84 results about "Viterbi algorithm" patented technology

The invention relates to the technical field of speech recognition, and discloses an out-of-set word rejection recognition method and device, equipment and a medium, and the method comprises the steps: carrying out the forced alignment of a current speech segment recognition result and a target command word, and obtaining an alignment path, and the process is based on dynamic planning and a Viterbi algorithm, and is combined with a CTC criterion; determining a key interval according to the alignment path, and judging and counting wrong line counts according to two types of alignment results of a bank phoneme and a target command word phoneme; positioning a key phoneme pair containing position association in combination with the alignment path and the phoneme sequence characteristics of the target command word; calculating the position distance of the key phoneme pair and judging whether the position distance is abnormal; and if the error line count exceeds the set threshold value or the position distance is abnormal, determining the word as an out-of-set word and refusing to identify, otherwise, determining the word as an effective command word. The method does not need to train a model again, is adaptive to low-resource equipment, is simple in calculation, is small in resource occupation, can precisely recognize the similar set external words, reduces the error recognition rate, improves the voice interaction accuracy, and meets the precise control demands of a smart home.

The invention discloses a signaling road network matching method based on a heterogeneous graph convolutional network and an attention mechanism, and belongs to the crossing field of mobile communication and intelligent traffic technologies. According to the method, a multi-relation graph containing a road segment set and a base station sampling point set is constructed, wherein an edge set covers associated edges of base station sampling points and road segments, topological edges of the road segments and time edges of the base station sampling points; performing feature extraction on the multi-relation graph by adopting a 3-5-layer heterogeneous graph convolutional network to obtain low-dimensional vector representation of nodes; dynamically calculating an observation probability and a transition probability based on an attention mechanism; and performing path search by using an improved Viterbi algorithm in combination with a backtracking mechanism and a pruning strategy, and outputting a path with the highest score as a matching result. The method can effectively solve the problems of poor adaptability to complex road networks, insufficient robustness to high positioning error signaling data, low precision caused by matching probability immobilization and the like in the prior art, significantly improves the accuracy and robustness of signaling road network matching in complex scenes, and can be applied to the fields of traffic flow monitoring, travel mode analysis, urban planning and the like.

Systems and methods detect and prevent vishing attacks through an integrated framework combining SIP header customization, STIR / SHAKEN frameworks, AI / ML analysis, and real-time speech analysis using the Viterbi algorithm. The system begins with call initiation, embedding authentication information in the SIP header. The SIP data is transmitted and verified using STIR / SHAKEN frameworks, ensuring the authenticity of the caller's identity. Verified data is cross-referenced with third-party databases and analyzed by an AI / ML engine to detect anomalies. If potential fraud is detected, the call is blocked, and the customer is notified. Calls that pass initial checks are further analyzed using the Viterbi algorithm, which converts speech to text and identifies suspicious patterns. An anomaly pattern detector processes the converted text to detect vishing indicators, terminating the call if a match is found. This multi-layered approach ensures robust protection against vishing, enhancing the security and reliability of voice communications while safeguarding users from fraud.

The invention provides a visual positioning method and device for a tunnel scene and a medium, and belongs to the field of visual localization, and the method comprises the steps: obtaining image data of a tunnel region shot by an imaging assembly on a test vehicle; the image data comprises a color image and a depth image; acquiring motion data acquired by an inertial sensor on the test vehicle; based on an oFAST algorithm, an FREAK algorithm, a non-maximum suppression algorithm and a random sampling consistency algorithm, performing optimization processing on the feature points extracted from the color image to obtain a uniformly distributed feature point set; based on a Viterbi algorithm and a second-order hidden Markov model, screening out a reference image sequence according to the color image, the depth image and the motion data; based on the improved target detection model, tunnel scene features in the tunnel are extracted according to the color image; and obtaining the current pose of the test vehicle according to the tunnel scene features, the reference image sequence and the depth image. According to the invention, the positioning precision in the tunnel scene is improved.

