118results about How to "Guaranteed Noise Cancellation Performance" patented technology

The invention provides an adaptive collection empirical mode decomposition based electrocardiosignal characteristic point identification method. The method comprises the steps that two parameters of Ratio and NEEMD combining empirical mode decomposition are calculated adaptively according to the self characteristics of to-be-identified electrocardiosignal, AEEMD noise-reduction processing is conducted on the to-be-identified electrocardiosignal according to the determined parameters, an electrocardiogram noise-reduction signal is obtained, AEEMD noise-reduction processing and characteristic point identification of the electrocardiosignal are combined, hierarchies large in QRS waveform energy ratio are extracted from intrinsic mode function components of all hierarchies obtained in the AEEMD noise-reduction process are overlapped to serve as a detection layer, after difference operation is conducted, an adaptive section division mode is adopted for conducting section processing, electrocardiogram difference section signals are obtained, and finally, by combining the electrocardiogram noise-reduction signal with the electrocardiogram difference section signals, positioning identification of QRS waves in the to-be-identified electrocardiosignal is achieved according to distances between all the characteristic points in the electrocardiosignal and a waveform slope relation; the amount of computation can be subjected to optimal identification, the identification efficiency is improved, and the identification accuracy is improved.

The invention relates to a light-weight steel structure house and a construction method thereof. The light-weight steel structure house comprises a house frame, double-layer outer wall plates, inner wall plates and lightweight floor plates. The house frame comprises a foundation, supporting upright columns, truss beams and cross sleeve connecting pieces; the supporting upright columns comprise four corner supporting upright columns, a plurality of outer supporting upright columns and a plurality of inner supporting upright columns; each supporting upright column is of an I-shaped steel structure; and the supporting upright columns are mounted on the foundation in mutually-parallel mode. The double-layer outer wall plates are arranged between every two adjacent outer supporting upright columns or between the adjacent corner supporting upright columns and the outer supporting upright columns. The inner wall plates are arranged between every two adjacent inner supporting upright columns or between the adjacent inner supporting upright columns and the outer supporting upright columns. The lightweight floor plates are parallelly arranged between every two adjacent truss beams. The light-weight steel structure house and the construction method thereof have the advantages that by means of the house frame, the double-layer outer wall plates, the inner wall plates and the lightweight floor plates and adjustment of connection of all the structures, the house is convenient for correction, effective heat dissipation and noise reduction are achieved, and meanwhile the overall strength of the house is guaranteed.

The application provides a night scene image processing method and device, an electronic device and a storage medium, belonging to the technical field of imaging. The night scene image processing method comprises the following steps: collecting multiple frames of images in sequence according to a preset exposure compensation mode; using a preset image recognition model to perform recognition processing on a preset frame of image in the multiple frames of images, so as to determine a target area and a non-target area in the preset frame of image; and using different noise reduction parameter values to perform noise reduction on the target areas and the non-target areas of the multiple frames of images, so as to generate a target image, wherein the value of the noise reduction parameter corresponding to the target area is greater than the value of the noise reduction parameter corresponding to the non-target area. Through the night scene image processing method, the overall noise reduction effect of the image and the purity degree of the target area are ensured, and the details of the non-target area are better preserved; therefore, the quality of the captured image is improved, andthe user experience is improved.

The invention discloses a data noise reduction method of motion capture. The method comprises the following steps: collecting two frames or more motion graphic data of a plurality of mark points and tracing movement tracks formed by the mark points in each frame according to collected motion graphic data; fitting the movement tracks of the mark points by using low-order B-spline Curves respectively so as to generate a plurality of approximation curves which are one-to-one corresponding to the movement tracks of the mark points. The approximation curves are the movement tracks of noise reduced movement tracks of the mark points. Through using the data noise reduction method of motion capture provided by an embodiment of the invention, detail data information of movement tracks of the mark points is maintained when capturing face expression movements. Therefore, the system has the characteristic of good real-time property.

The invention discloses a noise reduction earphone configuration method and device, an intelligent terminal and a noise reduction earphone. The method comprises the following steps: receiving a configuration instruction; displaying the multiple groups of noise reduction configuration information to a user according to the configuration instruction; and receiving a selection instruction of a user for the noise reduction configuration information, and sending the noise reduction configuration information corresponding to the selection instruction to the noise reduction earphone in a wireless mode, so that the noise reduction earphone performs active noise reduction according to the noise reduction parameter corresponding to the noise reduction configuration information. According to the invention, after the wireless earphone is assembled into a complete machine, the noise reduction curve parameters of the wireless earphone can be configured in a wireless mode, and the noise reduction performance of the earphone is ensured. Moreover, multiple groups of noise reduction parameters are provided for different users to select according to actual use conditions, so that the user experienceis enhanced.

