119 results about "External noise" patented technology

A system for vehicle exterior noise reduction, comprising: a measuring component for measuring an amplitude and a phase of an exterior noise, the exterior noise propagating at least partially in a first direction from at least one exterior noise source of a vehicle and having an acoustic transmission path, wherein the exterior noise propagates at least partially below a bottom of the vehicle; a computing component for computing an out-of-phase signal based at least in part on the measured amplitude and phase of the exterior noise; and a generating component for generating an out-of-phase sound based at least in part on the computed out-of-phase signal, the out-of-phase sound configured to cancel the exterior noise, wherein the generated out-of-phase sound propagates at least partially in the first direction of the acoustic transmission path.

The present application relates to the technical field of electronic devices, and particularly relates to an electric connector, which comprises an insulating body, two rows of terminals, a plurality of inner shielding sheets and two outer shielding sheets; the insulating body is provided with two side walls and a butt joint groove between the side walls; the terminal comprises a main body, an elastic arm and a pin, and the elastic arm is provided with a contact part protruding into the butt joint groove; each row of terminals comprises a plurality of signal terminal pairs and two ground terminals on both sides of each signal terminal pair; each inner shielding sheet is integrally connected with the two ground terminals on both sides of the corresponding signal terminal pair and is located at the inner side of one row of terminals; each outer shielding sheet is located at the outer side of one row of terminals and contacts the ground terminal. In the present application, each signal terminal pair is located between the inner shielding sheet and the outer shielding sheet, which can effectively reduce the interference of internal and external noise on the signal terminal pair, and the inner and outer shielding sheets are both electrically connected with the ground terminal, so that multiple common grounds are achieved, the resonance effect is effectively improved, and the high-frequency high-speed signal transmission performance is improved.

The utility model relates to the technical field of vehicle interior trim parts, and particularly discloses a vehicle interior trim door plate assembly, a vehicle door and a vehicle. The interior trim door plate assembly comprises an outer layer plate, an inner layer plate, a reinforcing assembly and a sound insulation assembly; the inner-layer plate comprises a plate body and a connecting part, the connecting part is arranged at the edge of the plate body, the connecting part and the plate body form a containing cavity with an opening, and the outer-layer plate is connected with the connecting part and seals the opening; the reinforcing assembly is arranged in the containing cavity, connected with the plate body and abuts against the inner wall, located in the containing cavity, of the connecting part. The sound insulation assembly is arranged in the containing cavity, the sound insulation assembly and the containing cavity are arranged in a profiling mode, and the two opposite sides of the sound insulation assembly are connected with the reinforcing assembly and the outer layer plate correspondingly. According to the reinforcing assembly, the bending resistance and the impact resistance of the interior door plate assembly can be enhanced, and therefore the service life is prolonged; and the sound insulation assembly in profiling design with the containing cavity can reduce transmission of external noise, and the sound insulation effect is improved.

The invention discloses an acoustic detection method based on acoustic difference, an acoustic difference device and an acoustic detection system. The method comprises the following steps: providing at least one acoustic differential pair; the acoustic differential pair comprises a first piezoelectric sensing unit and a second piezoelectric sensing unit which are opposite in polarization direction. Detecting an acoustic signal by using the acoustic differential pair to obtain an acoustic differential signal; wherein the acoustic differential signal comprises two paths of electric signals; the two paths of electric signals are obtained by carrying out acoustic-electric conversion on acoustic signals by the first piezoelectric sensing unit and the second piezoelectric sensing unit; and transmitting the acoustic differential signal to a differential processing module for differential operation so as to suppress the external noise coupled to the transmission path and obtain a detection signal after noise suppression. According to the method, external noise can be suppressed from a signal source without depending on a complex hardware structure or a software algorithm, and the signal-to-noise ratio, the measurement precision and the robustness of the piezoelectric sensing system in complex environments such as strong electromagnetic interference and mechanical vibration are remarkably improved.

