67results about How to "Realize the noise reduction function" patented technology

The invention relates to the field of voice technologies, in particular to a self-adaptive denoising method based on sub-band noise analysis. The method includes the steps that firstly, framing and short time frequency domain transformation are conducted on input time domain audio signals with noise, and then frequency domain audio signals with noise are generated; secondly, a noise energy spectrum of the frequency domain audio signals with noise is estimated through a minimum value tracking method; thirdly, the posterior signal to noise ratio and the prior signal to noise ratio of the noise energy spectrum are calculated; fourthly, through a nonlinear gain extension method, denoising gains of all time frequency units are calculated through the posterior signal to noise ratio and the prior signal to noise ratio; fifthly, smoothing filtering is conducted on the denoising gains of all the time frequency units to reduce tone quality distortion; sixthly, the denoising gains act on all the time frequency units of the audio signals with noise in the first step, and then denoised frequency domain audio signals are acquired; seventhly, short time frequency domain inverse transformation is conducted, and then the final denoised time frequency audio signals are acquired and output. According to the method and system, stable noise in target signals can be greatly lowered.

The invention discloses a washing machine silencing method and a washing machine. The method includes the steps that noise generated in the work process of the washing machine is tested, and a noise frequency spectrum curve is generated; according to the noise frequency spectrum curve, the frequency large in noise contribution value is determined; according to the frequency large in noise contribution value, a silencing tube is determined; the silencing tube is installed in the washing machine to absorb the noise at the frequency. The silencing tube is added into the washing machine, the noise of the whole washing machine is lowered in the mode that the silencing tube absorbs part of system noise generated during operation of the washing machine, and the use experience of a user is improved. Compared with the design scheme that vibration of the washing machine is inhibited to lower the noise of the whole machine, the structure is simpler, the practicality is higher, an existing structure of the washing machine does not need to be changed, the existing washing machine can be conveniently improved, and the noise reduction function of the washing machine is achieved.

The invention belongs to the technical field of chemical environmental protection and provides a calcium carbide furnace tail gas recycling device. A tail gas outlet of a calcium carbide furnace is sequentially communicated with an induced draft fan, a silencing type environment-friendly canister, a cyclone separator, a spray washing tower, a gas compressor and a synthetic reactor; an upper partition board and a lower partition board which divide the inside cavity of the silencing type environment-friendly canister into an absorbing chamber, a noise reduction chamber and a cooling chamber are arranged in the silencing type environment-friendly canister, a plurality of first silencing holes are formed in the upper partition board and the lower partition board, an absorbing liquid is accommodated in the absorbing chamber, at least two silencing pipes communicated with the absorbing chamber and the cooling chamber are arranged in the noise reduction chamber, a heat exchange pipe is arranged in the cooling chamber, a gas inlet communicated with the absorbing chamber is formed in the bottom of the silencing type environment-friendly canister, and a gas outlet communicated with the cooling chamber is formed in the top of the silencing type environment-friendly canister; a sodium bicarbonate water solution is accommodated in the synthetic reactor. Recycling of calcium carbide furnace tail gas is realized, resource waste is avoided, pollution to the environment is avoided, and damage to body health is avoided.

The invention discloses a miniature snapshot spectrometer. The spectrometer comprises an angle filter, a spectrum selection layer, a photosensitive surface and a reading circuit which are sequentially arranged from top to bottom. According to the invention, a wide-spectrum-angle filtering function is realized by using the high-aspect-ratio diaphragm array, and a micro-nano structure or band gap and refractive index adjustable thin film is constructed to realize specific spectrum transmission in the same plane. The light-sensitive surface is used for converting transmitted light of different spectrum selection layers into light current signals, and the light current signals collected by the light-sensitive surface are processed and output through a reading circuit or an external processing circuit. According to the invention, an ultra-small-size snapshot spectrograph can be realized, so that high-precision and large-spectral-range spectral analysis is realized, and the device can be suitable for various wavebands, so that different spectral analysis requirements are met.

The invention discloses a noise reducing filter and an air conditioner and relates to the technical field of air conditioning system pipeline filtering and noise reducing. The filter can achieve a noise reducing function, and the circulation amount of fluid in the filter cannot be reduced. The noise reducing filter comprises a pipe and a filter screen located in the pipe. A spiral noise reducing device is arranged in the filter screen, and the length direction of the spiral noise reducing device is consistent with the main flowing direction of the fluid in the pipe. The noise reducing filter can be applied to air conditioning systems.

The invention relates to the technical field of intelligent sliding rail screens, in particular to an intelligent sliding rail screen based on voice control. The intelligent sliding rail screen comprises a lifting assembly, a back plate, a moving assembly, a mounting frame and a connecting plate. The intelligent sliding rail screen is characterized in that the display range of a display screen is larger by adjusting the position of the display screen left and right, so that the display effect of the sliding rail screen is further improved; the display screen slides and is matched with the back plate, so that the dynamic and static combination effect is achieved, and the demonstration effect of the sliding rail screen is further improved; a second sliding block is used for being in sliding fit with a second sliding rail, so that sliding of the display screen is smoother; a transmission lead screw and a driven lead screw are used, so that the display screen can move more accurately and slide more stably, and the accuracy of control management of the sliding rail screen is improved; and the display screen can be pulled out by pulling the mounting frame, and convenience is provided for replacement and maintenance of the display screen.