The invention provides an electric kettle which comprises an inner container, a noise reduction layer, a heat conduction plate and a heating device; the inner container comprises a bottom plate and side enclosing plates; the bottom plate is connected with the side enclosing plates to form an accommodating cavity for accommodating liquid; the noise reduction layer is arranged on the bottom plate and is positioned in the accommodating cavity, and the upper surface of the noise reduction layer is uneven microscopically; the heat conduction plate is arranged under the bottom plate; the heating device is arranged on the heat conduction plate; when the electric kettle heats the liquid, the upper surface of the noise reduction layer is uneven to accelerate the generation and the aggregation of air bubbles. The electric kettle provided by the invention has the benefits that through the noise reduction layer, different areas on the bottom plate are uniformly heated, so that the rate when the air bubbles are separated from the noise reduction layer is reduced; meanwhile, the generation and the aggregation of the air bubbles are accelerated, so that the plurality of small air bubbles are aggregated into big air bubbles, the problem of large noise caused by implosion, namely disappearance after a large amount of single small air bubbles is changed into the big air bubbles in the rising process is solved, ,the noise generated when the electric kettle heats the liquid is reduced, and the use conform of the product is improved.

The invention relates to a rubbing sound emission signal denoising method based on discrete fraction cosine transform. The invention comprises the technical proposal that: a sound emission signal is extracted from an emission sensor of a friction point and superimposed with noise; the signal comprising noise is sampled, quantized and subframed and added with windows to obtain a discrete time sequence; the sequence is carried out discrete fraction Fourier transform with the fraction a to obtain F(k), then the signal after being filtered is carried out the discrete fraction Fourier transform with the fraction 2-a and the combination of frames; the signal after being denoised is output. The rubbing sound emission signal denoising method solves the disadvantages that a sound emission source has diversity, transient property and a noise source has complexity and can not gain satisfactory effect. The rubbing sound emission signal denoising method can obtain good denoising effect to the rubbing sound emission signal under the environment of a plurality of nonstationary noise, strengthen the sound emission signal, has robustness to the diversity and transient property of the sound emission source and the complexity of the noise source, effectively solves the problem of the large calculation amount in the prior method and has wide applicability.

The invention provides a noise reduction structure and a range hood. The noise reduction structure comprises a front plate, a sound absorption part and a rear plate, wherein the sound absorption partis arranged opposite to the front plate; the rear plate is connected with the front plate to form a containing cavity, the containing cavity is suitable for containing the sound absorption part, and at least one of the front plate and the rear plate is provided with a plurality of connecting parts in a protruding mode in the direction back on to the other one of the front plate and the rear plate.Through the built-in sound absorption part, noise from the direct-facing direction of the front plate or the rear plate is blocked, the noise reduction structure can be arranged at the position of anair inlet of the range hood, airflow impact sound and other noise transmitted from the air inlet are effectively weakened, in addition, the protruding connecting parts ensure that a gap exists between the noise reduction structure and the air inlet, lampblack can smoothly enter the air inlet, the noise reduction structure is easy to install and low in cost, the defects that in the prior art, a noise reduction structure of a range hood is complex in design and high in noise reduction cost are overcome while noise is reduced, and the life quality of a user is improved.

The invention discloses a train damping wheel which comprises a center plate (1), a rim (2) and a hub (3). The train damping wheel is structurally characterized in that circular-ring-shaped inner metal plates (4), sticking elastic damping layers (5) and outer metal plates (6) are sequentially fixed to the two sides of the center plate (1) from inside to outside through a bolt (7). The ring width of the circular-ring-shaped inner metal plates (4), the ring width of the sticking elastic damping layers (5) and the ring width of the outer metal plates (6) are the same, and the inner circumferential faces and the outer circumferential faces of circular rings are not in contact with the wheel. According to the train damping wheel, the vibration of the wheel can be relieved, noise generation is inhibited, noise spreading is inhibited, the noise reduction effect is good, installation is easy, the shape of a wheel body is not changed, and application and popularization are easy.

