53 results about "Relative amplitude" patented technology

The invention relates to the technical field of data cleaning, in particular to a medical cyclotron vacuum chamber leakage monitoring method, which comprises the following steps: acquiring the vacuum degree at each moment in a vacuum chamber, the operating power of a vacuum pump at each moment and the magnetic field intensity at each moment in real time when a medical cyclotron operates; dividing all moments into a plurality of monitoring time periods; determining the monitoring sensitivity of each monitoring time period; determining a power influence index at any moment; determining a relative amplitude difference of each monitoring time period; determining a magnetic field influence index at any moment; determining a measurement distance between any moment and other moments; and performing data cleaning on the vacuum degrees at all moments by adopting an anomaly detection algorithm, and monitoring chamber leakage of the vacuum chamber in combination with a deep learning model. According to the invention, the interference of redundant information in the data is reduced, and the accuracy of chamber leakage monitoring of the vacuum chamber is improved.

The invention provides a TLF-GV signal correlation earthquake magnitude prediction method and system, and a medium, belongs to the technical field of earthquake prediction, and aims at solving the problems that a traditional magnitude prediction model lacks physical constraints, TLF-GV features are not fully utilized, the interpretability is poor, and cooperation with a preorder technology is lacked. Comprising the following steps: extracting a multi-source feature vector of a TLF-GV signal containing a gravity component absolute amplitude, a vibration component relative amplitude and a signal phase; based on the G-R law, constructing the positive correlation physical characteristics log10 (GVCIpeak) and BF * Tanomal of the abnormal intensity and the magnitude of the TLF-GV signal; weighting the features according to a Bayesian factor BF value; fitting according to historical samples to obtain a physical empirical formula of positive correlation of GVCI peak logarithm and magnitude as a physical constraint, and constructing a loss function by taking the physical constraint as a regularization item and combining with a mean square error of a magnitude prediction task; and constructing an XGBoost model, and training according to the training set to obtain a prediction model for earthquake magnitude prediction. According to the method, quantitative prediction of earthquake magnitude is realized based on multi-source features of TLF-GV signals in combination with a physically constrained XGBoost regression model.

The invention belongs to the technical field of vibration conditions, and particularly relates to a crawler land constant-speed driving vibration condition correction method, crawler land constant-speed driving vibration data is often regarded as a whole to be processed as a random vibration condition to guide design and examination of parts on a vehicle, and an induction result is usually in a narrow-band + wide-band random form. However, when the crawler runs at a constant speed on the land, the frequency domain characteristic of the vibration data is closer to the form of'sine + broadband random ', and the method is suitable for correction of such vibration conditions. The accuracy of the vibration condition is improved, vibration environment distortion caused by discomfort of the induction method is reduced, and over-test or under-test of the induction vibration test is avoided. According to the invention, the narrowband component in the vibration signal is regarded as the projection of the sinusoidal signal in the power spectral density, the center frequency and the relative amplitude of the narrowband signal are calculated and converted into the frequency and the amplitude of the sinusoidal signal, and the narrowband component is replaced by the sinusoidal component, so that more accurate vibration test conditions are obtained.

The invention relates to a distortion degree measuring system and method based on correlation operation, and the system comprises a signal source which is a to-be-measured signal source for outputting a mixed waveform comprising a fundamental wave and each harmonic component; the fundamental wave extraction module is used for separating and extracting a fundamental wave component of which the waveform is a single-frequency square wave from the signal to be detected; the phase-locked loop frequency multiplication module is used for receiving the fundamental component and locking and extracting a sine wave signal containing the fundamental component and a harmonic component through a phase-locked loop containing a programmable frequency divider; the correlator module is composed of a multiplier circuit and a low-pass filtering and amplifying circuit, receives a to-be-measured signal serving as an input signal and a sine wave signal serving as a reference signal, and outputs a direct-current component; and the single chip microcomputer is configured with the programmable frequency divider, samples the direct current component output by the correlator module, calculates the relative amplitude and the total harmonic distortion degree of the fundamental wave component and the harmonic component, and outputs the total harmonic distortion degree. The beneficial effects are that the measurement system and the signal processing method are suitable for signal harmonic analysis under a complex harmonic environment and a low signal-to-noise ratio condition, a high-performance processor and a computing power requirement are not needed, and the system takes an analog circuit as a main body and has the advantages of high measurement speed, high accuracy, low system cost and the like.

