48results about How to "Meet the needs of noise reduction" patented technology

The invention discloses an adaptive ear canal active noise reduction earphone and an adaptive ear canal active noise reduction method. The earphone comprises a loudspeaker, an audio input module, a microphone, an operation module and a noise reduction processing module, the audio input module, the operation module, the microphone and the loudspeaker are all connected with the noise reduction processing module, and the microphone is arranged in a front cavity of the loudspeaker. The noise reduction method comprises the following steps that 1, an artificial ear acquires calibrated audios to obtain a third frequency response curve and a third phase curve; 2, the microphone acquires the calibrated audios and surrounding sounds simultaneously to obtain a first frequency response curve, a firstphase curve and a second phase curve; 3, the operation module conducts operation according to data obtained in the step 1 and the step 2 and a fixed algorithm to obtain a filter coefficient; and 4, the noise reduction processing module conducts noise reduction processing on the audios by using the filter coefficient. The earphone and the noise reduction method can adapt to the noise reduction requirements of various different ear canals, meet the noise reduction requirement of users and provide a good experience feeling for the users.

The invention relates to a noise cancelling control method and a relevant device. The method comprises the following steps: the target scene type of a current scene is identified through media equipment; a target noise cancelling algorithm matching the target scene type is determined according to a preset corresponding relation; a noise cancelling control instruction is generated according to the target noise cancelling algorithm; and the noise cancelling control instruction is sent to a headphone connected with the media equipment. Thus, the headphone can be switched to the noise cancelling algorithm matching the current scene through the noise cancelling control instruction, and the noise cancelling effect of the headphone can achieve the best under the current scene. Compared with the existing noise cancelling headphone which cancels noise according to a fixed noise cancelling algorithm, in the embodiment of the invention, the headphone can be switched to different noise cancelling algorithms according to different application scenes, so that the noise cancelling demands under different application scenes are satisfied, and an optimal noise cancelling effect is achieved.

The invention relates to a multifunctional compound air inlet control device of a counterflow type natural ventilation cooling tower. The multifunctional compound air inlet control device constituted by a certain number of air guide plates, air baffle plates and sound insulation plates is arranged outside the air inlet circumference of the cooling tower, wherein the multifunctional compound air inlet control device can improve air inlet uniformity of the cooling tower, improve the performances of the cooling tower, reduce the temperature of circulating water out of the tower and improve economy in operation of an unit through the air guide plates; by arranging the air baffle plates, the cooling tower can be prevented from being iced in cold winter; and by arranging the sound insulation plates, noise pollution at the periphery of the cooling tower can be further reduced.

The invention discloses a noise prediction system and method. The method comprises the steps of obtaining a gradient waveform and a corresponding sound pressure waveform in a magnetic resonance scanning process; preprocessing the gradient waveform and the corresponding sound pressure waveform; performing machine learning model training on the preprocessed gradient waveform and the corresponding sound pressure waveform to obtain a response relationship between the gradient waveform and noise; and carrying out noise prediction on gradient waveforms of different sequences by adopting the responserelationship.

The invention discloses a speech enhancement method. The speech enhancement method comprises the following steps of extracting acoustic features of each speech frame; training a progressive dual-output neural network model by using samples of the clean speech and the noise speech, estimating ideal soft masking of each speech frame by using the trained progressive dual-output neural network model,and performing enhancement processing of the acoustic features; if the speech enhancement method is applied to the human ears, reconstructing a waveform by using the enhanced acoustic features to obtain a waveform that can be subjected to subjective audiometry; and if the speech enhancement method is applied to a speech recognition system, then applying the estimated ideal soft masking to acousticfeatures of the input speech to obtain the masked acoustic features, and then reconstructing the waveform to obtain the enhanced speech. The above scheme of the invention can meet the noise reductionrequirements of the human ears and improve the recognition accuracy of the noisy speech.

The invention discloses a car active noise reduction method based on heuristic dynamic programming, and belongs to the field of active noise reduction methods of noise in car rooms. According to the car active noise reduction method, massive data in a large database of noise information in a virtual environment of a cloud server are initiatively fitted, the rule of noise frequency spectrum characteristics in the database is looked for through a model network and an execution network trained by heuristic dynamic programming, the noise data with the similar frequency spectrum characteristics arefitted together, an off-line expert library having the less data size and reduced and generated from a huge database is established, so that optimization of the noise data is achieved, and the optimal control quantity is provided for a system. According to the innovative mode, the method can overcome the drawback that an existing car active noise reduction method needs to conduct one-by-one real-time operation on the massive data, and through practical testing, the method can fully meet requirements of noise reduction of an actual traffic car under a real road condition, so that the car active noise reduction method has great market prospect and potential economic value.

