Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
46 results about "Frequency domain algorithm" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Brain electrical signal independent component extraction method based on convolution blind source separation
ActiveCN104700119AImprove featuresImprove accuracyCharacter and pattern recognitionModel extractionComputation complexity
The invention discloses a brain electrical signal independent component extraction method based on convolution blind source separation. The brain electrical signal independent component extraction method based on the convolution blind source separation includes concrete steps: building a brain electrical signal independent component extraction system based on the convolution blind source separation, which comprises an AD (analog to digital) sampling module, a short time Fourier transformation module, a frequency domain instantaneous blind source separation module, a sequence adjustment module and a short time inverse Fourier transformation module; using the AD sampling module to sample brain electrical signals; using the short time Fourier transformation module to transform the brain electrical signals from a time domain to a frequency domain; using the frequency domain instant blind source separation module to separate instantaneous mixing signals in the frequency domain; using the sequence adjustment module to perform sequence adjustment on independent components in a vector on each frequency domain segment; using the short time inverse Fourier transformation module to transform a frequency domain separation result into an independent component on the time domain. The brain electrical signal independent component extraction method based on the convolution blind source separation extracts the independent components of brain electrical signals based on a true convolution mixing model, uses a convolution blind source separation frequency domain algorithm, and is simple to achieve, good in separation effect, and low in calculation complexity.
Owner:BEIJING MECHANICAL EQUIP INST
Method for demultiplexing polarization by using constant rotation sign training sequence
InactiveCN101895499APhase-modulated carrier systemsMulti-frequency code systemsFrequency spectrumPolarization diversity
The invention belongs to the field of optical communication, and is applied to the polarization demultiplexing of a polarization diversity multiplexing coherent optical communication system. According to the invention, for the problem of the polarization demultiplexing in the polarization diversity multiplexing coherent optical communication system, a special training sequence and related algorithms are designed. Through the method, a coherent receiver can fast, automatically and accurately perform the polarization demultiplexing. As the track of the training sequence, viewed from a planisphere, rotates along a unit circle after sign power is normalized, the training sequence provided by the invention is called a constant rotation sign training sequence. The invention discloses two processing algorithms for the constant rotation sign training sequence, which are a frequency-domain algorithm and a time-domain algorithm respectively, wherein the frequency-domain algorithm can be combined with frequency-domain dispersion compensation without adding a frequency spectrum calculation module. Through the method, the receiver does not need synchronizing with an initial position of the training sequence.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Time-frequency domain hybrid adaptive active noise control algorithm
ActiveCN102629469AGuaranteed Zero LatencySmall amount of calculationSound producing devicesNoise controlTime delays
The invention discloses a time-frequency domain hybrid adaptive active noise control algorithm. According to the algorithm, an entire control filter is divided into two blocks according to time delay characteristic of noise propagation; one of the two blocks is used for finishing filtering in time domain to guarantee no time delay, and frequency-domain filtering is adopted by the other one of the two blocks; the updating of both the filters of data of the two blocks is finished in the frequency domain; and thus, the algorithm guarantees that zero time delay control of a noise signal is firstly achieved and the amount of calculation of the entire system is reduced by utilizing a multi-time delay frequency domain algorithm, thereby integrally improving the applicability and the performance of the multi-time delay frequency domain algorithm. The time-frequency domain hybrid adaptive active noise control algorithm has the obvious advantage of breaking through the time delay limit of the multi-time delay frequency domain adaptive algorithm and can be used at places without time delay requirements.
Owner:SHENZHEN COOLHEAR INFORMATION TECH CO LTD
Large frequency deviation evaluation and correction method of orthogonal frequency multiplexing signal carrier
InactiveCN101197802AOvercome limitationsFast trackBaseband system detailsMulti-frequency code systemsLow-pass filterFourier transform on finite groups
The invention relates to a large frequency deviation estimation and correction method for quadrature frequency division multichannel signal carriers, comprising the following steps: time domain frequency deviation estimation of frequency deviation, and time domain frequency deviation correction according to estimation results. The invention also comprises the following steps: smooth processing of the time domain frequency deviation estimation is performed, namely a low pass filter is adopted to smooth down peak values and valley values of time domain frequency deviation estimation values; after the time domain frequency deviation correction, Fourier transformation is performed; frequency domain frequency deviation estimation is performed on transformation results; frequency domain frequency deviation estimation results or time domain frequency deviation estimation results after smooth processing participate in time domain frequency deviation correction once again. The method of the invention overcomes limitation of the prior frequency domain algorithm on frequency deviation estimation and has the advantages of capability of processing large frequency deviation, capability of guaranteeing smooth signal processing, capability of quickly tracking frequency deviation caused by movement, and capacity of being conveniently realized in an integrated circuit design.