The invention discloses an online detection system and method for optical indexes of a hollow-core optical fiber, and relates to the technical field of optical performance detection of optical fibers, and the system comprises an optical fiber connection module, an optical performance detection module, a production linkage module and a data interaction module. The method comprises the following steps: welding the inner end of a production optical fiber with a system at one time; the industrial personal computer reads PLC production data and generates a test trigger condition; when the conditions are met, controlling the OTDR to test the optical indexes of the optical fiber; carrying out segment processing on the OTDR curve by using an improved Viterbi algorithm so as to identify fault features; performing automatic environment compensation based on an attenuation reference model established by the LSTM neural network; and finally, uploading the analysis data to a manufacturing execution system. According to the invention, on-line, real-time and accurate detection of the optical indexes of the hollow-core fiber is realized, traditional multi-time welding is replaced by one-time welding, the detection efficiency is greatly improved, and the problems of poor sealing performance, low efficiency and low data reliability in the prior art are solved.

The invention relates to a rotary machine composite fault detection method and system under a time-varying working condition, and belongs to the technical field of rotary machine fault diagnosis. The method comprises the steps of collecting a non-stationary vibration signal under a variable speed working condition, fusing a third-order Renyi entropy and kinematics prior to construct an adaptive time-frequency enhancement model, and outputting weighted time-frequency distribution; global optimization is carried out through a priori constraint Viterbi algorithm, and an instantaneous frequency ridge line is extracted under the condition of no rotating speed sensor; performing angular domain resampling by taking the ridge line as a phase reference, and converting a non-stationary signal into an angular domain stationary signal; constructing an extended difference mode decomposition convex optimization model, and iteratively solving an optimal difference spectrum; and determining a frequency spectrum segmentation threshold value based on self-adaptive change point analysis, performing decoupling separation and time domain reconstruction on the optimal difference spectrum, and completing composite fault diagnosis through feature comparison. The method does not need an external tachometer, can adaptively extract and separate the composite fault features under the variable speed working condition, is high in diagnosis accuracy, and is good in engineering application value.

The invention provides a method, device and equipment for promoting retention through interaction scene prediction and a storage medium, and the method comprises the steps: obtaining a current multi-modal interaction data stream between users in an interaction scene, carrying out the preprocessing of noise filtering, framing processing, size normalization, time aggregation and the like, extracting emotion features, and generating a real-time multi-dimensional observation vector sequence. The sequence captures complementarity and time sequence dependence of multi-modal information, and overcomes limitation of single-modal static analysis. The observation vector sequence is input into a pre-trained hidden Markov model, and the model is trained based on historical sequences and defines a hidden state set, an initial probability, a transfer matrix and an emission probability; the optimal emotional state path at the current moment is obtained through Viterbi algorithm reasoning, and probability modeling and dynamic prediction of emotion transfer uncertainty are achieved. The current emotion state is extracted from the path, the mimicry representation of the virtual pet is driven to be displayed on the interactive interface, visual feedback is formed, emotion connection is enhanced, and the user retention rate is increased.

The invention discloses a business state prediction method and device, electronic equipment and a storage medium. The system comprises the following steps: acquiring a log historical data set of a system and an initial observation probability of each log; constructing an initial hidden Markov model; according to a forward algorithm module, the initial observation probability and the model initial parameters, calculating the observation anomaly probability of any log observation sequence to obtain an anomaly probability distribution result of the log; performing weighted fusion on the abnormal probability distribution result, and determining the service state sequence length of the system according to the weighted abnormal probability distribution result; acquiring an initial service state of the system; according to the Viterbi algorithm module, the model initial parameter and the service state sequence length, performing backtracking analysis on the initial service state to obtain a target service state sequence of the system; through the target hidden Markov model, fault recovery and intervention are brought into the event and even before the event from post-event remedy, and the maintenance capability and the service continuity guarantee capability of the system are improved.

