33 results about "Internal noise" patented technology

A microwave quantum detection method based on environmental noise fine perception comprises the following steps: step 1, constructing a parallel link of environmental noise perception and signal detection, adding an antenna and a low-temperature switch at the front ends of the environmental noise perception link and the signal detection link, connecting the two links in parallel, and switching between the environmental noise perception and the signal detection; step 2, acquiring environment noise distribution by using an environment noise sensing link: operating a low-temperature switch, selecting the environment noise sensing link, testing internal noise of the environment noise sensing link by adopting a cold and hot load method, and measuring external environment noise by using the environment noise sensing link; and step 3, pointing to a target orientation by using a signal detection link, and performing signal detection: operating a low-temperature switch, selecting the signal detection link, determining an antenna pointing angle, obtaining environment noise of the angle, setting attenuation of an adjustable attenuator according to the external environment noise, and detecting signals by using a microwave quantum detection device.

The utility model relates to the technical field of noise reduction motor covers, and discloses a noise reduction motor cover structure, which comprises a cover shell and a cover cap, the cover cap is arranged at the bottom end of the cover shell, the inner wall of the cover cap is fixedly connected with second sound absorption cotton, the outer part of the second sound absorption cotton is fixedly connected with a second sound absorption plate, and the outer part of the second sound absorption cotton is fixedly connected with the second sound absorption plate. The inner wall of the housing is fixedly connected with first sound-absorbing cotton, and the exterior of the first sound-absorbing cotton is fixedly connected with a first sound-absorbing plate. According to the silencing motor cover structure, parts such as a cover shell are arranged, the inner wall of a cover cap is fixedly connected with second sound absorption cotton, the outer portion of the second sound absorption cotton is fixedly connected with a second sound absorption plate, the inner wall of the cover shell is fixedly connected with first sound absorption cotton, and the outer portion of the first sound absorption cotton is fixedly connected with a first sound absorption plate; the sound-absorbing cotton and the sound-absorbing plate can be used for conveniently absorbing and reducing internal noise, so that the noise generated when the motor works is conveniently absorbed and isolated, and the problem that the noise reduction effect is not good enough due to the fact that a function of strengthening sound insulation and noise reduction is not arranged inside is solved.

The utility model relates to the technical field of vehicle air conditioner noise elimination, in particular to a vehicle air conditioner air duct assembly internal noise elimination mechanism which comprises a noise elimination cylinder, a fixing piece used for fixing noise elimination cotton in the noise elimination cylinder is arranged in the noise elimination cylinder, and positioning pieces used for limiting the fixing piece in the noise elimination cylinder are arranged at the two ends of the noise elimination cylinder. One end of the outer wall of the silencing cylinder is fixedly connected with two symmetrical flange rings. According to the utility model, the two sponges and the silencing cotton are used for silencing flowing air for multiple times, so that when an air conditioner in a vehicle is started, the interior of the vehicle is quieter, the sponges can absorb moisture and impurities in the flowing air, the service life of the silencing cotton is longer, and the limiting ring is detachably connected with the silencing barrel and the connecting ring, so that the silencing effect is better. Not only can the silencing cotton be quickly disassembled and assembled, but also the silencing barrel, the fixing piece and the positioning piece can be recycled, so that the resource loss is reduced, and the cost expenditure of a driver is reduced.

The utility model discloses a noise-reduction wear-resistant steel ball, which relates to the technical field of wear-resistant steel balls, and comprises a steel ball body, a limiting groove is arranged on the surface of the steel ball body, a wear-resistant layer is fixedly connected in the limiting groove, an internal noise-reduction structure is fixedly connected in the steel ball body, and the wear-resistant layer is fixedly connected in the internal noise-reduction structure. The internal noise reduction structure comprises a filling cavity and a filling layer in the filling cavity. The effect of keeping the overall strength of the steel ball is achieved through the honeycomb-shaped filling cavities, in actual use, the compression strength loss of the steel ball is smaller than 5%, the steel ball body has good stability, the effect of absorbing vibration energy is achieved through the filling layer made of the composite damping material, and the service life of the steel ball is prolonged. And therefore, the steel ball body has a good noise reduction effect.

