise reduction processing on the obtained audio signal; using an adaptive filtering algorithm to suppress the acoustic feedback between the air guide pickup component and the air guide sound production component; based on a distributed channel access mechanism, allocating communication resources for multiple communication nodes to access in duplex; relying on a mesh self-organizing network topology without a central node to perform multi-hop forwarding and route maintenance of data packets, solving the problems of unclear communication, howling and signal attenuation in the strong noise, wind noise and shielding scene in the epidemic prevention helmet, effectively guaranteeing the clarity, stability and safety of cluster communication in harsh working environment.

The invention provides audio automatic detection equipment, and relates to the technical field of audio detection. The audio automatic detection equipment comprises a to-be-tested sound source assembly, and further comprises an air nozzle configured to provide air flow required by a wind noise test for the sound source assembly, and the air nozzle is in fluid communication with a pump set through an air guide pipeline; the artificial ear assembly is correspondingly arranged under the wind nozzle, a main body of the artificial ear assembly is a tubular outer shell, a limiting bayonet is formed in the top end of the outer shell and used for fixing the sound source assembly to be detected, and an audio detection piece is arranged in the bottom end of the outer shell to collect acoustic signals of the sound source assembly in the wind noise environment. According to the invention, a fitting degree quantification structure of deformation of the elastic soft film is matched with an airflow channel switching structure driven by the reversing plug, a test condition close to a real use scene is constructed, the structure can accurately reproduce actual working conditions of earphone wearing loosening and airflow interference, a multi-factor coupling test of ANC intervention and airflow injection under a fitting gap is realized, and the test efficiency is improved. And the influence degree of the airflow on the ANC noise reduction effect and the tone quality is quantified.