20 results about "Noise strength" patented technology

The invention provides a wireless Mesh self-adaptive channel selection method and system, and relates to the technical field of channel selection and optimizing.The wireless Mesh self-adaptive channel selection method comprises the steps that firstly, according to a Mesh network topological structure, a data transmission path and a corresponding channel are marked, and performance parameters such as delay packet loss rate, transmission rate bandwidth signal intensity and noise intensity are collected at fixed time intervals; the method comprises the following steps: calculating a delay packet loss rate transmission rate by detecting a data packet, obtaining bandwidth signal intensity and noise intensity by means of a tool, then extracting the delay packet loss rate transmission rate and bandwidth data, constructing a channel quality model, identifying a service type by using a deep packet inspection engine nDPI, and dynamically adjusting a weight according to a bandwidth proportion. Meanwhile, a channel signal interference quantization model is constructed according to the signal intensity and the noise intensity, finally, a signal interference quantization threshold value is set, the channel meeting the condition is screened out, the channel with the maximum channel quality result is selected as the optimal channel and switched, and the reasonability and communication performance of wireless Mesh network channel selection are effectively improved.

The invention provides a compressor frequency mute adjusting method and system based on heating rate feedback. The method comprises the steps that a state input vector is constructed; a temperature difference target is calculated according to the current water inlet temperature of the target compressor, and whether the heating effect is effective or not after frequency change is recognized; through dynamic coupling of the noise intensity and the thermal path response impedance, a hearing feeling scoring model containing a frequency penalty term and a trend correction term is constructed, and a hearing feeling score and a hearing feeling risk increment are generated; performing weighted fusion on the thermal path response impedance and the hearing score to obtain a frequency modulation tendency score and a frequency adjustment instruction; and the frequency adjusting instruction is applied to actual equipment, and operation execution of variable-frequency adjustment and mute adjustment of the compressor is completed. The technical defect that in an existing method, the heating effectiveness and the noise comfort cannot be judged at the same time is overcome.

Methods and apparatus for temporally consistent video denoising directed at removing image noise. According to one example, a denoising algorithm uses a noise estimation block and an image denoising block operatively connected to one another. In various examples, the noise estimation block is implemented using a neural network or a filter arrangement including an entropy filter and is designed to analyze noisy frame sequences and generate a noise strength map. With this noise strength map, the image denoising block operates to perform the image denoising more efficiently, effectively reducing the image noise while preserving the texture of the original footage. In some examples, a joint loss objective is used to find configurations of both blocks that result in nearly optimal performance of the denoising algorithm.

The invention provides an air conditioner, a control method and device of the air conditioner, a storage medium and a computer program product. The method comprises the steps that original noise signals generated when the air conditioner operates are collected; the collected original noise signals are input into a pre-trained noise recognition model to generate noise reduction signals, the noise recognition model is a Swinin-Conv-UNet mixed model, and the noise reduction signals comprise noise source and / or type information and corresponding noise intensity information; according to the generated noise reduction signal, the current noise source and / or type and the corresponding noise intensity of the air conditioner are / is determined; according to the determined current noise source and / or type of the air conditioner and the corresponding noise intensity, a noise reduction control strategy of the air conditioner is obtained; and a corresponding control instruction is generated according to the obtained noise reduction control strategy, and the air conditioner is controlled to execute. According to the scheme, the air conditioner noise can be remarkably reduced.

The invention provides a trapped person position state analysis method and system, and relates to the field of data processing. According to the method, building structure distribution, conductive fluid flow channels and metal component distribution in a disaster target area are constructed to form a background entropy flow ground state, and noise intensity probability distribution, a channel joint fluctuation relation and a time stability index are counted to generate a background entropy flow field. In the search and rescue stage, a background entropy flow field is converted into a controlled mode through active disturbance, multi-physical channel noise responses before and after disturbance are collected through a multi-field passive sensor network, and a multi-dimensional local entropy response vector is constructed. And combining the consistency, directivity and duration of the multi-noise channel to identify an initial suspected region and extract an entropy anomaly core region, finally inferring metabolic activity and posture limitation conditions according to a local entropy response cooperative relationship in different disturbance modes, and outputting a position state result of the trapped person. By implementing the technical scheme provided by the invention, the position state of the trapped person can be accurately identified.