The present disclosure provides a test method and device, electronic equipment and storage medium. The present disclosure relates to the technical field of computers, specifically to the technical field of software testing. The specific implementation scheme is: in response to detecting a test instruction, running a test software, the test software integrating a to-be-tested speech recognition service software development kit (SDK) and a player SDK, the to-be-tested speech recognition service SDK and the player SDK belonging to different processes, the to-be-tested speech recognition service SDK and the player SDK being capable of cross-process communication, the player SDK being used for processing internal noise data; obtaining performance data of a process in which the to-be-tested speech recognition service SDK is located formed in a running process of the test software; and determining a performance test result of the to-be-tested speech recognition service SDK based on the performance data of the process in which the to-be-tested speech recognition service SDK is located. According to the scheme of the present disclosure, the accuracy of the performance test of the speech recognition service SDK can be improved.

This invention provides a low-noise amorphous alloy three-dimensional transformer. The invention relates to the field of amorphous alloy transformer technology, and includes an internal noise reduction mechanism installed inside the transformer body and a second noise reduction component installed on the outside of the transformer body. The transformer body includes a housing, heat sinks, an oil tank, and a core module. The oil tank and core module are installed inside the housing, and the heat sinks are fixed to the outside of the housing. The internal noise reduction mechanism includes a buffer component, a first noise reduction component, a mounting component, and a barrier chamber. Through the coordinated use of the buffer component, the first noise reduction component, and the second noise reduction component, this solution establishes a three-level coordinated noise reduction system of "source vibration reduction, near-field isolation, and remote shielding." The vibration of the core module is directly absorbed by an air spring, and the double-layer structure of the barrier chamber and the outer protective cover achieves full-path blocking of solid-borne sound and airborne sound, ultimately meeting the most stringent quiet zone standards for noise emission.

The invention provides a high-precision delta-sigma modulator based on time-sharing chopping. The high-precision delta-sigma modulator comprises a first-stage integrator, a second-stage integrator, a third-stage integrator, an adder, a comparator, two pairs of chopper circuits and an analog-to-digital converter, according to the invention, two pairs of chopper circuits are arranged, a time-sharing clock control technology is adopted, and a virtual device layout matching design is combined, so that accurate suppression of multi-source low-frequency interference is realized. The modulator adopts a three-order CIFF architecture, internal noise and imbalance of an operational amplifier are eliminated through a time-sharing controlled chopper 1, input charge injection, switching nonlinearity and DAC feedback errors are eliminated through a system-level chopper 2, and the stability of the sampling and integration process is ensured in cooperation with an optimized clock delay design. Under the sampling frequency of 1.024 MHz, the signal-to-noise distortion ratio reaches 106.7 dB, the noise suppression capability is improved by 68.1 dB, and the total power consumption is only 504 mu W.

A computer-implemented method for filtering at least one useful signal from at least one noisy acoustic signal of an input signal, includes receiving, from at least one acoustic sensor, the input signal, wherein the at least one useful signal is designed as a siren signal, wherein the input signal is noisy due to wind noise, tire rolling noise, or vehicle internal noise, and a noise component of the input signal masks the at least one useful signal contained in the input signal. The method further includes applying at least one correlation function to the input signal, wherein the correlation function is applied iteratively to result data of the correlation function to increase a signal-to-noise ratio of the input signal.

The ultra-silence HDPE pipe comprises an inner pipe body and an outer pipe body, supporting connecting ribs are arranged between the inner pipe body and the outer pipe body in the circumferential direction at equal intervals, porous silence foam pads are filled in gaps among the inner pipe body, the outer pipe body and the supporting connecting ribs, and drainage plates parallel to the central axis of the inner pipe body are arranged on the inner wall of the inner pipe body in the circumferential direction at equal intervals. The inner wall of the inner pipe and the surface of the drainage plate are each provided with a mute coating, and the surface of the outer pipe is provided with a porous mute outer sleeve. The porous mute foam pad is arranged in the inner pipe, the porous mute outer sleeve is arranged outside the outer pipe, noise reduction is conducted through a porous structure, outward transmission of internal noise is reduced, and the mute effect is improved; a drainage plate is arranged in the inner pipe, and a mute coating with a more compact and smoother structure is arranged, so that noise is reduced fundamentally; the drainage plate in the vertical pipeline can increase the wall-hanging guiding effect of water flow, and large noise caused by impact due to direct falling is reduced; and the mute effect is further improved on the basis of the existing double-layer structure.

