146 results about "Reference noise" patented technology

The invention discloses a pattern recognition type metal pipeline anticorrosive coating quality detection device and system, belongs to the technical field of sensing monitoring, and aims to solve the problems of low detection precision and difficulty in positioning of damaged points of a metal pipeline anticorrosive coating under the interference of a complex environment. The method comprises the following steps: generating an environmental interference spectrum feature library through full-range frequency band pre-scanning, dynamically establishing a reference noise level, screening candidate frequencies of detection signals, and switching the frequencies as required to guarantee signal quality; synchronously acquiring a potential gradient and an electromagnetic radiation signal, and marking space-time coordinates; performing deep processing on the acquired signals, separating multi-frequency signals, correcting attenuation, and constructing a multi-dimensional feature vector; based on the feature vector, a space-time abnormal mode is extracted to position a damage point, through damage type classification, region area measurement and depth evaluation, the damage severity is quantified, accurate data support is provided for pipeline maintenance, and the accuracy and reliability of metal pipeline anticorrosive coating detection are effectively improved.

The invention provides a noise reduction method and device, equipment and a medium, weighting processing is performed on a first time domain reference noise signal vector to obtain a second time domain reference noise signal vector, a sampling point closer to the current moment is endowed with a higher weight, the noise reduction performance is optimized, and the noise reduction performance is improved by updating a weight coefficient and the second time domain reference noise signal vector. Therefore, the noise cancellation signal is determined on the time domain, filtering on the time domain is realized, the noise cancellation signal is generated to carry out noise reduction processing on the primary noise in the target noise reduction area, extra time delay caused by frequency domain filtering is avoided, noise reduction time delay is reduced, and the filtering effect is improved. The updating process of the weight coefficient is completed in the frequency domain, updating is achieved in the frequency domain with smaller blocks, the calculation amount is reduced, the interval time of noise reduction processing is shortened, the calculation efficiency of the algorithm is improved, the processing delay is reduced, and the noise reduction effect is improved.

The invention relates to the technical field of audio processing, in particular to an audio optimization method and device based on artificial intelligence, computer equipment and a medium. According to the method, a linear layer is used for mapping a spectrum envelope of a to-be-optimized audio to obtain an envelope feature, an embedding layer is used for embedding a standard audio parameter into a parameter feature, a prediction model is used for predicting a fusion feature of the envelope feature and the parameter feature to obtain a prediction pitch curve, and a noise adding model is used for adding noise to a Mel spectrum of the to-be-optimized audio to obtain a predicted pitch curve. Calculating the noise of the noise addition result by using a noise estimation model to obtain predicted noise, updating the noise estimation model according to the predicted noise, the real noise and the predicted pitch curve, calculating the reference noise of the noise addition result by using the updated noise estimation model, and de-noising the noise addition result according to the reference noise. The noise estimation model is optimized in combination with pitch information, so that the denoising process meets the pitch requirement, and the audio optimization effect is improved.

A reference noise cancellation device for a transient electromagnetic field is provided. The device includes a transmitter, a transmitting loop, a reference coil, a signal coil and a receiver. The transmitter generates a measurement timing sequence to trigger the receiver to synchronously record the induction signal in the signal coil and the electromagnetic noise in the reference coil. A bipolar current waveform is generated and is injected into the transmitting loop through the first connecting line. The signal coil receives an induced magnetic field of an underground conductor and surrounding magnetic field noise. The reference coil receives surrounding electromagnetic noise. The receiver receives and records the induced magnetic field and surrounding electromagnetic noise of the underground conductor in the signal coil and the surrounding electromagnetic noise in the reference coil.

An operating method of a wireless communication device includes: receiving a reference signal transmitted from a second wireless device; calculating a reference noise value based on the reference signal; calculating, by the processor, a noise threshold value based on the reference noise value; receiving a first data signal transmitted from the second wireless device; calculating a data noise value based on the first data signal; comparing, by the processor, the data noise value with the noise threshold value; determining whether interference occurs in a target symbol based on a result of the comparison; adjusting the noise threshold value based on the data noise value when it is determined that the interference has occurred in the target symbol; and receiving a second data signal transmitted from the second wireless device, and using the adjusted noise threshold value in processing the second data signal.

