254results about How to "Avoid filtering" patented technology

Disclosed are techniques for preventing extraction of original audio tracks from a song. The techniques are executed on a game platform and involve providing a first and second audio track representing parts of a musical composition, mixing the first audio track and the second audio track to provide a mixed audio track, generating an audio modification data comprising a series of substantially random audio modifiers, and then modifying, before playback, the mixed audio track based on the audio modification data to provide a modified mixed audio track, such that subtracting the second audio track from the modified mixed audio track produces a third audio track with an audibly detectable deviation from the first audio track.

The invention brings forward a frequency domain three-dimensional irregular earthquake data reconstruction method. The method is characterized in that first of all, three-dimensional earthquake data in a time domain is converted to a frequency domain by use of Fourier transform, and then, a projection onto convex set (POCS) algorithm is employed and curvelet transform capable of describing localized features of the earthquake data is introduced; and in an iteration process, a new threshold parameter attenuating according to an index rule is brought forward, and each frequency slice is individually reconstructed by use of a soft threshold operator, such that the iteration frequency is reduced, the reconstruction precision is improved, and the purpose of reconstructing the three-dimensional earthquake data is realized. According to the invention, the new threshold parameter attenuating according to the index rule is brought forward and each frequency slice is reconstructed in individually by use of the soft threshold operator, such that the disadvantage of quite slow convergence speed of a conventional threshold parameter is overcome, the calculation complexity of an algorithm is reduced, the calculation efficiency is substantially improved, and the operation time is reduced.

The invention discloses a microwave photonic zero-intermediate-frequency receiving device and method. The method relates to the technical field of microwave and the technical field of optical communication. The method is as shown in the drawings. The device comprises a laser (LD), a polarization multiplexing Mach-Zehnder modulator (PDM-MZM), an erbium-doped optical fibre amplifier (EDFA), a wavelength division multiplexer (WDM), polarization controllers (PCs), a polarization beam splitter (PBS) and balance photoelectric detectors (BPDs). Modulation and polarization multiplexing of radio-frequency (RF) and local oscillator (LO) signals are carried out by utilization of the PDM-MZM; the WDM separates upper and lower optical sidebands; the PCs are respectively utilized for adjusting the polarization states of optical signals; and finally, the two BPDs respectively output I-channel and Q-channel baseband signals. By means of the microwave photonic zero-intermediate-frequency receiving device and method disclosed by the invention, zero-intermediate-frequency receiving is realized through a photonic method; the electronic bottleneck in the traditional electric field technology can be overcome; and the microwave photonic zero-intermediate-frequency receiving device has the advantages of being wide in working band, high in IQ balance degree, inhibited in direct-current offset and even-order distortion, electromagnetic-interference-resistant and the like.

The invention discloses a uniform resource locator (URL) filtering method. The URL filtering method comprises the steps: judging whether a status code of hypertext transfer protocol (HTTP) response information belongs to a redirection status code; if the status code belongs to the redirection status code, judging whether a URL of the HTTP response information matches a preset URL; and if the URL matches the preset URL, blocking the URL. The invention further discloses a URL filtering device.

In a hybrid vehicle including: an engine having an exhaust system in which a filter that removes particulate matter is provided; a motor configured to generate a driving force for the hybrid vehicle; a power storage device configured to exchange an electric power with the motor; and an electronic control unit configured to control the engine and the motor. When an accumulation amount of the particulate matter of the filter is equal to or more than a predetermined accumulation amount, the electronic control unit is configured to permit fuel cut of the engine when a temperature of the filter is lower than a predetermined temperature, and the electronic control unit is configured to prohibit the fuel cut of the engine when the temperature of the filter is equal to or higher than the predetermined temperature.