This application discloses a thermally broken aluminum alloy casement window, belonging to the field of doors and windows. It includes an outer frame, an inner frame installed inside the outer frame via a thermally broken strip, a side frame mounted on the inner wall of the inner frame via two hinges, a sash frame fixedly installed on one side of the side frame, and a glass assembly installed inside the sash frame. Both the inner frame and the sash frame are equipped with Helmholtz resonators. The sound insulation layer filled inside the sash frame effectively isolates external noise and reduces the impact of internal noise. At the same time, some sound energy can be absorbed by the outer tempered glass and the intermediate PVB film, while the air layer of the inner double-glazed glass can further block the transmission of sound waves. Furthermore, the Helmholtz resonator can be used to specifically absorb noise of a certain frequency.

The application relates to a kind of automobile air conditioner refrigerant flow noise analysis method and system, comprising the following steps: the measured vehicle is placed in the preset test environment, and the internal noise of the measured vehicle is collected;Determine whether the internal noise of the measured vehicle is airflow sound, if so, the internal noise of the measured vehicle is converted into loudness peak difference and sharpness peak difference, otherwise, determine whether the internal noise of the measured vehicle is flow water sound;If so, calculate the kurtosis value of expansion valve vibration, otherwise, the internal noise of the measured vehicle collected this time is useless data, discarded and ended;According to the loudness peak difference, sharpness peak difference and expansion valve vibration kurtosis value, combined with the preset noise severity evaluation method, the air conditioner refrigerant flow noise is evaluated, and the evaluation result is output.The application effectively quantifies the size of refrigerant flow noise objectively, and avoids the subjective evaluation difference of different groups of people on fan beat frequency noise annoyance.

The application relates to a method and system for simulating internal noise of a slave clock in a master-slave synchronization network in the technical field of clock synchronization, and comprises the following steps: establishing a first equivalent model and a second equivalent model; generating a first phase-locked loop output power spectral density function based on the first equivalent model and generating a second phase-locked loop output power spectral density function based on the second equivalent model; calculating a loop bandwidth condition equivalent to the first equivalent model and the second equivalent model; updating the second phase-locked loop output power spectral density function using the loop bandwidth condition, and calculating the gain coefficient and the slave clock bandwidth of the second equivalent model using a TDEV template and an MTIE template, and then updating the second phase-locked loop output power spectral density function again to obtain a noise generation time domain function. The method solves the problem that the existing method for simulating internal noise of a slave clock only considers a TDEV template and does not consider an MTIE template, so that the corresponding MTIE of the generated time domain noise exceeds the MTIE template limit, and the stability of the slave clock cannot be accurately simulated.

The invention belongs to the technical field of communication measurement noise cancellation, and particularly relates to a noise cancellation method based on a WIFI7 standard protocol and application thereof. A real-time measurement average noise cancellation algorithm is adopted, and a noise coefficient is calculated by capturing internal noise when no signal is input and capturing average extracted total noise signals for multiple times, so that external noise is estimated, and single-time captured signals are corrected. According to the invention, a noise cancellation method based on measurement averaging is adopted, so that not only can inherent noise of the signal analyzer be eliminated, but also ircoherent noise in the signal can be eliminated; a convolution correlation algorithm is adopted for synchronization, and the method is suitable for more complex noise environments; and a real-time dynamic averaging method is adopted, so that the stability of the offset effect can be ensured, and the algorithm efficiency is improved. In addition, the method is low in implementation cost and complexity, can be implemented in an FPGA (Field Programmable Gate Array) or a DSP (Digital Signal Processor) in a software mode, has good reconstruction capability and is very suitable for various application environments.