Owner:李文革
Vehicle-induced bridge transverse vibration reaction calculation method based on frequency domain method
InactiveCN111027213ASimple calculationFacilitates random vibration analysisDesign optimisation/simulationBogieFrequency spectrum
The invention discloses a vehicle-induced bridge transverse vibration reaction calculation method based on a frequency domain method, provides a novel railway bridge transverse vibration response determination method. Compared with a traditional time domain analysis method, the novel railway bridge transverse vibration response determination method has the advantages that a train load spectrum issubdivided into a load sequence spectrum and a bridge harmonic modal spectrum, the influence relation of transverse simple harmonic frequency, train speed, a load sequence and different load amplitudes on the spectrums is researched, and calculation is simplified theoretically; transverse vibration of an axle is directly decoupled, bogie force is simplified for wheel set transverse force, and random vibration analysis is facilitated by adopting a frequency domain algorithm according to the power spectral density of the wheel set transverse force; therefore, the method provided by the inventionis small in calculation amount and high in calculation efficiency; and based on the determined modal number, the calculation precision is relatively good.
Owner:SOUTHWEST JIAOTONG UNIV
Method and system for reducing interferences due to handshake tones
InactiveUS7764752B2Overcome problemsEnhanced advantageMultiple-port networksError preventionEngineeringCustomer-premises equipment
A method and system of the present inventions reduces both near-end crosstalk (NEXT) and far-end crosstalk (FEXT) interferences due to handshake tones into upstream and downstream neighboring services, both at the customer premises equipment (CPE) and at the central office (CO), when handshake is experienced. An embodiment of the present inventions is directed to significantly reduce the NEXT and / or FEXT interferences due to handshake tones. For example, NEXT and / or FEXT interferences due to G.994.1 handshake tones, identified as, bins 7 and 9 for the Upstream channel and bins 12, 14 and 64 for the Downstream channel may be reduced. An embodiment of the present inventions provides an algorithm that may be used for both NEXT and FEXT Handshake Interferences reduction at the CO and at the CPE. In addition, the algorithm may operate in the time domain and in the frequency domain. Frequency domain algorithm offers two options, both versions taking advantage of the high correlation time of the Handshake tone signals.
Owner:IKANOS COMMUNICATIONS
Method and device for detecting seeding quality of duckbill drum type seeding machine
PendingCN110132625AImprove anti-interference characteristicsEasy to installTransmission systemsStructural/machines measurementSignal conditioning circuitsWireless transmission
Owner:CHINESE ACAD OF AGRI MECHANIZATION SCI
Signal processing method, system and device based on phased array incoherent scattering radar
ActiveCN111273267AImprove real-time performanceImprove accuracyRadio wave reradiation/reflectionInformation processingFrequency spectrum
The invention belongs to the field of signal and information processing, particularly relates to a signal processing method, system and device based on a phased array incoherent scattering radar, andaims to solve the problems of low real-time performance and accuracy of signal processing of the existing incoherent scattering radar. The method comprises the following steps: acquiring an echo signal scattered by an ionized layer to aquire an IQ digital signal as a first signal through down-conversion, AD sampling and digital orthogonal down-conversion; performing complex weighting and summationoperation on the first signal to obtain a second signal; removing clutters of the second signal through a preset clutter removing method, and obtaining autocorrelation data through a frequency domainFFT algorithm; circularly acquiring autocorrelation data, accumulating the autocorrelation data, removing background noise after accumulation, and performing calibration correction through a preset data calibration method and a spectrum ambiguity function; and fitting the calibrated and corrected data with theoretical autocorrelation data to obtain ionospheric parameters. According to the invention, the real-time performance and the accuracy of signal processing of the incoherent scattering radar are improved.