The present invention discloses hydrothermal process of preparing nanometer hydroxyapatite colloid. The preparation process includes the following steps: 1. dissolving citrate of 0.774-309.6 weight portions and calcium salt of 1.64-262.6 weight portions in water of 200-5000 weight portions to compound solution A; 2. dissolving phosphate of 0.894-357.6 weight portions and forming Ca/P weight ration of 1.5-1.67 in water of 50-1200 weight portions to compound solution B; 3. heating solution A to 20-60 deg.c, preferably to 40-50 deg.c, and dropping solution B to solution A in 5-60 min; 4. heating after dropping to 60-100 deg.c while stirring to react for 2-6 hr to obtain nanometer hydroxyapatite colloid particles dispersed stably in water phase; and 5. ultrafiltering to eliminate salt from the nanometer hydroxyapatite colloid solution until reaching the filtrate conductivity of 20-200 microsecond/cm to obtain the purified nanometer hydroxyapatite colloid solution.

The invention discloses a user behavior fine classification method and system of a mobile application private encryption protocol. The method comprises the following steps: 1) collecting the flow of amobile application, and then identifying the private encryption protocol flow from the collected flow according to set private encryption protocol characteristics; 2) collecting flow data of a set user behavior category from the identified private encryption protocol flow, and labeling the flow data; 3) generating a training set, a verification set and a test set according to the flow data collected and marked in the step 2); 4) performing feature extraction on the flow data in the three sets, and converting the flow data into feature vectors; 5) setting hyper-parameters of the selected classifier, and training the selected classifier; 6) verifying the training classifier by utilizing the feature vectors corresponding to the verification set, and 7) classifying the classifier on the testset, and if the set standard is met, classifying the mobile application traffic to be processed by utilizing the classifier.

The invention discloses a magnetotelluric signal denoising method based on noise discrimination, which comprises the following steps: calculating approximate entropy and LZ complexity of each electromagnetic signal sample; using the approximate entropy, LZ complexity and class value of each electromagnetic signal sample to train the preset classification model to get the noise discrimination classification model; acquiring magnetotelluric signals to be processed, and performing noise screening on the magnetotelluric signals to be processed according to the noise screening classification modelto obtain electromagnetic signal segments with non-strong interference and electromagnetic signal segments with strong interference; combining the empirical mode decomposition of complementary set andwavelet threshold method, the strong disturbance electromagnetic signal being suppressed; the reconstructed magnetotelluric signal being obtained by combining the de-noising suppressed electromagnetic signal with the non-strong disturbance electromagnetic signal. The method of the invention can more accurately discriminate the data segments with strong interference and non-strong noise interference, retain the real magnetotelluric signal, and improve the denoising effect of the magnetotelluric signal.

The present invention relates to a method and system of solving an internet of things multi-message channel control message conflict. The method and the system of the present invention consider the repeated message filtering based on user scenes, the message priority arrangement and the conflict detection and processing. The method of the present invention comprises the steps of marking a control source as abnormal if the control source sends the repeated control messages continuously, not processing the control messages sent by the control source any more until the abnormal mark is released automatically due to time-out or is released manually by users; bringing the attributes of the control messages in control message queues; separately scanning the control message queues, and according to the identifiers and the attributes of the control objects, marking the control messages having the conflicts; using a priority formula based on user scenes to calculate the indexes of the control messages, scanning the control message queues, and uniformly processing the control messages reaching the control message processing effectiveness. According to the present invention, the control message conflicts under the multi-control source and multi-message channel environments can be processed.

The invention discloses a method and device for demodulating a distributed optical fiber vibration sensing system. The method comprises that two continuous ultra-narrow linewidth lasers with the sameoptical power are subjected to acousto-optic modulation and electro-optic modulation to be converted into two pulsed light signals; the two pulsed light signals are input into a sensing fiber at an interval of set pulse width; the backward Rayleigh scattered light of the two pulsed light signals generate a set frequency difference such that the returned Rayleigh light signals exhibit sinusoidal interference fringes; when a disturbance signal has an effect on the sensing fiber, the phase difference of the returned Rayleigh light signals changes, and the vibration waveform and position sensed bythe sensing fiber are obtained according to the phase difference. When the disturbance signal appears, a detector can quickly obtain the position of the disturbance signal and the intensity of the disturbance signal, which solves the problem that the demodulation algorithm of a [phi]-OTDR system is complex and a laser frequency drifts, and guarantees that the positioning error of the system is within +/-1m.