The invention relates to the technical field of nonferrous metal beneficiation intelligent control, and discloses a lead zinc ore flotation process state evolution modeling method. The method comprises the following steps: collecting multi-source heterogeneous data of a flotation process, preprocessing the multi-source heterogeneous data, then obtaining a plurality of key features, and constructing a feature matrix according to the plurality of key features; constructing a hidden Markov model based on the hidden state of the flotation process, inputting the feature matrix to the hidden Markov model, optimizing parameters of the hidden Markov model through a Baum-Welch algorithm, and screening evolution models in a training process in combination with a Bayesian information criterion; and acquiring real-time multi-source heterogeneous data of the flotation process and acquiring a corresponding feature matrix, inputting the feature matrix into the evolution model, and acquiring an optimal process state sequence in combination with a dimensional bit algorithm. The problem that an existing beneficiation model cannot effectively and accurately predict the flotation process state is solved.

The invention provides a bearing temperature vibration signal fault evolution path intelligent identification method and system, and relates to the technical field of fault identification, and the method comprises the steps: carrying out the collection and time sequence alignment of bearing temperature, vibration signals and working condition parameters, and constructing a multi-source heterogeneous data matrix; multi-dimensional features are extracted after self-adaptive noise reduction processing; constructing a fault evolution mechanism causal association network by adopting a causal inference model; performing time sequence clustering based on the network to divide health state clusters, and establishing a state transition model by using a hidden Markov model; and finally, decoding by using a Viterbi algorithm to obtain an optimal fault evolution path. The method can effectively identify the bearing fault evolution law and improve the prediction precision.

The invention discloses an SOQPSK demodulation performance monitoring method and system based on upper computer visual feedback. An SOQPSK signal is demodulated by adopting a maximum likelihood sequence detection method based on a Viterbi algorithm; removing the influence of a phase pulse function through matched filtering processing, extracting I / Q data of a fixed sampling point in each symbol period, carrying out time domain superposition, and generating eye pattern data in real time; based on the mapping relation between the grid state variable of the SOQPSK demodulator and the CPM phase state, the maximum survival state in the Viterbi algorithm is used as a phase value, and constellation diagram data is generated in real time in combination with the survival path measurement increment; and packaging the eye diagram data and the constellation diagram data to an upper computer for display, performing performance parameter evaluation and feeding back to a demodulator. The FPGA generates eye diagram and constellation diagram data in real time and sends the eye diagram and constellation diagram data to the upper computer for display and performance evaluation, and visual performance monitoring is provided. And parameters of the demodulator are adjusted in real time, so that a closed loop is integrally formed.

The application belongs to the technical field of underwater acoustic, and discloses a line spectrum detection front tracking method and a multi-target distinguishing method based on signal space transformation. The track energy accumulation value on the slice obtained after signal space transformation is constructed as a cost function in a particle swarm parameter optimization algorithm, so that the complexity of slice search in the transformation space is reduced, and the calculation amount is greatly reduced. Meanwhile, a hidden Markov model is established on the slice, and a Viterbi algorithm is used to track the track, compared with the method of using a Radon algorithm to integrate on the slice, the selection of the integration path is more accurate, and the processing gain is improved. The method improves the detection probability, tracking accuracy and parameter optimization speed of the uniform motion target under low signal-to-noise ratio. The searched parameters can be used as the characteristics of the target to distinguish the target, and multi-target distinguishing is realized.

This application proposes a GPS-based method, device, and application for calculating real-time bus traffic conditions, including the following steps: S00, obtaining vehicle GPS data and road segment data for the current period, using the vehicle's road mileage as the actual mileage for the current period; wherein the road segment data is data consisting of a series of connected coordinate points; S10, performing exception processing on the vehicle GPS data to obtain valid vehicle GPS data; S20, using the Viterbi algorithm to match each GPS point to the coordinate point based on the distance between the GPS point in the vehicle GPS data and each coordinate point in the road segment data, and calculating the road segment speed for the current period based on the matching results; S30, using the average speed of each vehicle passing through the road segment as the average speed of the current road segment and outputting it. This application can produce a more accurate analysis of real-time bus traffic conditions.