An optical frequency generation system (100), comprising: - reference atoms (7) in a gas phase, - an interrogation laser source (1) configured to emit an interrogation signal (101) comprising a first optical frequency suitable for exciting a two-photon transition in said reference atoms (7), said interrogation signal (101) being configured to interact with said reference atoms (7) in a Doppler-free scheme; - optical frequency modulation means (31, 31a, 31b) configured to adjust said first optical frequency and to modulate said first optical frequency at a first modulation frequency f1; - an optical sensor (9) configured to detect a fluorescence signal (110) from said reference atoms (7); - a first control loop (10) configured to lock said first optical frequency to a resonance frequency of said two-photon transition, said fluorescence signal (110) being input into the first control loop (10); - a mitigation laser source (2) configured to emit a mitigation signal (102) comprising a second optical frequency selected to produce a light-shift of said two-photon transition of opposite sign of the light-shift produced by the interrogation signal (101); characterized in that the optical frequency generation system (100) further comprises: - optical amplitude modulation means (5) configured to modulate the amplitude of the interrogation signal (101) and of the mitigation signal (102) at a second modulation frequency f2, and - a second control loop (20) configured to adjust the relative amplitude of the mitigation signal (102) with respect to the interrogation signal (101) such as to cancel the effective light-shift of the combined interrogation (101) and mitigation (102) signals.

The invention discloses a high-resolution range profile feature retention enhancement method based on iterative weighted sparse decomposition, and the method comprises the steps: obtaining radar echo data collected by a radar receiver within a coherent processing time, and constructing a two-dimensional radar echo matrix composed of a range unit number and a pulse sequence number after range direction matching filtering; representing a two-dimensional radar echo matrix as a superposition relation of adding a low-rank clutter component matrix and a sparse target component matrix; based on the superposition relation, an optimization model is constructed, and the objective function of the optimization model is the sum of the weighted nuclear norm of the low-rank clutter component matrix and the L1 norm of the sparse target component matrix. According to the method provided by the invention, the adaptive weight is applied to the singular value, so that clutters are effectively suppressed under a strong clutter background, and key structure features such as the number, position distribution and relative amplitude relationship of scattering points in the target high-resolution range profile are kept.

A method of fitting spectrum data to a model of biological substance data is disclosed. The method comprises receiving spectrum data, receiving fitting data for each of a plurality of biological substances, wherein fitting data comprises, for each of the plurality of biological substances: a number of reference multiplets for that biological substance, and for each reference multiplet, the position of the centre of that reference multiplet, the number of peaks for that reference multiplet, the relative amplitude of each peak, and the width of each peak. The method further comprises determining a fitting order of the reference multiplets, wherein the position of each reference multiplet in the fitting order is based on the number of possible overlaps with other reference multiplets comprised in the fitting data, starting with the fewest overlaps and ending with the most.

The device for improving the amplitude of the mud pulse signal is used for improving the relative amplitude of an original pulse signal of an underground pulser, obtaining a positive and negative combined pulse signal which is more recognizable than a single positive pulse signal or a single negative pulse signal, improving the relative amplitude of a pulse signal transmitted to the ground, manufacturing a pulse waveform which is easier to recognize, and improving the accuracy of the pulse waveform. The accuracy of a ground acquisition decoding system is improved, and reliable pulse signals are provided for directional drilling of a myriameter ultra-deep well.