The application relates to the technical field of industrial earmuffs, and provides an industrial noise reduction earmuff with working condition self-adaptive adjustment, which comprises a supporting block arranged on a safety cap shell, an adjusting unit arranged on the outer surface of the supporting block and used for adjusting the sealing effect of the earmuff and the human body, an earmuff shell fixedly connected to the bottom of the adjusting unit, a decibel detector fixedly connected to the outer side of the earmuff shell, a detection ring connected to the decibel detector through an electric wire, sound-absorbing cotton placed in the interlayer of the earmuff shell, and an air inflation air bag fixedly connected to the inner side of the earmuff shell; a first adjusting unit and a second adjusting unit arranged on the inner wall of the earmuff shell; the sound-absorbing cotton can absorb part of the noise from the outside, and the detection ring can detect the size of the external noise so as to drive the adjusting unit, the first adjusting unit and the second adjusting unit to work, and the noise reduction effect is self-adjusted according to the actual working condition.

The utility model discloses sound insulation tempered glass which comprises a supporting frame, a sliding groove is formed in one side of the supporting frame, a sealing frame is connected into the sliding groove in a sliding mode, two tempered glass bodies are fixedly connected into the sealing frame, a rack is fixedly connected to the bottom of the sealing frame, and a motor is fixedly connected to one side of the supporting frame. An output shaft of the motor extends into the sliding groove and is fixedly connected with a gear, and the gear is connected with the rack in an engaged mode. The utility model has the beneficial effects that the glass with good sealing can effectively isolate indoor and outdoor heat exchange, reduce the use frequency of an air conditioner and heating equipment and reduce the energy consumption and cost, and the continuous sealing can effectively isolate external noise and provide a quiet environment for the indoor space, which is particularly important in busy traffic or noisy areas. Compared with a traditional device, the operation quality and the use efficiency are greatly improved.

The utility model relates to the technical field of toughened glass, and discloses sound insulation and noise reduction toughened hollow glass which comprises a mounting frame, a glass frame is arranged in the mounting frame, a toughened hollow glass body is arranged in the glass frame, fixing boxes are fixedly connected to the two sides of the interior of the mounting frame, and the fixing boxes are fixedly connected to the two sides of the interior of the mounting frame. Sliding plates are slidably connected to the interiors of the multiple fixing boxes, pull rods are fixedly connected to the interiors of the multiple sliding plates, pull plates are fixedly connected to the upper portions of the multiple pull rods, locking rods are fixedly connected to the two sides of the exteriors of the multiple pull rods, and grooves are formed in the periphery of the interior of the glass frame; and the multiple locking rods are rotationally connected into the groove. According to the utility model, the glass can be conveniently mounted and dismounted, the construction and maintenance efficiency is improved, the introduction of external noise is effectively blocked, and efficient sound insulation and noise reduction effects are provided.

1. The name of the design product: indoor soundproof cabin. 2. The use of the design product: isolate external noise, for entering office and rest. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention discloses a noise online monitoring microphone sensitivity comparison calibration device and method. The device comprises an open cavity, a microphone to be calibrated, a monitoring microphone, a pure tone generator, a sound guide tube and a control unit, wherein the open type cavity is provided with a first connecting end and a second connecting end which are oppositely arranged, the first connecting end is used for being communicated with the sound inlet side of the microphone to be calibrated, the second connecting end is used for being communicated with the sound inlet side of the monitoring microphone, and the side wall of the open type cavity is provided with a plurality of through holes communicated with the external environment. External noise can enter the open type cavity; the sound guide tube is used for communicating the pure tone generator with the sound guide interface of the open cavity so as to guide the pure tone output by the pure tone generator into the open cavity; and the control unit is in signal connection with the pure tone generator, the monitoring microphone and the microphone to be calibrated, and is used for adjusting the output of the pure tone generator based on a feedback signal of the monitoring microphone, so that after a pure tone sound field in the open cavity reaches a preset reference condition, the microphone to be calibrated is calibrated. And reading a return signal of the microphone to be calibrated to obtain the sensitivity or the sensitivity characterization value of the microphone to be calibrated.

