88 results about "Phase filter" patented technology

The invention provides a time-varying structure vibration signal decomposition method based on experience multiple synchronous extraction, and the method comprises the steps: carrying out the frequency spectrum segmentation through searching a sudden change point of the internal and external energy of a characteristic frequency band in a signal time-frequency spectrum, so as to complete the time-varying signal decomposition: firstly, obtaining the time-frequency spectrum of a signal through the multiple synchronous extraction transformation; summing the time-frequency coefficients of all moments at each frequency position to obtain time-frequency total energy; searching an energy boundary by using an energy segmentation operator, and performing Fourier transform on the signal to obtain a signal frequency spectrum; then, combining a zero-phase filter and an energy boundary position, and extracting a frequency band corresponding to the single-mode signal; and finally, inverse Fourier transform is carried out on each section of frequency spectrum, a single-mode signal is reconstructed, and modal decomposition of the time-varying structure is realized.

The invention provides a multiphase filtering sampling method suitable for satellite communication. The method comprises the following steps: receiving an original modulation signal and converting the original modulation signal into a digital signal sequence; extracting a signal feature vector and generating a processing configuration parameter; performing orthogonal decomposition to generate I / Q signal pairs and performing oversampling; initializing a multi-phase filter and generating an optimal filter coefficient; carrying out phase calibration and filtering; determining an interpolation coefficient and executing multi-stage integer interpolation and mixed precision fractional interpolation; configuring a dynamic cache system; phase reordering and synthesis are executed; spectral analysis is performed and optimization parameters are generated. According to the invention, high-precision signal processing is realized, the adaptive capability and the efficient resource utilization characteristic are realized, and the performance of a satellite communication system is remarkably improved.

The invention discloses a sampling rate conversion device and method and an audio playing system, the sampling rate conversion device comprises a signal sampling unit, a filter coefficient generation unit and a multiphase filter convolution unit, the signal sampling unit samples an input signal based on an extraction factor to obtain a target input sampling point, and the multiphase filter convolution unit carries out convolution on the target input sampling point; a filter coefficient generation unit determines a target filter coefficient and a historical filter coefficient according to the sampling point address information of the target input sampling point and a multi-phase filter basic coefficient table; and the multi-phase filter convolution unit performs convolution operation based on the target input sample point, the historical sample point, the historical filter coefficient and the target filter coefficient to obtain an output sample point. As the output sample point is obtained by performing convolution operation on the target input sample point, the historical sample point, the historical filter coefficient and the target filter coefficient, up-sampling can be realized without using an interpolation filter, and down-sampling can be realized without using the interpolation filter, so that the conversion step can be simplified, and the conversion efficiency can be improved.

The invention discloses an InSAR (Interferometric Synthetic Aperture Radar) phase filtering method based on a plurality of interferograms, which comprises the following steps of: preprocessing acquired main and auxiliary SAR images to obtain the plurality of InSAR interferograms; dividing the plurality of InSAR interferograms into square interferogram patches along the azimuth direction and the distance direction; converting each interferogram patch from a spatial domain into a frequency domain signal, and constructing a corresponding frequency spectrum amplitude diagram; using a K-means clustering method to cluster and extract an initial low-pass filter in the spectrum amplitude diagram, and constructing a phase filter together with a Kaiser window function; the frequency domain signals of the interferogram plaques pass through a phase filter, the signal frequency band power is reserved, the noise at the high-frequency position is filtered out, meanwhile, the noise at the low-frequency position is filtered out through smoothing operation, and the filtered frequency domain signals are obtained; and the filtered frequency domain signals are converted to a spatial domain, filtered interferogram patches are obtained and spliced, and a filtered InSAR interferogram is obtained. The method is beneficial to popularization and promotion of the development of the current time sequence InSAR interferometry technology and the application in engineering.