The invention relates to a method for earphone noise reduction and a noise reduction earphone. The earphone comprises a sensor and a filter assembly, and the method comprises the steps: detecting thecurrent capacitance of a human ear through the sensor; determining a current noise reduction parameter on the basis of the current capacitance, referring to N groups of corresponding relationships between preset capacitance of the human ear wearing the earphone and preset noise reduction parameters, N being a positive integer, and the noise reduction parameter comprising a filter coefficient of afilter enabled in the filter assembly; and configuring the filter assembly according to the current noise reduction parameter to reduce noise. According to the invention, the capacitance value at thecorresponding position of the human ear is detected through the sensor configured on the earphone, and the noise reduction parameter of the filter assembly in the earphone is further determined basedon the capacitance value; therefore, dynamic adjustment of the noise reduction parameters of the earphone can be conveniently and quickly realized, the noise reduction effect in different use scenes is ensured, the calculation load of the system is reduced, and the listening experience of a user is improved.

The invention discloses a shift register unit and a driving method thereof and a gate driving circuit, which relate to the technical field of display and aim at solving the problems that the existingshift register unit is likely to meet electric leakage increase and lose noise reduction capability in a retaining time period. The shift register unit comprises a pull-up node control module, a pull-down node control module, a capacitor module, an output module and a noise reduction adjustment module, wherein the noise reduction adjustment module is connected with a pull-down node and a first level input terminal respectively; and the noise reduction adjustment module is used for controlling to reduce the rising rate of potential of the pull-down node in a noise reduction time period in the retaining time period and controlling to reduce the falling rate of potential of the pull-down node in a non-noise reduction time period in the retaining time period. The shift register unit provided in the invention is used for providing gate driving signals.

The embodiment of the invention discloses a method and device for adjusting a noise reduction model of audio equipment. The method comprises the steps: acquiring to-be-tested audio collected by target audio equipment; determining feature information of the to-be-tested audio; adjusting parameters of an audio noise reduction model based on the feature information; and in response to the received user voice signal collected by the target audio device, performing noise reduction on the user voice signal by using the audio noise reduction model after parameter adjustment. According to the embodiment of the invention, the use environment, use habits and other characteristics of the to-be-tested audio recognition user are integrated, the parameters of the audio noise reduction model are dynamically adjusted for different characteristics, and the calculation amount of the model is dynamically controlled on the basis of ensuring the noise reduction performance, so that the consumption of a CPU is reduced, and the power consumption is reduced.

The invention discloses a headset capable of improving the low-frequency sound insulation performance. The headset comprises an earmuff shell forming an earmuff cavity, a loudspeaker located in the earmuff cavity and a guide tube with two ends open; and one end of the guide tube stretches into the loudspeaker and is located under a diaphragm of the loudspeaker, and the other end of the guide tubepenetrates through the earmuff shell to be communicated with the outside. According to the headset, by adopting the mode of installing the guide tube on the earmuff shell and stretching the guide tubeinto the position under the diaphragm of the loudspeaker, the corner frequency of a low pass filter formed by an earmuff is reduced, and then the condition that outside noise in more frequency bandspenetrates through the earmuff shell to enter the earmuff cavity can be prevented to improve the low-frequency noise insulation performance of the headset product; and meanwhile, by stretching the guide tube out to the outer side of the earmuff shell, sound holes do not need to be formed in the earmuff shell, not only can the audio output requirement of the loudspeaker be met, but also the condition that the outside noise passes through the sound holes to enter a back cavity of the loudspeaker can be prevented, therefore, the sound insulation and noise reduction capacity of the headset is further improved, and the audio rendering quality of the headset is improved.

The invention discloses a parameter design method of a tire cavity resonance noise attenuation device. According to the parameter design method, porous materials used by the tire cavity resonance noise attenuation device are equivalent to fluid meeting a Delany-Bazley theoretical model, a characteristic equation of sound pressure in a tire cavity is calculate according to boundary conditions existing in the tire cavity, cavity resonance frequency and a characteristic value corresponding to the cavity resonance frequency are acquired according to the characteristic equation of the sound pressure, and the thickness and the flow resistance rate of the porous materials are designed. According to the method, parameter selection and design of the noise attenuation device is more optimized when tire cavity resonance noise is effectively reduced, and bases are provided for material parameter design of the tire cavity resonance noise attenuation device.