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Staggered-SAR echo signal reconstruction method
InactiveCN106199602AQuality improvementAccurately reflect lossRadio wave reradiation/reflectionFrequency spectrumFourier transform on finite groups
The invention discloses a Staggered-SAR echo signal reconstruction method, and the method employs fonformal Fourier transform to process a radar signal after distance compression. The method gives full consideration to the characteristics of Staggered-SAR echoes, and can obtain a uniform azimuth frequency spectrum suitable for the high-quality imaging of a radar. The frequency spectrum obtained through the method can accurately reflect the frequency spectrum characteristics of azimuth echoes under the conditions of data loss and non-uniform sampling, and finally can be used by a Staggered-SAR system for high-quality imaging. Compared with a conventional method, the method can obtain the uniform azimuth frequency spectrum, is suitable for a classical frequency domain algorithm, and can obtain a high-quality imaging result.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Echo cancellation method and system based on all-phase multi-delay partitioning frequency domain
ActiveCN107071197ATroubleshoot Spectrum LeakageThe echo is estimated to be goodTwo-way loud-speaking telephone systemsFrequency spectrumSelf adaptive
The invention relates to an echo cancellation method and system based on an all-phase multi-delay partitioning frequency domain. The method comprises the following steps: receiving remote audio signals, performing sample processing to obtain continuous remote audio sampling signals, and separately storing the continuous remote audio sampling signals; receiving near-end audio signals, performing sample processing to obtain continuous near-end audio sampling signals, and separately storing the continuous near-end audio sampling signals; respectively integrating the remote audio sampling signals and the near-end audio sampling signals, and respectively performing all-phase processing to obtain remote signals and near-end signals; performing Fourier transform processing on the remote signals and the near-end signals, and performing adaptive echo cancellation processing on the remote signals and the near-end signals converted into the frequency domain by using a multi-delay partitioning frequency domain algorithm to obtain audio signals; and encoding the audio signals, and sending the audio signals to a remote receiving end. Therefore, the spectrum leakage problem resulting from that the multi-delay partitioning frequency domain algorithm needs to be converted from the time domain into the frequency domain is solved, the echo estimation is better, and a better echo cancellation effect is achieved.
Owner:SYSU HUADU IND SCI & TECH INST +1
Low-frequency oscillation online control strategy based on mode matching
InactiveCN112564093AIncreased LFO identification speedImprove robustnessFlicker reduction in ac networkPattern matchingSimulation
The invention discloses a low-frequency oscillation online control strategy based on mode matching, and relates to the technical field of power system stabilization and control. The low-frequency oscillation online control strategy comprises the step of applying a dynamic stability control strategy generated by small interference calculation and sensitivity analysis to low-frequency oscillation online based on mode matching. According to improved Prony, QR and IRA algorithms and a characteristic value sensitivity principle, a criterion of mode matching and an online modal calculation method are provided, advantages of the time domain improved Prony algorithm, the frequency domain QR algorithm and the IRA algorithm are combined to match a small interference calculation result with mode information obtained in real time by the on-line improved Prony algorithm, when a vibration mode calculated by small interference real-time scanning is mismatched, a power system stabilizer PSS based on aparticle swarm optimization technology is adopted for restraining low-frequency oscillation, the low-frequency oscillation recognition speed of a large power grid is improved on the whole, meanwhile,the real-time performance and the accuracy of discovery and solution are met, parameter optimization is conducted on the PSS through the particle swarm optimization technology, and the robustness ofthe system is improved.