The invention provides a probe calibration method for a multi-probe antenna measurement system, and the method comprises the steps: carrying out the measurement of a first amplitude-phase parameter of a first probe located at a target position, enabling at least one probe to move along a preset track, and further measuring a second amplitude-phase parameter of a second probe located at the target position, after amplitude-phase parameter measurement is carried out on the two probes at the same target position, accurate relative amplitude-phase data between the two probes can be obtained according to the measured first amplitude-phase parameter and the measured second amplitude-phase parameter, then accurate calibrated amplitude-phase data of the first probe and the second probe are determined and obtained, accurate calibration of the first probe and the second probe is achieved, and the accuracy of calibration of the two probes is improved. Therefore, the subsequent accurate measurement of the antenna is ensured, the accurate position of the antenna does not need to be calibrated, and errors caused by manual operation (positioning) are avoided.

The invention provides an air interface wire rapid calibration method and system, and solves the problems of high execution complexity and difficulty in engineering application caused by the adoption of space violent search in the existing air interface wire calibration technology. The method comprises the following steps: synchronously starting a static calibration antenna and a reference antenna fixedly connected with a rotary table under a plurality of rotation angles of the rotary table, and acquiring measurement data from measured equipment; determining a phase difference data set and a relative amplitude data set according to the measurement data; reconstructing a plurality of air interface transmission matrixes in a digital domain based on the data set, and screening out at least one calibration antenna spatial position combination by taking a matrix condition number as an index; and air interface wire calibration is completed according to the combination. According to the invention, the calibration complexity is reduced from a combination order to a linear order, the hardware cost and the measurement time are significantly reduced, the high-efficiency and high-precision calibration of large-scale terminals such as a whole vehicle is realized, and the method has wide applicability irrelevant to frequency.

The application discloses a kind of multi-region reservoir potential effective quantification evaluation methods, it includes the following steps: step 1, on the basis of interpretive achievement data, respectively using DSG Seismic Attribute Generation module and OpenGS Openinversion module of module calculation relative amplitude data body and relative wave impedance data body, and carry out construction smoothing;Step 2, in combination with well data, main fracture characteristics and reservoir attribute, in the region of reservoir target obvious and well data, reservoir and T74 layer relative amplitude and relative wave impedance inversion ratio plane calculation and point position statistics are carried out;Step 3, using EXCEL to calculate the ratio between reservoir and T74 layer, and draw the ratio trend chart between the two layers in the study area.The application can intuitively and effectively find out the distribution of the study area reservoir, which solves the problem of previous reservoirs being limited to qualitative analysis and cannot be quantified, breaks the status quo of previous qualitative analysis of reservoir evaluation parameters, and is simple to operate and has strong popularization.

The invention relates to a casing wave relative amplitude correction method and system based on well cementation cement density, and the method does not consider the influence of the cement density change on the casing wave amplitude during the actual well cementation quality evaluation, and simulates the full-wave waveform of sound waves received in a well through the methods of real axis integration and the like. The classic elastic wave theory and the slip interface theory are combined, and the method which is high in universality and is used for correcting the wave amplitude of the casing with the actually-measured cement density to the wave amplitude of the casing with the compared cement density is determined; according to the simulation result of the sound field in the well, the correction method has a reliable theoretical basis; the actual stratum and the rock physical model are combined, calculation is convenient and simple, universality is high, and applicability is wide.

The invention discloses a video copyright registration and identification method, system, device and medium, and the method comprises the steps: responding to an identification instruction, and extracting to-be-identified copyright information from a to-be-identified video; matching the to-be-identified copyright information with multiple pieces of first copyright information in a database, and determining an identification result according to the matched first copyright information; any first copyright information is generated by the following steps: acquiring a first video and first video information; segmenting the first video into a plurality of video frames; extracting a two-dimensional image frame, a depth map and a disparity map from each video frame; dividing each video frame into a plurality of pixel blocks; determining the corresponding pixel representation of each pixel block in the two-dimensional image frame, the depth map and the disparity map, and calculating the modal relative amplitude rate of the corresponding pixel block based on every two pixel representations; generating copyright features according to the relative amplitude rates of all modes; and generating the first copyright information according to the copyright characteristics and the first video information. The copyright protection and traceability efficiency can be improved based on the multi-modal atlas.