The invention discloses a track acoustic signal noise reduction method and device, and relates to the technical field of track traffic, and the method comprises the steps: processing a track acoustic signal through short-time Fourier transform, obtaining a full-frequency-band energy value of the track acoustic signal corresponding to each moment in different moments, and obtaining a full-frequency-band energy value of the track acoustic signal; and calculating the proportion of the energy of the corrugation characteristic frequency band at each moment and the sum of the full-frequency-band energy of the orbit acoustic signal at the same moment. According to the method, the proportion of the energy of the common frequency band of the corrugation signal and the sum of the energy of the full frequency band of the track acoustic signal at the same moment is used as the weight of the acoustic signal excited by the driving-track to reduce irrelevant noise, so that the defect of voiceprint feature loss caused by methods such as a digital filter and wavelet threshold noise reduction can be effectively avoided; and the defect that music noise is generated when reference noise is adopted for noise reduction in a traditional spectral subtraction method can be effectively overcome, and the purpose of reducing noise to highlight track corrugation characteristics can be achieved on the premise that it is guaranteed that track acoustic signal voiceprint characteristics are not lost.

The invention provides an active noise reduction method capable of restraining divergence and a microphone vibration reduction device, belongs to the technical field of automobile active noise reduction, and detects the sealing condition of a cab through automobile door sensors, automobile window sensors and skylight sensors. If the microphone is closed, noise signals are collected by using errors on the microphone vibration damping device and a reference microphone, and secondary noise signals are generated by an active noise reduction filter and are played by a loudspeaker; if yes, the engine rotating speed in the vehicle CAN signal is read, and a reference noise signal is generated and played. A cab sealing state and an active noise reduction system operation state are displayed on an instrument panel, and the operation state is determined according to noise signal acquisition and noise reduction signal playing conditions. The noise reduction mode can be automatically switched according to the cab sealing state, the noise in the vehicle is effectively reduced when the cab is sealed, the reference noise is reasonably played when the cab is opened, and the influence on the robustness of a system filter is reduced. Related information is displayed on the instrument panel, so that a user can visually know the cab state and the system operation condition.

The invention relates to the field of optical fiber sensing, in particular to a DAS-based audio data acquisition method and system, electronic equipment and a storage medium. Acquiring real-time audio data and real-time energy of the to-be-measured optical cable at the current sampling time point; updating the reference noise threshold value through the reference energy in the real-time audio data; acquiring a starting point of an effective signal in the real-time audio data according to the real-time energy and the updated reference noise threshold value, and amplifying the real-time audio data collected behind the starting point; and taking the amplified real-time audio data as effective audio data. Compared with the prior art, the method has the advantages that the reference noise threshold value containing the system noise is obtained, the reference energy containing the external noise is used for updating the reference noise threshold value, then the effective signal can be obtained based on the updated reference noise threshold value and the real-time energy, calculation is simple, and no complex algorithm or extra hardware is needed.

The invention provides an automobile expected working condition noise simulation method and system based on reference noise matching, and relates to the technical field of noise simulation. The method provided by the invention comprises the steps of performing feature extraction on reference noise data to obtain reference noise features of each reference vehicle type under each original working condition; inputting the sound field influence factors of the vehicle type to be detected into a pre-trained target model to obtain predicted noise features output by the target model; comparing the predicted noise feature with each reference noise feature to obtain a target reference vehicle model matched with the to-be-detected vehicle model; and in a noise playback cavity matched with the to-be-tested vehicle model, playing back reference noise data of the target reference vehicle model under the expected working condition. According to the method, a main engine plant can simulate and evaluate noise characteristics in an early stage, so that design changes caused by noise problems are reduced.