Disclosed are an exhaust system and a control method for reducing the exhaust back pressure. The exhaust system comprises an exhaust manifold, a front muffler, a first rear muffler, a second rear muffler, an exhaust back pressure sensor and a controller; the first rear muffler and the second rear muffler are arranged in a parallel mode; a controllable valve which is used for adjusting the exhaust flow rate is arranged at the air inlet end of the second rear muffler; the exhaust back pressure sensor is located at the front end of the exhaust manifold and used for measuring the exhaust back pressure of an engine; the controller is in communication connection with a vehicle engine rotational speed signal sensor, the exhaust back pressure sensor and the controllable valve and used for performing real-time collection and processing on rotational speed signals of the engine and pressure signals of the exhaust back pressure so as to adjust the opening of the controllable valve. When the engine runs at the low speed, the noise reduction effect of the vehicle exhaust system is not affected. When the engine runs at the high speed and the exhaust back pressure exceeds a certain calibration threshold value, the controllable valve is driven by the controller to be opened, part of exhaust can be discharged out of the second rear muffler, and accordingly the exhaust back pressure can be stabilized within a certain calibration threshold value.

The invention relates to the technical field of active noise control, and particularly relates to a disturbance observation method based power transformer active noise control system. The power transformer active noise control system comprises a primary sensor array, a preamplifier I, an error sensor array, a preamplifier II, a power amplifier, an industrial control computer, a PCI data acquisition card, a PCI data output card, a visual disturbance observation control module and a secondary sound source array, wherein the primary sensor array and the error array are connected to the PCI data acquisition card respectively through the preamplifier I and the preamplifier II, the PCI data acquisition card is connected to the PCI data output card through the industrial control computer, and the PCI data output card is connected to the secondary sound source array through the power amplifier; and the industrial control computer serves as a carrier of the PCI data acquisition card, the PCI data output card and the visual disturbance observation control module. The power transformer active noise control system track noise signals in real time through a disturbance observation control algorithm, and realizes effective noise reduction after being put into an actual transformer station.

The invention discloses a noise-absorbing device for eliminating tunnel noise. The noise-absorbing device comprises a noise-absorbing partition board and noise-eliminating spheres, wherein the noise-absorbing partition board is provided with a plurality of noise-absorbing through holes, and the noise-eliminating spheres are arranged on one of the side surfaces of the noise-absorbing partition board and correspond to the noise-absorbing through holes one by one separately; the noise-eliminating spheres comprise supporting shells and hollow rubber spheres, wherein the supporting shells are spherical, the hollow rubber spheres are positioned in the supporting shells, and the outer surfaces of the hollow rubber spheres and the inner surfaces of the supporting shells are bonded and fixed; a plurality of rubber bulges uniformly distributed are arranged on the inner walls of the hollow rubber spheres; noise inlets are formed in the same position of the supporting shells and the hollow rubberspheres; and the noise inlets of each noise-eliminating sphere correspondingly and fixedly communicate with the corresponding noise-absorbing through holes through connecting assemblies. The noise generated in a tunnel can be effectively eliminated to ensure the noise reduction effect; and in addition, once the noise-absorbing device is partially damaged, the noise-absorbing device is not needed to be replaced integrally, and the repair of the noise-absorbing device can be completed only by replacing a damaged part.

The invention discloses a mixing ratio design method of a macroporous high-polymer mixture. The method includes grading design, determination of an adhesive use quantity range, specimen molding of themixture, a curing method, performance testing and determination of best adhesive use quantity, and is a method based on performance balancing and target porosity. The best adhesive use quantity rangeis selected through testing of performance indicators, then the target porosity is combined to determine the best adhesive use quantity, an effect that road use performance in road use meets requirements can be guaranteed, and water drainage and noise reduction performance of a macroporous road surface can also be guaranteed. Therefore, the method is a practical design method that can guarantee performance of all aspects of the mixture, and a design process of the method is simple and easy to operate.

The invention discloses an upright six-cylinder car engine exhaust pipe system, which comprises an exhaust manifold, exhaust pipes, a catalytic converter and a muffler. The exhaust manifold comprises a first exhaust manifold connected with the three exhaust pipes of an engine, and a second exhaust manifold connected with the other three exhaust passages of the engine. The exhaust pipe comprises a first exhaust branch pipe and a second exhaust pipe. One end of the second exhaust branch pipe is connected with the second exhaust manifold, and the other end of the second exhaust branch pipe is connected with the muffler. The exhaust system provided by the invention divides the six cylinder passages into two groups; three cylinder passages constitute one group, and are connected with one exhaust manifold, thus simplifying the design, improving the manufacturability, reducing the cost and improving the service life of the exhaust manifold. As the pipeline from the exhaust manifold to the catalytic converter is long, the uniformity of exhaust through the catalytic converter is improved, thus improving the exhaust gas purification efficiency.