Owner:ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
Gravity abnormal boundary enhancement method and device
ActiveCN105891889AAvoid amplificationCharacter and pattern recognitionSeismic signal processingGravity anomalyComputer science
The embodiment of the invention provides a gravity abnormal boundary enhancement method and device. The method comprises the steps of: obtaining gravity abnormal data of a target work area, and meshing the gravity abnormal data; adopting a space domain operator to extract the gravity abnormal boundary extremum information of a first grid mesh point in a preset direction one by one; and based on the abnormal boundary extremum information of the first mesh point, calculating a coherent enhancement value of a second mesh point. According to the invention, space domain processing is carried out on the gravity abnormal data, the amplification effect of a conventional frequency domain algorithm on data noise is avoided, and the clear and continuous gravity abnormal boundary information can be obtained.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Rail traffic rail detection system based on acoustic waves
PendingCN109515472ARailway auxillary equipmentRailway profile gaugesAudio power amplifierFrequency spectrum
The invention belongs to the field of rail traffic rail detection and provides a rail traffic rail detection system based on acoustic waves. The rail traffic rail detection system based on acoustic waves comprises an impact hammer, a sound pick-up, a signal amplifier and a microprocessor; the impact hammer is a metal hammer; by using the impact hammer to strike a rail, the rail produces a sound; the sound pickup receives the sound produced by the rail; after amplifying a sound signal received by the sound pickup, the signal amplifier outputs the sound signal to the microprocessor; the microprocessor calculates the received signal by using a time domain-to-frequency domain algorithm to obtain frequency spectrum data of the received signal; the calculated frequency spectrum data are comparedwith hub frequency spectrum saved in the system; and therefore, rail cracks and screw loosening are detected.
Owner:北京天一高科科技有限公司
An Improved Geosynchronous Orbit SAR Frequency Domain Imaging Method
ActiveCN104749575BAchieve imagingReduce space variabilityRadio wave reradiation/reflectionRange migrationImaging algorithm
The invention discloses a modified geosynchronous orbit SAR (synthetic aperture radar) frequency-domain imaging method. A part with zero Doppler frequency rate can be effectively imaged by the method, with good focusing effect; meanwhile, for the part with non-zero Doppler frequency rate, the method allows better focusing performance than the traditional frequency-domain algorithm does. According to the method, the Doppler frequency rate caused by an acceleration component along a slant range direction is compensated, nonlinear azimuth time-frequency relation of raw echo is converted into linear time-frequency relation, and thus, in following operations, the SAR frequency-domain imaging algorithm can be used to correct a range migration in range Doppler. Meanwhile, an acceleration value subjected to compensational optimization is selected by numerical retrieval, variance of azimuth is greatly reduced, and focusing of a larger scene can be achieved during azimuth focusing. Verifications show that the method is suitable for imaging different parts of a GEO (geosynchronous orbit) SAR rail.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
High-sampling-rate vibration analysis device based on Zynq Ultra Scale + MPSoC platform
PendingCN112540947ARealize long-term collectionMeet testing needsMultiple digital computer combinationsVibration testingReal time analysisAlgorithm
The invention discloses a high-sampling-rate vibration analysis device based on a Zynq Ultra Scale + MPSoC platform. The high-sampling-rate vibration analysis device comprises a front-section analog circuit, the Zynq Ultra Scale + MPSoC platform and peripheral equipment, the front-section analog circuit is used for conditioning signals of the acceleration sensor and the rotating speed sensor; theZynq Ultra Scale + MPSoC platform is used for processing a signal; and the peripheral equipment comprises an LCD display screen and is used for displaying processing results of the frequency domain algorithm and the time domain algorithm. The problems that in the prior art, the real-time performance is low, and real-time analysis and positioning of working states of all parts of the rotating machine by technicians are not facilitated can be solved.
Owner:北京辰宇航康科技有限公司
Non-visual-field single-input multiple-output three-dimensional reconstruction method for non-uniform fast Fourier transform
ActiveCN112540381AAvoid backprojection reconstructionIncrease speedElectromagnetic wave reradiationRapid imagingFast Fourier transform
The invention discloses a non-visual-field single-input multiple-output three-dimensional reconstruction method for non-uniform fast Fourier transform. A single-input multiple-output technology is introduced in the field of non-vision-field imaging for the first time, and an existing system is utilized to perform rapid imaging on a non-vision-field scene through non-uniform fast Fourier transform.The method comprises the following steps of non-uniformly scanning a reflection medium surface by adopting a laser, receiving a time-photon histogram of an echo by using a detector, preprocessing received data, and converting the received time-photon data into time-amplitude data, utilizing an optimization algorithm to solve the optimal time wave number spectrum for the preprocessed data througha two-dimensional non-uniform fast Fourier transform relation of the spatial dimension, and then performing one-dimensional fast Fourier transform on the time wave number spectrum in the time dimension, performing interpolation processing on the transformed frequency spectrum by using a single-input multi-output frequency domain algorithm, and performing inverse fast Fourier transform on the frequency spectrum after interpolation processing to obtain a non-vision-field scene three-dimensional reconstruction result.
