72 results about "Acoustic pollution" patented technology

The invention discloses a heterogeneous sensing early warning system based on decoupling perception and adversarial robust learning, and the system comprises a feature extraction module which processes heterogeneous sensor original data collected in real time through a multi-layer decoupling encoder, separates target related features and environment interference features, and suppresses noise pollution from the source; the multi-dimensional collaborative fusion module adopts a cross-domain adversarial robustness learning framework to carry out space-time sequence alignment and deep fusion on decoupling features to generate high-robustness joint representation, and a data missing problem is processed through a cross-modal generative feature completion mechanism; and the cognitive enhancement closed-loop decision module constructs a cognitive heuristic confidence evaluation model based on joint representation, realizes graded early warning by combining real-time quality scoring and behavior prediction, and dynamically optimizes system parameters through a feedback mechanism. According to the method, the problems of poor target detection robustness, high delay and low accuracy in a complex dynamic environment are solved, the detection precision is remarkably improved, the false alarm rate is reduced, and the all-weather adaptive capacity is enhanced.

The invention discloses a noise exposure evaluation method and system considering an unmanned aerial vehicle, and the method comprises the steps: obtaining urban environment data and unmanned aerial vehicle related data, carrying out the sound source modeling of the noise of the unmanned aerial vehicle, simulating the propagation of the noise of the unmanned aerial vehicle in an urban environment, and generating an unmanned aerial vehicle noise map; combining and calculating the unmanned aerial vehicle noise map and the current city noise map in combination with the current city noise map to obtain a city noise map; identifying crowd distribution conditions in different time periods and mapping the crowd distribution conditions to geographic space to form crowd distribution maps in different time periods, and performing feature identification and analysis on crowds in combination with multi-source data to obtain a crowd distribution map with crowd feature information; and according to the urban noise map and the crowd distribution map, calculating the total amount of regional noise pollution and the per capita noise pollution index, and calculating the noise exposure levels of different crowds. According to the method, the noise exposure evaluation method is perfected, and the space-time accuracy of unmanned aerial vehicle noise exposure evaluation is improved.

The invention provides a vehicle whistling control method and system, and the method comprises the steps: obtaining the environment noise data of a vehicle, and determining a reference whistling parameter according to the environment noise data; in response to a whistling instruction sent by a driver, acquiring the duration of the whistling instruction, and marking the whistling type of the whistling instruction according to the duration; under the condition that the whistling instruction is short whistling, the whistling loudness and the whistling tone are set according to a first rule, and the first rule comprises at least one of reference whistling parameters, the vehicle speed, the vehicle position and a vehicle front pedestrian sign; under the condition that the whistling instruction is long whistling, the whistling loudness is set to be first loudness, the whistling tone is set to be first tone, the first loudness is larger than the reference loudness, and the first tone is higher than the reference tone. According to the method, the whistling loudness and tone can be adjusted according to the vehicle whistling duration, the vehicle speed, whether the vehicle is in the no-whistling area or not and whether pedestrians exist in front of the vehicle or not, and then noise pollution is reduced.

This invention discloses an intelligent aging cabinet for an automatic aging system in the audio industry, relating to the field of aging equipment technology. The aging cabinet body has an inlet and an outlet on opposite sides. A first and second isolating component intermittently unblocks either the inlet or outlet. During the process from when the audio product enters the aging station to when the aging cabinet body outputs the audio product that has completed the aging test, at least one of the first and second isolating components, together with the aging cabinet body, isolates the internal environment of the aging cabinet body from the external environment. This reduces noise pollution to the surrounding environment. Thus, while some audio products are still undergoing aging tests inside the aging cabinet, some audio products that have completed the aging test can be output from the aging cabinet body, while simultaneously inputting some audio products awaiting aging tests into the aging cabinet body. This shortens the waiting time for inputting and outputting audio products, resulting in higher overall efficiency when aging tests are performed on batches of audio products.