The utility model relates to the technical field of wallboards, and discloses a light composite heat preservation and fire prevention integrated prefabricated wallboard which comprises a wallboard body, a reinforcing assembly is arranged in the wallboard body, a mounting plate is arranged on the surface of the wallboard body, a fire prevention coating is sprayed on the surface of the mounting plate, and a heat preservation assembly is arranged on one side of the mounting plate. According to the light composite heat preservation and fire prevention integrated prefabricated wallboard, through the arrangement of the fire prevention coating and the heat preservation assembly, when the wallboard is used, the fire prevention coating is used for preventing the device from catching fire, the heat preservation layer is used for preserving heat so that the indoor temperature can be proper, and the sound insulation board can effectively prevent external noise from being introduced and reduce the indoor noise level; and therefore, the device can keep relative structural integrity to a certain extent, the stability of the device in a fire disaster is improved, meanwhile, the heat preservation capacity of the device can be improved, and the comfort degree of the device during use is improved.

The application discloses a kind of high-precision indirect signal reconstruction-based wheeled robot system fault-tolerant control method.This method under the interference of external noise, establishes the wheeled robot system containing unknown system state and actuator fault, gives its system output function, constructs indirect variable based on unknown system state and actuator fault, obtains estimation error system.In addition, a distributed fault-tolerant controller containing estimated state and fault is designed to act on the continuous time of system, to ensure that estimation error system is uniformly ultimately bounded, to realize the synchronization of error system.

1. Name of the product in this design: Earplugs (E06D). 2. Purpose of this design: Earplugs for reducing external noise. 3. The key design features of this product are its overall shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The present invention relates to an adaptive active noise cancellation device and a sound playing system using the same. The adaptive active noise cancellation device shapes a received error signal and an interference signal according to a shape of an ideal noise, and then sends the shaped interference signal and the shaped error signal to a parameter adjustment unit to perform adaptive parameter adjustment. Thus, the adaptive active noise cancellation device can not only adaptively suppress external noise to minimize the error signal, but also suppress specific frequencies to which human ears are sensitive.

The invention discloses a self-adaptive subspace projection suppression method based on optical pump magnetometer external noise, and belongs to the technical field of neural magnetic imaging (MEG) signal processing.The method comprises the steps that brain magnetic signals are collected through a wearable optical pump magnetometer array and preprocessed, and a signal and noise subspace decomposition model is established; integrating a model-driven noise modeling method and a data-driven noise modeling method, and constructing a noise subspace base vector; constructing a signal subspace basis vector in combination with a guide field matrix and event correlation analysis; identifying residual noise components based on event correlation analysis, and perfecting noise subspace modeling; signal noise separation is realized by adopting a hierarchical projection strategy; and analyzing the time correlation of internal and external space signals, and constructing a time projection matrix to remove residual interference to obtain a clean MEG signal. According to the invention, various types of external noise interferences can be effectively suppressed, the signal-to-noise ratio and the reliability of brain magnetic signals are remarkably improved, and the method is particularly suitable for practical application of a wearable optical pump magnetometer system.

This utility model provides a sound-insulating and heat-insulating interlayer for tents, relating to the technical field of outdoor tent products. It includes an outer abrasion-resistant layer, a first heat-insulating layer on one side of the outer abrasion-resistant layer, and a protective layer on the side of the first heat-insulating layer away from the outer abrasion-resistant layer. This sound-insulating and heat-insulating interlayer for tents absorbs noise from the surrounding environment through a noise-reducing layer, and the noise-reducing grooves inside the noise-reducing blocks further enhance the absorption of external noise, thus improving the tent's noise reduction effect. The protective layer protects the inner fabric of the tent from scratches by sharp objects, and the folding holes inside the protective layer increase its flexibility, facilitating tent folding. A mosquito-repellent layer soaked in a medicinal solution emits a medicinal fragrance to repel mosquitoes. The combination of the first and second heat-insulating layers reduces heat loss from the inside of the tent, improving insulation.