The utility model belongs to the technical field of generator sets, and particularly relates to a novel rain-proof wind scoop which comprises a wind guide assembly, a wind scooper and a wind scooper, the air inlet hole is formed in the side wall of the generator set and located in one side of the air guide assembly; the air guide assembly comprises at least one Z-shaped plate and at least one inverted first L-shaped plate; a gap between the Z-shaped plate and the L-shaped plate is an air inlet channel; the second L-shaped plate is arranged at the air outlet end of the air inlet channel so as to guide the air flow to the upper part of the interior of the generator set; by arranging the air guide assembly, the air inlet channel is prolonged, the air inlet speed is reduced, and the air flowing noise is reduced; the air channel is of a partition structure and is matched with sponge, outward transmission of internal noise is reduced, and noise pollution is reduced.

The application discloses an open-vocabulary human-object interaction detection method based on a calibrated diffusion model and relates to the technical fields of computer vision and artificial intelligence. The method adopts a two-stage teacher-student learning framework: a teacher model calibrates a generative diffusion model by injecting human-computer interaction prior knowledge to generate low-noise and fine-grained visual features for human-object interaction regions; a student model is an end-to-end detection framework that is optimized as a whole under the supervision of a hybrid loss, thereby avoiding suboptimal problems caused by multi-stage independent training, making the detection process more efficient and the performance more optimal. By introducing a human-object pair learner and a local perception decoder and combining knowledge distillation of the teacher model, the method can more deeply understand the essential semantics and spatial relationships of interaction and has stronger generalization ability for novel and unseen interaction scenes. The method can effectively suppress the internal noise of a pre-training model and make the features highly aligned with an HOI task.

The present invention relates to a wireless sound device and a control method thereof, in which at least one of sound volume adjustment and noise cancelling operation is appropriately selected according to a user's preference and / or situation so that noise according to an external ambient sound is reduced and a sound can be thus provided to the user. The present invention may provide a wireless sound device comprising: a wireless communication unit for performing wireless communication with a sound source device; a speaker for outputting a sound source signal received from the sound source device; an external microphone for picking up an ambient sound; an internal microphone for picking up an in-ear sound and internal noise; and a control unit for performing sound volume control and ANC control to reduce an influence of the internal noise, wherein the control unit performs control so that, when reduction in the internal noise is insufficient after one of the sound volume control and the ANC control is performed preferentially, the other of the sound volume control and the ANC control is further performed.

The filtering device with the noise reduction function comprises a pressure-bearing shell, a liquid inlet pipeline is arranged at the left end of the pressure-bearing shell, a liquid outlet pipeline is arranged at the right end of the pressure-bearing shell, and seawater flows in from the liquid inlet pipeline and flows out from the liquid outlet pipeline; an inlet noise reduction assembly is arranged at the liquid inlet pipeline, an outlet noise reduction assembly is arranged at the liquid outlet pipeline, the pressure-bearing shell is provided with a filter screen and an internal noise reduction assembly, the filter screen is used for filtering impurities in seawater, and the inlet noise reduction assembly, the internal noise reduction assembly and the outlet noise reduction assembly are matched to be used for absorbing flow-induced vibration of the seawater; according to the filtering device with the noise reduction function, the filtering function and the noise reduction function are integrated in the same equipment, the structural compactness and the overall performance of the equipment are greatly improved, the space occupation of a system is effectively reduced, and weight reduction and miniaturization development of the system are facilitated.

The invention provides an active reconstruction system and method for noise in a GIS hand hole based on a waveguide diffusion effect. The method comprises the following steps: annularly arranging a plurality of miniature antenna transmitters in the hand hole; the field intensity is enhanced by utilizing waveguide diffusion of the metal cavity; a standard built-in ultrahigh frequency sensor is used in the GIS hand hole; injecting the acquired noise into k micro antennas; the signals are ensured to be superposed in the hand hole cavity through propagation time delay compensation; and the micro antenna group outputs an equivalent noise signal s (t). According to the method, Gaussian pulse synthesis and time delay control are combined, and low-power equivalent high-field-intensity noise reconstruction is achieved.

Techniques and apparatus for performing internal noise source filtering for active acoustic sensing are described. The internal noise source filtering (202) attenuates interference in received ultrasound signals caused by the hearable (102) performing other operations (e.g., rendering audio content (204), performing active noise cancellation (206), or operating in a transparency mode (214)) to improve the sensitivity and accuracy of audio plethysmography. This improved performance allows audio plethysmography to be performed while the hearable (102) is performing these other operations. Furthermore, this improved performance improves the functionality of audio plethysmography for use in audio processing, which may include voice activity detection, speech recognition, and / or conversation detection.