The invention discloses a wireless ultraviolet light scattering channel estimation method based on deep learning, and the method comprises the specific steps: firstly carrying out the modeling of a wireless ultraviolet light non-direct-view single scattering channel, calculating the related channel parameters of channel response and the like, and then carrying out the offline deep neural network training through a large amount of offline channel training data, calculating a mapping relationship between the received data and the channel response according to a training result, finally performing channel estimation by using the trained deep neural network, sending the trained channel parameters to a receiving end, inputting the received data into the deep neural network, and outputting the optimal channel response, thereby realizing channel estimation. According to the method, the problems of high bit error rate, poor robustness, requirement on prior channel characteristics and the likein a traditional channel estimation algorithm are solved, deep learning and wireless ultraviolet light communication are combined, the transceiving accuracy and reliability of a communication system are improved, and a theoretical basis is provided for further application of deep learning to optical communication.

The invention discloses a narrow vehicle linear sorting machine which comprises a rack, a driving mechanism, a bearing assembly, a conveying trolley and a detection coding assembly, the bearing assembly is slidably installed on the rack, the driving mechanism is arranged on the conveying trolley, the conveying trolley is installed on the bearing assembly, the driving mechanism comprises a chain, and the chain is arranged on the conveying trolley. The bearing assembly is connected to the chain, the bearing assembly comprises a walking wheel, a guide wheel and a wheel carrier, the wheel carrier is connected to the chain, the guide wheel is installed on the wheel carrier in a rolling mode, the walking wheel is also arranged on the wheel carrier, and the detecting and coding assembly is arranged above the conveying trolley. According to the narrow vehicle linear sorting machine, double chains are adopted for synchronous driving, the abrasion degree of the chains is reduced, and therefore the noise reduction function is achieved; the operation method of the narrow vehicle linear sorting machine is suitable for sorting parcels of different specifications, long and large parcels can also be sorted, the applicability of equipment is enhanced, and the use cost of the equipment is reduced.

The invention relates to a polyurethane elastomer phononic crystal noise-reducing film and a preparation method thereof. The noise reducing film comprises at least four periodic components, each periodic component is composed of one polyurethane layer and one vibrator layer, wherein each vibrator layer is formed by coating a large amount of microbead vibrators by a polymer, and each microbead vibrator is formed by coating each metal microbead by a layer of soft elastomer; and the preparation method comprises the following steps: the microbead vibrators formed by coating the metal microbeads bythe soft elastomers and polymer pellets are uniformly mixed, the mixed material is subjected to melt extrusion by one extrusion unit, the polyurethane raw material is subjected to melt extrusion by another extrusion unit, the extrudate enters a confluence unit, the confluent material sequentially passes through m lamination units, partition, torsion and lamination are performed for n times in n torsion flow channels in each lamination unit to form the phononic crystals in which the vibrator layers and the polyurethane layers are alternately arranged. The preparation process of the noise reducing film provided by the invention is very simple, the production efficiency is high, large-scale production is easy to realize, and the noise reducing film has strong applicability, and can cover thesurface of a large target to realize a noise reducing function.

The invention relates to an aluminum product machining center with a noise reduction function. The aluminum product machining center comprises a workbench, a base, a top plate, an air cylinder, a supporting plate, a motor, a drilling rod, two supporting rods, a cleaning mechanism and a noise reduction mechanism, wherein the noise reduction mechanism comprises a noise absorption plate, a baffle andtwo driving assemblies; each driving assembly comprises a fixing rod, a driving box, an air inlet pipe, an air outlet pipe, an electromagnet, a driving plate, a spring and a driving rod; the cleaningmechanism comprises a fixing box, a filter screen and two air inflation assemblies; each air inflation assembly comprises an air inflator, a piston, a power unit, a first connecting pipe, a second connecting pipe and a plurality of elastic ropes; and each power unit comprises a blade, a rotating shaft, a rotating disc, a first bearing, a protruding point and a pulling rope. According to the aluminum product machining center with the noise reduction function, the purpose of reducing the noise is achieved through the noise reduction mechanism; the harm to the hearing health of the user caused by excessive noise is avoided; the function of cleaning the drilling rod is achieved through the cleaning mechanism; and the situation that chippings adhere to the drilling rod and cause influence on the machining work is avoided.