The invention relates to a robot positioning method and device in a degraded tunnel scene, and belongs to the technical field of robot positioning.The robot positioning method in the degraded tunnel scene comprises the steps that prior path information and road sign structure position information are obtained from a tunnel design drawing, constructing a path likelihood model, a relative distance constraint model and a pose constraint model; fusing the path likelihood model, the relative distance constraint model and the pose constraint model based on a particle filtering algorithm to obtain an odometer pose calculation result of the robot; extracting a multi-fine-grained feature from a tunnel side view image collected by a camera arranged on the robot, and carrying out loopback detection based on a Viterbi algorithm and the multi-fine-grained feature to obtain a loopback detection pose calculation result of the robot; and determining the optimal estimation of the pose of the robot based on the odometer pose calculation result and the loop-back detection pose calculation result. According to the invention, high-precision positioning of the robot in a degraded tunnel scene can be realized.

The application provides a bearing temperature and vibration signal fault evolution path intelligent identification method and system, relates to the technical field of fault identification, and comprises the following steps: collecting and time-aligning bearing temperature, vibration signals and working condition parameters to construct a multi-source heterogeneous data matrix; extracting multi-dimensional features after adaptive noise reduction processing; constructing a fault evolution mechanism causal correlation network by using a causal inference model; performing time series clustering to divide health state clusters based on the network and establishing a state transition model by using a hidden Markov model; and finally applying a Viterbi algorithm to decoding to obtain an optimal fault evolution path. The method can effectively identify the bearing fault evolution law and improve the prediction accuracy.

This invention discloses an automatic construction method for catenary support equipment archives based on multi-frame visual sequence alignment, belonging to the field of railway operation and maintenance technology. The method includes: acquiring trackside inspection videos; segmenting the frame data sequence based on the area change trajectory of the pole boundary frame to obtain several pole trajectories compressed into candidate pole nodes; extracting representative frames, kilometer marker area characters, license plate area characters, and pole type labels to obtain a candidate pole node sequence arranged by time; acquiring pre-stored real structured trackside data; constructing a key point dictionary based on the uniqueness of kilometer markers; generating a real pole number sequence arranged in line order; scoring all video frames covered by the candidate pole nodes frame by frame; using the Viterbi algorithm to solve the globally optimal alignment path from the candidate pole node sequence to the real pole number sequence; and generating catenary support equipment archives. This invention solves the problems of low accuracy in catenary support equipment archive construction, inability to effectively handle missed detections, false detections, and disordered sequences.

The application provides a farmland feature extraction method based on texture analysis, and belongs to the technical field of remote sensing data processing.The application extracts multi-direction and multi-scale gray level co-occurrence matrix texture feature parameters by constructing a block integral graph to form an initial texture feature vector, constructs a Riemann kernel function matrix by using Riemann geodesic distance calculation, and realizes texture feature dimension reduction by principal component projection in a Riemann manifold tangent space.The reduced texture feature vector is encoded as a genetic algorithm chromosome individual, and the optimal texture feature subset is obtained by fitness evaluation and evolution operation.The optimal texture feature subset of multi-temporal images is used to construct a hidden Markov model, and the optimal state sequence path is searched by using the Viterbi algorithm to realize farmland feature time sequence recognition.After morphological post-processing, farmland feature data is output, and the problem that high-dimensional feature redundancy leads to low feature classification accuracy during farmland remote sensing image texture feature extraction is solved.