The present application relates to the technical field of coal mine machinery and equipment, and discloses a special extractor for coal mine cutting head pick, which comprises a connecting rod, a baffle is fixedly connected to the connecting rod, a buffer assembly is arranged on one side of the baffle, a flail is slidably sleeved in the middle of the connecting rod, a shovel type steel plate is fixedly connected to one end of the connecting rod away from the baffle, a protection assembly is arranged on one end of the connecting rod close to the shovel type steel plate, and a power assembly and a transmission assembly are arranged in the protection assembly; the buffer assembly is arranged, the cylindrical limiting structure of the protective sleeve and the sound insulation pad on the inner side are used, so that the flail is always limited in the protective sleeve during the sliding and impacting process, the hands of the operator are effectively prevented from being pinched, the sound insulation pad can greatly absorb the high-frequency metal noise generated when the flail impacts the baffle, the defects that the flail is completely exposed in the traditional extractor, the extrusion injury is easily caused, and the noise pollution is serious underground are made up for, and the safety and operation comfort of the extraction operation are significantly improved.

The invention relates to the technical field of building external envelope structures and green building energy conservation, in particular to an acoustic super-structure composite unit and a glass curtain wall, the acoustic super-structure composite unit comprises a first substrate, a second substrate and a middle substrate arranged between the first substrate and the second substrate; a local resonance module is arranged on the middle-layer substrate; a through hole is formed in the middle-layer substrate; a frame structure is further included; a first convex edge and a second convex edge are arranged on the frame structure; by integrating the photovoltaic module, the local resonance module, the middle-layer substrate and the thermal insulation layer formed by aerogel, on the premise that the thickness and the weight are not remarkably increased, the problem of function mutual exclusion among broadband noise pollution, heat loss and energy self-sufficiency is solved, and the thermal insulation effect is improved. And collaborative improvement of multi-physical field performance is realized.

The invention provides a blade, a propeller, a power propelling device and a ship, and relates to the technical field of propeller noise control, and the blade comprises a blade root, a blade body and a blade tip which are connected in sequence; the blade body is provided with a first pressure surface and a first suction surface which are oppositely arranged, and in the rotating process of the paddle, fluid can flow from the position of the first pressure surface to the position of the first suction surface; at least a portion of the blade tip is curved toward the first pressure surface. According to the technical scheme, at least one part of the blade tip is bent towards the first pressure surface of the blade body, so that the design mode is beneficial to structural optimization of the blade tip, vortex-induced resonance can be inhibited to a great extent, and noise pollution is reduced.

The invention relates to the field of image data processing, in particular to a ring-scan sonar two-dimensional imaging data processing method and system, and the method comprises the steps: obtaining a ring-scan sonar image, carrying out the superpixel segmentation of the ring-scan sonar image, taking any superpixel block as a target block, calculating the average noise pollution degree and the average echo signal intensity of the target block, and obtaining the ring-scan sonar two-dimensional imaging data. Taking the ratio of the average echo signal intensity to the average noise pollution degree as the comprehensive weight of a target block, taking the comprehensive weight of the target block as the comprehensive weight of each pixel point in the target block, and traversing to obtain the comprehensive weight of each pixel point of each super-pixel block, constructing a weight map aligned with the ring scan sonar image according to the comprehensive weights of all the pixel points of all the superpixel blocks; and taking the ring scan sonar image and the weight map as dual-channel input of a preset detection model to obtain a detection result. According to the invention, the target detection precision of the ring scan sonar is improved.

The utility model discloses a noise elimination structure, equipment and light storage system, the noise elimination structure is installed at an air inlet and / or an air outlet, the noise elimination structure comprises an outer frame, a blocking part and a first sound absorption part, the edge of the outer frame is formed by connecting an arc section and a plurality of continuous straight line sections or arc lines and straight line sections in a matched mode, the blocking part comprises a plurality of cavities, and the first sound absorption part comprises a first sound absorption part and a second sound absorption part. The cavity is formed by abutting one end of the first partition plate and / or one end of the second partition plate against the outer frame, the inclination angle of the second partition plate relative to the air inlet and / or the air outlet is larger than or equal to 0 degree and smaller than or equal to 180 degrees, and the first sound absorption part covers the blocking part. According to the technical scheme, noise at the air inlet and / or the air outlet can be reduced, sound leakage and sound pollution are reduced, and normal life and physical and psychological health of residents are facilitated.

This invention discloses a multi-layer composite sound-absorbing device. The double-layer micro-perforated plate of this invention includes an upper micro-perforated plate and a lower micro-perforated plate, which are connected by a disc spring device. The upper and lower micro-perforated plates are connected around their perimeter by a frame, ensuring the disc spring device between them is compressed. The density gradient porous sound-absorbing material layer is composed of at least two layers of sound-absorbing material with different densities stacked together. This multi-layer composite sound-absorbing device is composed of resonant and resistive sound-absorbing materials, achieving excellent low-frequency broadband sound absorption, effectively solving low-frequency noise pollution problems in substations, converter stations, and other fields. By adjusting the plate spacing to change the compression state of the disc springs, different stiffness characteristics are obtained, thereby enhancing the resonant sound absorption effect for specific frequency bands of noise and specifically improving the sound absorption coefficient of the device for specific frequency bands of noise.