The invention relates to a filter-free permanent magnet synchronous motor rotor initial position identification method and belonging to the field of motor control to solve the problems that an existing permanent magnet synchronous motor rotor initial position identification process is low in precision and has an identification result affected by the amplitude and the frequency of an input signal and a filter has an influence on the stability of the system. The method of the invention comprises inputting a high-frequency pulse vibration signal into the stator winding of the motor; obtaining a position deviation signal by subjecting a response current to coordinate transformation and signal processing; locking the position deviation signal to obtain a rotor position initial identification result [theta]<^>; determining the polarities of the N and S poles of the rotor by using a magnetic saturation effect so as to obtain a rotor initial position identification value. The filter is removedduring the identification process, which can suppress the influence of the filter on the system bandwidth and stability, and remove the influence of the amplitude and frequency of the input signal onthe identification accuracy. The algorithm is simple and reliable.

The invention discloses an audio howling suppression method, device and system and a neural network training method, and the method comprises the steps: obtaining a plurality of continuously collectedfirst audio frames in a time domain; converting the plurality of first audio frames into a plurality of second audio frames respectively, wherein the second audio frames are audio signals in a frequency domain, and each of the plurality of second audio frames comprises a plurality of frequency points; determining howling frequency points with howling signals in the plurality of second audio frames, wherein the howling signals are continuous, single-frequency and high-energy signals; in the second audio frame with the howling signal, removing the audio signal of the howling frequency point; inputting the frequency point signal near the howling frequency point in the plurality of second audio frames into the howling frequency point restoration neural network model, and outputting the restored howling frequency point replacement audio signal to replace the audio signal at the howling frequency point position. Howling signals are suppressed relatively easily and simply, fault of audio signals is avoided, and distortion of the audio signals is reduced.

The invention relates to a mechanical vibration signal feature extraction method based on combination of stochastic resonance and kernel principal component analysis. The method comprises the steps that firstly, the stochastic resonance method is applied for conducting pretreatment on rotor oscillation original signals measured by a sensor, the signal periodicity is improved, and the oscillation signal to noise ratio is improved; then, a time domain feature set is extracted for the pretreated output signals; then the kernel principal component analysis method is adopted for conducting nonlinear feature transformation for the extracted time domain feature set, and therefore the final needed feature set is obtained. The method is applied to feature extraction and failure diagnosis of simulated failure of an engine rotor, the result shows that the feature set extracted through the method is of linear independence, the number of dimensions is smaller, the separability is higher, the precision and efficiency of the failure diagnosis can be effectively improved, and application in engineering practice is facilitated.

The invention discloses a metabolism group method for distinguishing false positive mass spectra peak signals and quantificationally correcting mass spectra peak area. The invention provides a metabolism group study method; by the method, the biological source and non-biological source mass spectra peak signals can be effectively distinguished; the mass spectra peak signals are quantificationally evaluated; the mass spectra peaks with poor quantification performance are excluded; through QC sample dilution, a relative content correction model is built; the mass spectra peak area is corrected. The method has the maximum characteristics that the false positive mass spectra signals can be effectively eliminated, so that the metabolism group data becomes reliable; the real biomarkers can be favorably screened. The method can aim at plant, animal and microbe samples; the method can also be suitable for the mass-spectra-platform-based metabolism group analysis of GC-MS, LC-MS and CE-MS.

The invention discloses a target cell staining kit for displaying the proliferative activity of a cell and a use method thereof. The kit comprises I type and II type which respectively comprise an enzyme substrate, test paper, enzyme stationary liquid, phosphate buffer solution, Mayer hematoxylin and the like. The staining method comprises the steps of preparing pieces, fixing, staining and the like. The method can display acid phosphatase in exfoliative cells on smears such as exfoliative cervical cells, esophagus brush sheet cells and the like and search abnormal proliferated cells according to the target. Compared with the traditional Pasteur smear method, the method has the advantages of higher sensitivity for detecting cancer and precancerous lesions and similar specificity, therefore, the invention can be used for cytology screening of cervical carcinoma, esophageal cancer, lung cancer and other malignant tumors.