The present application belongs to the technical field of radar, and particularly relates to a bird wing-flapping frequency extraction method based on Doppler radial acceleration. The present application firstly tracks the instantaneous frequency trajectory of the time-frequency analysis result by using the Viterbi algorithm, dynamically searches for the best path, and thus effectively extracts the signal instantaneous frequency; then performs differential processing, converts the instantaneous Doppler information into Doppler radial acceleration; and finally sets an adaptive threshold, counts the wing-flapping times of the bird, and thus realizes the extraction of the wing-flapping frequency of the bird. The present application proposes a bird wing-flapping frequency extraction method based on Doppler radial acceleration, which provides an effective means for the extraction of the wing-flapping frequency of the bird. Compared with the existing bird wing-flapping frequency extraction method, the present method can greatly improve the success rate and precision of the extraction of the wing-flapping frequency of the bird under the condition of low signal-to-noise ratio, and will be helpful for the bird target recognition of the radar.

The invention belongs to the technical field of causal traceability, and particularly discloses a complex event relation causal traceability method based on subgraph evaluation, which comprises the following steps of: firstly, performing data preprocessing on input event relation data by a system, constructing a directed graph by utilizing purified data, and then, according to a received target tail event needing to be traced, establishing a source of the target tail event; performing multi-path hierarchical backtracking search in the directed graph to obtain a candidate source event set and a corresponding optimal path, then extracting causal relationship sub-graphs corresponding to different source events, then performing sub-graph evaluation, performing analysis to obtain corresponding event development context sub-graphs and key nodes in a causal evolution path, and finally obtaining the event development context sub-graphs and the key nodes in the causal evolution path. And causal tracing in the complex event relation network is completed. According to the method, the causal traceability efficiency of the complex event relation network can be improved according to the thought of the Viterbi algorithm and in combination with subgraph evaluation, and comparison and screening of the optimal source node and the corresponding optimal development path are realized by constructing a complete cause subgraph quality evaluation system.

The application discloses a skipping counting detection method based on laser radar area recognition, and relates to the technical field of motion monitoring, which comprises the following steps: continuously scanning each effective detection ROI area to obtain original point cloud data, and acquiring time sequence point cloud data through preprocessing; training a multiple hidden Markov model based on the time sequence point cloud data, and independently modeling the state of a rope in parallel, and solving the optimal state sequence of each rope through a Viterbi algorithm; based on the optimal state sequence, applying Bayesian filtering to dynamically optimize cycle parameters, and acquiring a complete counting sequence through interpolation counting; performing event counting statistics on the complete counting sequence, aligning through a time window, mapping the effective detection ROI area, and outputting the independent counting value of each person. Through the parallel independent modeling mechanism of the multiple hidden Markov model, the application realizes accurate separation and recognition of a multi-person skipping scene; through the Viterbi algorithm, the optimal state sequence is solved, and the recognition accuracy and stability are maintained.

The invention provides a traffic network extraction method and device suitable for high-noise trajectory data, and the method comprises the steps: carrying out the iterative execution of a path extraction process based on a density grid map of the trajectory data, and extracting a plurality of path center lines, thereby obtaining a traffic network. In a path extraction process, a Markov probability model is used for modeling a tracking process, and a tracking step length is adaptively calculated based on a bending degree of a trajectory so as to deal with a Markov chain interruption problem, so that stronger robustness is achieved when path structures with different widths and curvatures are tracked; then, for a candidate point set of each local path center point, based on a density grid map, adaptively quantizing the deviation degree of candidate points from the path center so as to solve the problem of path center estimation under the condition of non-uniform track distribution; and finally, a Viterbi algorithm is introduced, local measurement errors caused by noise are considered, a path center line is accurately deduced through global joint probability optimization, the problem of complex parameter setting in different scenes in the prior art is solved, and the extraction accuracy is improved.

This invention discloses a method and apparatus for heart sound segmentation based on a Hidden Markov Model (HMM) cardiac cycle. The method involves: extracting the signal envelope from the heart sound signal using Hilbert's algorithm; obtaining the peak positions of the first heart sound (S1) and the second heart sound (S2) after Hilbert envelope extraction based on preset baselines for different leads; locating the peaks based on the cardiac cycle; extracting the diastolic phase based on an improved HMM; locating the optimal time span of heart sound signals S1 and S2 using an improved Viterbi algorithm; and segmenting the original heart sound signal using the time span and the peak positions of S1 and S2. This invention employs an improved HMM and an improved Viterbi forward algorithm to calculate the duration of heart sound intervals S1 and S2, combined with the cardiac cycle, to accurately locate the peak positions of heart sound intervals, thus improving the performance of heart sound segmentation.

