77results about How to "Good noise reduction" patented technology

The invention provides a method for executing active noise reduction for an earphone in an electronic terminal and an electronic terminal thereof. The method comprises: (A), detecting a type of an earphone connected with an electronic terminal; (b), setting an active noise reduction parameter according to a detection result; and (C), on the basis of the set active noise reduction parameter, generating a noise reduction signal for eliminating environment noises and outputting the noise reduction signal by the earphone. According to the method and the electronic terminal, proper active noise reduction parameters can be set according to various earphones, so that good noise reduction effects can be relized for various earphones.

The invention relates to a composite modified asphalt of styrene butadiene styrene block polymer (SBS) and rubber powder and a preparation method thereof. The modified asphalt comprises 0.3-0.4% of a stabilizer, 0.03% of an activating agent, 10-15% of rubber powder, 2% of SBS, 3-4% of styrene-butadiene rubber extending oil and the balance of matrix asphalt, wherein the total weight meets 100%. The preparation method of the modified asphalt comprises the steps of dividing the matrix asphalt into two equal mass of parts, firstly, preheating the first part to 125+ / -2 DEG C; adding the SBS and the styrene-butadiene rubber extending oil to heated asphalt to shear and disperse at medium and high speeds; adding the rubber powder and the activating agent to the other part of matrix asphalt, swelling for 2 hours at 160 DEG C, finally shearing and dispersing the two parts of mixtures for 1 hour under the condition of 180 DEG C, and then adding the stabilizer, and cutting and developing for 1 hour at a low speed and then preparing the composite modified asphalt of rubber powder / SBS. The composite modified asphalt of the SBS and the rubber powder disclosed by the invention has the advantages that the composite modified asphalt is fully swelled; the noise-reduction is obviously reduced; and the preparation method is reasonable in construction technology, low in energy consumption, and excellent in performance of the composite modified asphalt.

The invention discloses a range hood centrifugal fan with a double air inlet structure. The range hood centrifugal fan comprises a volute and an impeller arranged in the volute, the volute comprises a front cover plate, a rear cover plate, an annular middle shell and volute tongues, the annular middle shell is connected between the front cover plate and the rear cover plate, a motor is arranged at the center of the impeller, each volute tongue is provided with a volute tongue surface projecting along a direction far away from the joint of the volute tongue and the shell, each volute tongue surface comprises a front inclined curved surface and a rear inclined curved surface which are asymmetric and are in smooth transition connection, and the intersecting line of the two inclined curved surfaces is the outermost projection of the volute tongue surface. By the aid of the bidirectionally inclined volute tongues, distribution of the inclined curved surfaces conforms to airflow velocity distribution, a new noise source generated at the volute tongue more effectively offsets part of original noise, and noise reduction capacity is improved. The intersecting line of the two inclined curved surfaces of each bidirectionally inclined volute tongue is aligned to a central disk of the impeller as far as possible, the inclined directions of the volute tongues corresponding to air inlets in two sides of the double air inlet impeller are consistent, and better noise reduction effects are achieved.

The invention discloses a mute water discharging pipe, belonging to the field of pipe materials. The mute water discharging pipe not only has a good noise reducing effect, but also has good mechanical performance, and has a three-layer structure, wherein the inner layer and the outer layer are polypropylene felts, and the middle layer is a sound-absorbing core layer; and the sound-absorbing core layer comprises the raw materials in parts by weight: 100-200 parts of polypropylene resin and 20-100 parts of noise-absorbing material, wherein the polypropylene resin is made of block copolymerized polypropylene, homopolymerized polypropylene or random copolymerized polypropylene; and the noise-absorbing material is selected from at least one of wollastonite, calcium carbonate, talcum powder, barium sulfate and silicon dioxide. The mute water discharging pipe disclosed by the invention has the advantages of excellent muting effect, superstrong chemical corrosion resistance, excellent high temperature resistance, good impact resistance, long service life and the like.