The invention relates to a method for reliably operating different types of propagation time-based field devices (1), such as radar-, ultrasound-, and TDR-based field devices. The method has the following method steps: - in a comparison mode, a comparison signal (RHF,a) is recorded as the received signal (RHF), the comparison signal not being influenced by the propagation time signal (SHF), and - in a measurement mode, the propagation time signal (SHF) is transmitted, the corresponding received signal (RHF) is recorded, the received signal (RHF) is compared with the comparison signal (AHF), and the process variable is determined using the compared received signal (RHF, a). The invention is thus based on the concept of recording a received signal (RHF), which is independent of the transmitted propagation time signal (SHF), for comparison or analysis purposes, since this ensures that any signal component in the resulting comparison signal (AHF) must be internal noise or external interference sources.

The utility model relates to the technical field of system windows, in particular to a multilayer noise reduction system window which comprises a window frame, a broken bridge window assembly fixedly installed on the inner side of the window frame, a ventilation window assembly fixedly installed on the side face of the window frame, a plurality of sets of sound receivers fixedly arranged on the side face of the window frame, and a controller and a noise reducer fixedly arranged at the bottom of the inner side of the window frame. The controller and the noise reducer are arranged on the two sides of the broken bridge window assembly. The multi-layer sound insulation and noise reduction device has the beneficial effects that noise reduction treatment can be actively conducted on outside sound through the sound receiver, the controller and the noise reducer equipment, the sound can be transmitted and reflected in a cavity of the internal noise reduction cotton through cooperation of the inner glass plate, the outer glass plate and the noise reduction cotton, sound waves are absorbed through the noise reduction cotton, and therefore multi-layer sound insulation and noise reduction are achieved; in addition, the heat insulation coating is arranged on the outer side of the glass structure, the heat insulation performance of the system window is improved, and the insect-proof and dust-proof effects are achieved while the indoor ventilation efficiency is improved through the design of the movable window and the ventilation window body.

The invention belongs to the technical field of electronic test instruments, and particularly relates to a signal generator analog channel structure and method for reducing signal floor noise, and the structure is sequentially connected with a first-stage amplification unit, a first attenuation network, a second-stage amplification unit, a second attenuation network and a power amplification unit along a signal transmission direction. Wherein the second-stage amplification unit adopts N operational amplifiers (N is greater than or equal to 2) which are arranged in parallel, and the noise density of the input reference voltage is remarkably reduced by utilizing the synchronous amplification effect of the parallel operational amplifiers on signals and the averaging effect on internal noise. In addition, each attenuation network adopts a passive resistance network controlled by a relay, so that nonlinear distortion and power supply noise introduced by an active switch are avoided. Through the synergistic effect of preceding-stage high-gain distribution, parallel operational amplifier noise reduction and relay passive attenuation, the overall bottom noise of an analog channel is effectively reduced, and the signal-to-noise ratio during small signal output is remarkably improved.

The utility model discloses a step-in silent high and low temperature test box, which relates to the technical field of high and low temperature test boxes, and comprises a buffer cabinet, the rear end of the buffer cabinet is provided with a silent test cabinet used for reducing the noise inside the test box, and one side of the buffer cabinet and one side of the silent test cabinet are provided with a temperature supply mechanism used for providing high and low temperature environments. Through the temperature supply mechanism, when testing is carried out, hot air or cold air is input into the buffer cabinet and the test cabinet through the buffer area high-low temperature host and the test area high-low temperature host via the input pipe, so that the internal temperatures of the buffer cabinet and the test cabinet are changed according to requirements, and the performance and the function of the electronic product in the high-low temperature environment are better verified. Through the mute test cabinet, the internal sound absorption layer, the internal sound insulation layer, the hollowing layer and the external sound insulation layer are wrapped layer by layer to form a mute chamber, so that the purpose of mute is achieved, and the problems that due to the fact that internal noise is large, audio performance detection of electronic products cannot be achieved, and noise measurement cannot be carried out when operation is carried out on structural parts of the electronic products are avoided.

