402 results about "Noise generation" patented technology

The invention provides a building LOD2 model diffusion generation method and system based on multi-modal feature constraints, and belongs to the field of remote sensing image processing. According to the method, a three-dimensional polygon noise generation module MM2P-Init and a multi-modal feature constraint module MM2D-Control are mainly utilized to construct a diffusion model MMP-DiffNet, a noise reduction generation process from three-dimensional polygon noise to a building roof structure is realized, the influence of extraction precision of low-dimensional features such as points and lines on a building LOD2 model topology reconstruction process is reduced, and the construction efficiency is improved. And the precision of building LOD2 model construction by the satellite image is improved.

The invention relates to a wind noise modeling method and system based on machine learning and application, and belongs to the field of marine acoustics and environmental noise modeling, and the method comprises the steps of data preprocessing and feature extraction, hybrid network model building, hybrid network model training and verification. According to the method, a hybrid network model of multiple linear regression and a multi-layer perceptron is constructed based on a known physical mechanism of wind noise and two main noise generation mechanisms of surface turbulence and bubble oscillation, a linear relation and a non-linear relation are modeled respectively, outputs of the two models are integrated through a weighted fusion strategy, and a multi-layer perceptron model is constructed. Smooth transition modeling from a low-wind-speed linear relation to a high-wind-speed nonlinear relation is achieved.

The invention discloses an anisotropic noise generation method based on local tensor integral field feature modulation, and is applied to the technical field of computer texture generation. The method comprises the following steps: step 1, constructing a global tensor field of spatial anisotropy intensity and direction; step 2, calculating local tensor integral features in a support domain based on the support domain of a Gabor noise kernel function, the local tensor integral features including principal direction features and anisotropic ratio features; step 3, calculating a curvature penalty factor based on the deviation between the local tensor integral feature and the center tensor of the seed point; step 4, based on the local tensor integral features, performing weighted correction on the frequency domain center frequency and Gaussian envelope parameters of the Gabor kernel function; and step 5, generating a final noise texture based on the corrected kernel function. The Gabor kernel function parameter is subjected to weighted correction through the local tensor integral feature and the curvature penalty factor, modulation of the kernel function direction under the high-curvature tensor field is achieved, spectrum leakage, texture fracture and artifacts caused by inconsistent direction changes in the kernel function can be reduced, and the robustness of the kernel function is improved. Therefore, the topological continuity and the simulation fidelity of the anisotropic noise texture at the complex structure are improved.

A door lock for a vehicle includes a rotary latch for form-fittingly holding a locking element, a blocking mechanism for blocking the rotary latch from releasing, and a wedge system having a wedge lever and a connection piece, which can be brought into a self-locking contact position in order to reduce a relative movement between the locking element and the rotary latch. The blocking mechanism contacts a circumference of an output lever via a circular-arc-shaped circumferential segment so that, when the blocking mechanism moves, the output lever is rotated by rolling on the circumferential segment. The output lever is coupled with a driving lever so that the rotation of the output lever during the opening movement of the blocking mechanism causes the driving lever to release the self-locking connection between the wedge lever and the connection piece.

The invention discloses a sound insulation and noise reduction water supply and drainage pipeline, and belongs to the technical field of water supply and drainage pipelines, the sound insulation and noise reduction water supply and drainage pipeline comprises a pipeline body and a connecting mechanism, the pipeline body comprises an outer pipe body, an inner pipe body, a supporting ring and a sealing ring, and an exhaust mechanism is arranged at the top of the outer pipe body and comprises an exhaust pipe, a sealing cover and a one-way valve; the two ends of the outer side of the outer pipe body are fixedly sleeved with fixing rings. The connecting mechanism comprises a front connecting base, a rear connecting base, a connecting frame, a fixing frame and a plug pin. The interlayer space between the inner pipe body and the outer pipe body is vacuumized and reliably sealed, the transmission path of sound in the structure is effectively cut off, outward transmission of noise generated by water flow in the pipe and vibration of the pipe is remarkably blocked in the vacuum state, and the overall sound insulation performance is greatly improved; the core measure is supplemented with the design of the supporting ring and the elastic sealing ring, vibration buffering is provided at a key connecting point, energy is absorbed and dissipated, and excellent environmental noise control is comprehensively achieved.