The virtual sound shelter includes error microphone array, secondary loudspeaker array and controller. The error microphone array is distributed around the area to be controlled and is used for enveloping the area to be controlled, the secondary loudspeaker array is distributed in the periphery of error microphone array, the controller can be used for receiving signal of error microphone array and controlling the output of secondary loudspeaker array so as to reduce the noise of the area enveloped by error microphone array.

The invention discloses a permeable pavement structure which is provided with a surface layer of a porous bitumen mixing material, a middle surface layer of the porous bitumen mixing material, a permeable open grading lower surface, a grading gravel base layer, a filtering layer, a geotextile layer and a soil base layer from top to bottom. The invention overcomes the defects caused by the watertightness of a traditional pavement, provides the pavement structure with good noise reducing and skidproof functions and good pavement performance of high temperature stability, abrasion resistance, fatigue resistance, water damage resistance and the like, and is widely applied to various roads of sidewalks, parkways, bicycle roads, parking lots, residential quarters and the like.

The invention discloses an intake silencer of compressor, which comprises an upper cover, an intake tube element and a lower frame. Wherein, the upper cover is mounted with intake tube; the lower frame is mounted with an air entry and an intake tube; the air entry, intake tube, intake tube element and the intake tube of upper cover form the intake path of coolant; the baffle on the intake tube element divides the chamber of silencer into left silence chamber and right silence chamber; the intake tube element of left silence chamber has two or more bypass ports. The invention, via adjusting and optimizing the intake path, the area of bypass ports and the filter screen, obtains better intake efficiency and silence effect, while the whole noise of compressor can be reduced 3dB.

The invention relates to a dense-graded asphalt concrete with continuous skid-resistant and noise-reduction functions. The dense-graded asphalt concrete is prepared from a coarse aggregate, a fine aggregate, packing and asphalt according to the matching requirements of dense-graded asphalt concrete. The dense-graded asphalt concrete is characterized in that the coarse aggregate comprises the following components in percentage by weight: 0-50% of common coarse aggregate and 50-100% of functional aggregate, wherein the functional aggregate is of a core-shell structure and composed of a porous core matrix and an alkaline surface activated shell layer, the porous core matrix takes mullite as a main ore phase and formed into a continuous phase, air holes are distributed in the continuous phase, the diameters of the air holes are distributed in a multistage mode, and the small holes mainly include micron small holes; and the ore phase of the alkaline surface activated shell layer mainly comprises dicalcium silicate, tricalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite. The dense-graded asphalt concrete disclosed by the invention is good in bearing capacity, excellent in water damage resistance and continuous skid-resistant and noise-reduction functions and good in durability, and has a broad application prospect.

The invention discloses a live broadcast noise reduction method. The method comprises the following steps: determining a selected preset noise sample according to input selection information; performing noise reduction processing on an original audio file via a noise reduction model according to the preset noise sample to obtain a final audio file; and outputting the final audio file to a live broadcast server. By adoption of the method, the noise reduction processing is performed on the original audio file via the noise reduction model according to the noise sample selected by a user for filtering, and the live broadcast viewing experience and the competitiveness of a live broadcast platform are improved by the live broadcast noise reduction method, which is more targeted, selective and better in noise reduction effect, in the case that the noise cannot be avoided.

A disclosed rectification acceleration disc structure of a range hood comprises a rectification plate exactly facing to an air inlet of a smoke-collecting cover of the range hood; one side, facing to the smoke-collecting cover, of the rectification plate is provided with an acceleration disc; the acceleration disc comprises at least one side surface, and an acceleration channel for accelerating oil smoke is formed between the side surface and the smoke-collecting cover; and the sectional area of the acceleration channel from bottom to top is gradually reduced. by additionally adding the acceleration disc on the side, facing to the smoke-collecting cover, of the rectification plate, the rectification acceleration disc structure is formed, and the diameter-reducing oil-smoke acceleration channel is formed, oil smoke is divided into flows and is absorbed, and is accelerated in a diameter-reducing way, and a stable negative-pressure annular area is formed at the inner-side circumference of the rectification plate and relatively to the periphery, continuously-rising oil smoke is dynamically continuously gathered and is accelerated and absorbed into a blower fan, so that the range hood reaches the optimum maximal peripheral stable smoke gathering absorbing effect, and kitchen smell is reduced to a lowest density.