The application belongs to the technical field of pest detection, and is especially a sound detection device for detecting pests, which comprises a sound detector body, a lead wire installed on one side of the surface of the sound detector body, a connecting seat fixedly arranged at the end of the lead wire away from the sound detector body, a shell cover fixedly arranged on the surface of the lead wire and outside the connecting seat, the connecting seat being slidingly installed in the inner cavity of the shell cover, a sound detection terminal being fixedly arranged on one side of the surface of the connecting seat, and a protection assembly being installed on one side of the surface of the shell cover; the shell cover is abutted against the surface of a tree through the protection assembly, the push plate is pushed to move the sleeve plate A through the connecting block, the sound detection terminal is driven to approach the tree or contact the tree through the connecting seat, the shell cover can provide a closed space for the sound detection terminal at this time, external noise can be reduced, the sound detection terminal can be provided with sealing protection, and the risk of external leakage and damage of the sound detection terminal can be reduced.

The invention relates to the technical field of video monitoring, in particular to a remote video monitoring method, system and device capable of intelligently zooming, and the method comprises the steps: collecting a video of a to-be-monitored region and audio data of the position of monitoring equipment in real time through the monitoring equipment; obtaining a fuzzy coefficient of each time interval, wherein the fuzzy coefficient is used for evaluating the possibility that the fuzzy condition of the video image in each time interval is caused by noise; obtaining an influence degree coefficient of each time interval, wherein the influence degree coefficient is used for evaluating the possibility of image blurring caused by inconsistent depth of field of the video image in each time interval; and obtaining the external noise interference degree of each time interval, adjusting the filtering intensity of the video image in each time interval, and carrying out remote video monitoring on the to-be-monitored area. The invention aims to improve the image denoising effect by improving the evaluation precision of the possibility that the image is interfered by the real external noise, thereby improving the precision and reliability of remote video monitoring.

The utility model relates to the technical field of elevator door sealing strips, in particular to a high-sealing-performance elevator landing door soft and hard door sealing strip which comprises a connecting plate, a supporting plate is fixedly installed at the front end of the connecting plate, and a sealing mechanism is arranged outside the supporting plate. The sealing mechanism comprises a bearing pad, one supporting plate is sleeved with the bearing pad, a clamping groove is formed in the inner wall of the bearing pad, a buffering pad is embedded in the front end of the bearing pad, a buffering groove is formed in the buffering pad, the other supporting plate is sleeved with a sealing layer, and an inserting block is fixedly installed on the outer wall of the sealing layer. Through the connecting plate, the supporting plate, the bearing pad, the clamping groove, the buffering pad, the buffering groove, the sealing layer, the inserting block and the clamping groove, a gap of the elevator door can be closed when the elevator door is closed, the sealing performance is improved, external noise, dust, water vapor and the like are prevented from entering an elevator car, and therefore the comfort degree of the riding environment is improved.

The application discloses a noise recognition method and device, electronic equipment and medium. In the application, the optimal slope can be dynamically calculated from a plurality of candidate slopes and used as the slope of the deep residual shrinkage network, so that different optimal slopes of the soft threshold corresponding to the residual network can be selected to remove noise redundancy in the noise reduction process according to different noise signals. Thus, the response of the entire network model to external noise signals is improved, and the accuracy and precision of noise fault diagnosis are improved.

The invention relates to a manual noise reduction intelligent door and window system, and belongs to the technical field of intelligent doors and windows. The manual noise reduction intelligent door and window system comprises an outer frame, a window sash is hinged to the inner side of the outer frame, a positioning groove is formed in the surface of the window sash, and an intelligent noise reduction mechanism connected with the positioning groove in a clamped mode is installed in the outer frame in an embedded mode; the intelligent noise reduction mechanism comprises an annular frame embedded in the inner side of the outer frame, and an annular groove communicating with the positioning groove is formed in the inner side of the annular frame; external noise is collected in real time through the microphone, a built-in AI chip of the Internet of Things microcontroller analyzes noise spectrum and phase and generates reverse interference sound, and the loudspeaker emits sound waves to the noise direction for interference offset, so that structural sound transmission caused by vibration is effectively inhibited, and the problem that the resonance efficiency of an existing door and window sound barrier is remarkably reduced is solved. And the active noise reduction capability is improved.