This invention relates to the field of audio processing technology and provides a method and system for individualized noise reduction in Bluetooth headsets. The method includes: acquiring raw time-domain noise signals from outside the headset via an external microphone and error signals from inside the headset via an internal microphone; performing frame-by-frame preprocessing on the raw time-domain noise signals to obtain continuous signal frames; decomposing each signal frame into noise components and their time-domain signals with different time-frequency characteristics; generating corresponding anti-noise signals based on multiple noise components and the error signals; calculating the mixing weights corresponding to each noise component based on the error signals and the time-domain signals; and weighting and synthesizing the anti-noise signals corresponding to multiple noise components into an inverted acoustic wave signal. Through refined processing of external and internal noise signals, the effectiveness and adaptability of noise reduction technology can be significantly improved.

The application provides a high-speed signal line layout structure of a chip and a manufacturing method thereof. The layout structure comprises a substrate, a surface of the substrate being provided with a groove; an NT_N mask layer, formed in the groove of the substrate; a shielding layer, formed on the top of the NT_N mask layer, the shielding layer corresponding to the NT_N mask layer, and the shielding layer being grounded; and a high-speed signal line, formed on the top of the shielding layer; wherein the length of the high-speed signal line exceeds the boundary of the shielding layer. The application can reduce the coupling between the high-speed signal and the substrate, reduce the crosstalk caused by the internal noise of the substrate, create a local environment with high resistance and low loss, and thus improve the integrity of the signal.

The utility model provides a receiver noise reduction device and electronic equipment, and the device comprises an internal noise monitoring microphone which is used for monitoring an internal noise signal, and the internal noise signal is based on a circuit board structure or is generated during signal transmission; the noise processing module is used for performing noise elimination processing on the to-be-played audio based on a preset noise elimination algorithm by referring to the internal noise signal before the receiver plays the to-be-played audio; and the noise reference loop is used for acquiring an internal noise signal from the internal noise monitoring microphone, transmitting the internal noise signal to the noise processing module, and transmitting the to-be-played audio after noise elimination to the receiver. Through application of the method and the device, the technical effect that the receiver can overcome the influence of noise caused by low-frequency magnetic interference, idle channel noise and capacitance howling is achieved, and the problem that the low-frequency magnetic interference, the idle channel noise and the capacitance howling cause interference on the audio played by the receiver in the prior art is solved.

The present application relates to a kind of mountainous highway construction area intelligent monitoring method, belong to data processing technical field.The method is obtained by the feature difference screening of extreme value and normal extreme value in stress data target extreme value, based on target extreme value with EMD algorithm decomposition stress sequence obtains initial component, then the time series stability of each initial component is further analyzed, it is decomposed to obtain stress component by adaptive repeated decomposition, and interference source is decomposed to obtain interference component, then the change characteristics of interference component and stress component are compared to determine the noise interference degree of each stress component, with the noise interference degree to stress component is filtered to obtain denoised stress data.The present application is combined with the scene of the scene of mountainous highway construction this kind of noise complex and changeable, and stress steady state also changes, and the data adaptive decomposition and component internal noise are targeted to remove, compared with existing fixed decomposition denoising strategy, can significantly improve denoising effect to improve stress monitoring accuracy.

The application discloses a construction site regional active noise reduction barrier system based on a sound wave dome, which comprises a barrier main body, a reference microphone array, a control system, an error microphone and a feedback control module. The barrier main body comprises a cage frame covered on a construction site, and a micro-perforated sound absorption board and a noise reduction interlayer are arranged on the inner side of the cage frame. The reference microphone array is used for collecting multi-channel sound pressure data and phase information in the construction site in real time. The control system is used for establishing a time-space model of internal noise based on the multi-channel sound pressure data and phase information collected by the reference microphone array, and performing a multi-channel adaptive control algorithm to calculate the driving phase and amplitude of each loudspeaker so that the loudspeaker array emits a superimposed sound field. The error microphone is used for collecting sound pressure data and phase information at a desired noise reduction position. The feedback control module is used for generating an error signal, and the error signal is fed back to the control system after delay compensation on a driving phase and amplitude compensation signal to adjust the phase and amplitude of the loudspeaker driving signal.