The invention relates to a monitoring and early warning system for preventing teenager myopia, which captures teenager eye using behavior characteristics in real time in a dynamic environment and accurately recognizes an abnormal state through cooperative work of multiple modules, and eliminates space-time dislocation interference among equipment by using three-dimensional topology modeling, so that the system can be used for preventing teenager myopia. The double-frequency attention mechanism effectively separates eye physiological signals and environmental noise, the electromagnetic constraint noise generation technology restores a real interference scene, the gradient coupling mechanism continuously optimizes the equipment relation network, finally high-precision eye use behavior recognition is achieved, early warning is conducted on myopia inducements such as short-distance eye use overtime and illumination discomfort, and the myopia identification accuracy is improved. Through a personalized intervention scheme, the false alarm rate is remarkably reduced, the user compliance is improved, the myopia development speed of teenagers is effectively delayed, and a'monitoring-early warning-intervention 'closed-loop prevention and control system is formed.

The invention provides a privacy protection noise generation method based on black box adversarial samples, and relates to the technical field of noise generation. Comprising the steps of constructing a voice data set; randomly generating initial white noise data; superposing the initial white noise data and target voice in the voice data set to obtain a superposed voice data set; performing data amplification on the superposed voice data set to obtain an amplified data set; inputting the amplified data set into a local white-box speech recognition model to obtain final white noise data; performing noise amplification on the final white noise data, and superposing the final white noise data with the voice data set to obtain a multi-intensity noise-added voice data set; and performing fine tuning training on the local white box model by using the multi-intensity noise-added voice data set to obtain a final noise generation model so as to generate final privacy protection noise. The technical problem that interference noise cannot be optimized based on an adversarial sample technology when the black box model parameters and architecture cannot be obtained and only the final recognition result can be obtained in the prior art is solved.

This utility model belongs to the technical field of sewage treatment equipment, and provides an open channel ultraviolet disinfection device, including a mounting plate, a disinfection box, a cleaning frame, brushes, connecting ropes, and a drive mechanism. The mounting plate has multiple vertically penetrating and parallel strip-shaped mounting holes, and through holes are respectively opened at the four corners of the mounting plate. The lower end of the disinfection box passes through the corresponding strip-shaped mounting holes. The disinfection box contains multiple ultraviolet lamps. The cleaning frame is vertically movable and positioned below the mounting plate. The brushes are connected to the cleaning frame, and one end of the connecting rope passes through the corresponding through hole and connects to the cleaning frame. This utility model uses a drive mechanism to move the connecting ropes to achieve the lifting and lowering of the cleaning frame, thereby cleaning the lower end of the disinfection box. Because there are four connecting ropes, the cleaning frame is evenly stressed when the drive mechanism drives the connecting ropes, preventing the cleaning frame from tilting and ensuring stable lifting and lowering operation, thus reducing noise generation.

According to the shell module, the examination couch and the scanning equipment, the shell module comprises a shell assembly and a sliding rail assembly, the shell assembly comprises a plurality of shells, the multiple shells are sequentially arranged in a sleeving mode, and any two adjacent shells in the multiple shells are in sliding connection through the sliding rail assembly in the vertical direction. In other words, the shell assembly can guide the movement of the two adjacent shells in the vertical direction through the sliding rail assembly, so that the shell assembly can only move in the vertical direction. In this way, the situation that in the movement process of the whole shell module, due to the fact that the shell modules are subjected to external force, the shells between different layers rub against one another, noise, abnormal sounds or jamming are generated is avoided, and the use experience of the examining table with the shell module is improved.

The invention provides an indoor unit and an air conditioner. The indoor unit comprises a shell; the air port assembly is arranged at the air port, and the air port assembly is provided with an indoor communication port and a fan communication port; and the air guide plate is arranged in the air port assembly, and the air guide plate can guide air flow of the fan communication port to the indoor communication port. According to the indoor unit and the air conditioner, the air deflector in the air opening assembly is utilized, the air opening communicating opening of the air opening assembly communicates with the air outlet of the draught fan, so that air outlet airflow of the draught fan flows to the indoor communicating opening through the draught fan communicating opening, meanwhile, the air deflector can guide the part of air outlet airflow, and the air outlet airflow is more uniform. According to the indoor unit, turbulent flow is prevented from being generated in the air port assembly, the problem that noise is generated due to the turbulent flow in the prior art is effectively solved, it can be guaranteed that all the air outlet airflow can be smoothly fed into a room, and the working efficiency of the indoor unit is effectively improved.