The invention relates to a water seepage structure and method. The water seepage structure comprises a water seepage well and a water permeation layer, wherein the water seepage well is vertically arranged in a soil layer of the ground; the water seepage well is filled with a flow guide object; the water seepage well infiltrates received water into an underground water layer through the flow guide object; the water permeation layer is arranged on the soil layer and covers a well mouth of the water seepage well; and the water permeation layer directly infiltrates surface water into the soil layer or guides the surface water into the water seepage well. The water seepage well is arranged on the ground, so that water in a ground surface layer can be quickly infiltrated into the underground water layer to quickly recover the underground water level, the cost is low, and the efficiency is high; the water seepage well is filled with the flow guide object, so that the seepage velocity of the water can be increased by utilizing a capillary tube principle; and the water permeation layer is arranged on the surface layer of the water seepage well, so that accumulated water can be prevented from being generated on the surface of the soil layer between water seepage wells.

The invention provides a message processing method and a message processing device. The method is applied to a network device on which an SSL VPN tunnel is established via a preset well-known port that is the register port of an L2TP. The method comprises the steps of when receiving a business message via the preset well-known port, determining the message type of the business message, wherein the message types comprise an L2TP type and an SSL VPN type; according to the message type, storing the business message into a Socket queue corresponding to the message type; and calling a processing progress corresponding to the Socket queue to carry out business processing on the business message in the Socket queue. With the application of the above embodiment, the SSL VPN and L2TP can share one well-known port, the SSL VPN type message is prevented from being filtered by the network device, so that the SSL VPN type message can enter the corresponding processing progress, and thus the SSL VPN type message is processed, and the user experience is enhanced.

The invention relates to a modular water curtain and photooxidation combined waste gas purifier which comprises a purifier box body and a fan box body. An air return passage is also formed between the purifier box body and the fan box body; one end of the air return passage is communicated with a clean gas outlet of the fan box body and the other end of the air return passage is communicated to the middle part of the purifier box body; the purifier box body is formed by splicing a water curtain purification module and a photooxidation purification module. The modular water curtain and photooxidation combined exhaust gas purifier has the benefits that by arranging the water curtain purification module in the purifier box body, the problem of filtering dust in waste gas is completely solved; the photooxidation purification module and double-layer metal porous filter plates arranged at both ends of the photooxidation purification module are utilized to carry out sufficient and complete decomposition and filtering on the waste gas, so that purification purity is improved; by purifying and recycling sewage, not only are water resources saved, but also use cost is greatly reduced.

The invention discloses a control system and a control method of a three-phase four-bridge-arm inverter based on phase-locked loop sequencing. The control method comprises the following steps: firstly, decomposing three-phase asymmetric voltage and inductive current output by the three-phase four-bridge-arm inverter into positive sequence, negative sequence, zero sequence voltage and current components by adopting a symmetric component method; secondly, performing proper coordinate rotation transformation on the extracted negative-sequence and zero-sequence components; converting the negative-sequence and zero-sequence components into negative-sequence and zero-sequence components under a positive-sequence coordinate system; then, using synchronous rotation coordinate transformation basedon a phase-locked loop; converting the extracted positive-sequence, negative-sequence and zero-sequence components into a dq0 rotating coordinate, then performing inverse Park and inverse Clark conversion on the three-sequence components subjected to double-loop PI control, and superposing the three-sequence components to obtain an instantaneous reference voltage of a three-dimensional space vector modulation algorithm. According to the method, the conversion algorithm of the negative sequence component of the traditional double-synchronous rotating coordinate system is effectively simplified,and the adjustment time is reduced, so that the system tends to be stable more quickly.

The invention provides an adaptive angle tracking method based on a digital phase-locked loop. The method comprises steps that rapid Fourier transform is utilized to transform time domain signals of a sum beam and a difference beam to a frequency domain, and the monopulse angle measurement technology is then utilized to acquire an angle error; the angle error is then sent to a loop filter of which loop equivalent noise bandwidth changes along with target angle change to acquire a filtering value of the angle error, the filtering value is accumulated to a numerical control oscillator, and adaptive target angle tracking is realized. The method is advantaged in that an angle error convergence speed and angle tracking precision in a target angle tracking process are improved.