The utility model provides a sound amplification unit capable of controlling a sound field range. The sound amplification unit comprises a sound gathering cover and a linear sound source sound post arranged in the sound gathering cover. The line sound source sound columns comprise medium-high frequency sound columns and low-frequency sound columns which are arranged back to back, and the low-frequency sound columns face the opening direction of the sound gathering cover. The cross section of the sound gathering cover is in the shape of a first-order parabola or a second-order combined parabola. The sound amplification unit forms a sound field control system, realizes effective control of the diffusion range of sound waves, and can effectively reduce sound pollution and sound interference caused by sound leakage and sound staining.

The utility model discloses a bolt assembly reinforced edge support variable cross-section steel-concrete light combined cover plate which comprises two first side plates and two second side plates, the two first side plates and the two second side plates form a rectangle and are fixed in a welding mode, the bottom of each second side plate is fixedly connected with an edge bottom plate, and the edge bottom plate is fixedly connected with a bolt assembly. The edge bottom plate is fixedly connected with an edge plate, the edge plate is arranged on the inner side of the second edge plate, one side of the edge plate is fixedly connected with the first edge plate, and the other side of the edge plate is fixedly connected with the edge plate. The self-weight of the component is reduced by adopting a variable cross-section form; edge supports are additionally arranged, and the edge bearing capacity is enhanced; bolt connection is adopted, and collision damage and sound pollution are reduced; and the connecting part is covered by a rubber pad to prevent the influence of rainwater and dust.

The invention discloses a ducted unmanned aerial vehicle, and relates to the technical field of electric vertical take-off and landing aircrafts, the ducted unmanned aerial vehicle comprises a fuselage and a propulsion assembly, the front side and the rear side of the fuselage are provided with a front battery bin and a rear battery bin respectively, the propulsion assembly comprises ducts arranged on the left side and the right side of the fuselage, and motors are arranged at the bottoms of propellers; the motors are electrically connected with batteries in the front battery bin and the rear battery bin through wires, the motors are connected with a flight control system, and the flight control system is used for controlling the rotating speed of all the motors and the thrust direction of all the propelling assemblies. According to the duct type unmanned aerial vehicle, the duct serves as a natural sound barrier, noise generated by the propeller can be reduced, the duct directly radiates noise outwards by restraining blade tip vortex, wake flow is smoothly restrained to reduce turbulence noise, and the multiple blades and the small diameter of the propeller are matched with an acoustic liner to absorb noise in the high-frequency range; therefore, the noise pollution problem of the unmanned aerial vehicle is obviously improved in multiple modes.

The present invention discloses an air conditioner, which includes: an indoor unit, an outdoor unit and a controller. The indoor unit is provided with an oxygen concentration sensor and a fresh air module; the outdoor unit is provided with an oxygen increasing module and an oxygen storage module; the controller is configured to obtain the indoor oxygen concentration value detected by the oxygen concentration sensor, control the operation of the fresh air module when the indoor oxygen concentration value is less than the first preset value and not less than the second preset value, control the oxygen storage module to communicate with the indoor unit when the indoor oxygen concentration value is less than the second preset value and not less than the third preset value, and control the oxygen storage module to communicate with the indoor unit and the oxygen increasing module to operate when the indoor oxygen concentration value is less than the third preset value. The present invention ensures that the indoor oxygen concentration value meets the normal needs of indoor users, takes into account noise pollution at the same time, reduces noise pollution while increasing the oxygen concentration in the indoor space, improves the indoor air quality, and improves the user experience.

This invention proposes for the first time a high-modulus, high-resilience lightweight material. It introduces a dissipative cavity with nanoscale wall thickness within a high-density graphene honeycomb framework prepared by freeze-drying using solvent plasticizing foaming technology. This nanoscale wall thickness provides strong resistance to deformation and allows for reversible elastic buckling deformation along the direction perpendicular to the load under load, thus exhibiting high strain recoverability at high modulus. The prepared lightweight graphene bulk material shows great potential for multiple protections against electromagnetic radiation, high temperatures, and noise pollution, and can be used as a multifunctional structural material in engineering applications.