The invention relates to the technical field of oil and gas reservoir exploration and development, in particular to a wrinkle strength calculation method. The wrinkle strength calculation method comprises the following steps: firstly, intercepting a seismic trace coordinate point set based on a target layer wrinkle zone plane range, and obtaining the wrinkle width of a corresponding wrinkle zone on each seismic survey line; secondly, calculating the relative amplitude of a target layer fold zone by utilizing a structural trend surface method; assigning the relative amplitude to a seismic trace coordinate point set according to a coordinate corresponding relation to obtain a wrinkle amplitude of each seismic survey line in a corresponding wrinkle zone; and finally, dividing the wrinkle amplitude by the wrinkle width to obtain the wrinkle strength of the corresponding wrinkle zone on each seismic survey line. According to the method, seismic attributes, horizon interpretation and three-dimensional seismic survey network information are comprehensively utilized, the wrinkle range is quantitatively delineated through curvature attributes, horizon is interpreted, the wrinkle amplitude is calculated, and an objective wrinkle strength evaluation result can be obtained.

A method of obtaining a relative amplitude preserving seismic volume acquired in time domain for a subsurface region of interest and transforming it into a low frequency monopolar amplitude volume. The method also determines a seismic attenuation volume from the relative amplitude preserving seismic volume acquired in time domain. Further, the method generates a low frequency monopolar amplitude map of a surface of interest by averaging the low frequency monopolar amplitude volume over a depth window around the surface of interest and generates a seismic attenuation map of the surface of interest by averaging the seismic attenuation volume over the depth window around the surface of interest. The method also determines an attribute map of the surface of interest based on the seismic attenuation map and the low frequency monopolar amplitude map and determines a presence of a gas in the subsurface region of interest based on the attribute map.

SOLUTION: A method includes receiving a first signal from a first loop antenna, and receiving a second signal from a second loop antenna. The method includes sampling the first signal and the second signal at a sampling rate high enough to capture an entire frequency range associated with a plurality of radio sources to generate a first digital signal and a second digital signal. The method includes converting the first digital signal and the second digital signal to a frequency domain representation. The method also includes generating, based on the frequency domain representation, a first bearing estimate for a radio source of the plurality of radio sources by comparing the relative amplitudes and phases of the first digital signal and the second digital signal represented in the frequency domain.EFFECT: The systems and methods provide a redundant navigation tool that can be used in the case of failures in other navigation systems like GPS or inertial navigation systems.SELECTED DRAWING: None

The present invention relates to an attribute-joint seismic signal near-surface attenuation compensation method, comprising the following steps: S1 collecting seismic signals to obtain a data set of common excitation points and a data set of common receiving points; S2 obtaining a relative amplitude attenuation coefficient and a relative main frequency value based on a surface consistency principle; S3 combining the relative amplitude attenuation coefficient with the relative main frequency to perform near-surface attenuation compensation: calculating a Q value by averaging the main frequency value, calculating a compensation curve using the Q value, and adopting a standard deviation normalization algorithm to unify the spatial variation of the amplitude of the compensation curve to the same level, that is, when applying the relative main frequency value for compensation, only the frequency loss is compensated, and the signal amplitude level is not changed; then, applying the relative amplitude attenuation coefficient of the excitation point or the receiving point to the compensation curve, making an overall adjustment to the amplitude level of the compensation curve, thereby compensating for the frequency and amplitude loss caused by the near-surface stratum on the signal attenuation, and restoring the amplitude and frequency consistency to the greatest extent.