The invention relates to an active noise reduction in-ear type earphone, and relates to the technical field of communication. The active noise reduction in-ear type earphone comprises an earphone shell, a rear cavity, an intermediate cavity and a front cavity are arranged in the earphone shell, a feedforward microphone is arranged in the rear cavity in a transverse manner, the bottom of the front cavity is a sound outlet used for transmitting sounds, a feedback microphone is arranged in the front cavity, the earphone shell is also provided with a front cavity air vent hole communicating with the front cavity, the front cavity air vent hole is located on the earphone shell with the same direction of a feedforward sound-receiving port, and an included angle between the central axis of the front cavity air vent hole and the central axis of the feedforward sound-receiving port is less than 90 degrees. Compared with the conventional earphone, noises enter the earphone from the front cavity air vent hole, when the noises entering the front cavity air vent hole are from different directions, channels from which the noises enter an ear canal are more consistent, the changes of the active noise reduction performance are more consistent in high frequency, and the filter targets of different noises entering the front cavity air vent hole from different directions are more consistent.

The invention relates to the technical field of wallboards, and discloses a prefabricated low-mass, heat-preservation and noise-reduction wallboard and a preparation method thereof. The wallboard comprises a three-layer structure: two outer side layers are reinforced concrete layers, and a middle layer is a porous mixture sandwich layer; reinforcements penetrating through the three layers are arranged in the wallboard; and bamboo and wood mixed fibers are arranged in the porous mixture sandwich layer. The preparation method comprises the following steps: 1) one reinforced concrete layer is prepared; the reinforcements are embedded before solidification; and the two ends of the reinforcements penetrate through the surface of the reinforced concrete layer; 2) after solidification, the reinforced concrete layer is in vertical butt joint with the other reinforced concrete layer just cast; and the reinforcements are inserted in the other reinforced concrete layer to form a two-layer hollowbody; 3) after solidification, the hollow body is vertical for pouring casting materials in the porous mixture sandwich layer; and 4) finished products are obtained after curing in constant-temperature and constant-humidity environments. The wallboard is novel and unique in structure, low in weight, excellent in heat preservation and noise reduction effect and quick in transportation and installation, and can realize large-batch assembly type automatic production.

The invention relates to a churndrill noise-reducing sleeve comprising an inner sheath and an outer sheath. The upper end of the outer sheath is provided with a rubber ring; the outer sheath and the inner sheath are connected by a sliding pin; the top inside the outer sheath and the upper end surface of the inner sheath are connected by a spring; and two to three layers of expanded silencers formed by ring-shaped clapboards with holes are adhered to the inner wall of the outer sheath. Due to the adoption of double-layer light thin materials and the adhering installation of the two to three layers of ring-shaped clapboards on the inner wall of the outer sheath, sound is effectively absorbed in the separating cavity formed by each clapboard and noise-reducing effect is comparatively good. Compared with the traditional churndrill, the churnadrill noise-reducing sleeve greatly lowers floating quantity of dust in air, reduces pollution to environment and simultaneously decreases influencesof floated dust on health of constructers. Besides, the churndrill noise-reducing sleeve can be matched with various types of churndrills and electric drill for use. After the churndrill is provided with the noise-reducing sleeve, possibility of flying out of a drill bit is greatly reduced and the safety of working is enhanced.

The invention discloses an acrylate damping coating and a preparation method thereof. The acrylate damping coating comprises, by weight, 20-35 parts of water, 1-3 parts of an aqueous disperser, 10-18 parts of calcium carbonate, 20-35 parts of talcum powder, 7-11 parts of a fire retardant, 0.5-2 parts of an aqueous antifoaming agent, 50-110 parts of a propionate emulsion, 0.1-1.5 parts of a thickener, 0.1-3.3 parts of a damping pigment filler and 0.5-1.8 parts of a film forming assistant. The propionate emulsion is adopted in the preparation process of the acrylate damping coating, so the damping performance of the coating in high and low temperature state is improved, and the coating also has the advantages of good noise reduction effect, non-toxicity, no peculiar smell, hard film, good gloss retention, good durability and good pollution resistance.