The application provides a flow control method based on three-curved-surface fish scale bionic structure, comprising the following steps: S1, constructing a main structure of an impeller blade, including a suction surface e and a pressure surface f, and fish scale areas g with multiple fish scale bionic structure coupling elements arranged regularly are arranged on the suction surface e and the pressure surface f; S2, constructing and designing a single fish scale bionic structure coupling element, including a bottom surface adhering to a blade surface, a top surface in a fish scale structure, and a rear side cylindrical surface; the top surface comprises two groups of parallel fold surfaces, and each group of fold surfaces is composed of three quadrilateral surfaces; a space rectangular coordinate system is established with a front end point of the bottom surface as an origin, and the fish scale bionic structure coupling element is constructed in the space rectangular coordinate system; and S3, establishing multiple fish scale bionic structure arrangement rules. The application can improve the fluid flow characteristics of the blade surface and reduce noise generation based on the control of flow by bionic structure.

The invention discloses a joint active noise reduction device and an active noise reduction method, and relates to the technical field of active noise reduction, the joint active noise reduction device comprises a joint shell part, and the joint shell part is fixedly provided with a vibration monitoring module through strong glue or a strong magnetic block; a feedback adjusting module, an information processing and analyzing module and an active noise reduction executing module are arranged on a shell of the joint, and the output end of the vibration monitoring module and the output end of the feedback adjusting module are electrically connected with the input end of the information processing and analyzing module through shielding cables. The output end of the information processing and analysis module is electrically connected with the input end of the active noise reduction execution module through a shielding cable, the device is provided with the active noise reduction execution module and the vibration monitoring module to intervene vibration and noise of the joint, noise generation can be reduced from the source, and compared with a traditional passive noise reduction method, the noise reduction effect is remarkably improved.

Provided in the present application is an electronic expansion valve, comprising a valve tube, a valve seat portion, a nut structure, a valve needle structure and a hollow noise reduction column, wherein the valve seat portion is connected to one end of the valve tube, and the valve seat portion is provided with a valve port; at least part of the nut structure is located in the valve tube, and the nut structure is fixedly connected to the valve seat portion; the valve needle structure movably passes through the nut structure to open and close the electronic expansion valve and regulate the degree of opening of the valve port; one end of the noise reduction column is in limiting fit with the valve seat portion, the other end of the noise reduction column is in limiting fit with the nut structure, and the noise reduction column is arranged around the valve port and the valve needle structure. The nut structure is provided with a communicating channel; the communicating channel communicates cavities inside and outside the noise reduction column to discharge impurities in fluid that remain in the noise reduction column. When the fluid flows through the noise reduction column, the noise reduction column breaks down air bubbles in the fluid for noise reduction. The communicating channel enables impurities inside the noise reduction column to be discharged out of the noise reduction column. The present solution solves the problem of the generation of noise during use of the electronic expansion valve, and avoids impurity blockage.

The expansion valve comprises a valve body assembly, a switch piece and a silencing assembly, the valve body assembly is provided with a valve port, a first side and a second side, and the valve port is located between the first side and the second side and communicates with the first side and the second side; the switch piece and the noise reduction assembly are arranged on the first side and / or the second side, the noise reduction assembly is connected to the valve body assembly, a channel is formed between the noise reduction assembly and the valve body assembly, the noise reduction assembly is provided with a porous noise reduction part, the switch piece is movably located between the noise reduction assembly and the valve port, and a first flow channel is formed between the switch piece and the valve body assembly; when the flowing direction of the working medium is from the valve port to the silencing assembly, the porous silencing part is closed by the switch piece; and when the flowing direction of the working medium is from the silencing assembly to the valve port, the porous silencing part is opened. According to the expansion valve, the problems that a refrigerant flowing through the valve port is prone to cavitation to generate noise, and bubbles are prone to being generated in the refrigerant before flowing through the valve port to generate noise can be solved.

The utility model relates to the technical field of magnetic core processing, in particular to a material pushing mechanism for magnetic core processing. The magnetic core machining pushing mechanism comprises a base, a connecting frame, a conveying belt, fixing plates, guide rods, springs, a pushing plate and the like, the connecting frame is slidably connected into the base, the fixing plates distributed front and back are fixedly connected to the top of the connecting frame, the conveying belt is rotatably connected to the outer portion of the connecting frame, and the pushing plate is slidably placed between the two fixing plates. The right side of the push plate is fixedly connected with symmetrically-distributed guide rods, the fixing plate is in sliding connection with the transversely-aligned guide rods, the guide rods are sleeved with springs used for assisting resetting, and the two ends of the springs are connected with the fixing plate and the guide rods respectively. The conveying belt is arranged to place the magnetic core, the magnetic core is pushed into the positioning mechanism of the machining equipment, the magnetic core can be prevented from being directly contacted with the base to be abraded, the integrity of the surface of the magnetic core is protected, noise can be prevented, and noise pollution in the working environment is reduced.

