231results about How to "Solve the noise problem" patented technology

The invention provides statistically optimal near-field acoustical holography used for visual recognition of air-conditioner noise sources and an operation method thereof. The operation method comprises the followings: determining the positions, frequency characteristics and distribution ranges of the noise sources, and distance between microphones on microphone arrays, number, sample rates and number of sampling points of microphones; calibrating arrayed microphones; collecting data; recording sound pressure data; processing the sound pressure data; reading the processed data and finally entering noise source recognition procedures. By the invention, complex sound pressure on reconstructive surfaces and vibration velocity of surface particles can be calculated directly via linear superposition of the complex sound pressure on a holographic plane in a spatial domain, thus essentially overcoming window effects and wraparound errors existing in near-field acoustical holography and avoiding the problems brought about by the demand of a large number of microphones by near-field acoustical holography, such as low reconstruction efficiency of sound fields and costly cost of measuring systems, etc. The invention is characterized by small number of demanded microphones, low measuring cost and high reconstruction efficiency of the sound fields.

The invention relates to a bone-conduction headphone which comprises an upper cover (1) and a lower cover (2), wherein the upper cover (1) and the lower cover (2) can form a cavity (4) for containing a bone-conduction loudspeaker assembly (3) after closed; the bone-conduction loudspeaker assembly (3) is arranged in the cavity (4); the lower cover (2) is formed by one-step injection molding and is provided with a vibration plane (21); and the bone-conduction loudspeaker assembly (3) comprises a magnet (31), a coil (32) and a buffering ring (33), wherein the magnet (31) is fastened on the inner wall (211) of the vibration plane (21) of the lower cover (2), the buffering ring (33) is sheathed on the magnet (31) and is provided with the coil (32). The invention has the advantages of almost no noise, deep bass, simple structure and low cost.

A neural network based detection of noise-source in air conditioner is carried out by: extracting dynamic characteristics; training neural network; and detecting noise source in air conditioner. It has distributive and parallel processing, non-linear mapping, self-adapting and robust error tolerance so as to be widely used in pattern identification, control optimization, intellectual data processing and fault diagnosis. Noises generated from different parts of air conditioner are detected in mode of neural network to determine effectively where a main noise exists with high robustness and intelligence. It can be used for noisy faults diagnosis of air conditioner or some electric appliance so as to qualify them.

The present invention discloses an image processing device and method, and belongs to the field of image processing technology. The device includes: a sliding module, used to slide in an image in Bayer format to be processed by using an M*N sliding window; a read module, used to read a pixel value of a center pixel point when the center pixel point in the sliding window is a green pixel point; a calculating module, used to calculate a symmetric value of the pixel value of the center pixel point according to the sliding window; a determining module, used to determine an equilibrium output value of the center pixel point according to the pixel value and the symmetric value of the center pixel point; and a generating module, used to generate a processed image according to the equilibrium output value of each green pixel point in the Bayer image to be processed. The problem existing in the background technology, i.e., noise exists in the image due to crosstalk between adjacent pixel points in the image in the Bayer format obtained by Bayer array filtering, is solved; and influences of the crosstalk between the adjacent pixel points in the image are reduced; and the image display effect is improved.

The invention provides a DC small current constant-current source and a method for adjusting the constant-current source and aims at solving the problem of the noise of the output current caused by the noise of an amplifier in a feedback circuit of the existing DC small current source. The DC small current constant-current source comprises a voltage source, a differential amplification circuit, a V/I conversion circuit, a current output terminal and a feedback circuit; the voltage source is connected in series with the differential amplification circuit and outputs voltage to the differential amplification circuit; the differential amplification circuit is connected in series with the V/I conversion circuit; the V/I conversion circuit generates the current and outputs the current by the current output terminal; the feedback circuit comprises a sampling circuit and a filter circuit which are connected in series; after sampling at the output current terminal of the V/I conversion circuit, the sampling circuit outputs the voltage signal which is fed back and filtrated by the filter circuit to the input terminal of the differential amplification circuit. Meanwhile, the output voltage of a feedback branch is taken as the following output voltage of the current output terminal. The invention can provide the DC small current with high precision.