The invention belongs to the technical field of electronic search, and relates to a radio reconnaissance method and system based on multichannel parallel processing and intelligent clustering, and the method comprises the steps: carrying out the multi-phase filtering digital channelization processing of a broadband radio signal, so as to obtain adjacent channel sequences with overlapped frequency bands; performing square law detection and constant false alarm detection on each channel sequence to generate an initial pulse description word; establishing a candidate corresponding relationship in adjacent channels based on arrival time similarity and noise consistency, and determining a cross-channel merging relationship according to frequency range continuity and frequency-time relationship slope consistency to generate a complete pulse description word; performing hierarchical clustering sorting based on the arrival angle and the pulse width; and performing multi-stage differential analysis on a clustering result to extract a repetition frequency sequence and determine a repetition frequency type. According to the technical scheme, the stability and consistency of cross-channel pulse merging and sorting results can be kept under the broadband high-density condition, and the radio search processing precision under the complex electromagnetic environment is improved.

The invention discloses a broadband low-power-consumption receiving and transmitting shared phase shifter which comprises a differential signal common port, a frequency sampling and control circuit, a dual-mode orthogonal generation circuit and a passive vector modulation synthesis circuit. The differential signal common port comprises a common input / output port interface of RF + and RF-differential radio frequency signals; the frequency sampling and control circuit is composed of a frequency sampling circuit, a frequency detection circuit and a logic control unit. The dual-mode orthogonal generation circuit is composed of a frequency selection change-over switch, a multi-phase filter, a coupling transformer, a matching network 1 and a matching network 2. The passive vector modulation synthesis circuit is composed of two passive vector modulation arrays and two combining / power dividing circuits.

Dispersion compensating phase filters, their method of manufacture and use are presented. The phase filters are designed to compensate for chromatic dispersion accumulated by a telecommunication optical signal when travelling in a dispersive line. The phase filter is made by first determining a target dispersion compensating phase profile of a channel of the telecommunication optical signal. This determination involves discretizing the phase profile of the dispersive line into a plurality of frequency sub-bands over a bandwidth of the channel, each frequency sub-band having a width selected on view of compensating the chromatic dispersion. For each frequency sub-band, an average phase value of the phase profile of the dispersive line is computed, and then converted to an equivalent 2Pi-bound phase value, used in building the target dispersion compensating phase profile. A spectral filtering structure embodying the target dispersion compensating profile is manufactured.

The invention discloses a control method and system for a network-building type energy storage converter. The control method comprises the following steps: acquiring a three-phase filter inductance current value of the network-building type energy storage converter in real time; according to the three-phase filter inductance current value, determining the working state of the grid-forming type energy storage converter; when the converter is in an overload operation state, outputting switching frequency trigger adjustment information to adjust the switching frequency of the switching device to a first switching frequency, and outputting modulation switching trigger information to switch a first modulation mode to a second modulation mode; obtaining a first three-phase filtering inductive current maximum value according to the three-phase filtering inductive current value; switching frequency recovery information is output according to the first three-phase filter inductive current maximum value so as to adjust the switching frequency of the switching device to a second switching frequency; and outputting modulation mode switching information according to the second switching frequency so as to switch the second modulation mode to the first modulation mode, thereby enabling the converter to enter a stable operation state. Therefore, the short-time overload capacity of the grid-forming type energy storage converter is improved.

The invention belongs to the technical field of digital communication, and particularly relates to a multi-phase filtering channelized ultra-wideband signal detection and fusion method and system.The multi-phase filtering channelized ultra-wideband signal detection and fusion method comprises the steps that channelization is conducted, specifically, a receiving bandwidth is evenly divided into K sub-channels, 50% overlapping is adopted between every two adjacent sub-channels, the method comprises the following steps: designing an appropriate prototype filter according to frequency response, determining a multiphase filter coefficient according to the number of sub-channels and the prototype filter, carrying out D-time extraction at the front end of the multiphase filter, enabling the extracted signal to enter the multiphase filter for filtering, and then carrying out fast Fourier inverse transform on K points output each time to obtain output signals of K sub-channels, time domain amplitude detection: acquiring arrival time and pulse width information of the signal in a time domain; according to the method, the problems of missing detection and feature detection errors of multiple time domain overlapped signals in a single channel are solved, and accurate broadband signal parameters are obtained by using the corresponding relationship between the signal frequency domain and the channel passband.