The invention relates to a remote sensing image reverse editing method for a diffusion model, and belongs to the field of computer vision. The strong generation and editing capability of the diffusion model brings a series of potential safety hazards, and the image reverse editing technology aims at adding a layer of protective noise to an image, so that the diffusion model is difficult to output an ideal editing result. In order to solve the problems that an existing anti-editing technology is poor in effect on a remote sensing image and generally faces low efficiency and obvious protection traces, the invention provides an efficient and hidden protection scheme which comprises the following three steps: step 1, generating anti-editing disturbance based on hidden space high-frequency component suppression; step 2, noise generation network training based on single-time forward transmission; and step 3, concealment enhancement based on noise perception graph constraint. The method can effectively resist malicious image editing based on a diffusion model, is suitable for the field of remote sensing images, and gives consideration to safety, efficiency and image quality.

This invention provides a technology that reduces or cancels out the noise of massage devices using a different approach than conventional methods. [Solution] The massage device 100 comprises a sound signal output unit 21 and a speaker 3. The sound signal output unit 21 outputs an output sound signal that includes a suppression sound signal that weakens or cancels out noise generated from the device 100. The speaker 3 converts the output sound signal into sound and outputs the sound. The sound signal output unit 21 has a sound selection unit 211. Based on the noise generation conditions, the sound selection unit 211 selects a suppression sound signal from among a plurality of recorded sound signals pre-recorded as sound information 11 stored in the storage unit 1,902.

The application discloses a kind of class imbalance table data processing methods based on contrast constraint diffusion generation, belong to data processing technical field, it includes using binary classification table dataset to generate model training, obtain the generation model based on noise generation minority class's synthetic latent representation, generate model is randomly generated with several noise inputs, diffusion modeling branch is denoised to each noise and obtains the synthetic latent representation of minority class of each noise, using decoding module is decoded to each synthetic latent representation, obtains synthetic table sample;Data filtering is carried out to all synthetic table samples, then all synthetic table samples after filtering are merged with table dataset, and enhanced imbalance table data are obtained.The application introduces contrast learning branch in the process of generating minority class sample, effectively overcome the deficiency existing in class imbalance table data processing of existing oversampling method and general generation model.

The present invention discloses a traffic classification method and system based on smooth noise data enhancement. The method comprises the following steps: a noise generation module generates unified normalized noise and converts the normalized noise into characteristic noise; a noise optimization module optimizes the noise shape through a gradient-based algorithm and optimizes the noise scale through an improved Bayesian optimizer; a data enhancement module generates optimized smooth noise based on the optimized noise shape and noise scale, and adds the optimized smooth noise to benign and malicious samples, respectively, to obtain enhanced new samples; an integrated learning module uses the enhanced samples as pseudo-malicious samples to train a traffic classifier, collects the results of traffic classifiers trained under multiple sets of noise scales, and combines the classification results using an improved Boosting algorithm to obtain the final classification result. The method effectively optimizes the classification boundary of the traffic classifier, improves the recall rate of the traffic classifier for unknown types of malicious traffic, and enhances the generalization of the classification results.

The invention relates to a format part fastening for a container processing system, in particular a container filling system and / or a container cleaning system, and a corresponding container processing system. In order to enable particularly long-lasting and low-wear operation with minimal noise generation, as well as quick and easy replacement of the format part, the format part fastening comprises a double-threaded bolt for the frictional fastening of a format part, in particular a container guide part, relative to a machine frame ora further component of the container treatment system, wherein the double-threaded bolt has a first thread for interacting with a first threaded receptacle fixed directly or indirectly to the format part and a second thread for interacting with a second threaded receptacle fixed to the machine frame, and wherein the first thread and the second thread, forming a differential thread, have a different thread pitch for clamping the format part relative to the machine frame.

This disclosure provides a compressor that suppresses noise generation by suppressing variations in the gap between the muffler and the bearing, for bearings having discharge holes. [Solution] A rotary compressor comprising: a shaft extending in a first direction; a motor that drives the shaft; a first bearing that supports the shaft and has a discharge hole through which compressed refrigerant is discharged; a cylinder that forms a cylinder chamber inside; a roller fixed to the shaft and rotating eccentrically in the cylinder chamber; and a muffler arranged to cover the discharge hole, wherein the motor, the muffler, the first bearing, and the cylinder are arranged in order along the first direction; the first bearing has a boss portion that supports the shaft and protrudes toward the muffler; the muffler has an opening through which the boss portion passes; and the positioning structure determines the position of the muffler relative to the first bearing such that the first bearing or the muffler has a gap with the opening around the entire circumference in the outer direction of the boss portion.