The invention discloses a prefabricated track plate structure capable of absorbing wheel track noise. The prefabricated track plate structure comprises a prefabricated plate. Steel tracks are arranged on the upper surface of the prefabricated plate. The prefabricated plate is integrally arranged in a groove of a base platform. An anti-vibration pad is arranged between the prefabricated plate and the groove of the base platform. A noise absorbing plate is further arranged in the position, between the steel tracks, of the upper surface of the prefabricated plate. The noise absorbing plate is made of porous spherical particles. The two sides of a base body are provided with retaining walls. Thus, the prefabricated track plate structure capable of absorbing the wheel track noise is simple in structure, the vibration damping requirement and the noise reduction requirement are both met, the demand for the strength is also met, and meanwhile the firefighting evacuating function is achieved.

The invention belongs to the field of silencing materials, and particularly relates to a novel sound-absorbing felt. The sound-absorbing felt provided by the invention uses preoxidized polyacrylonitrile fiber as a sound-absorbing material for the first time, so as to obtain the novel sound-absorbing felt; not only the sound-absorbing felt has better acoustic performance than that of a glass wool product, but also the fiber is flexible and free of breakage, an environment pollution problem is avoided, and the sound-absorbing felt is friendly to the health of an operator; in addition, the sound-absorbing felt provided by the invention has good fire resistance and flame retardance, has an oxygen index of 50 or above, and is significantly better than other organic fibers. The preoxidized polyacrylonitrile fiber (shortened as preoxidized fiber) used by the sound-absorbing felt is an intermediate product in carbon fiber production. High-performance carbon fiber has an extremely high performance requirement on the preoxidized polyacrylonitrile fiber, a large amount of waste fiber is produced in the production process, and the waste fiber is used as a raw material for fiber sound-absorbingfelt production, so that the production cost is effectively reduced; a sound-absorbing layer produced from the preoxidized polyacrylonitrile fiber can play a very good sound-absorbing effect on a low-frequency sound source and meets a special noise-reducing need of a substation.

The invention discloses a soft damping plate for vibration absorption and noise reduction. The soft damping plate is prepared from the following raw materials in weight portion: 45 to 50 portions of asphalt as a base stock; and 18 to 20 portions of waste rubber powder, 24 to 31 portions of mud powder and 4 to 5 portions of fine sand which are used as fillers; 2 to 3 portions of polypropylene as a temperature resistant additive; and glass fibre cloth as a tire base adopts. The materials are extruded and molded through heating a stirring machine. The soft damping plate for vibration absorption and noise reduction is prepared through adopting raw materials with wide source and low price and new mixture ratio. Through actual measuration, the wasting factor of the soft damping plate reaches over 0.5; noise can be reduced by over 10 decibels; the effect of vibration absorption and noise reduction belongs to upper intermediate degree; and under the condition of equivalent noise reduction, the cost of the soft damping plate is less than one-third of that of a commercial soft damping plate. The soft damping plate can substantially reduce cost for noise reduction and has good environmental, economic and social benefits. The soft damping plate is applied to vibration control of a fan pipeline in a power plant and other large-scale enterprises, reduces the noise of the pipeline and has remarkable comprehensive benefits.

The invention relates to a manufacturing method of an equidensite elastomer sound insulation material in different thickness for vehicle. The material is formed by mixing thermoplastic elastomer, PE (polyethylene), inorganic filler barite powder and extending oil, rubber mixing, extruding to form a sheet, cutting and forming. Compared with the prior art, the sound insulation material filled by the thermoplastic elastomer and barite powder is good in physical performance and good in sound insulation function, and capable of satisfying different noise reduction requirements in different regions. On the basis that the acoustic noise reduction performance is not influenced, the material cost is reduced, the manufacturing is energy-saving and environmental friendly and the material has a certain effect on automobile lightweight.