Methods performed by a head-wearable audio output device are provided. The audio output device is worn on a head of a user and includes at least one sensor. The device uses the at least one sensor to detect a user activity based on motion of a body of the user. The device uses the at least one sensor to detect that an orientation of the head of the user is one of up or down. The device controls at least one of a level of attenuation applied to external noise or an audio output based on the detected user activity and the detected orientation of the head of the user.

The invention relates to a master-slave node time difference validity judgment method and device. The method comprises the following steps: acquiring time parameters in a time synchronization process of a master node and a slave node; calculating a current actual time difference value between the master node and the slave node based on the time parameter; calculating a current predicted time difference value of the master node and the slave node based on the time parameter; obtaining a current time difference deviation value based on the current actual time difference value and the current predicted time difference value; if the current time difference deviation value is smaller than a preset threshold, the current actual time difference value is judged to be effective, time difference kick caused by calculation errors, external noise and interference can be accurately recognized and filtered, and the problems that time frequency tracking loops of master and slave nodes fluctuate due to convex jump of an existing time difference calculation value, the larger the scene dynamics is, the larger the time difference calculation value is, the larger the time difference calculation value is, and the higher the time difference calculation value is, can be solved. And the time synchronization performance between the master node and the slave node is seriously influenced due to the larger fluctuation of the time frequency tracking loop.

The invention discloses an underwater positioning method based on Sage-Husa adaptive Kalman filtering. The underwater positioning method comprises the following steps: setting a planar ternary array to collect surface ship signals; calculating a pitch angle and an azimuth angle of the surface ship to the planar ternary array by adopting a time delay estimation method; calculating three-axis coordinates and speed of the surface ship under geodetic coordinates by adopting a coordinate rotation method; the coordinate position and the speed are corrected based on Sage-Husa self-adaptive Kalman filtering, and the stable ship position and the stable axial speed are obtained; a ship track is calculated in advance through a least square method, and the minimum distance between a surface ship and an observation point is predicted before the surface ship passes through the observation point. According to the method, the underwater working time of the system is effectively prolonged by reducing the number of array elements, and meanwhile precision loss caused by reduction of the number of the array elements is reduced through a time delay estimation algorithm; the time-varying adaptive Kalman filtering method based on Sage-Huge reduces the influence of external noise, and greatly improves the tracking capability when observation parameters change significantly.

This invention belongs to the field of communication noise detection and processing technology, and relates to a method and system for testing low-noise power supplies using waveforms. The method connects the power supply under test (DUT) and a voice gateway, and powers them on in real time. The voice gateway is connected to an external noise-shielded environment via its voice interface. Within this environment, the voice gateway is modulated to a periodic state of comfortable noise or a dial tone, and the sound is played. The playing sound is acquired and processed, and based on the processed sound and the sound signal waveform, the noise level of the DUT is detected in real time. This transforms uncontrollable human-induced noise into an electrical signal measurable by an oscilloscope, accurately determining whether the power supply meets requirements. In other words, by utilizing a clean environment, the unmeasurable power frequency noise on the telephone line is converted into a differential-mode signal measurable by an oscilloscope through a physical sound isolation process, providing testers with an objective experimental result.

The invention discloses a modular ceiling aluminum plate installation design structure, which belongs to the technical field of building decoration, and comprises a keel piece, a ceiling aluminum plate and a ceiling aluminum plate, the hanging piece is detachably connected to the keel piece; the ceiling modules are detachably connected to the hanging pieces; and the edge closing module is connected between the outer side ceiling module and the wall body. The problems that an existing aluminum ceiling is mostly installed through a plurality of bolts, so that the aluminum ceiling is inconvenient to install and disassemble, and meanwhile, due to the material and structural design and the like, the existing aluminum ceiling cannot effectively block external noise from being introduced and internal sound from being spread, and the service life of the aluminum ceiling is prolonged are solved. And the living experience feeling of the user is influenced.

Provided is a woven fabric that effectively prevents sound leakage to the outside and intrusion of external noise and has little variation in the acoustic property when used as a woven fabric for adjusting the back pressure of a speaker, earphones, and the like. Provided is a woven fabric including a warp thread and a weft thread, the woven fabric having a airflow resistance of 0.3 kPa·s / m or more and 5 kPa·s / m or less, and the woven fabric having a tolerance of the airflow resistance within ±10%. In the woven fabric, at least one of the warp thread and the weft thread is a multifilament thread. In the woven fabric, the multifilament thread is a non-twisted thread without twists.