The present invention provides a magnetic levitation transferring system which comprises the following components: a loading unit which is loaded with object; a body transferring unit while the loading unit is coupled to the body transferring unit at one side; a rail which forms a line for transferring the body transferring unit; a levitating unit which is connected with the body transferring unit and causes the body transferring unit to levitate to a preset height relatively to the rail; a pushing unit which is connected with the body transferring unit and provides a pushing force for transferring the body transferring unit levitated by the levitating unit along the line of the rail; and a non-contact power source which receives power through a non-contact mode and supplies power for at least one in the levitating unit and the pushing unit. Through the configuration, a magnetic levitation technique is adopted in transferring object as one of the non-contact techniques thereby settling the problems of assembly damage caused by wearing and abrasion, noise generation and particle generation. Furthermore the power is supplied stably and safely while the object is transferred with a high speed.

The invention belongs to the technical field of microelectronics, and particularly relates to a silicon-based CMOS image sensor and a method for improving electron transfer efficiency of the silicon-based CMOS image sensor. According to the silicon-based CMOS image sensor and the method for improving the electron transfer efficiency of the silicon-based CMOS image sensor, due to the fact that increasing doping from the interior to the surface is led into the portion where a light sensing area makes contact with a transfer transistor (TX) channel area, the electric potential is gradually increased from the interior of a substrate to the TX surface channel, photon-generated carriers can be completely transferred, the theoretical limit of the number of the transferred carriers can be met, and the problem of noise caused by incomplete transfer of the photon-generated carriers is successfully solved.

The invention discloses a transmitting end, a receiving end, a system and a method for power line communication of a contact network and belongs to the technical fields of railway communication and urban rail communication. The transmitting end comprises the following modules including an application layer encoder, a physical layer encoder and a physical layer modulator, namely an OFDM (Orthogonal Frequency Division Multiplexing) modulator, wherein the application layer encoder is used for receiving source information and providing an encoding data stream; the application layer encoder comprises a CRC (Cyclic Redundancy Check) encoding and fountain code coding cascade; the physical layer modulator is used for receiving a data stream of the application layer encoder and has functions of forward error correcting and encoding; and the physical layer modulator is used for receiving a data stream of the physical layer encoder and generating an output signal by using an OFDM modulation mode. The invention further discloses a corresponding receiving end, a system and transmitting and receiving methods. Due to the combination of a fountain code cross-layer technology, a physical layer channel encoding and OFDM modulation technology, the problem of five kinds of noises of general power line communication is solved; and particularly due to the adoption of the fountain code cross-layer design, the problem that the on-off of a contact network channel and a current collector are intervened by electric spark pulse noise of the contact network is solved.

The invention discloses a partial discharge positioning device and method for a power equipment inspection unmanned aerial vehicle. The device comprises a partial discharge detection device which is installed on the unmanned aerial vehicle and comprises an antenna, an electromagnetic signal conditioning circuit, an ultrasonic sensor, an ultrasonic conditioning circuit, an analog-to-digital conversion circuit, a microprocessor, an airborne WiFi communication module and a power supply; and a ground portable computer which is used for receiving the detection result information processed by the microprocessor for storage and display and can control the partial discharge detection device. The device can quickly evaluate the insulation state of the 10 kV overhead insulated wire, solve the problem that the unmanned aerial vehicle of the 10 kV overhead insulated line cannot determine the partial discharge position information quickly in the course of inspection, improve the anti-noise abilityof the system and avoid the use of expensive ultrasonic arrays and antenna arrays. The device also has the advantages of small size and low weight and is easy to install on the unmanned aerial vehicleand has great engineering practical value.