The invention discloses a range hood. The range hood comprises an air inlet assembly, a fan frame arranged above the air inlet assembly and a fan system arranged in the fan frame, wherein the fan system is provided with a main air inlet facing backwards and an auxiliary air inlet facing forwards, the range hood further comprises first flow deflectors and second flow deflectors arranged in the fanframe, the two first flow deflectors extend in the front-back direction and are arranged below the left side and the right side of the fan system correspondingly, each first flow deflector gradually inclines downwards from front to back, the two second flow deflectors extend in the front-back direction and are arranged below the left side and the right side of the fan system in a left-right movingmode correspondingly, and each second flow deflector gradually inclines downwards from front to back. The invention further discloses a control method of the range hood. Compared with the prior art,the range hood and the control method have the advantages that vortexes inside the range hood and separated boundary layers of air flow can be adjusted, so that the air flow impact on an impeller of the fan system is relatively uniform.

The invention provides a flexible shock-absorption and noise-reduction gear. The flexible shock-absorption and noise-reduction gear comprises a gear body, a rubber shock-absorption disc and a twisting press disc, wherein the rubber shock-absorption disc is arranged between the gear body and the twisting press disc and is respectively fixedly connected with the gear body and the twisting press disc, and power or torque is input through the twisting press disc or the gear body, passes through the rubber shock-absorption disc and then is output through the gear body or the twisting press disc. The power or torque is output through the gear body or the twisting press disc after being subjected to the shock absorption and isolation action of the rubber shock-absorption disc, the design that the gear body and power input and output components are separated is adopted, the power or torque input and output components are separated, and the flexible shock-absorption and noise-reduction gear has good noise-reduction and shock-absorption functions, is obvious in effect of twisting vibration noise reduction, and improves transmission stability.

The present invention discloses a motor active noise reduction method and system. The method comprises: building the corresponding relation of harmonic waves and motor noise according to the power supply parameters of a converter, the motor parameters of the motor supplied by a converter and the motor noise generated in the parameter conditions; obtaining the current power supply parameters and the current motor parameters when the converter supplies power to the motor; determining the noise generated by the motor at present according to the current power supply parameters, the current motor parameters and the corresponding relation; and generating sound having the same amplitude and frequency as the noise generated by the motor at present and opposite phases from the noise generated by the motor at present to eliminate the noise generated by the motor at present. In the process of the motor control, after determining the noise generated by the motor at present, the motor active noise reduction method and system generate sound having the same amplitude and frequency as the noise generated by the motor at present and opposite phases from the noise generated by the motor at present to perform orienteering and accurate elimination of the noise generated by the motor at present and actively reduce the influence of the converter harmonic waves on the motor noise so that the active noise reduction is reduced and the noise reduction effect is good.

The invention discloses a construction process of inner wall latex paint. The construction process comprises the following steps that S1, a concrete base layer is cleared; S2, gaps are filled, and local putty applying is conducted, specifically, the local gaps and the bumpy positions are leveled through putty, after being dried, the local putty is flat ground through abrasive paper, and floating dust is removed completely; S3, full putty applying is conducted, specifically, after being dried, fully-applied putty is flat ground through abrasive paper, and floating dust is removed completely; S4, priming paint sealing is conducted; S5, putty repairing is conducted, specifically, after priming paint is dried, the putty is repaired, after being dried, the repaired putty is flat ground throughabrasive paper, and floating dust is removed completely; and S6, finish paint is brushed, wherein the putty is prepared from the following raw material components in parts by weight: 180-220 parts ofwhite cement, 288-302 parts of coarse whiting powder, 235-262 parts of hollow glass micro-beads, 64-78 parts of carbon fiber, 5-8 parts of asbestos fiber, 32-46 parts of polyamide fiber, 14-23 parts of a coupling agent, 1-2 parts of polyvinyl alcohol and 15-22 parts of hydroxypropyl methyl cellulose. A constructed inner wall has good thermal insulation and noise reduction performance, and a latexpaint film is good in adhesion performance.