The invention provides a loudspeaker control method and electronic equipment, the electronic equipment comprises a loudspeaker, the loudspeaker comprises a voice coil, a rigidity adjusting assembly and a displacement monitoring assembly are arranged in the loudspeaker, and the displacement monitoring assembly is used for monitoring the rigidity adjusting assembly when the rigidity adjusting assembly moves. The method comprises the steps that when the displacement of the rigidity adjusting assembly relative to the balance position exceeds a first interval range or the moving speed of the rigidity adjusting assembly changes suddenly, an input signal of the voice coil is changed, and the input signal of the voice coil is used for driving the voice coil and the rigidity adjusting assembly to move. By adopting the loudspeaker, the problems of distortion, noise generation, incapability of rebounding and the like caused by overlarge amplitude of the vibrating diaphragm can be solved, the loudspeaker can be prevented from losing efficacy, the maximum capability of the loudspeaker can be effectively exerted, and the stability of the loudspeaker under large amplitude can be improved.

The present application relates to the audio technical field, and especially to an electronic device and a middle frame. The electronic device comprises a middle frame, a display screen and a loudspeaker module, wherein the display screen is mounted on one side of the middle frame; a sound output channel is formed between the display screen and the middle frame; the middle frame is provided with a communication hole; the communication hole is in communication with the sound output channel; the loudspeaker module is mounted on the side of the middle frame that faces away from the display screen; and sound emitted from the loudspeaker module enters the sound output channel via the communication hole. The electronic device is provided with a clearance area and a flow guide portion, the flow guide portion being located between the communication hole and the clearance area. The flow guide portion for flow guiding is provided, and guides air in the sound output channel, such that the maximum flow rate of the air in the sound output channel is reduced, thereby reducing noise generation, and facilitating an improvement in the audio quality of the electronic device, without affecting the other structures of the electronic device, i.e., the miniaturization design of the electronic device is facilitated, such that the user experience is improved.

The invention discloses an analysis and prediction method for high-frequency noise of a pod propeller, and the method comprises the following steps: S1, obtaining flow field original data and corresponding high-frequency noise monitoring data of the pod propeller in a working state, and carrying out the preprocessing; and S2, constructing a flow field-noise coupling analysis framework based on the separation vortex model, and setting a time step length and a calculation frequency matched with actual working conditions. The invention relates to the technical field of ship propeller noise analysis and prediction. According to the pod propulsor high-frequency noise analysis and prediction method, flow field vortex structure characteristics can be captured by constructing a flow field-noise coupling analysis framework and processing the preprocessed flow field data, and the contribution degree of each vortex unit to the high-frequency noise is accurately calculated based on a vortex structure and noise generation correlation mechanism, so that the high-frequency noise analysis and prediction method is provided for the high-frequency noise analysis and prediction of the pod propulsor. The vortex units leading the noise source are screened, dynamic positioning of the high-frequency noise source is achieved by combining the space-time position information of the vortex units, and the source of noise generation can be deeply known.

The invention relates to an EMC discrete noise compensation circuit, and the circuit comprises a noise generation module which is used for generating a square signal and a gain adjustment signal based on a discrete noise signal, and the square signal and the discrete noise signal are the same in frequency and are opposite in phase; the gain amplification module is used for generating a noise compensation signal which counteracts the discrete noise signal based on the square wave signal and the gain adjustment signal; and the signal coupling module is used for coupling the noise compensation signal to an EMC (Electro Magnetic Compatibility) port of the electronic equipment so as to offset the discrete noise signal. According to the method, a specific noise source is introduced innovatively, the effect of totally compensating and counteracting the excessive noise signal is achieved by coupling the inverted same frequency noise signal and the original noise signal, various complex combination attempts such as filtering, suppression, bypass, shielding and grounding of traditional measures are abandoned, and the method is simple, clear and easy to implement.