The invention discloses a design method of a variable-structure controller for double teleoperation with the feature of time-varying delay. Conventional impedance control is adopted by a master terminal. Variable structure control is adopted by a slave terminal. When a variable-structure controller at the slave terminal is designed, the method of integrating errors is adopted in order to decrease a noise problem caused by differential terms and serves as a sliding mode function. The design method of the variable-structure controller for double teleoperation with the feature of time-varying delay has following beneficial effects: a sliding mode controller is reasonably selected in order to reduce negative impact of time delay to a great extent; meanwhile, the sliding mode controller is not required to determine concrete value of time delay so that the noise problem caused by derivation of the sliding mode function is avoided; furthermore, fine robustness and stability are obtained without influence of changes and time delay; and the requirement for a double teleoperation system featuring time-varying delay can be satisfied.

The invention relates to a prediction method for an influence of an interior part on vehicle sound insulation and sound quality. The prediction method comprises the following steps: step 1, adjustingthe working condition of the vehicle; step 2, arranging a sensor; step 3, collecting noise in the vehicle under various working conditions; step 4, checking the consistency of data; step 5, processingand analyzing the noise data; step 6, obtaining virtual "digital interior part"; and step 7, predicting the noise level of the tested vehicle. According to the prediction method for influence of interior part on vehicle sound insulation and sound quality, the final sound insulation level of the complete prototype in the early stage of vehicle development can be predicted, the research and development costs can be reduced, and the development efficiency of the vehicle can be improved.

The invention relates to the field of intelligent power grids, in particular to a multi-station fusion system operation situation anomaly monitoring and alarm merging method, which comprises the stepsof training an anomaly detection model based on historical data of a power multi-station fusion system, and determining an abnormal value threshold; obtaining time sequence data of the operation situation of the power multi-station fusion system in real time, inputting the processed time sequence data into a trained anomaly detection model to obtain an anomaly score of the data, comparing the anomaly score with an anomaly value threshold, and determining anomaly information; based on the historical alarm data information, mining the correlation between the alarm information, and determining an association rule; and determining the category and the emergency degree of the anomaly information, generating corresponding alarm information, and completing combination and output of the alarm information based on the association rule. According to the invention, combination and output of alarm information are realized, and effective detection of anomaly data in time series data in operation and maintenance of the power multi-station fusion system is realized.

The invention discloses a face detection tracking method and device. The method comprises: acquiring a to-be-detected image and a target face image; detecting and describing feature points in the to-be-detected image and the target face image; matching feature points in the to-be-detected image and the target face image according to detection and description results; and performing face detectionand tracking according to a matching result. According to the method, the problem of accumulation during feature point extraction and the problem of noise during feature point description in an existing face detection tracking method are solved, and the face detection tracking accuracy is improved.

The invention discloses a full decoupling steering-by-wire system. The full decoupling steering-by-wire system is used for solving the problems that a motor in a traditional EPS is large in noise, andthe function of steering full decoupling needed by an intelligent automobile cannot be achieved; mechanical connection between a steering wheel and a steering wheel is omitted in parts of steering-by-wire systems, and consequently, efficacy-losing steering cannot be completed when the systems are powered off and lose efficacy; when the parts of the steering-by-wire systems adopts motors as steering-by-wire power sources, the noise is large, and the response speed is low; and when the parts of the steering-by-wire systems adopts liquid or gas as a steering medium, leakage occurs, the failure rate is increased, and maintenance is difficult. According to the full decoupling steering-by-wire system, electromagnetic force is adopted to drive a steering rod to move, so that an automobile completes a steering action rapidly and precisely; and the full decoupling steering-by-wire system can achieve full decoupling of a driver and the steering system, has the efficacy-losing protection function, and is free from constraints of the motors, the liquid and the gas, simple in structure and high in integration level.

The invention discloses a method for measuring laser linewidth of an ultra-narrow linewidth laser. The method is creatively characterized in that by use of an automatic heterodyne detection system, a power spectrum of the ultra-narrow linewidth laser under an automatic heterodyne conduction is obtained; and a peak and a valley which are adjacent to each other in terms of positions are selected from an area beyond high-peak pulses on the power spectrum, a difference delta S between the contrast of the peak and the valley on the power spectrum are respectively calculated, and the laser linewidth delta f is calculated according to the delta S. The method for measuring the laser linewidth of the ultra-narrow linewidth laser, brought forward by the invention, has the following technical advantages that the method can realize measurement of ultra-narrow linewidth under the condition of quite short delay fibers, greatly reduces hardware demands, can effectively prevent the problem of noise brought by large-length delay fibers and is quite good in measurement precision.