A mute wallboard suitable for being installed on walls of multiple specifications comprises a flexible sound insulation layer and a plurality of decoration strips arranged on the surface of the flexible sound insulation layer at intervals. Each decoration strip comprises a core layer and at least one decoration layer arranged on the side wall of one side of the core layer, and each core layer comprises a noise reduction structure layer and at least one waterproof layer arranged on the noise reduction structure layer. The decorative layer comprises at least one acoustic wave impedance layer arranged on the side wall of one side of the core layer, a pattern layer arranged on the side, opposite to the core layer, of the acoustic wave impedance layer, and a protective layer arranged on the pattern layer. The mute wallboard suitable for being installed on the walls of the multiple specifications can be fixed on the walls of different shapes, voice definition of a room is achieved, and noise pollution is reduced.

The utility model discloses a fixing frame of a noise pollution microphone, which relates to the technical field of microphone fixing and comprises a supporting part and a clamping part. The supporting part comprises a supporting seat, supporting legs and the like, the supporting legs can be expanded to increase the supporting area by supporting linkage structures such as adjusting knobs, and an arc-shaped groove in the bottom of the supporting part can increase the ground friction force. The clamping part is adjustably arranged on the supporting seat, the height is adjusted through the first clamping adjusting knob, the angle and direction of the microphone are adjusted through the cooperation of the second clamping adjusting knob and a related structure, the microphone can be stably clamped through the silica gel material on the clamping block, and the top clamping baffle can prevent rainwater erosion. The fixing frame solves the problems that an existing fixing frame is insufficient in stability, inconvenient to adjust and poor in protection performance, and has the advantages of being high in stability, flexible and accurate to adjust, capable of prolonging the service life of equipment and the like.

The invention relates to a transformer substation ventilation and noise reduction method and device based on a self-adaptive filtering algorithm. The method comprises the following steps: carrying out data acquisition on noise of a transformer substation ventilation system; establishing a filtering-XLMS algorithm model; constructing a model based on an improved variable step size LMS algorithm; and analyzing and processing the noise data of the ventilation system of the transformer substation, and outputting a reverse counteracting signal through the controller to counteract the noise of the ventilation system of the transformer substation. According to the principle of sound wave interference offset, corresponding waveforms can be generated in a self-adaptive mode according to fan noise changes to drive the loudspeaker to form negative signals, fan noise signals are offset, and the purpose of active noise elimination and reduction of the transformer substation ventilation system is achieved. The transformer substation noise pollution abatement problem is solved, the problem that transformer substation noise disturbs residents in an urban area is solved, and the high-quality service level of a power grid is improved.

The application discloses an aviation electromagnetic data processing method and system based on a ground reference point, and comprises the following steps: arranging a transmitting source, collecting first response electromagnetic data corresponding to a plurality of air measuring points; selecting a plurality of ground reference points along the direction of the transmitting source, collecting second response electromagnetic data; performing forward simulation on the first response electromagnetic data after preprocessing, and obtaining a difference value between the ground and the air; loading the difference value into the second response electromagnetic data, and obtaining a reference correction value of any air measuring point in a to-be-detected region by using an interpolation method to obtain third response electromagnetic data; presetting an amplitude difference threshold, comparing the amplitudes of the first response electromagnetic data after preprocessing and the third response electromagnetic data, obtaining a frequency range of motion noise pollution corresponding to an amplitude difference greater than the amplitude difference threshold; and in the frequency range of motion noise pollution, extracting field value amplitudes of the ground reference points and the air measuring points, and performing denoising correction processing by using a least mean square error algorithm.

The utility model discloses a highway sound insulation screen with a protection structure, which relates to the technical field of sound insulation screens, and comprises a sound insulation assembly, a concrete pile, vertical rods arranged at equal intervals on the concrete pile, a sound insulation plate arranged between adjacent vertical rods, and a protection assembly, which comprises a second protection plate and two first protection plates, the two first protection plates cover the upper portion and the lower portion of the second protection plate respectively, and the elastic supporting assembly is installed on the vertical rod. The sound insulation screen is reasonable in design structure, the second protection plate and the two first protection plates of the protection assembly are used in cooperation, comprehensive protection on the sound insulation assembly is provided, a protection blind area possibly existing in a traditional design is avoided, a sound insulation fence is additionally formed, and therefore the overall sound insulation effect of the sound insulation screen is remarkably improved, and the sound insulation effect is improved. Therefore, even in a complex and changeable road environment, the sound insulation screen can effectively reduce noise pollution and provide better acoustic protection for the surrounding environment.