The invention discloses a rope skipping counting detection method based on laser radar area identification, and relates to the technical field of motion monitoring, and the method comprises the steps: carrying out the continuous scanning of each effective detection ROI area, obtaining original point cloud data, and obtaining time sequence point cloud data through preprocessing; a multi-hidden Markov model is trained based on the time sequence point cloud data, parallel independent modeling is carried out on the states of the ropes, and the optimal state sequence of each rope is solved through a Viterbi algorithm; based on the optimal state sequence, applying Bayesian filtering to dynamically optimize periodic parameters, and obtaining a complete counting sequence through interpolation counting; and performing event counting statistics on the complete counting sequence, and outputting an independent counting value of each person through time window alignment and effective detection ROI mapping. According to the invention, through a parallel independent modeling mechanism of the multi-hidden Markov model, accurate separation and identification of a multi-person rope skipping scene are realized; the optimal state sequence is solved through the Viterbi algorithm, and the recognition accuracy and stability are kept.

Systems and processes are disclosed for a multi-layered approach to fraud prevention by leveraging a machine learning engine integrated with the Session Initiation Protocol (SIP) to attempt caller identification before transitioning to a voice call, allowing for the potential blocking of unwanted calls. If SIP-based identification remains inconclusive, an anomaly detection engine employing the Viterbi algorithm analyzes the caller's speech patterns during voicemail messages. The Viterbi algorithm converts spoken language into text, identifying suspicious characteristics such as unusual speech patterns, inconsistencies, and keywords associated with scams. If suspicious characteristics are detected, the system automatically blocks callback attempts and notifies the customer of potential spam or unwanted calls. This proactive approach addresses both live and recorded fraudulent calls, enhancing the security of telecommunications by preventing fraudulent interactions before they can cause harm. The system continuously learns from new data, adapting to evolving fraud tactics, providing robust, long-term protection for telecommunications users.

This invention relates to the field of safety detection technology, specifically to a multi-source fusion closed-loop safety monitoring method for salt cavern gas storage facilities applicable to high-frequency injection and production conditions. In this invention, the Mankendall trend test outputs trend direction labels and significant trend indicators on the cavity pressure change value sequence, the annular pressure change value sequence, and the event increment value sequence. The trend direction labels are combined with the consistent out-of-bounds item count to form a stability direction discrimination sequence. The Viterbi algorithm outputs a time step hidden state label sequence based on the stability direction discrimination sequence and completes the location of continuous consistent sections. The location of continuous consistent sections separates short-term fluctuations from persistent anomalies and reduces the frequency of triggering actions under high-frequency injection and production conditions. The hidden state label sequence and the dominant direction of the section are mapped to the differential pressure reduction amount, the upper limit contraction amount, and the pressure stabilization extension amount to form an injection and production control action set. The action parameters are bound to the number of execution cycles and solidified into the execution trajectory of the operating state.

The invention discloses a service state identification method and device and electronic equipment. Relates to the big data field. The method comprises the steps that a trusteeship fund allocation instruction sequence sent by a user is received, a classification variable sequence of the trusteeship fund allocation instruction sequence is generated, and the trusteeship fund allocation instruction sequence comprises M trusteeship fund allocation instructions; target parameters in the probability prediction model are obtained, and the target parameters comprise an initial probability vector representing an initial state probability, a state transition probability matrix representing a state transition probability and an observation probability matrix representing an observation probability; and calculating the target parameter and the classification variable sequence through a Viterbi algorithm to obtain a service state sequence corresponding to the trusteeship fund allocation instruction sequence. According to the method and the device, the problem of relatively low accuracy and efficiency of manually determining the operation state of the business indicated by the instruction in the related technology is solved.