The invention discloses a multi-mode composite fault diagnosis method and system for a variable-frequency asynchronous motor. The method comprises the following steps: synchronously acquiring a vibration acceleration signal X, a rotating speed signal R and a current signal D of the variable-frequency asynchronous motor; performing adaptive noise reduction on the vibration acceleration signal X by using a rotating speed driven harmonic wavelet packet-variational mode decomposition method to obtain a reconstructed signal Y; filtering the current signal D through dual-mode collaborative filtering and soft reference noise, and outputting a noise reduction signal S through dual-channel fusion processing; extracting a pass frequency speed effective value and an acceleration kurtosis from the reconstructed signal Y, and extracting a current effective value, a peak coefficient, a degradation coefficient and a harmonic distortion sequence from the noise reduction signal S; vibration, rotating speed and current characteristics are fused to set expert mechanism model rules, and fault types are output according to the rules. The early weak fault sensitivity can be improved, and accurate, real-time and automatic early warning of composite faults such as bearing damage, rotor bar breakage and air gap eccentricity under complex working conditions can be realized without manual intervention.

The invention discloses a video pulse wave extraction method and system based on automatic noise recognition. The method comprises the steps that a face area is divided into a plurality of sub-areas; calculating the signal-to-noise ratio of each sub-region in the pulse frequency band, and performing weighted fusion on the original pulse signals of each sub-region according to the signal-to-noise ratio; performing ensemble empirical mode decomposition on the fusion signal; according to the peak-to-peak interval variation coefficient, the amplitude stability index and the spectrum purity, determining a noise component dominated by the motion artifact; performing adaptive filtering processing on the fused signal by using an adaptive filter and taking a reference noise signal as input; carrying out distortion detection on the filtered fusion signal, and carrying out signal restoration processing on a detected distortion region to obtain an extracted pulse signal; in order to solve the problem that in the prior art, when video pulse signals are extracted, motion artifacts and physiological signal frequency spectrums are overlapped, and consequently signal separation of a traditional frequency domain filtering method fails, effective signal separation and accurate pulse signal extraction are achieved.

The invention provides a speech enhancement method based on BGRU and reference noise, which comprises the following network structures: during reasoning, receiving two paths of input: reference noise and noisy speech, inputting the two paths of noise into an enhancement network module through a short-time Fourier transform encoder respectively to obtain noise estimation and speech estimation, performing inverse short-time Fourier transform on the voice estimation to obtain voice after noise reduction; during training, four paths of input including reference noise, noisy voice, noise truth value and voice truth value are received, the four paths of noise respectively pass through the short-time Fourier transform encoder, and the encoded reference noise and noisy voice are calculated through the enhancement network module to obtain noise estimation and voice estimation; and the encoded voice truth value, noise truth value, noise estimation and voice estimation are all sent to a 3CL loss module, loss is calculated and fed back to the enhanced network module, parameters are adjusted, and the performance of the enhanced network module is improved. According to the invention, the voice quality and intelligibility can be improved under the condition of extremely low signal-to-noise ratio.

The invention provides a speech synthesis model training method, a speech synthesis method, a speech synthesis device and speech synthesis equipment, and belongs to the technical field of computers. The first speech synthesis model comprises a language network and a diffusion network; the method comprises: processing a sample text and a sample audio through a language network to obtain a first audio feature, the sample text and the sample audio being consistent in content, the first audio feature comprising a content feature of the sample text and an acoustic feature of the sample audio; performing noise prediction on the sample audio added with the reference noise based on the first audio feature through a diffusion network to obtain predicted noise; determining a first training loss based on the reference noise and the predicted noise; and updating parameters of a language network and a diffusion network in the first speech synthesis model based on the first training loss to obtain a second speech synthesis model. According to the technical scheme, the purpose of end-to-end training of the speech synthesis model is achieved, the training steps are simplified, and the training efficiency of the model is improved.

The invention discloses a low-noise low-power-consumption cascade input comparator which comprises a pre-amplification stage and a latch stage, the pre-amplification stage is used for amplifying a pair of differential signals input from the outside, the amplified differential signals are obtained and output to the latch stage, and the latch stage is used for latching the amplified differential signals. The latch stage is used for keeping a latch state and outputting a differential comparison result, the pre-amplification stage is used for inputting a pair of differential signals by arranging a three-stage cascade structure consisting of three pairs of input geminate transistors, and is used for preventing all connection nodes of the pre-amplification stage and the latch stage from being completely discharged to the ground by arranging a pair of cross coupling geminate transistors, so that charge storage is realized; the circuit has the advantages of low input reference noise, no consumption of a large amount of extra area and power consumption, small area and low power consumption.