The present invention provides a wireless Mesh adaptive channel selection method and system, which relates to the field of channel selection and optimization technology. The present invention first marks the data transmission path and the corresponding channel based on the Mesh network topology, and collects performance parameters such as delay packet loss rate, transmission rate, bandwidth, signal strength, and noise strength at fixed time intervals. The delay packet loss rate and transmission rate are calculated by detecting data packets, and the bandwidth signal strength and noise strength are obtained with the help of tools. Then, the delay packet loss rate, transmission rate, and bandwidth data are extracted to construct a channel quality model. The deep packet inspection engine nDPI is used to identify the service type, and the weight is dynamically adjusted according to the bandwidth ratio. At the same time, a channel signal-to-interference quantization model is constructed based on the signal strength and noise strength. Finally, the signal-to-interference quantization threshold is set to screen out qualified channels, select the channel with the largest channel quality result as the optimal channel and switch to it, effectively improving the rationality of wireless Mesh network channel selection and communication performance.

The utility model provides a noise reduction type cement ball milling test small mill. The noise reduction type cement ball milling test small mill comprises a mill, a mill support for bearing the mill, a housing, a housing support for bearing the housing, and a base for bearing the mill support and the housing support, the mill comprises a barrel and a driving mechanism for driving the barrel to rotate; a mill cover is arranged on the cylinder body; the housing covers the outer side of the barrel, a cover cap is arranged at the upper end of the housing, and a discharge port is formed in the lower end; the cover shell comprises a shell body and a noise reduction assembly arranged on the inner wall of the shell body, the noise reduction assembly comprises a sound absorption layer, a sound wave vibration conversion part, a vibration absorption damping part and a sound absorption and insulation plate which are arranged in sequence, and the sound absorption and insulation plate is attached to the inner wall of the shell body; a rubber pad is arranged at the bottom of the base. The noise reduction type small mill for the cement ball milling test can effectively reduce the intensity of noise generated in the grinding process.

The utility model relates to the technical field of circulating fans, and discloses a high-stability low-noise circulating fan which comprises a fan shell and further comprises a silencing assembly arranged on one side of an air inlet and used for weakening working noise of the fan. And the lubricating assembly is arranged in the reinforcing pipe and enables the transmission shaft to rotate more stably. The fan shell is positioned and installed at a preset place through the installation assembly, then the air outlet is connected with an external air exchange pipeline, and during work, external air can enter the fan shell through the air inlet; the noise intensity can be weakened through the sound insulation net cylinder and the sound insulation cotton, then the lubricating assembly is arranged to be matched with the infusion pump, lubricating oil can be introduced into the rolling bearing, and therefore injection of the lubricating oil can be achieved under the non-stop condition, the transmission shaft is kept stable and smooth during rotation, large noise caused by dry grinding due to the fact that the lubricating oil is dried up is avoided, and the service life of the transmission shaft is prolonged. And the effect of low-noise operation is achieved in cooperation with the silencing assembly.

The invention discloses a noise reduction control method and system for a seat and the seat, and the noise reduction control method for the seat comprises the steps that after a user sits on the seat, environment noise is obtained; obtaining noise intensity according to the environment noise; judging whether the noise intensity is greater than a noise reduction limit value; and if the noise intensity is greater than a noise reduction limit value, starting an active noise reduction mode of the seat so as to carry out noise reduction treatment on the environmental noise. By adopting the seat, a local relatively quiet space can be constructed under the condition that others are not interfered through the seat, the user privacy is protected, meanwhile, the interference of noise to the user and surrounding people can be reduced, and the use experience of the seat is effectively improved.

This invention discloses a silencing device for a Roots blower, comprising a silencing mechanism. The silencing mechanism includes a first chamber shell, the interior of which is uniformly provided with a plurality of honeycomb channels. A ventilation cavity is provided on the inner wall of the first chamber shell, and a plurality of connecting pipes are fixedly connected to the inner wall of the ventilation cavity. A first pipe is fixedly connected to the side of the connecting pipes away from the honeycomb channels. This invention improves the silencing effect of the device by combining the honeycomb channels and connecting pipes. When airflow enters the honeycomb channels, the different flow directions cause frequency interaction and cancellation, weakening the noise intensity. Furthermore, because the walls of the honeycomb channels are thin, the frequencies between six adjacent honeycomb channels easily cancel each other out, thus continuously reducing sound wave energy and achieving continuous silencing.