The invention provides a novel mineral material. The novel mineral material is prepared from the following raw materials in percentage by weight: 65-90% of stone, 0-5% of carbon fibers, 5-10% of ash powder and 5-20% of epoxy resin and a curing agent. The invention further provides a preparation method and application of the novel mineral material. The mineral material provided by the invention isgood in shock absorption, and particularly 10 times better than cast iron, and brings optimal vibration damping and noise reduction effects. The thermal stability is good, and the influence of temperature change on the dimensional precision of the machine tool hardly exists when the material is used for the numerical control machine tool, precision is high, a casting temperature is low, internal stress is avoided, the precision can be guaranteed, the integration is good, the novel mineral material can be directly injected into a pipeline, a cable, a sensor and the like, the corrosion resistance is good, good corrosion resistance is achieved on oil, cooling liquid and other corrosive liquid, energy is saved, environment is protected, energy consumption is low and is reduced by 80% comparedwith cast iron, and the material can be used as a regenerated material for secondary utilization.

The invention discloses a noise reduction type air outlet hood for an extractor hood. The noise reduction type air outlet hood comprises a base and a hood body on the base and is characterized in thatthe hood body comprises an inner hood and an outer hood, the peripheral wall of the inner hood is provided with multiple noise reduction holes and the inner hood and the outer hood form multiple noise reduction cavities corresponding to the noise reduction holes. The peripheral wall of the inner hood is provided with the multiple noise reduction holes, the inner hood and the outer hood form multiple noise reduction cavities corresponding to the noise reduction holes, air columns in the noise reduction holes and air in the noise reduction cavities form an elastic resonance system, when a partof the noise frequency of the extractor hood is the same to the inherent frequency of the resonance system, the air columns in the noise reduction holes produce resonance and violent friction with thehole walls and through the friction, the acoustic energy is converted into heat energy so that the noise elimination is realized. The noise reduction type air outlet hood has good noise reduction andelimination effects based on the Helmholtz resonance sound elimination principle. According to the diversion form of the air outlet hood, the noise reduction effects on all parts of the air outlet hood are optimal.

This invention relates to oil smoke draught compound noise elimination device, which is characterized by series locating oil smoke purifier, expanding noise elimination section and resistant elimination section from oil smoke entrance to the exit. The invention adopts the combination of the expanding and resistant noise elimination technique and uses the characteristics of high frequency property of resistant noise elimination device and the good property of the expanding noise elimination device in low and middle frequency to make the invention with good noise elimination property in low and middle and high frequency bands.

The invention relates to an audio noise reduction and audio noise reduction model processing method, device, equipment and medium. The method relates to the artificial intelligence technology, and the audio noise reduction model processing method comprises the steps: carrying out the feature coding of a real part sequence and an imaginary part sequence obtained after a sample audio signal is converted into a frequency domain signal through a real part processing network and an imaginary part processing network in a first sub-model based on a neural network, obtaining real part attention and imaginary part attention corresponding to the sample audio signal, and obtaining frequency domain coding features corresponding to the sample audio signal based on the real part sequence and the imaginary part sequence as well as the real part attention and the imaginary part attention; performing model training on the first sub-model according to a first loss determined based on a frequency domain coding feature and a frequency domain transformation sequence corresponding to the clean audio signal to obtain a frequency domain processing sub-model; and connecting and then jointly training the frequency domain processing sub-model and the time domain processing sub-model to obtain the audio noise reduction model, so that the noise reduction effect of the audio noise reduction model can be improved.