The invention discloses a sound absorption and insulation composite member and a transformer. The sound absorption and insulation composite member includes a constrained damping sound insulation assembly and an impedance composite sound absorption assembly, wherein the constrained damping sound insulation assembly includes a rigid base layer, an elastic damping layer and a rigid constraining layerwhich are sequentially stacked, the impedance composite sound absorption assembly is stacked on the rigid base layer and includes a porous sound absorption unit and a resonance sound absorption unitwhich are sequentially stacked, and the resonance sound absorption unit includes a micro-perforated plate and a first cavity. The sound absorption and insulation composite member is advantaged in thatthe constrained damping sound insulation assembly is set, the elastic damping layer plays a role of adjusting the sound insulation amount of the rigid base layer in the low frequency band, and the rigid constraining layer plays a role of improving the noise reduction effect of the elastic damping layer; through setting the porous sound absorption unit and the resonance sound absorption unit, theresonance sound absorption unit is used for adjusting the sound absorption amount of the porous sound absorption unit in the low frequency band to match the noise characteristics of a transformer, through increase of thickness of a first chamber, the peak of a sound absorption coefficient curve gradually moves to the low frequency band, which is favorable for low frequency sound absorption.

The invention relates to an indoor substation ventilation / noise-elimination / pressure-release integrated device. The side surfaces of the indoor substation ventilation / noise-elimination / pressure-release integrated device are equipped with a plurality of double-layer sound-absorption composite boards; the front surface of a substation is a detachable wall body instead of a conventional wall body; the detachable wall body is provided with a square steel tube frame in the middle; the detachable wall body is formed by a plurality of pressure-release module boards; the pressure-release module boards are fixed to the square steel tube frame through screws; each pressure-release module board has galvanized plates at the outer sides, a fireproof rock wool layer in the middle layer and a pressure-release plate in the inner layer; the inner wall of the detachable wall body is provided with a temperature detector; the temperature detector is connected with a PLC temperature controller; the PLC temperature controller is connected with a centrifugal fan; and the centrifugal fan is arranged on the top of the indoor substation ventilation / noise-elimination / pressure-release integrated device. The advantages are that the integrated device integrates functions of sound absorption, sound insulation, ventilation, cooling and pressure release, thereby saving cost and reducing land occupation area.

The invention discloses a silencing slice. The silencing slice comprises a frame body, a flow guide tip and a flow guide cap, wherein the frame body is used for being filled with sound absorption materials, the flow guide tip is arranged at one end of the frame body, and the flow guide cap is arranged at the other end of the frame body. The silencing slice can meet the requirement for noise reduction of a ventilation system; moreover, the problem of fiber leakage of the sound absorption materials is solved, and the silencing slice can be applied to occasions with the higher cleanness requirement. In addition, compared with a traditional silencing slice, the silencing slice is lighter, convenient to mount and capable of saving more manpower and material resources.

The invention provides a wood fiber-coir composite sound absorption material and a preparation method thereof. The method includes the steps that wood fibers and coir are taken and put in a stirrer; urea-formaldehyde resin adhesive is taken, a curing agent is added into the urea-formaldehyde resin adhesive, then a foaming agent is added, and adhesive liquid is obtained; the adhesive liquid is added into the stirrer, and the wood fibers, the coir and the adhesive liquid are mixed to be uniform through stirring; and after the wood fibers, the coir and the adhesive liquid are mixed, the mixture is put in a die to be spread and pre-pressed, after a plate blank is manufactured, the plate blank is fed into a hot press to be hot-pressed, and a composite material plate with sound absorption performance is obtained. The composite sound absorption material is prepared from the wood fibers, the coir, the urea-formaldehyde resin adhesive, the curing agent and the foaming agent, all of which are evenly mixed. The natural coir and the natural wood fibers are mixed, the raw materials are renewable materials, and therefore the wood fiber-coir composite sound absorption material is environmentallyfriendly and free of pollution; and zinc oxide is used as an improver for improving, azodicarbonamide is used as the foaming agent, and the sound absorption performance of the wood fiber-coir composite material is improved.