The invention provides a spectrum testing method for electro-optical modulation signals. The device is composed of a laser, a microwave signal source, a to-be-measured electro-optical modulation signal generation module, an optical frequency shifter, an electro-optical phase modulator, a photoelectric detector and a spectrum analysis module, optical signals output by the laser are divided into two paths, the upper path is in optical connection with the to-be-measured electro-optical modulation signal generation module, and the lower path is in optical connection with the to-be-measured electro-optical modulation signal generation module. The lower path is sequentially and optically connected with the optical frequency shifter and the electro-optic phase modulator and is optically connected with the photoelectric detector after being combined, the microwave signal source is electrically connected with the radio frequency end of the electro-optic phase modulator, and the output end of the photoelectric detector is electrically connected with the spectrum analysis module. Heterodyne mixing signals f1-pf2 (p is a positive integer) of an electro-optical modulation spectrum signal f1 to be detected and an electro-optical phase modulation signal f2 are detected, mixing signal power ratios when output signal voltages of a microwave signal source are V2 and kV2 respectively are analyzed, the p value and the frequency f1 are determined by utilizing the Bessel function relation, meanwhile, the frequency response of a photoelectric detector is calibrated, and the frequency response of the photoelectric detector is calibrated. The relative amplitude of each order of light modulation sideband of the electro-optical modulation spectrum to be tested is obtained, and spectrum testing of the electro-optical modulation signal to be tested is achieved.

Disclosed herein is a system and method for optimizing audio equalization settings based on the type of music being broadcast, comprising: receiving audio at a processing device; performing a frequency analysis of the received audio, to determine a plurality of frequency components and associated amplitudes of the frequency components of the received audio; generating a spectral plot of the received audio based on the performed frequency analysis of the received audio, wherein the spectral plot comprises an x axis that represents relative amplitude and a y axis that represents frequency components of the received audio; comparing the spectral plot of the received audio to each of a plurality of different predetermined spectral plots; matching the spectral plot of the received audio to at least one of a plurality of different predetermined spectral plots; retrieving a predetermined equalizer settings file that corresponds to the at least one of the matched predetermined spectral plots, wherein the predetermined equalizer settings file comprises a plurality of relative amplitude settings for each of a plurality of frequency bands; and applying the retrieved predetermined equalizer settings to an equalizer that processes the received audio according to the predetermined equalizer settings in the predetermined equalizer settings file.

The present invention relates to an apparatus (1), a system (2), a method (200), and a computer program for synthesizing at least one targeted broadband electromagnetic signal (60). Herein, the apparatus (1) comprises—at least two electromagnetic signal generators (10, 11), wherein the electromagnetic signal generators (10, 11) are configured to provide at least two tributary electromagnetic signals having spectra that overlap at least partially; —at least one signal-combining element (50), wherein the at least one signal-combining element (50) is configured to merge the at least two tributary electromagnetic signals into at least one combined electromagnetic signal; —at least one signal-detecting element (90), wherein the at least one signal-detecting element (90) is configured to generate at least one detection output signal (100) by detecting at least a portion of at least one of the at least one combined electromagnetic signal; —at least one controlling element (110), wherein the at least one controlling element (110) is configured to extract signal information about at least one of a relative amplitude or a relative phase with which the at least two tributary electromagnetic signals are merged into the at least one combined electromagnetic signal from the at least one detection output signal (100); —at least one actuating element (30), wherein the at least one actuating element (30) is configured to modify at least one of the amplitude or the phase of at least one of the at least two tributary electromagnetic signals based on the signal information, wherein modifying the at least one of the amplitude or the phase of the at least one of the at least two tributary electromagnetic signals is performed in a manner that at least one of the at least one combined electromagnetic signal corresponds to the at least one targeted broadband electromagnetic signal (60).

The invention relates to the technical field of high-voltage switch operation state evaluation, and discloses a high-voltage switch operation state evaluation method and system based on intelligent sensing, and the method comprises the steps: obtaining vibration waveform data of a high-voltage switch transmission mechanism in an operation process, and carrying out the noise removal; performing feature extraction on the vibration waveform data according to Fourier transform and wavelet transform to obtain waveform feature parameters, and inputting the waveform feature parameters into the mechanism state classification prediction model to obtain a meshing clearance working condition; obtaining a relative amplitude according to the vibration waveform data, obtaining abnormal waveform data according to a comparison relationship between the relative amplitude and a relative amplitude threshold, and extracting abnormal feature parameters from the abnormal waveform data; and inputting the abnormal characteristic parameters into a state scoring model to obtain a state score, and determining the operation state of the high-voltage switch transmission mechanism according to the state score. According to the invention, comprehensive monitoring and accurate evaluation of the operation state of the high-voltage switch transmission mechanism are realized, and safe and stable operation of a power system is guaranteed.