Disclosed is motor magnetic steel. The motor magnetic steel is characterized in that the two ends of an outer arc surface of a magnet steel main body are provided with arc surfaces which transit withthe outer arc surface in an arc manner, gaps exist between the arc surfaces and extending lines of the outer arc surface, the gaps are air gaps, the arc surfaces are air gap transition arcs, the totalwidth of the air gaps is 1/3-1/2 of the total width of the magnetic steel, the vertical distance between an outer arc extending surface of the main body and the outer end of each air gap transition arc is 0.3-0.5 mm, the two ends of an inner arc surface of the magnetic steel main body are provided with platforms, the total projection length of the platforms is 1/4-1/2 of the total width of the magnetic steel, and angles between the platforms and inner arc chords form platform air gap angles which are 5 degrees to 15 degrees. The motor magnetic steel reduces the motor noise and improves the magnetic energy utilization rate.

The invention discloses a microphone circuit and an earphone with a noise reduction function. The microphone circuit comprises: a microphone branch, connected to a microphone transducer which is connected to an input voltage terminal and a ground terminal; a fixed current branch, connected in parallel to the microphone branch, comprising a digital signal processor which is connected to a signal output end of the microphone transducer; and a power manager, connected to the input voltage terminal and the digital signal processor, further comprising a current monitoring module for compensating the total current of the fixed current branch to be stable. The microphone circuit has the advantages: output signals of the microphone transducer are processed by adopting the digital signal processor,and the signals within a set band range are strengthened to suppress the signals of other bands, thereby realizing the noise reduction function; and the power manager reduces the input voltage for providing constant current for the digital signal processor, and is provided with the current monitoring module for compensating the current difference in real time to keep the total current stable.

The invention provides a load shedding sound barrier unit and a sound barrier thereof. The load shedding sound absorption screen body comprises at least one load shedding unit structure arranged in the vertical direction, and an upper screen body and a lower screen body which are adjacent to the load shedding unit structure. The load shedding unit structure comprises a left screen body, a right screen body and a load shedding structure located between the left screen body and the right screen body. The load shedding structure comprises a rotating wheel and an outer cylinder. The rotating wheel comprises a rotating shaft and at least three impellers, the two ends of the rotating shaft are connected with the left screen body and the right screen body respectively and can rotate freely, and the impellers are evenly arranged on the rotating shaft in a surrounding mode. The outer cylinder is fixed to the upper screen body and the lower screen body which are adjacent to the outer cylinder, each screen body is provided with an arc-shaped attaching face matched with the outer cylinder, and the gap between the outer end of the impeller and the inner side of the outer cylinder is not larger than 2 mm. The connecting surfaces of the upper and lower adjacent screen bodies are bent arc-shaped binding surfaces; the diameter of the outer cylinder is at least 200 mm, and the outer cylinder is provided with an end air opening and a surface air opening. After wind pressure acts on the two-end tuyeres and the surface tuyeres, the impeller is pushed to rotate around the rotating shaft, the pressure is converted, and the wind load is effectively reduced.

The invention discloses a bamboo floor convenient to splice. The bamboo floor convenient to splice includes bamboo foundation plates, muting effect layers, a PVC sound-proof block, a damping layer anda damping small spring. The damping layer is installed at the central position of the inner portion of the bamboo foundation plates. The muting effect layers are arranged in the bamboo foundation plates of the two ends of the damping layer. Damp proof and anti-bacteria layers are fixedly arranged on one ends, far from the damping layer, of the muting effect layers. The insect-proofing layers arefixedly arranged in the bamboo foundation plates far from one end of the damp proof and anti-bacteria layers. Sealing bamboo plates are arranged at the top end of the bamboo foundation plates, far away one side of the damp proof and anti-bacteria layers, of the insect-proofing layers. A splicing groove is formed in the central position, far from the outside wall of a splicing bump, of the bamboo foundation plates, bamboo stop blocks are fixedly arranged on the outside wall of the bamboo foundation plates of the two ends of the splicing groove. The bamboo floor convenient to splice not only improves the using comfort of the bamboo floor, and avoids the noise pollution, but also prolongs the service life of the bamboo floor.

The invention relates to stirring equipment with a noise reduction function for a coal chemical industry. The equipment comprises a body, a connecting cover, a driving motor, a transmission shaft, a bottom plate, two fixing blocks and at least one first stirring rods, the bottom plate is horizontally arranged under the body, the driving motor is fixed to the top of the bottom plate, the transmission shaft is vertically arranged, the driving motor is in transmission connection with the bottom of the transmission shaft, the bottom of the body sleeves the transmission shaft, two fixing blocks arearranged on both sides of the driving motor respectively, the top of the bottom plate is fixedly connected with the bottom of the body through the fixing blocks, the first stirring rods are uniformlyfixed to the two sides of the transmission shaft from top to bottom, the connecting cover horizontally covers the top of the body, the bottom plate is provided with a noise reduction mechanism, and an auxiliary mechanism is arranged in the body. The equipment has the advantages that the function of noise reduction is achieved through the noise reduction mechanism, the stirring effect is improvedthrough the auxiliary mechanism.