The invention relates to a machining template used for manufacturing a flexible micro-hole sound absorbing film and a manufacturing method for the flexible micro-hole sound absorbing film. Compared with the prior art, the defect that a flexible micro-hole sound absorbing film meeting the acoustic noise reduction requirement is hard to manufacture is overcome. The machining template comprises an upper template body. The upper template body is provided with circular hole arrays. Each circular hole array comprises a plurality of circular holes. The upper template body is hinged to a lower template body. When the upper template body is pressed on the lower template body, cylinder arrays are inserted in the circular hole arrays. The diameter of cylinders ranges from 10 microns to 500 microns, and the height of the cylinders ranges from 60 microns to 3.01 millimeters. The diameter of the circular holes is larger than the diameter of the cylinders. The depth of the circular holes is larger than the height of the cylinders. The practicable, economical and environment-friendly manufacturing method and machining device are provided according to the manufacturing complexity of the flexible micro-hole sound absorbing film, and noise reduction requirements of devices of different shapes can be met.

The invention discloses a noise reducing device for a blade, the blade, a wind generating set and a noise reduction method. The noise reducing device comprises a noise reducing part and a driving part, wherein the noise reducing part comprises a noise reducing structure; and the driving part is used for driving the noise reducing part under a condition that the noise reducing part is installed atthe tail edge of a blade body so that the noise reducing part stretches or retracts relative to the blade body. According to the noise reducing device disclosed by the embodiment of the invention, thetelescopic noise reducing device is pre-embedded in the tail edge of the blade and can implement varisized shrinkage under different wind speeds so as to realize the aim of reducing noises under different wind speeds.

The invention relates to the technical field of pipeline noise reduction, in particular to a method for improving the noise reduction effect of a low-frequency noise reduction acoustic backing of a pipeline and the acoustic backing. The noise reduction effect is improved by additionally arranging a partition plate to increase the flow channel length of noise entering a cavity of a sound absorption unit of the acoustic backing. According to the technical scheme, the acoustic backing structure for prolonging the depth of the cavity of the sound absorption unit can be designed within the limited acoustic liner installation height range, the resonance sound absorption frequency band is effectively widened, the sound absorption capacity on the unit area cannot be reduced, the overall noise reduction amount is guaranteed, the acoustic backing structure can be installed on the inner walls of pipelines in various shapes, the pneumatic profile requirement is met, wind resistance is not increased, and air flow is not reduced.

The embodiment of the invention provides a video image noise reduction method, a video image noise reduction device, a computer readable storage medium and electronic equipment, and relates to the technical field of image processing. The video image noise reduction method comprises the following steps: acquiring a video image; traversing all pixel points in the video image, and carrying out weighting operation on all the pixel points and pixel points adjacent to all the pixel points, so that noise reduction of the video image is achieved. According to the invention, for each pixel point in the video image, the current pixel point is updated by carrying out weighting operation on each pixel point and the adjacent pixel points, so that time consumption can be reduced while image noise reduction is realized, and the requirement of real-time communication can be met.

The invention provides a silencer, an air conditioner and a control method of the air conditioner. The silencer comprises a silencer casing; the silencer casing is made of a piezoelectric material andcan be energized through a wire; and the silencer casing is mechanically deformed when being energized, the size of the silencer casing changes correspondingly with changes of the magnitude of current, so that the sound absorption peak frequency of the silencer changes accordingly. Through the silencer provided by the invention, the size of the silencer casing changes according to the inverse piezoelectric effect of the piezoelectric material by changing the magnitude of the current of the silencer at different operating frequencies of a compressor, thus, a sound absorption performance curveof the silencer is changed, and the sound absorption peak frequency is changed to the operating frequency, so that the noise reduction requirements at all compressor operating frequencies are met, andthe silencer has the good vibration and noise reduction performance.

The invention discloses a sound absorption and isolation composite element and a transformer, wherein the sound absorption and isolation composite element comprises a sound isolation element and an impedance composite sound absorption assembly, wherein the impedance composite sound absorption assembly is stacked on the sound isolation element, and comprises a porous sound absorption unit and a resonance sound absorption unit which are sequentially stacked; the porous sound absorption unit comprises a porous sound absorption layer and a first cavity; and the resonance sound absorption unit comprises a micro perforation plate and a second cavity. Through the arrangement of the porous sound absorption unit and the resonance sound absorption unit, the resonance sound absorption unit achieves the effect of regulating the sound absorption quantity of a low-frequency band of the porous sound absorption unit; the sound absorption coefficient of the low-frequency band can be effectively improved, and the absorption frequency band width is expanded, so that the noise features given out by the transformer are matched; along with the increase of the thickness of the first cavity, wave crests of a sound absorption coefficient curve gradually move towards the low-frequency band, so that the low-frequency sound absorption is facilitated; and along with the increase of the thickness of the second cavity, wave crests of the sound absorption coefficient curve gradually move towards the low-frequency band, so that the low-frequency sound absorption is facilitated.