Owner:XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
Modified geosynchronous orbit SAR (synthetic aperture radar) frequency-domain imaging method
ActiveCN104749575AAchieve imagingReduce space variabilityRadio wave reradiation/reflectionSynthetic aperture sonarImaging algorithm
The invention discloses a modified geosynchronous orbit SAR (synthetic aperture radar) frequency-domain imaging method. A part with zero Doppler frequency rate can be effectively imaged by the method, with good focusing effect; meanwhile, for the part with non-zero Doppler frequency rate, the method allows better focusing performance than the traditional frequency-domain algorithm does. According to the method, the Doppler frequency rate caused by an acceleration component along a slant range direction is compensated, nonlinear azimuth time-frequency relation of raw echo is converted into linear time-frequency relation, and thus, in following operations, the SAR frequency-domain imaging algorithm can be used to correct a range migration in range Doppler. Meanwhile, an acceleration value subjected to compensational optimization is selected by numerical retrieval, variance of azimuth is greatly reduced, and focusing of a larger scene can be achieved during azimuth focusing. Verifications show that the method is suitable for imaging different parts of a GEO (geosynchronous orbit) SAR rail.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Method and system for reducing interferences due to handshake tones
InactiveCN1685626AReduce distractionsCross-talk reductionMulti-frequency code systemsEngineeringInterference reduction
Owner:肯奈克斯特公司
Time domain and frequency domain combined non-reciprocal medium micro-discharge threshold prediction method
ActiveCN111259584AHigh precisionImprove computing efficiencyDesign optimisation/simulationCAD numerical modellingComputational physicsSecondary electrons
The invention discloses a time domain and frequency domain combined non-reciprocal medium micro-discharge threshold prediction method. The method is characterized in that a time domain method and a frequency domain method are combined, and in order to solve the problem that a non-reciprocal medium electric field and a non-reciprocal medium magnetic field cannot be accurately solved in a time domain algorithm, a finite element method is used for solving the size and distribution of the fields in a frequency domain; in order to solve the problem of low efficiency of a particle propulsion calculation method in a frequency domain algorithm, a solving frequency domain field is combined with a time domain algorithm, so that the operation efficiency is further improved. In addition, a particle motion technology, a secondary electron emission model and particle-electromagnetic boundary conditions are utilized to quickly calculate and predict the micro-discharge threshold of the non-reciprocalmedium. Particularly, when the micro-discharge threshold value is calculated, the prediction track of the equivalent macro particle motion can be obtained, so that the distribution of the equivalent macro particles and the electric quantity of the macro particles can be predicted.