The invention discloses a compressor noise reduction device. The device comprises a sound-absorbing cotton and a hoop frame; the hoop frame is arranged on the outer side of a compressor shell, the sound-absorbing cotton wraps the outer side of the hoop frame, an air gap is arranged between the sound-absorbing cotton and the compressor body, the air gap is arranged between the sound-absorbing cotton and the compressor body, the phenomenon that the sound-absorbing cotton makes direct contact with the compressor shell, the sound-absorbing cotton is gradually aged and makes contact with the compressor shell, and abnormal sounds are generated is avoided, the service life of the sound-absorbing cotton is prolonged, the air gap between the hoop frame and the compressor body is beneficial to air flowing, the temperature of the compressor body wrapped by the sound-absorbing cotton can be effectively reduced, it is ensured that a compressor motor works at the normal temperature, the noise reduction effect of the sound-absorbing cotton can be ensured, and safety is improved.

The invention provides a fan volute with a noise reduction device and an assembly method thereof, relates to the technical field of fan structures, and aims at solving the problem that the noise absorbing effect of the noise reduction device is influenced due to more dust impurities accumulated on the surface of the noise reduction device after the noise reduction device in an existing fan is usedfor a long term. The fan volute structurally comprises a housing, the housing comprises two side walls which are mutually parallel and an annular wall which is arranged between the side walls and extends along the edge of the side wall, the housing is internally provided with the noise reduction device, the noise reduction device comprises a noise reduction layer which is arranged tightly closedto a ring-shaped wall and a plurality of blocking rods which are arranged perpendicular to the side wall, the baffle rods are arranged at intervals in the extension direction of the ring-shaped wall,the housing is divided into two parts in the direction parallel to the side wall, and the two parts are detachably connected. The assembly method of the fan volute comprises the steps that the ring-shaped wall is glued, the noise reduction layer is bonded, an inner component is installed, a sealing ring is bonded, and the side wall and the ring-shaped wall are connected through bolts. The fan volute has the advantages that the noise reduction layer is conveniently replaced, and a better noise reduction effect can be maintained.

The invention discloses a modular noise reduction installation design structure of a large-span curved surface stainless steel ceiling, and belongs to the technical field of building decoration. The modular noise reduction installation design structure comprises a plurality of first keels, a plurality of second keels, an arc-shaped ceiling plate, a sound insulation mechanism and a sound absorption adjusting mechanism, wherein the first keels are arranged in parallel, the first keels are hung on a top wall base layer through a plurality of first hanging rods, the second keels are arranged in parallel, the second keels are fixedly connected to the bottoms of the first keels, and the second keels are perpendicular to the first keels. According to the modular noise reduction installation design structure, a plurality of V-shaped gypsum boards are hung on the second keels, so that a plurality of small spaces are divided between the arc-shaped ceiling plate and the top wall base layer; and a plurality of sound absorption grooves are formed in the top of the arc-shaped ceiling plate, the noise reduction effect is good, modular clamping installation of the ceiling is realized, so that the tedious operation of bonding the stainless steel ceiling plate on a wood base layer is avoided, the construction is simple and convenient, the construction efficiency is high, and time and labor are saved.

The invention provides a neck-line bluetooth earphone and an application method thereof, wherein the neck-line bluetooth earphone comprises two earphone shells and an earphone wire used for being connected with the two earphone shells; a microphone array is arranged on one of the earphone shells; the neck-line bluetooth earphone further comprises a noise detection sensor arranged on the two earphone shells or the earphone wires, and the noise detection sensor is used for detecting the noise of the environment where the neck-line bluetooth earphone is located; a metal tube is arranged on the earphone wire in a sleeved mode, and the metal tube is used for fixing the shape of the earphone wire. By means of the earphone and the method in the invention, the problem that the noise reduction effect is poor due to the fact that the microphone of the existing bluetooth earphone is far away from the sound source can be solved.