The invention provides a box body structure of a capacitor, the capacitor and a power transmission system. The box body structure of the capacitor comprises a box body and a reinforcement rib structure, wherein the box body is suitably used for accommodating a capacitance component, and the reinforcement rib structure is arranged on an inner surface of the box body. By arranging the reinforcementrib structure, on one hand, reinforcement ribs protrudes towards the interior of the box body, so that the inner surface of the box body becomes uneven, diffusion reflection is formed on a sound waveby the uneven surface when noise is transferred to the box body, the noise energy is reduced, and the noise propagated to the outside is reduced; and on the other hand, the strength of the inner surface of the box body is improved by the reinforcement rib structure, the vibration amplitude of the box body can be reduced due to the strength improvement when the noise is transferred to the box body,so that the noise give out from the box body is reduced, and the integral noise of the capacitor is further reduced.

The invention discloses a car active noise reduction method based on heuristic dynamic programming, and belongs to the field of active noise reduction methods of noise in car rooms. According to the car active noise reduction method, massive data in a large database of noise information in a virtual environment of a cloud server are initiatively fitted, the rule of noise frequency spectrum characteristics in the database is looked for through a model network and an execution network trained by heuristic dynamic programming, the noise data with the similar frequency spectrum characteristics arefitted together, an off-line expert library having the less data size and reduced and generated from a huge database is established, so that optimization of the noise data is achieved, and the optimal control quantity is provided for a system. According to the innovative mode, the method can overcome the drawback that an existing car active noise reduction method needs to conduct one-by-one real-time operation on the massive data, and through practical testing, the method can fully meet requirements of noise reduction of an actual traffic car under a real road condition, so that the car active noise reduction method has great market prospect and potential economic value.

The invention provides a motor insulation support and a compressor, and the motor insulation support comprises an annular support body, and a first end and a second end are formed in the axial direction of the annular support body; the multiple winding teeth are connected to the inner wall of the annular support body, and each winding tooth comprises a radial part and an axial part which are connected with each other, and the axial part extends towards the first end; the sound absorption plate surrounds the periphery of the annular support body, and a plurality of sound absorption holes are formed in the surface, facing the first end, of the sound absorption plate. The noise generated when a refrigerant passes through can be effectively reduced by additionally arranging the perforated sound absorption structure on the insulating support, and the noise reduction requirement is met through sound absorption.

The invention provides a rail transit hole transition section protection method, and also provides a rail transit hole transition section combined protection type sound barrier. The structure of the rail transit hole transition section combined protection type sound barrier comprises a frame and auxiliary accessories, wherein the frame comprises a door-shaped frame and purlines, the purlines are fixedly connected with the door-shaped frame, so that the frame with certain bearing capacity is formed, and the auxiliary accessories comprise a protective net and a sound barrier. According to the protection method, a closed structure design is adopted, the sound barrier with sound absorption and sound insulation functions is arranged on the frame, and the noise reduction requirement of a train entering and exiting the hole section is met; the protective net is arranged at the hollow part of the top of the frame to form a closed structure, so that the safety protection of the hole section isenhanced; and due to the fact that the protective net adopts a net structure, the protective net is relatively high in permeability, so that the closed type protective sound barrier is formed withoutadditionally arranging a ventilation and smoke discharging device and a lighting device, and the protection requirement of a train entrance and exit hole section and the vehicle running requirement can be met.

The invention discloses a bubble curtain / foam board composite noise reduction method for underwater sound absorption and noise reduction. The method comprises the following steps: enabling bubbles to move upwards between two opposite porous surfaces of two foam boards to form a bubble curtain, and realizing the combination of bubble curtain noise reduction and foam material noise reduction. By means of the porous surface of the foam board, bubbles can be continuously refined through collision of the foam board and the foam board in the bubble rising process, and therefore the sound absorption and noise reduction effects of the bubble curtain are further enhanced; and the foam plate can support the bubble curtain, the influence of airflow and water flow on the bubble curtain is weakened, and the noise reduction effect is stabilized.