Owner:BEIHANG UNIV +1
Secured communicating method and device for hiding talking voice
InactiveCN1307813CRealize the function of voice confidential communicationSolve the problem of being vulnerable to eavesdroppingSecret communicationSecuring communicationSpeech soundFrequency domain algorithm
Owner:成都世纪顶点科技有限公司
A method for reconstruction of staggered-sar echo signals
InactiveCN106199602BQuality improvementAccurately reflect lossRadio wave reradiation/reflectionFrequency spectrumFourier transform on finite groups
The invention discloses a Staggered-SAR echo signal reconstruction method, and the method employs fonformal Fourier transform to process a radar signal after distance compression. The method gives full consideration to the characteristics of Staggered-SAR echoes, and can obtain a uniform azimuth frequency spectrum suitable for the high-quality imaging of a radar. The frequency spectrum obtained through the method can accurately reflect the frequency spectrum characteristics of azimuth echoes under the conditions of data loss and non-uniform sampling, and finally can be used by a Staggered-SAR system for high-quality imaging. Compared with a conventional method, the method can obtain the uniform azimuth frequency spectrum, is suitable for a classical frequency domain algorithm, and can obtain a high-quality imaging result.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Ionospheric Electron Density Retrieval Method Based on Clean Algorithm
ActiveCN111580061BImprove real-time performanceReduce time complexityWave based measurement systemsInformation processingComputational physics
The invention belongs to the field of signal and information processing, and specifically relates to an ionospheric electron density inversion method, system, and device based on the CLEAN algorithm, aiming at solving the large amount of calculation of incoherent scattered plasma spectral lines and the insufficient accuracy of electron density profile inversion The problem. The method of this system includes: obtaining the IQ digital signal; extracting and deleting the signal part collected during the pulse transmission in the IQ digital signal, and constructing a two-dimensional matrix; decoding and calculating the signal power spectrum of each range gate height through the frequency domain FFT algorithm; iteratively obtaining each distance Accumulate the power spectrum data of the gate height, and denoise through the system frequency response function; deconvolute the denoised power spectrum data based on the CLEAN algorithm; obtain the plasma spectral line of the entire height profile by the spline interpolation method, and The ionospheric electron density profile was obtained by fitting the Langmuir dispersion relation. The invention improves the real-time calculation of plasma spectral lines and the precision of electronic density profile inversion.
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Image processing method and device, server and storage medium
PendingCN111626911AImprove robustnessImage data processing detailsProgram/content distribution protectionPattern recognitionFrequency spectrum
The embodiment of the invention provides an image processing method and device, a server and a storage medium. The method comprises the steps of acquiring a watermark image and an original image; processing the original image based on a preset first frequency domain algorithm to obtain a first frequency spectrum matrix; processing the watermark image based on the first frequency domain algorithm to obtain a second frequency spectrum matrix; embedding the second frequency spectrum matrix into the first frequency spectrum matrix to generate a third frequency spectrum matrix; and processing the third frequency spectrum matrix based on a preset second frequency domain algorithm to obtain a target image. Therefore, based on the image copyright protection of the hidden watermark, the hidden watermark information is added in the frequency domain, operations such as shearing, smearing, compressing and filtering can be resisted, and the image robustness is effectively improved.
Owner:JINGDONG TECH HLDG CO LTD
Frequency domain active noise control system based on coefficient smoothing
ActiveCN113421541AImprove stabilityImprove effectivenessSound producing devicesControl systemControl engineering
The invention discloses a frequency domain active noise control system based on coefficient smoothing, which comprises a rear-end control filter, a coefficient smoother and a front-end control filter which are connected in sequence, and is characterized in that the coefficient smoother is used for smoothing the time domain coefficient of the front-end control filter according to the obtained time domain coefficient of the rear-end control filter; and a front-end control filter is updated to limit system noise caused by overlarge coefficient change, so that the stability and the effectiveness of the active noise control system are improved. According to the invention, the problem of noise occurring in an active noise control system using a frequency domain algorithm is solved.
Owner:南京南大电子智慧型服务机器人研究院有限公司 +2
Time-frequency domain hybrid adaptive active noise control algorithm
ActiveCN102629469BGuaranteed Zero LatencySmall amount of calculationSound producing devicesNoise controlTime delays
The invention discloses a time-frequency domain hybrid adaptive active noise control algorithm. This algorithm divides the entire control filter into two blocks according to the delay characteristics of noise propagation, and one block completes filtering in the time domain to ensure no delay. , the other block uses frequency domain filtering, but the filter updates of the two blocks of data are completed in the frequency domain. This not only ensures the algorithm's zero-delay control of the noise signal that arrives first, but also uses the multi-delay frequency domain algorithm to reduce the overall The calculation amount of the system is reduced, thereby overall improving the applicability and performance of the multi-delay frequency domain algorithm. The significant advantage of the present invention is that it breaks through the time delay limit of the multi-delay frequency domain adaptive algorithm, making it applicable to situations without time delay requirements.