Methods and apparatus for temporally consistent video denoising directed at removing image noise. According to one example, a denoising algorithm uses a noise estimation block and an image denoising block operatively connected to one another. In various examples, the noise estimation block is implemented using a neural network or a filter arrangement including an entropy filter and is designed to analyze noisy frame sequences and generate a noise strength map. With this noise strength map, the image denoising block operates to perform the image denoising more efficiently, effectively reducing the image noise while preserving the texture of the original footage. In some examples, a joint loss objective is used to find configurations of both blocks that result in nearly optimal performance of the denoising algorithm.

Techniques are provided for determining magnetic resonance images showing different contrasts in an examination. Magnetic resonance data for all magnetic resonance images are acquired using the same acquisition technique and the magnetic resonance images are reconstructed from their magnetic resonance data sets using at least one reconstruction algorithm. The reconstruction comprises at least one de-noising step. After acquisition of the magnetic resonance data, at least one noise strength measure is determined for the magnetic resonance data sets for each contrast, and de-noising strengths for the de-noising step are chosen individually for each contrast depending on the respective at least one noise strength measure.

The application provides a trapped personnel position state analysis method and system, and relates to the field of data processing. In the method, a background entropy flow base state is formed by constructing the building structure distribution, conductive fluid flow channel and metal component distribution in the disaster target area, and a background entropy flow field is generated by statistically analyzing the noise strength probability distribution, channel joint fluctuation relationship and time stability index. In the search and rescue stage, the background entropy flow field is converted to a controlled mode by active disturbance, and the multi-physical channel noise response before and after the disturbance is collected by relying on a multi-field passive sensing network to construct a multi-dimensional local entropy response vector. The initial suspected area is identified and the entropy anomaly core area is extracted by combining the consistency, directionality and duration of multiple noise channels. Finally, the metabolic activity and posture restriction condition are inferred according to the local entropy response coordination relationship under different disturbance modes, and the trapped personnel position state result is output. The technical solution provided by the application is convenient for accurately identifying the position state of trapped personnel.

The utility model discloses a noise reduction ventilation structure of a soundproof room, which relates to the technical field of soundproof rooms and comprises a soundproof room, the soundproof room comprises an external wall panel, an air inlet is arranged at the top end of the right side of the external wall panel, an air outlet is arranged at the bottom end of the left side of the external wall panel, and a ventilation pipeline is fixedly mounted at the input end of the air inlet. And a mute air bellow is fixedly mounted at the other end of the ventilation pipeline. According to the utility model, the sound-absorbing cotton is arranged to absorb noise when airflow enters the ventilating duct, and airflow surging is reflected and interfered under the action of the plurality of baffles and the rubber pads, so that sound energy is reduced, and noise reduction is achieved; the conical noise reduction plate is matched to change the sound transmission direction, disperse sound energy and reduce the noise intensity in a special shape, the sound absorption holes enable sound waves to rub in the holes and convert and absorb the sound energy through a porous structure, and various kinds of noise are further effectively weakened through cooperation of the two.

The utility model discloses a silencing assembly and electrical equipment, and belongs to the technical field of noise reduction, and the silencing assembly comprises a fan cover which is provided with an air duct, the air duct comprises a first silencing section and a second silencing section which are arranged in the first direction and communicate with each other, and the first direction is the extension direction of the air duct; the first partition plate is arranged on the first silencing section and extends in the first direction, the length of the first partition plate in the first direction is smaller than that of the air duct in the first direction, the first silencing section is divided into a plurality of sub-channels by the first partition plate, and the sectional area of each sub-channel is smaller than that of the second silencing section; the section mutation is formed at the junction of the sub-channel and the second silencing section, so that sound waves are reflected at the section mutation position, and the reflection can cause energy dispersion and attenuation of the sound waves, so that the noise intensity is attenuated, and the interference to the surrounding environment of equipment is reduced; the windward area of the first partition plate can be reduced to a large extent, and blocking of airflow in the air duct is weakened.