The application relates to the field of rotors, in particular to a rotor structure with good noise reduction effect and a flying car. The rotor structure with good noise reduction effect comprises a bionic convex and a rotor body, the bionic convex comprises a rotating side and a round corner side, the rotating side is connected with a driving structure, and the round corner side is in contact with a spring, the bionic convexes are arranged in an array at the tail end of the rotor body, and the rotor body is also provided with rotor holes in an array for placing the bionic convexes and the springs. The bionic convexes can be extended at low speed, so that the rotor is subjected to noise reduction, and the bionic convexes can be retracted at high speed, so that the noise of the flying car can be reduced, sound pollution can be reduced, and the application prospect is wide.

The utility model belongs to the field of noise pollution prevention and control, concretely relates to convenient dismouting modularization noise pollution prevention and control equipment, including sound absorption board, the inside of sound absorption board is provided with a plurality of evenly distributed sound absorption hole, the left and right ends of sound absorption board all are fixedly connected with fixed block, the outside of fixed block is connected with the slide of connecting seat, the outside of connecting seat is fixedly connected with fixed seat, the back of fixed seat is connected with the slide of mounting seat. The utility model discloses the effect of the design sound absorption board, can play the purpose of noise pollution prevention and control, can realize the installation fixed of overall structure under the effect of mounting seat, and under the plug -in cooperation of ball and groove, can connect fixed block and connecting seat and fix, realize the fixation of sound absorption board, and through the sound absorption board of pushing can fixed block from the inside slide of connecting seat and take out, can conveniently dismantle sound absorption board, and sound absorption board adopts combined type setting, can conveniently carry out nimble dismounting.

This invention discloses a silent pollution-free water jet generator and a method for studying the noise performance of water jets. The silent pollution-free water jet generator includes, in sequence, a first elbow, a first transition pipe, a solenoid valve / flowmeter assembly, a second transition pipe, a second elbow, and a nozzle section, all sealed together. One end of the first elbow is sealed to an outlet on one side of the housing. The method for studying the noise performance of the water jet comprises the following steps: Step 1: Determine the vertical distance between the bottom surface of the housing and the center of the nozzle section; Step 2: Assemble the silent pollution-free water jet generator and hoist the housing onto a platform frame, adjusting the frame height to meet the testing requirements; Step 3: Fill the housing with water; Step 4: Obtain the water jet velocity, and begin measuring the noise after reaching the required velocity. This invention uses water gravity to generate a water jet to study its noise performance, significantly reducing interference caused by the noise of the device itself.

The application discloses a wind-fish integration layout optimization method and device considering offshore wind power underwater noise, equipment and storage medium, relates to the seawater culture engineering technical field, and comprises the following steps: based on the linear relationship between wind speed and noise source sound source level and the noise attenuation model with underwater distance, an underwater noise propagation model of a wind turbine generator unit is established; based on the wake effect of the wind turbine generator unit, a power generation calculation model of a wind farm is established; based on a target function with the purpose of maximizing total power generation, a wind turbine generator unit spacing constraint and a noise limit constraint of a culture area, an optimization model is constructed; the wind turbine generator unit coordinates and the culture net cage coordinates are taken as inputs of the optimization model, the optimization model is solved, and the optimized layout positions of the wind turbine generator unit and the culture area are obtained, so that the single economic perspective of only considering power generation efficiency in traditional wind farm planning is broken through, the underwater noise pollution is taken as a core constraint and integrated into the layout optimization, and therefore, the contradiction between marine energy and resources is reduced.

The invention relates to the field of rotors, in particular to a rotor structure with a good noise reduction effect and an aerocar. The rotor structure with the good noise reduction effect comprises bionic protrusions and a rotor body, each bionic protrusion comprises a rotating side and a round corner side, the rotating sides are connected with a driving structure, the round corner sides make contact with springs, and the bionic protrusions are arranged at the tail end of the rotor body in an array mode; rotor wing holes used for containing the bionic protrusions and the springs are further distributed in the rotor wing body in an array mode. The bionic protrusions can stretch out at a low speed, so that noise reduction is conducted on the rotor wings, the bionic protrusions are retracted at a high speed, noise of the aerocar can be reduced, sound pollution is reduced, and the aerocar has wide application prospects.