The present invention discloses a high-temperature superconducting quantum voltage noise thermometer, comprising a detector resistor, a high-temperature superconducting quantum voltage pseudo-noise source, a switch conversion circuit, two-way amplification and filtering circuits, and a data acquisition and processing circuit; the input end of the switch conversion circuit is electrically connected to the output end of the detector resistor and the high-temperature superconducting quantum voltage pseudo-noise source respectively, and the output end is electrically connected to the amplification and filtering circuit and the data acquisition and processing circuit in sequence; the data acquisition and processing circuit comprises two analog-to-digital converters and a cross-correlation data processing circuit, and the input end of each analog-to-digital converter is electrically connected to the output end of one amplification and filtering circuit. The present invention adopts a high-temperature superconducting quantum voltage noise source device based on a pulse-driven high-temperature superconducting Josephson array as a reference noise source, can work in a liquid nitrogen temperature zone, has low refrigeration cost, small size, short refrigeration time and low power consumption, and can realize temperature in-situ calibration under special environments.

The present application relates to the technical field of compression spring resonance frequency detection, and specifically relates to a compression spring resonance frequency detection method and system, the method comprising the following steps: collecting a mixed vibration signal of a compression spring to be measured; collecting a background noise signal of a test device as a reference noise signal; collecting a synchronous signal of a specific noise source of the test device; performing adaptive noise cancellation processing on the mixed vibration signal, the adaptive noise cancellation processing performing initial parameter training using the reference noise signal and using the noise source synchronous signal as a real-time reference input to separate a pure vibration response signal of the compression spring to be measured; performing frequency spectrum analysis on the pure vibration response signal; identifying a wideband vibration response region of the compression spring to be measured, the wideband vibration response region having a continuous amplitude higher than a preset energy threshold and having a specific width; calculating a characteristic parameter of the wideband vibration response region; and judging a degradation state of the compression spring to be measured according to the characteristic parameter. The above improves the accuracy of degradation judgment.

The present invention discloses a model training method and correction method for infrared image non-uniformity correction. The training method comprises: obtaining training data and blackbody calibration data based on the same infrared detector, and obtaining real noise data corresponding to different calibration temperatures based on the blackbody calibration data; inputting the training data into a non-uniformity correction network to perform non-uniformity correction, thereby obtaining a global noise image and a corrected output image; inputting the corrected output image into a semantic segmentation network to perform grayscale segmentation, thereby obtaining a plurality of grayscale regions; finding the calibration temperatures corresponding to the different grayscale regions based on the blackbody calibration data, and splicing the real noise data at the calibration temperatures by region to obtain a reference noise image; and calculating the loss function of the non-uniformity correction network to adjust the network parameters and obtain a trained non-uniformity correction network model. The model trained by this method can effectively remove non-uniformity noise in infrared images over a wide temperature range.

The invention relates to a method for monitoring a work process, comprising the steps of: acquiring audio data by means of a recording unit and forwarding the audio data to a signal-processing unit; transforming the acquired audio data into the frequency range within a specified bandwidth B by means of the signal-processing unit; creating a spectrogram by spectral analysis, for example by applying a Fourier transform; forwarding the spectrogram to a data-processing unit; identifying at least one type of noise in the spectrogram by means of the data-processing unit by comparing the spectrogram with multiple predefined reference noises stored in a memory; marking, by means of the data-processing unit, the point in time at which the noise type was identified in the spectrogram; allocating the identified noise type to the marked point in time by means of the data-processing unit and creating an electronic allocation table; comparing, by means of the data-processing unit, the created allocation table with at least one reference table stored in a memory; and outputting a data signal by means of the data-processing unit if, when comparing the allocation table with the reference table, a deviation is detected which exceeds a threshold value.