The utility model relates to the technical field of bridge construction, in particular to a noise reduction device for bridge construction of bridge engineering. Comprising a sound insulation plate and an arc-shaped inward-bending assembly detachably installed on the top of the sound insulation plate. A winding assembly is arranged on the bent side, facing the arc-shaped inwards-bent assembly, of the sound insulation plate, a rope is installed between the arc-shaped inwards-bent assembly and the winding assembly, and a first supporting frame and a second supporting frame are arranged on the two sides of the bottom of the two sides of the sound insulation plate correspondingly. The sound insulation plate is matched with the arc-shaped inward-bending assembly to block noise, when a building is high, the hand wheel can be rotated to drive the shaft rod provided with the winding wheel to rotate, the bottom plate, the extension plate and the top plate are bent towards the side away from the building, and therefore the sound insulation plate is matched to block the noise; the problem that the intensity of noise borne by residents above the side is high due to the height difference between a bridge and a building can be solved, adjustable blocking of noise is achieved, and the noise reduction effect of bridge construction is improved.

An airflow assembly and an energy storage device. The airflow assembly comprises a first flow-through member, a second flow-through member, and a partition assembly. The first flow-through member is provided with a first flow-through opening. The second flow-through member is connected to the first flow-through member and a flow-through cavity is formed therebetween. The partition assembly is disposed between the first flow-through member and the second flow-through member, and divides the flow-through cavity into a first flow-through cavity and a second flow-through cavity arranged side by side. The first flow-through opening is communicated with the first flow-through cavity; the partition assembly is provided with a second flow-through opening, and the second flow-through opening is communicated with the second flow-through cavity; and external air is split when flowing through the airflow assembly, and flows out of the airflow assembly via the first flow-through cavity and the second flow-through cavity, respectively. The partition assembly divides the flow-through cavity into multiple spaces. When noise propagates in the airflow assembly, sound waves of the noise experience impedance mismatch due to sudden spatial changes, such that the sound waves of the noise are reflected continuously, causing the noise intensity to attenuate, thereby achieving a noise reduction effect.

The present invention discloses a LoRa concurrent communication demodulation method and system based on frequency-domain interference iterative cancellation, including signal transmission; taking chirp signals as processing units, the node end transmits signals in the standard LoRa data packet frame format; signal reception; the gateway end receives LoRa signals in a conflict state based on the frequency-domain characteristics of the pilot part, and the conflict state means that multiple data packets are transmitted in the same time period; signal preprocessing; performing low-pass filtering and signal synchronization on the LoRa signals in the conflict state, dividing them into multiple chirp symbols with the chirp length as the step size, and performing carrier frequency offset correction on the chirp symbols; conflict signal demodulation; performing frequency-domain interference estimation and cancellation on the chirp symbols preprocessed in step three to complete symbol demodulation. The demodulation method provided by the present invention has stronger robustness under low signal-to-noise ratios and can complete the demodulation of conflict signals when the signal strength is much lower than the noise strength.

The utility model relates to mould technical field especially elevator door hanging plate processing mould, including box and mould, the box is linked with mould surface sliding through the chute of inside surface opening and sliding, the box surface is equipped with mould replacement device, the box surface fixed link has the shell, the shell penetrates the box surface, the shell surface is equipped with the noise reduction adjusting device, this elevator door hanging plate processing mould, through the cooperation of noise reduction adjusting device and box, the extension of telescopic end of hydraulic cylinder drives the stamping block and mould cooperation to the elevator door hanging plate raw material and processes, the noise produced when stamping can be blocked by the sound insulation cotton layer inside the box and the baffle, reduce the noise intensity that transmits to the outside world, the noise produced when processing can be reduced through the relative sealing of the baffle to the box, the influence of the operating personnel health can be reduced.

The utility model provides sound insulation and noise reduction composite glass. The sound insulation and noise reduction composite glass comprises a first glass unit, a second glass unit and an outer frame, a first mounting groove, a second mounting groove and a clamping block are arranged on the inner side of the outer frame; the first glass unit comprises a first glass slide, a first damping glue layer and a second glass slide which are sequentially overlapped, the end part of the first glass unit is matched and connected with the first mounting groove, the second glass slide is positioned on one side relatively close to the second glass unit, and the thickness of the second glass slide is smaller than that of the first glass slide; the second glass unit comprises a third slide, the thickness of the third slide is greater than that of the second slide, and the end part of the second glass unit is matched and connected with the second mounting groove; a hollow inner cavity is formed between the first glass unit and the second glass unit. According to the utility model, the noise intensity is reduced through the damping glue layer and the hollow inner cavity, and the resonance phenomenon is avoided by designing the thickness of the slide, so that better sound insulation and noise reduction effects are realized.