A system (200) for the control, adjustment or certification of timepieces comprising an optical atomic clock (300), the optical atomic clock (300) comprising an optical frequency generation system (100) including: - reference atoms (7) in a gas phase, - an interrogation laser source (1) configured to emit an interrogation signal (101) comprising a first optical frequency suitable for exciting a two-photon transition in said reference atoms (7), said interrogation signal (101) being configured to interact with said reference atoms (7) in a Doppler-free scheme; - optical frequency modulation means (31, 31a, 31b) configured to adjust said first optical frequency and to modulate said first optical frequency at a first modulation frequency f1; - an optical sensor (9) configured to detect a fluorescence signal (110) from said reference atoms (7); - a first control loop (10) configured to lock said first optical frequency to a resonance frequency of said two-photon transition, said fluorescence signal (110) being input into the first control loop (10); - a mitigation laser source (2) configured to emit a mitigation signal (102) comprising a second optical frequency selected to produce a light-shift of said two-photon transition of opposite sign of the light-shift produced by the interrogation signal (101); characterized in that the optical frequency generation system (100) further comprises: - optical amplitude modulation means (5) configured to modulate the amplitude of the interrogation signal (101) and of the mitigation signal (102) at a second modulation frequency f2; and 27 - a second control loop (20) configured to adjust the relative amplitude of the mitigation signal (102) with respect to the interrogation signal (101) such as to cancel the effective light-shift of the combined interrogation (101) and mitigation (102) signals.

The invention discloses an electroencephalogram signal acquisition equipment evaluation system and evaluation method. The system comprises a standard control signal generation module used for generating a standard control signal; the evaluation module is used for acquiring an electroencephalogram acquisition signal acquired by the electroencephalogram signal acquisition equipment, processing the electroencephalogram acquisition signal, displaying the electroencephalogram acquisition signal and a standard contrast signal, comparing waveforms and parameters of the electroencephalogram acquisition signal and the standard contrast signal, and determining whether the electroencephalogram acquisition signal and the standard contrast signal are in all sample points or not; the number of the samples with the difference relative amplitude exceeding the set threshold value accounts for the total number of the samples. The signal distortion degree is evaluated by calculating the normalized amplitude difference percentage, the difference between the collected signal and the standard contrast signal is comprehensively considered, the distortion condition is quantified, and a reliable index is provided for signal quality evaluation.

The application discloses a high-resolution range profile feature preserving enhancement method based on iterative weighted sparse decomposition, and comprises the following steps: obtaining radar echo data collected by a radar receiver in a coherent processing time, constructing a two-dimensional radar echo matrix composed of a distance unit number and a pulse sequence array after distance matching filtering; expressing the two-dimensional radar echo matrix as a superposition relationship of a low-rank clutter component matrix and a sparse target component matrix; based on the superposition relationship, constructing an optimization model, and a target function of the optimization model is a sum of a weighted nuclear norm of the low-rank clutter component matrix and an L1 norm of the sparse target component matrix. The method of the application realizes effective suppression of clutter in a strong clutter background by applying adaptive weights to singular values, and meanwhile, key structural features such as the number, position distribution and relative amplitude relationship of scattering points in a target high-resolution range profile are maintained.