The application provides a CMOS-MEMS integrated pressure sensor and a preparation process thereof. The pressure sensor comprises a bonded MEMS wafer and a CMOS wafer; a bonding sealing area and a PAD vertical interconnection structure in the bonding sealing area are arranged between the MEMS wafer and the CMOS wafer; the bonding sealing structure is formed by eutectic bonding of a metallization layer and a metal solder ball formed in corresponding bonding areas of the two wafers, and the bonding sealing structure surrounds a sensitive element to form a sealed cavity; the PAD vertical interconnection structure comprises conductive bumps respectively formed on the two wafers, the two conductive bumps are aligned with each other and bonded, and electrical interconnection between the MEMS wafer and the CMOS wafer is realized. The electrical interconnection of the pressure sensor realizes monolithic integration, not only improves the problems of increased signal transmission loss, reduced detection precision caused by additional parasitic resistance, capacitance and inductance introduced by wire bonding, and external noise interference, but also improves the service life and reliability, and reduces the size of the chip.

The application provides a launch vehicle second stage cabin section instrument equipment random vibration test condition prediction method: according to the time domain vibration response of the gimbal on the engine during the ground test of the newly researched launch vehicle second stage engine, the random vibration power spectral density at the position of the newly researched launch vehicle second stage cabin section instrument equipment is predicted and recorded as a first random vibration power spectral density; according to the total sound pressure level of the external noise at the position of the newly researched launch vehicle second stage cabin section, the random vibration power spectral density at the position of the newly researched launch vehicle second stage cabin section instrument equipment is predicted and recorded as a second random vibration power spectral density; the maximum envelope curve of the first random vibration power spectral density and the second random vibration power spectral density is drawn, a certain margin is considered, the envelope curve is converted into a broken line segment, and the second stage cabin section instrument equipment acceptance level random vibration test condition is obtained.

This system provides a DC insulation resistance monitoring system whose measurement results are less susceptible to external noise. [Solution] A DC insulation resistance monitoring system for a high-voltage distribution system, comprising: a neutral point switch for a grounded instrument transformer; an insulating capacitor switched on and off by the neutral point switch; a DC power supply for charging the insulating capacitor; a switch for switching the connection between the DC power supply and the insulating capacitor; and a voltage measuring unit for the insulating capacitor. The voltage measuring unit measures and holds the drift voltage Vd of the insulating capacitor, measures and holds the peak voltage Vp of the insulating capacitor, measures and holds the capacitor voltage Vt after a certain time t has elapsed since the DC power supply was turned off after charging the insulating capacitor with the DC power supply, calculates the voltage discharge time constant of the insulating capacitor as (Vp-Vd) / (Vp-Vt)×t, and calculates the insulation resistance R as T / c using the capacitance C of the insulating capacitor.

The invention discloses a differential ultrasonic transducer based on an acoustic differential method and a preparation method of the differential ultrasonic transducer. The differential ultrasonic transducer comprises a shell, a supporting layer, a backing layer, a bottom electrode layer, a top electrode layer and a piezoelectric unit layer. When external stress is received, acoustic differential signals with equal amplitude and opposite phases are output. The acoustic differential pair is creatively introduced into the piezoelectric unit layer, differential signals are generated from a physical source, external noise is effectively suppressed, and the signal-to-noise ratio is remarkably increased; the preparation method of the differential ultrasonic transducer is highly compatible with the process of a traditional transducer, and industrial production is easy to realize. The differential ultrasonic transducer is applied to a photoacoustic microscope system, and the imaging signal-to-noise ratio and contrast ratio in a complex electromagnetic and vibration environment can be remarkably improved under the condition of not depending on additional shielding or multiple averaging. The preparation process has the characteristics of high integration level and excellent anti-interference performance, and provides a reliable device basis for high-sensitivity photoacoustic imaging.