Disclosed are an efficient-type corn niblet powder-making and caking-making system and a corn cake preparing method. The efficient-type corn niblet powder-making and caking-making system comprises a winnowing machine, a magnetic separator, a crushing and skinning machine, a crushing mechanism and a milling mechanism which are arranged in a treatment workshop, further comprises a batching tank anda puffing machine which are arranged in a puffing workshop, and further comprises a feeding channel and a finished product temporary storage tank. The feeding channel is formed in a downward-inclinedmode from the position, located on the outer side of the treatment workshop, of the ground, extends into the treatment workshop, and is connected with the bottom end of a first elevator in the treatment workshop. The refining effect is achieved through multi-link screening and then conveying and a multi-stage grinding and screening mechanism, so that feeding, powder-making, puffing and dischargingare conducted in different workshops, feeding and discharging are convenient to operate, the situation that operators are in the treatment workshop with loud noise is avoided, mutual interference ofpowder-making and puffing processes is avoided, noise reduction treatment is further conducted on key equipment, air pipes and an elevator channel, and the structure of the connecting position of theair pipes is improved to solve the situation of outage retention.

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 relates to a spray head water pressure control system which comprises a permanent magnet, concentration measuring equipment, an AT89C51 single chip microcomputer and a box body coil, wherein the permanent magnet is arranged above a detergent box of a box type bowl washing machine and used for attracting a metal box body provided for the detergent box onto an opening below the detergent box through magnetic force; the concentration measuring equipment is arranged in the box type bowl washing machine and used for measuring the detergent concentration of a water body in the box typebowl washing machine to send an insufficient concentration instruction or a sufficient concentration instruction; the AT89C51 single chip microcomputer is connected with the concentration measuring equipment and used for powering on the box body coil when the sufficient concentration instruction is received to generate the magnetic force to offset the magnetic force of the permanent magnet and release the metal box body from the opening below the detergent box; the box body coil is arranged inside the detergent box of the box type bowl washing machine and connected with the AT89C51 single chip microcomputer; the AT89C51 single chip microcomputer is also used for ending the power-on of the box body coil when a sufficient concentration signal is received. Through the spray head water pressure control system provided by the invention, the performance of the box type bowl washing machine can be improved.

The invention discloses a vehicle-mounted air inlet valve. The vehicle-mounted air inlet valve comprises an upper valve body and a lower valve body. The upper valve body is fixedly connected with thelower valve body. A valve cavity is cooperatively formed in the upper valve body and the lower valve body, an air inlet communicating with the valve cavity is formed in the upper valve body, an exhaust port communicating with the valve cavity is formed in the lower valve body, a valve element and a valve element spring are arranged in the valve cavity, one end of the valve element spring abuts against the lower valve body, and the other end of the valve element spring abuts against the valve element. The valve element abuts against the upper valve body under the effect of the valve element spring in order to block the portion between the air inlet and the valve cavity, multiple shunting blocks are arranged at the position, located on an air outlet, of the lower valve body, one ends of themultiple shunting blocks are evenly distributed along the circumference of the inner wall of the lower valve body, the other ends of the multiple shunting blocks are connected with the position of thecircle center of the inner wall of the lower valve body, and the shunting blocks and the lower valve body are of an integrally-formed structure. The upper valve body and the lower valve body are arranged, the effect of lowering noise can be achieved, and the shunting blocks and the lower valve body are of the integrally-formed structure, so that it is guaranteed that the shunting blocks are not separated from the lower valve body.

The invention belongs to the technical field of clothes dryers, and particularly relates to a household intelligent adjusting clothes dryer. The household intelligent adjusting clothes dryer comprisesa power module, a drying module and a controller. Due to the difference in height and usage habits among individual users, a clothes hanger descends to a fixed position, a user is required to adjustthe descending height position of the clothes hanger in each clothes drying process, the clothes dryer is driven by an alternating current motor through a relay, and the running time of the clothes dryer cannot be memorized. The clothes hanger is driven by a direct current motor, instead of the alternating current motor, to run, so that the speed control performance is better, and the clothes dryers is suitable for accurate control of the height of the clothes hanger; and after the controller monitors current time driven by the direct current motor and the clothes hanger is adjusted to suitable height for the user, the driving process of the direct current motor is recorded, operation of height adjustment of the clothes hanger in subsequent use is avoided, and the user experience of the household intelligent adjusting clothes dryer is improved.