This invention discloses a network monitoring method and system for short-term earthquake precursor information, relating to the interdisciplinary fields of earthquake monitoring and quantum precision measurement. The method includes constructing a three-dimensional evaluation function based on fault slip rate, historical earthquake frequency, and gravity field gradient, dividing the monitoring area into three risk levels from high to low; deploying a three-level monitoring network according to the risk level, including a main monitoring layer, an auxiliary monitoring layer, and a reference layer; acquiring TLF-GV signals from the main and auxiliary monitoring layers, and performing dynamic calibration and component separation through the reference layer; fusing the relative data after calibration of the main and auxiliary layers with the component data of the reference layer using Kalman filtering to generate a TLF-GV signal dataset containing the absolute amplitude of the gravity component, the relative amplitude of the vibration component, and the signal phase; this method, through reference layer calibration and Kalman filtering fusion, significantly improves the signal fidelity provided by subsequent processing.

The invention discloses a networking monitoring method and system for earthquake short-term precursor information, and relates to the technical field of intersection of earthquake monitoring and quantum precision measurement, and the method comprises the steps: constructing a three-dimensional evaluation function based on a fault sliding rate, a historical earthquake frequency and a gravitational field gradient, and dividing a monitoring region into three risk levels from high to low; arranging a three-level monitoring network according to the risk level, wherein the three-level monitoring network comprises a main monitoring layer, an auxiliary monitoring layer and a reference layer; tLF-GV signals of the main monitoring layer and the auxiliary monitoring layer are collected, and dynamic calibration and component separation are carried out through the reference layer; using Kalman filtering to fuse the calibrated relative data of the main and auxiliary layers and the component data of the reference layer, and generating a TLF-GV signal data set containing the gravity component absolute amplitude, the vibration component relative amplitude and the signal phase; according to the method, reference layer calibration and Kalman filtering are fused, so that the fidelity of signals provided by subsequent processing is remarkably improved.

A method includes receiving a first signal from a first loop antenna and a second signal from a second loop antenna. The method includes sampling the first signal and the second signal at a sampling rate high enough to capture an entire frequency range associated with a plurality of radio sources to generate a first digital signal and a second digital signal. The method includes converting the first digital signal and the second digital signal to a frequency domain representation. The method also includes generating, based on the frequency domain representation, a first bearing estimate for a radio source of the plurality of radio sources by comparing the relative amplitudes and phases of the first digital signal and the second digital signal as represented in the frequency domain.

The present invention provides an echo cancellation system with a delay estimation function, and relates to the field of audio processing technology. The present invention estimates the delay between a near-end signal and a far-end reference signal in an acoustic scene of a device by using a delay estimation module, sets a reasonable buffer delay parameter after locking the delay, prevents the far-end reference signal from lagging behind the near-end echo signal, and thus improves the performance of echo cancellation; uses an amplitude detection module to detect the amplitude of a microphone input and a reference input, reasonably adjusts the relative amplitude of the microphone and the reference input, makes the adaptive filter coefficient to be estimated in the optimal dynamic range, prevents the effective word length effect from causing iterative cumulative errors, and can accelerate the convergence speed of the filter; combines the amplitude detection module to perform truncation distortion detection, controls the freezing and updating of the adaptive filter coefficient, and prevents the divergence of the filter caused by nonlinear disturbances such as truncation distortion or broken sound; uses dynamically adjusted step size and regularization factor, and converges more quickly.

The invention belongs to the field of distributed phased-array antennas, and discloses a distributed power receiving and generating scanning array amplitude-phase consistency test method and system, and the system comprises a distributed phased-array antenna and an amplitude-phase calibration circuit. The in-array amplitude-phase calibration circuit selects one radio frequency transceiving channel in the single phased-array antenna as a reference branch, and measures the relative amplitude and the relative phase of each radio frequency transceiving channel in the single phased-array antenna and the transceiving channel of the reference branch; according to the inter-array amplitude-phase calibration circuit, a reference branch corresponding to one phased-array antenna is used as an inter-array reference branch, and calibration signals successively flow into the reference branches of the other phased-array antennas through switching of a radio frequency electronic switch matrix. And measuring amplitudes and phase errors of reference branch transceiving channels corresponding to other phased-array antennas relative to inter-array reference branch transceiving channels. According to the method, the consistency test on the distributed power receiving and generating scanning array is realized, and the method can be applied to distributed detection and distributed confrontation.