The invention relates to a metal pipeline corrosion nondestructive monitoring method, device and equipment and a medium. The method comprises the following steps: acquiring high-frequency eddy current data, low-frequency eddy current data and reference noise data of a pipeline; based on the reference noise data, performing adaptive noise removal and modal decomposition on the high-frequency eddy current data and the low-frequency eddy current data to obtain an intrinsic corrosion characteristic signal; the intrinsic corrosion characteristic signal comprises a high-frequency intrinsic corrosion characteristic signal and a low-frequency intrinsic corrosion characteristic signal; performing multi-band feature extraction on the intrinsic corrosion feature signal to obtain a fusion feature vector; and carrying out inversion on the fused feature vector to obtain corrosion depth distribution data. By adopting the method, the corrosion characteristics of the deep and shallow layers of the non-ferromagnetic metal pipeline can be monitored at the same time, and the false detection rate of the deep corrosion condition in a strong interference environment is reduced.

The application provides a high-density surface electromyography signal hardware filtering device and method based on FPGA, comprising: an sEMG signal input module for collecting multi-channel noisy surface electromyography signals and at least one reference noise signal; an LMS adaptive filtering calculation module for receiving the noisy surface electromyography signals and the reference noise signal, adopting a fixed-point number operation system and executing an LMS adaptive filtering algorithm through a parallel pipeline structure to output a filtered error signal; a data buffer and output interface module for buffering and outputting the filtered surface electromyography signals; and an FPGA main control module connected with the sEMG signal input module, the LMS adaptive filtering calculation module and the data buffer and output interface module for controlling the work of each module. The application realizes the LMS adaptive filtering algorithm on the FPGA platform, and solves the problems of insufficient real-time performance and large processing delay of software filtering when facing high-density multi-channel sEMG signal processing.

The invention relates to the technical field of intelligent sensing systems, and discloses a method and a device for detecting the bearing capacity of a pavement engineering construction material, and the method comprises the steps: synchronously collecting a mixed signal and a pure noise signal through a main measurement sensor and a reference noise sensor, constructing a multi-dimensional observation matrix, and carrying out the centralization and whitening preprocessing, thereby obtaining the bearing capacity of the pavement engineering construction material. And blind source separation is carried out by adopting an independent component analysis algorithm based on maximized non-Gaussian property, a target bearing capacity response signal with a super Gaussian characteristic is identified according to a kurtosis value of each source signal component, and then a dynamic deformation modulus is calculated. The system comprises a sensor array module, a synchronous acquisition module, a data processing module based on FPGA hardware acceleration and a result output storage module. According to the invention, strong coherent vibration noise can be effectively suppressed, signal details are completely reserved, and high-precision and real-time bearing capacity detection is realized.

The invention provides an active noise control method, device and system, and the method comprises the steps: collecting a reference noise signal, and collecting an error noise signal; separating a feedforward error signal and a feedback error signal from the error noise signal based on a processing signal of a self-adaptive filter in the error separation system on the reference noise signal; the filtering parameter of the adaptive filter is updated based on the maximum correlation entropy between the processed signal and the noise residual signal after noise reduction of the reference noise signal. While the noise reduction effect is ensured, errors caused by coupling between the feedforward control system and the feedback control system are avoided, and the convergence effect of the system is effectively improved.

The embodiment of the invention provides a video generation method, computing equipment, a computer readable storage medium and a computer program product, and the video generation method comprises the steps: receiving a video generation instruction, and generating an initial prompt text according to the video generation instruction; obtaining a reference noise pattern group, inputting the reference noise pattern group and the initial prompt text into a first video generation model, obtaining a reference video generated by the first video generation model, and obtaining a target video feature information set generated by the first video generation model in the process of generating the reference video; receiving a video adjustment instruction, and generating a target prompt text according to the video adjustment instruction and the initial prompt text; and inputting the reference noise graph group, the target prompt text and the target video feature information set into a second video generation model to obtain a target video generated by the second video generation model. The target video is generated through the target video feature information set generated in the reference video generation process, so that the video editing accuracy is improved.