Owner:SHENZHEN COOLHEAR INFORMATION TECH CO LTD
Information hiding method and device and computer storage medium
PendingCN113704710AImprove protectionEasy to hideImage data processing detailsDigital video signal modificationPattern recognitionInformation processing
The invention discloses an information hiding method and device and a computer storage medium, relates to the technical field of information processing, and solves the technical problem of low confidentiality of hidden information. The information hiding method comprises the following steps: acquiring a first image and a second image; processing the first image through a frequency domain algorithm to obtain a grey-scale map; carrying out gray processing on the second image according to the gray-scale map, and carrying out sub-affine transformation scrambling on the image subjected to the gray processing to obtain a third image; and embedding the third image into the grey-scale map, and obtaining a fourth image hiding the second image through a frequency domain reduction algorithm.
Owner:SHANGHAI JUNZHENG NETWORK TECH CO LTD
A Method for Predicting the Underwater Propagation Characteristics of Loran‑c Pulses with High Accuracy
ActiveCN105259411BReduce calculation errorsReduce period recognition errorSpectral/fourier analysisUsing reradiationCurrent elementWave field
Owner:SHAANXI UNIV OF SCI & TECH
Nondestructive voice quality stereo echo cancelling method
InactiveCN100552775CReduce correlationQuality is not affectedStereophonic circuit arrangementsSpeech analysisTime domainPhase noise
The invention discloses a stereo echo cancellation method without loss of speech quality. The method is: performing FFT transformation on a frame of stereo left and right channel audio input signals at the nth moment to obtain its corresponding frequency domain signal; adding random to the frequency domain signal The phase noise is used to obtain the frequency domain input signal of the left and right channel speakers in the room that receives the speech signal; the IFFT transform is performed on the speaker frequency domain input signal to obtain the time domain input signal of the left and right channel speakers in the room that receives the speech signal; the speaker frequency domain input signal is used as a stereo echo For the offset reference signal, the frequency domain stereo echo cancellation algorithm is used to remove the echo in the microphone input signal in the room that receives the voice signal at the nth moment, thereby obtaining a voice signal without echo. This method is combined with the frequency domain algorithm of the stereo echo cancellation system to reduce the amount of calculation. At the same time, due to the insensitivity of the human ear to sound phase, adding phase random noise to the left and right channel signals has no impact on speech quality.
Owner:NANJING UNIV
A Method for Extracting Independent Components of EEG Signals Based on Convolutional Blind Source Separation
ActiveCN104700119BImprove featuresImprove accuracyCharacter and pattern recognitionComputation complexityModel extraction
The invention discloses a method for extracting independent components of EEG signals based on convolution blind source separation. The specific steps are: building an AD sampling module, a short-time Fourier transform module, a frequency domain instantaneous blind source separation module, and sequence adjustment EEG signal independent component extraction system based on convolutional blind source separation of module and short-time Fourier inverse transform module; AD sampling module samples EEG signal; short-time Fourier transform module transforms time-domain EEG signal to the frequency domain; the frequency domain instantaneous blind source separation module separates the frequency domain instantaneous mixed signal; the sequence adjustment module sequentially adjusts the independent components in the vector on each frequency domain segment; the short-time Fourier inverse transform module converts the frequency domain The separation results are transformed into independent components in the time domain. The invention extracts independent components of EEG signals based on a more realistic convolution mixed model, adopts a frequency domain algorithm of convolution blind source separation, and has simple implementation, good separation effect and low computational complexity.
Owner:BEIJING MECHANICAL EQUIP INST
Target fruit identification method in night vision environment
PendingCN113989651AImprove image qualityImprove picking efficiencyCharacter and pattern recognitionArtificial lifeNight visionOphthalmology
The invention discloses a target fruit identification method in a night vision environment, and the method comprises the following steps: 1, obtaining an environment image with the target fruit in the night vision environment, carrying out the noise reduction of the environment image through employing a frequency domain algorithm based on edge direction features, and obtaining a denoised environment image; 2, performing target fruit recognition from the denoised environment image by adopting an a * CbR fusion space method to obtain a target fruit image; and step 3, optimizing the circle center and the corresponding radius of the target fruit image obtained in the step 2 by adopting a three-point circle setting method improved by a genetic algorithm to obtain a final target fruit recognition result.
Owner:JIANGSU UNIV OF SCI & TECH
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com