The application relates to a high-frequency vibration compensation method for a SAR platform in a terahertz wave band, and aims to solve the problem of platform high-frequency vibration error compensation in the imaging process of a terahertz SAR, which can seriously affect the imaging quality, cause defocusing along the azimuth direction and result in the problem of platform high-frequency vibration error compensation in the imaging process of the terahertz SAR. The process comprises the following steps: 1, obtaining a sinusoidal frequency modulation signal; 2, obtaining a time-frequency distribution function to determine the corresponding relationship between discrete time points and frequency points; 3, extracting an instantaneous frequency by using a Viterbi algorithm; 4, estimating an instantaneous frequency error parameter introduced by high-frequency vibration of a SAR platform by using a nonlinear least square method; and 5, constructing a compensation function by using the estimated instantaneous frequency error parameter introduced by high-frequency vibration, compensating the high-frequency vibration of the SAR platform by using the compensation function and obtaining a final imaging result. The application is used in the field of radar technology.

The application relates to the technical field of speech recognition, and discloses a method, device and equipment for rejecting an out-of-set word and a medium, wherein the method comprises the following steps: performing forced alignment on a current speech segment recognition result and a target command word to obtain an alignment path, the process being based on dynamic programming, Viterbi algorithm and combined with a CTC criterion; determining a key interval according to the alignment path, determining and counting error line counts according to two types of alignment results of blank phonemes and target command word phonemes; locating a key phoneme pair containing a position association in combination with the alignment path and a target command word phoneme sequence feature; calculating a position distance of the key phoneme pair and judging whether the position distance is abnormal; if the error line count exceeds a set threshold value or the position distance is abnormal, the out-of-set word is determined and is rejected, otherwise, the effective command word is determined. The application does not need to retrain a model, is suitable for low-resource devices, is simple to calculate, occupies few resources, can accurately identify similar out-of-set words, reduces the misrecognition rate, improves the accuracy of voice interaction, and meets the accurate control requirements of smart homes.

The application discloses a multi-stage attack detection algorithm based on Gaussian mixture hidden Markov and transfer learning, and belongs to the technical field of network security. Firstly, GMM is used to cluster alarm data in a high-dimensional space, and true threat alarms are clustered from mixed alarms; combined with HMM, the continuity of MSA, unique alarm features of each stage and conversion information between stages are fully considered, and the problem that the learning of the model on alarm features is not comprehensive due to complex MSA is solved; secondly, the optimization Baum-Welch algorithm and the optimization Viterbi algorithm of the training model parameters are used to solve the recognition and prediction problems of the traditional HMM when facing complex multi-stage attacks and improve the performance of the model; finally, the improved TL method is used to fine-tune the GMM-HMM model parameters, and the KL divergence is added as a penalty term in the training algorithm to reduce the distribution difference between the source domain and the target domain, so that the deviation problem in the TL process is better solved.

The present application relates to a kind of adaptive band optimization chorus sound separation method and system based on harmonic maintenance, first, the signal is collected by microphone array and time delay compensation and multi-channel time-frequency transformation are carried out;Sound source spatial positioning and initial band division are carried out using MUSIC algorithm;Using the greedy optimization strategy, the band boundary is dynamically adjusted and optimized by maximizing the objective function including signal-to-noise ratio and harmonic integrity measure;Then, the fundamental frequency is obtained by harmonic analysis and detection, and the time-varying harmonic trajectory is tracked across frames by Viterbi algorithm;On this basis, combined with MVDR beam forming and the introduction of harmonic maintenance factor, enhanced time-frequency representation is obtained by soft time-frequency mask;Finally, inverse short-time Fourier transform time-domain reconstruction and synchronous harmonic phase are carried out.The present application realizes the accurate allocation of voice part spectrum, effectively reduces the overlap interference, protects the overtone column of human voice while accurately separating, significantly improves the timbre fidelity and naturalness of separated voice part.