The invention discloses a power line communication signal sending and receiving method and device based on a semi-parallel architecture, and belongs to the technical field of power system communication. The method comprises the following steps: obtaining a sending signal comprising a plurality of sub-signals, dynamically determining the number R of parallel processing units according to a transmission data rate and a clock frequency, phase adjustment, frequency domain transformation, linear combination and filtering processing are carried out through R parallel processing units in the DCT module, the matrix module and the multi-phase filter module in sequence, and finally processed signals are serialized and sent to a power line channel; and the receiving process reversely executes corresponding processing. Therefore, by implementing the method and the device, the problem that the transmission rate and the communication stability of the system are difficult to effectively improve while low resource consumption and low power consumption are ensured in the prior art can be solved.

One example system for detecting an emergency siren comprises a microphone device, a band pass filter operably coupled to the microphone device and configured to filter sound data from the microphone device to produce filtered sound data, a phase lock loop circuit configured to phase filter the filtered sound data to produce phase filtered data, and a processor configured to determine a presence of a siren signal from the phase filtered data.

The invention discloses an active phase shifter with temperature compensation. The active phase shifter comprises an input transformer balun, a multi-phase filter, a vector modulation module based on a Gilbert unit, an output transformer balun and a positive temperature coefficient current source, the input transformer Balun is used for converting a single-ended signal of an input end into a differential signal; the multi-phase filter is used for converting the differential signal into an orthogonal signal; the vector modulation module based on the Gilbert unit is used for carrying out polarity selection on the orthogonal signals and carrying out vector synthesis; the output transformer Balun is used for converting the output end differential signal into a single-end signal; the positive temperature coefficient current source is used for controlling the gain of the Gilbert unit. By designing the positive temperature coefficient current source changing along with the temperature, the change of the gain of the vector modulation module along with the temperature is slowed down, and the stability of the key performance of the active phase shifter within the temperature range of-55 DEG C to 85 DEG C is improved.

The invention discloses a multi-scale complex feature extraction method and system based on a lightweight two-step filter network. The method comprises the following steps: S1, constructing a filter training data set based on a digital elevation model and Gaussian noise; s2, constructing a multi-scale complex feature extraction network model of lightweight two-step filtering; s3, training a multi-scale complex feature extraction network model by using the filtering training data set; and S4, performing phase filtering processing on the terrain interferogram by using the trained multi-scale complex feature extraction network model to complete feature extraction. According to the method, lightweight U-Net and depth separable convolution are introduced, so that the parameter quantity and calculation complexity of the model are greatly reduced, and meanwhile, a two-step filtering mechanism based on complex conjugate operation is combined, so that refined extraction and optimization of complex features are realized; and through the residual attention module and the multi-scale feature fusion module, the cross-scale feature expression capability of the network is enhanced, and the robustness and anti-noise performance of the model are improved.

The invention belongs to the technical field of synthetic aperture radars, and particularly relates to a relative atmospheric wind speed measurement method based on time delay D-I nSAR. The method specifically comprises the steps of 1, obtaining differential interferograms of all distributed SAR satellites, and performing multi-view and phase filtering on the differential interferograms of all the satellites; 2, carrying out thresholding processing on the obtained image, converting the image into a binary image, and identifying water vapor group feature points; calculating an initial wind speed v0 by using the center displacement vectors of the feature points of the two adjacent images; and step 3, performing coordinate system conversion and coordinate axis length conversion on the obtained initial wind speed to obtain a two-dimensional relative wind speed of an atmospheric water vapor dense height layer of a plane parallel to the ground between two moments of satellite heavy orbit observation.

The invention provides a two-degree-of-freedom fundamental frequency modulation method and device of a multi-level current source converter. And triggering each bridge arm in the multi-level current source converter by adopting a fundamental frequency modulation mode according to a preset first degree of freedom and a preset second degree of freedom under the condition that the terminal voltage of the U-phase filter capacitor has a zero crossing point moment. On the basis of the first degree of freedom and the second degree of freedom, the switching speed of a semiconductor device on a bridge arm in the multi-level current source converter can be reduced by adopting a fundamental frequency modulation mode, and the harmonic quality of the multi-level current source converter is greatly improved, so that the operation loss of the multi-level current source converter is reduced, and the service life of the multi-level current source converter is prolonged. And the sampling cost and the control cost of the sensor are reduced. The multi-level current source converter can realize decoupling of voltage and power, so that the operation of the multi-level current source converter is more flexible and efficient.