The application relates to a vehicle sealing performance detection method and device, a vehicle, a storage medium and a product. The method comprises the following steps: acquiring original acoustic signals collected by a main microphone array arranged in a to-be-detected area of a vehicle and reference noise signals collected by a reference microphone array arranged in a reference area of the vehicle; performing background noise filtering processing on the original acoustic signals based on the reference noise signals to obtain target acoustic signals; extracting target acoustic features corresponding to the target acoustic signals; determining a feature similarity between the target acoustic features and reference acoustic features corresponding to a current running state of the vehicle; and in a case where the feature similarity is smaller than a similarity threshold, determining a sealing performance detection result of the to-be-detected area according to the target acoustic features. The method can continuously and comprehensively detect the sealing performance of the vehicle during driving.

The embodiment of the invention discloses a model training method and device, a multimedia resource generation method and device and computer equipment. The method comprises the steps that multimedia features and text features are acquired; in the first training stage, training parameters are adopted, and a to-be-trained multimedia generation model is trained at least once based on the text features, the first noise-added multimedia feature set and the first reference noise feature set, so that a pre-trained multimedia generation model is obtained; and in a second training stage, training the pre-trained multimedia generation model for multiple times by adopting the compressed training parameters based on the text features, the second noise-added multimedia feature set and the second reference noise feature set to obtain a trained multimedia generation model. In this way, the effect of generating multimedia through the multimedia generation model can be improved.

The invention provides a multi-channel synchronous sampling system for weak current detection and a control method thereof. According to the method, a low-noise trans-impedance amplifier array is used for converting multiple paths of weak current signals into multiple paths of analog voltage signals; at least one reference channel for outputting reference noise data; the synchronous analog-to-digital conversion array is used for synchronously sampling the multi-path analog voltage signals and the reference noise data after receiving the global conversion starting signal sent by the field programmable gate array, and converting the multi-path analog voltage signals and the reference noise data into multi-path synchronous first digital data to be output; the field programmable gate array is used for receiving the first digital data and carrying out delay compensation and amplitude correction on the first digital data to obtain multiple paths of time-aligned and amplitude-normalized second digital data; and a filter for referencing the first digital data converted from the reference noise data and eliminating the common-mode noise component in the second digital data to output purified third digital data.

The present application provides a signal processing method and a related apparatus. The method comprises: acquiring N quantized audio features of raw non-speech audio, wherein N is a positive integer greater than or equal to 1; determining a first predicted silence audio feature based on the N quantized audio features and reference noise; and determining, based on the first predicted silence audio feature and a first neural network, first non-speech audio corresponding to the raw non-speech audio.

The invention provides a model training method and device, an image generation method and device, electronic equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring a plurality of sample data pairs, and predicting first noise of a target object under a first light source and second noise of the target object under a second light source through a to-be-trained image generation model; based on the first noise and the second noise, through a to-be-trained image generation model, determining fusion noise of the target object under the first light source and the second light source; determining reference noise of the target object under the first light source and the second light source, and determining a loss value corresponding to the sample data pair based on the fused noise and the reference noise; and training a to-be-trained image generation model based on the loss value corresponding to each sample data pair. According to the invention, the training efficiency and accuracy of the model can be improved, and the quality of the image generated by the trained image generation model is improved.

This invention provides an active noise cancellation method and microphone vibration damping device that suppresses divergence, belonging to the field of automotive active noise cancellation technology. It detects the cabin's sealing status using sensors on the doors, windows, and sunroof. If sealed, noise signals are collected using the error on the microphone vibration damping device and a reference microphone. These signals are then processed by an active noise cancellation filter to generate a secondary noise signal, which is played through a speaker. If open, the engine speed is read from the vehicle's CAN signal to generate a reference noise signal, which is also played. The dashboard displays the cabin sealing status and the active noise cancellation system's operating status, determined based on the noise signal collection and noise cancellation signal playback. This invention automatically switches noise cancellation modes according to the cabin's sealing status, effectively reducing interior noise when sealed and appropriately playing reference noise when open, minimizing the impact on the system filter's robustness. Relevant information is displayed on the dashboard, allowing users to intuitively understand the cabin status and system operation.