The invention discloses a bladeless fan. The bladeless fan comprises a seat, a base and a nozzle on the base, wherein the nozzle is flat and slender, and is gradually reduced from the bottom up, the shell of the nozzle is divided into a left side, a right side, a front end and a rear end, the areas of the left side and the right side are large, the areas of the front end and the rear end are small, the rear end of the shell of the nozzle is close, and the front end is provided with a slot-like air outlet, which is used for receiving and jetting airflow; and the interior of the nozzle comprises a gradually reduced air passage and noise-reducing boards arranged on both sides of the air passage. The bladeless fan provided by the invention ensures that the wind flowing into the gradually reduced air passage from a wind guide cover in the spherical base can flow through the noise-reducing boards and that the resonance generated by the wind flow flowing through small holes is utilized to achieve a good noise-reducing effect. Consequently, the transmission loss of noise in the nozzle is increased, the outward transmission of the noise in the nozzle is inhibited, and the noise outside the fan is decreased; and moreover, the noise-reducing boards are convenient to machine and easy to mount, and only has little resistance to wind.

The invention relates to a noise control method, in particular to a ball mill acoustic hood noise control method. The ball mill acoustic hood noise control method includes: performing ball mill noise characteristic analysis by taking a motor and a speed reducer of the ball mill as objects, establishing an acoustic hood finite element model by ANASYS finite element software, analyzing to adopt an acoustic hood of a broadband composite acoustic absorption structure for denoising, mounting the closed acoustic hood on the motor of the ball mill, optimizing the shape of the acoustic hood, and subjecting the acoustic hood to finite element analysis and calculation so as to achieve noise control of a ball mill house, wherein when the acoustic hood is mounted, a distance is reserved between the inner wall of the acoustic hood and the motor to decrease coupling resonance generation possibility, and vibration isolation treatment is performed among the acoustic hood, the motor and a motor base to change rigid connection into elastic connection. The ball mill acoustic hood noise control method has the advantages that the ball mill acoustic hood of the improved broadband composite acoustic absorption structure is remarkable in acoustic insulation effect, and denoising performance of the acoustic hood is improved.

The invention discloses a novel ultra-strong noise reduction hearing aid voice processing system which comprises a microphone, a digital voice recognition unit, a digital voice synthesis unit, a hearing aid special DSP processing unit and a receiver. The digital technology is utilized to decompose, remodel and reconstruct the voice signal, the accuracy and high definition of the signal transmission content are ensured, the receiving and understanding during voice communication are facilitated, especially in a noisy human voice environment, the signal-to-noise ratio of a human voice signal which is wanted to be heard by hearing-impaired people can reach or exceed the level of a current high-end digital hearing aid, and the user experience is improved. Therefore, a patient with hearing loss can easily hear and clearly hear voice information of others, and an excellent noise reduction effect is achieved in a complex environment. And meanwhile, in a voice synthesis link, the voiceprint characteristics of the original input voice main signal are grabbed, and the output voice with the same voiceprint characteristics as the original input voice main signal is generated, so that the higher voice recognition requirement of the hearing loss patient is met.

The invention discloses an air suction silencer for a reciprocating compressor, and the reciprocating compressor with the air suction silencer. The air suction silencer for the reciprocating compressor comprises a lower shell, an upper shell and a coiled pipe assembly, wherein the lower shell is provided with an air suction pipe; the upper shell is arranged on the lower shell in a covering way; the upper shell and the lower shell are matched to define a holding space; the coiled pipe assembly is arranged in the holding space and divides the holding space into a first silencing chamber and a second silencing chamber; a first silencing expansion hole communicating with the first silencing chamber is formed in a part, located in the first silencing chamber, of the coiled pipe assembly; a second silencing expansion hole communicating with an inner cavity of the coiled pipe assembly is formed in a part, located in the second silencing chamber, of the coiled pipe assembly; the upper shell comprises an upper outer shell and an upper inner shell; the upper outer shell and the upper inner shell are connected through an upper connecting piece; the lower shell comprises a lower outer shell and a lower inner shell; and the lower outer shell and the lower inner shell are connected through a lower connecting piece. According to the air suction silencer for the reciprocating compressor provided by the invention, the upper shell and the lower shell are arranged to be of a double-layer structure, so that a better noise reduction effect can be favorably achieved.