The invention relates to a square dance noise data processing method, and relates to the field of smart cities, and the method comprises the steps: obtaining a resident at-home probability set of a noise coverage area according to the matching of a current playing interval; by utilizing a noise region simulation space, according to the current meteorological data and the resident at-home probability set, performing sound layout parameter iterative optimization by taking a sound movable region range as an optimization space and taking the minimum overall noise influence as a target, and outputting an optimal position and an optimal angle; and placing the sound in the current playing interval according to the optimal position and the optimal angle, and continuing to optimize the sound placement. According to the invention, the technical problem that the regional noise influence is difficult to effectively control because the traditional method cannot reasonably select the activity field and sound layout of the square dance in combination with the actual scene can be solved; scientific and reasonable arrangement of a square dance activity site and sound equipment layout can be improved, regional noise pollution is reduced to the greatest extent, and intelligent and scientific urban noise management is realized.

The invention discloses an aerodynamic noise prediction method and device and electronic equipment, and belongs to the technical field of acoustics. Comprising the following steps: constructing a sound pressure convection equivalent source model between frequency domain disturbance pressure and convection equivalent source intensity and constructing an acoustic velocity convection equivalent source model between frequency domain disturbance velocity and convection equivalent source intensity according to a first grid node position in a non-closed permeable surface and a convection equivalent source position and angular frequency in a closed equivalent source surface; and determining the convection equivalent source intensity according to the two convection equivalent source models, and further determining the sound pressure and the acoustic velocity of the far-field observation point by combining the position of the far-field observation point and the position of the convection equivalent source. According to the method, the convection effect of a moving medium is considered, far-field noise propagation is predicted by constructing a convection equivalent source model according to a non-closed permeable surface transient flow field without turbulence pulsation components, the false sound radiation phenomenon of a permeable surface is effectively avoided, and false-sound-pollution-free prediction of sound pressure and acoustic speed in the moving medium can be achieved at the same time.

The invention relates to the technical field of crushing equipment, in particular to low-noise environment-friendly crushing equipment for SRF production and a using method thereof.The low-noise environment-friendly crushing equipment comprises a crushing treatment device and control machine table equipment, a controller is fixedly connected to the front end of the control machine table equipment, and a material treatment device is installed on the inner side of the control machine table equipment; the top end of the control machine table equipment is fixedly connected with a crushing treatment device, the material treatment device comprises a sound insulation vertical plate, one side of the sound insulation vertical plate is fixedly connected with an inner hollow plate, the inner side of the inner hollow plate is fixedly connected with a sound insulation material frame, and the inner side of the inner hollow plate is fixedly connected with a discharging mechanism; a first hydraulic rod and a second hydraulic rod are fixedly connected to the inner side of the sound insulation protective shell, and a pressing block is fixedly connected to the bottom end of the second hydraulic rod. According to the equipment, the collision probability in the crushing process is reduced, the resonance effect is effectively prevented, and therefore the noise level is remarkably reduced, and sound pollution to the surrounding environment is relieved.

The utility model belongs to the technical field of ultra-silence generator sets, and particularly relates to a generator partition device for an ultra-silence generator set, which comprises a partition bin mechanism arranged between a generator and an engine and suitable for separating the generator from the engine. The connecting mechanism is arranged on the unit shell, connected with the compartment mechanism and the unit shell and suitable for fixing the compartment mechanism to the unit shell, the engine and the generator are separated in the two cavities in the unit shell through the compartment mechanism, and therefore heat of the engine and the generator is dissipated independently, and the heat dissipation efficiency is improved; and the sound insulation sponge is attached to the bin separation mechanism, noise in the generator set shell can be absorbed, and noise pollution is reduced.

The utility model provides a sound amplification system capable of controlling a sound field range. The sound amplification system comprises more than two sound amplification units and a pointing mechanism used for connecting and adjusting the sound amplification units. Wherein the sound amplification unit comprises a sound gathering cover and a linear sound source column loudspeaker arranged in the sound gathering cover, so that a sound field control system is formed, the diffusion range of sound waves is effectively controlled, and sound pollution and sound interference caused by sound leakage and sound dyeing can be effectively reduced. The pointing mechanism can adjust the sound field range according to the needs of the application scene.