The invention provides a new energy vehicle and an automatic acoustic system and an automatic acoustic control method thereof in order to solve the problems that in the prior art, only low-frequency noise or high-frequency noise needs to be eliminated, the processing mode is not comprehensive enough, and the sound quality of the sound environment still needs to be further improved. The automatic acoustic control method comprises the following steps: acquiring a noise signal in a sound environment of a new energy vehicle, generating a harmony structure signal according to the high-frequency noise signal, according to the low-frequency noise signal, generating a phase de-noising signal which is inversely equal to the low-frequency noise in amplitude, playing the harmony structure signal, playing a noise reduction structure sound fused with the high-frequency noise in the new energy vehicle sound environment so as to perform noise reduction processing on the high-frequency noise, and playing the phase de-noising signal which is inversely equal to the low-frequency noise in amplitude so as to eliminate the low-frequency noise. According to the automatic acoustic control method providedby the invention, no matter what working conditions are in the vehicle, a driver and passengers have a very high-quality sound quality environment.

The invention discloses an entity relationship extraction method based on an improved deep residual network and a relationship word attention mechanism, which comprises the following steps: convertingEnglish into a word vector by processing a remote supervision entity relationship data set; obtaining relation words, and calculating cosine similarity to extract relation word weights of sentences;respectively introducing a segmentation mechanism and a gating mechanism to form a segmented residual error network with a gate module, and segmenting the characteristic channel by adopting the segmented gating residual error network; splicing the average pooling layer on the basis of the maximum pooling layer at the rear section of the residual network to form a double-pooling layer, wherein thedouble-pooling layer is used for reserving sentence structure features; obtaining final sentence features of the model; and performing relationship classification on the obtained sentence features toobtain an output entity relationship. According to the method, the deep residual error network is applied to a remote supervision data set of relationship extraction, the noise reduction capability ofthe model is effectively improved by deepening the number of network layers, and meanwhile, a segmented gating residual error module is provided, so that the performance of the deep residual error network is effectively improved.

The invention discloses a ventilation louver with adjustable resistance and noise reduction, which includes a louver frame and noise-eliminating blades. The ventilation louver also includes a sensor and a control terminal. The sensor is arranged on one side of the louver frame to detect temperature and /or changes in wind power, and the sensor is electrically connected to the control terminal, and the control terminal is electrically connected to the sound-absorbing blade. The invention can satisfy the air inlet pressure loss and noise reduction performance of the equipment, and simultaneously has the effects of achieving low carbon, environmental protection and energy saving.

The invention discloses a drive-by-wire hydraulic braking system using a liquid high pressure source generator, and belongs to the technical field of vehicle drive-by-wire brake. The problems that a power assisting form of an existing brake system mostly depends on the vacuum degree of an engine, so that the existing brake system cannot be applied to an electric vehicle; when parts of drive-by-wire brake systems adopt a motor to assist power and brake a main cylinder or an auxiliary main cylinder directly, noise is large, and the responding speed is low; when the parts of drive-by-wire brake systems adopt the motor to drive a pump to supply liquid to a high pressure energy accumulator, damage to the braking system by pulsation with internal pressure is large, and the life of the high pressure energy accumulator is limited, so that frequent replacing is required are solved. The drive-by-wire hydraulic brake system is a mechanical device which uses electromagnetic force to drive a pistonto move and continuously produce the high pressure brake fluid, so that the drive-by-wire brake system is free from shackle of a vacuum power booster, the motor, the pump and the high pressure energyaccumulator, the structure is simpler, the integration degree is higher, and meanwhile the drive-by-wire brake system has the functions of fast active pressure buildup, accurate pressure adjusting, low vibration noise, failure protection, full decoupling of pedal force and the like.