This invention discloses an air-cooled energy-saving distribution transformer, including a transformer housing and an air-cooling device and a heat dissipation device disposed on one side of the transformer housing. The transformer housing is equipped with a noise reduction mechanism. The air-cooling device includes a cooling fan, a cooling block, a cooling plate, and a first heat dissipation fan. The heat dissipation device includes a heat dissipation window, and a second heat dissipation fan and a dustproof mechanism are disposed outside the heat dissipation window. The noise reduction mechanism includes a first honeycomb sound insulation board, sound insulation felt, sound insulation cotton, and a second honeycomb sound insulation board. This invention achieves the purpose of reducing the air temperature inside the transformer housing by setting up the air-cooling device, thereby enhancing the heat dissipation effect of the main body of the distribution transformer. The heat dissipation device dissipates the high temperature inside the transformer housing while the dustproof net adsorbs dust inside the transformer housing. The noise reduction mechanism absorbs the noise generated by the main body of the distribution transformer, reducing noise and thus minimizing the impact on the daily lives of surrounding residents.

The invention relates to the field of air conditioners, particularly provides an air conditioning system and a control method thereof, and aims to solve the problem that noise is generated when modes of an existing multi-split air conditioner indoor unit are switched. In order to achieve the purpose, the air conditioning system comprises a first four-way valve, a low-pressure main path, a high-pressure main path and an indoor heat exchanger, the second side of the indoor heat exchanger is connected to the high-pressure main path through a high-pressure branch, and the second side of the indoor heat exchanger is connected to the low-pressure main path through a low-pressure branch; the high-pressure valve is arranged on the high-pressure branch; the low-pressure valve is arranged on the low-pressure branch; the control method comprises the following steps that according to the current mode of the air conditioning system, the current mode of a target indoor heat exchanger and a target mode, the working modes of a first four-way valve and a high-pressure valve and a low-pressure valve corresponding to the target indoor heat exchanger are determined; the pressure difference can be balanced, and noise during switching is reduced.

The utility model belongs to the technical field of rotor compressor, disclose a cylinder subassembly, compressor pump body, rotor compressor and air conditioner, including cylinder body, the cylinder wall of cylinder body is provided with the spring hole and the knife mark hole along the radial direction on slide vane groove, slide vane groove includes the first groove section and the second groove section that link in order; The starting point of first groove section is the inner wall of working chamber of cylinder body, and the endpoint of first groove section is the hole bottom tip portion of spring hole; The starting point of second groove section is the hole bottom tip portion of spring hole, and the endpoint of second groove section is the through part of slide vane groove and knife mark hole; The second groove section is wedge groove, and the big end of second groove section is through with knife mark hole, and the small end of second groove wall is through with first groove section; The utility model can avoid the movement track of slide vane at the cross line of the groove wall of slide vane groove and the interpenetration of spring hole, eliminates the abnormal wear of slide vane, and then improves the performance of compressor, and reduces the noise generation of compressor operation process, improves the overall adaptability and overall service life of compressor.

The utility model discloses a cooling tower spray water noise reduction device. High-temperature circulating water is uniformly sprayed to the surface of filler through a water distribution system to form a water film or water drops, the water film or water drops fall into a water pool at the bottom of the cooling tower after the water temperature is reduced and collide with accumulated water in the water pool to generate noise, and the noise belongs to high-frequency noise and disturbs residents. The device comprises a cooling tower, a spray water buffer rack is placed at the bottom of the cooling tower, the spray water buffer rack comprises an upper buffer plate, a lower buffer plate and a buoy, the upper buffer plate and the lower buffer plate are connected and fixed through a plurality of stand columns, two circles of supporting legs are fixed at the bottom of the lower buffer plate, and the two circles of supporting legs are fixed at the bottom of the lower buffer plate. The bottoms of the supporting legs are fixed on the buoy; a water collecting hole is formed in the middle of the lower buffer plate and is connected with a water conduit. The cooling tower spray water noise reduction device is used for cooling tower spray water noise reduction.

This invention application discloses a sound input / output system and a noise cancellation circuit. The noise cancellation circuit includes: a first filtering circuit for filtering a first input signal according to a first filtering coefficient to generate a first filtered signal; a signal processing circuit for generating a feedback signal based on a second input signal and an audio signal; a second filtering circuit for filtering the feedback signal according to a second filtering coefficient to generate a second filtered signal; a first multiplication circuit for multiplying the first filtered signal by a first factor to generate a first intermediate signal; a second multiplication circuit for multiplying the second filtered signal by a second factor to generate a second intermediate signal; a first addition circuit for adding the first intermediate signal to the second intermediate signal to generate a noise cancellation signal; and a second addition circuit for adding the noise cancellation signal to the audio signal to generate an output signal.