The present application relates to the technical field of visible light communication, in particular to a FTN-mCAP interference mitigation method and system based on gap index modulation, comprising: using FTN-mCAP-GIM mapping at the transmitting end, using a gap index mechanism to activate k subbands in m subbands; the gap activation mechanism is that adjacent subbands cannot be activated at the same time; the m subband signals are up-sampled, the real part and the imaginary part of each subband signal after up-sampling are subtracted after passing through FTN in-phase filters and FTN quadrature filters respectively, and the target signal of each subband is obtained; the target signals of all subbands are combined to generate a transmitting signal. The present application can effectively avoid excessive overlap of different subbands in the frequency spectrum, reduce the inter-band interference generated at the transmitting end, achieve better bit error rate performance, and save bandwidth resources.

This invention relates to the field of power edge computing technology, specifically to a data filtering and transmission method and system based on an edge gateway. The method includes the following steps: generating an original power quantity sequence; constructing a dynamic phase filtering matrix; performing projection comparison on the mapping matrix to accurately separate and extract intrinsic feature components; calculating degradation trend values ​​and determining dynamic transmission priorities; and performing communication scheduling and distribution on the feature components, with high-priority components sent immediately and low-priority components merged after delay. In this invention, by performing multi-dimensional projection comparison on high-frequency sampling points, components reflecting the actual operating status of power distribution equipment are accurately extracted, false mutations are eliminated, and real faults are retained. Transmission priorities are calculated by combining channel congestion and degradation trend values. Status information is classified and graded for scheduling, transmission, and merging, completely eliminating the omission of critical early warning information, reducing the occupation of limited network bandwidth resources by redundant and invalid messages, and ensuring long-term stable operation of cross-level communication.

The invention discloses a TCN-based vehicle-mounted sound equipment equalizer compensation method and system, and relates to the technical field of vehicle-mounted electronic equipment, and the method comprises the steps: playing a test signal in a vehicle-mounted environment, collecting a distorted time domain waveform affected by an acoustic environment in a vehicle through a microphone, and carrying out the preprocessing of the distorted time domain waveform; inputting the processed waveform into a time convolution network, extracting multi-scale time sequence features, and predicting to obtain a first half segment coefficient of a linear phase FIR filter after global average pooling and full connection layer mapping; carrying out symmetrical overturning splicing on the front half segment coefficient, constructing a complete linear phase FIR filter coefficient, and carrying out direct current gain normalization processing; and finally, carrying out one-dimensional convolution operation on the normalized FIR filter coefficient and an original audio signal, and outputting an equalized audio signal subjected to frequency response compensation. According to the invention, the adaptive equalization compensation of the vehicle-mounted audio system is realized, and the tone quality performance and the hearing experience are remarkably improved while the linear phase characteristic is ensured.

The invention provides a digital channelization implementation method based on a fractional-multiple oversampling multiphase filter bank, the method works in a parallel pipeline mode, the number of input parallel paths is Ain, the number of output parallel paths is A, the number of channels is M, the length of each phase of sub-filter is L, the length of the total filter is L * M, and M = M1 * A, Aint; a, M1, Ain, A and L are all positive integers. The method comprises the following steps: shaping input Ain-path parallel data into A-path parallel data through a data shaping module; the input data is rearranged according to M phases through an input data rearrangement module, and A * L data are output in parallel under each clock; a sub-filter and a scheduling module of the sub-filter call a filter coefficient according to the parallelism A for filtering; channel frequency shifting is carried out through a parallel hierarchical FFT module; and finally, correcting phase deflection caused by oversampling through a phase rotation module to obtain a channelized result. According to the invention, large-bandwidth and multi-channel real-time digital channelization is realized based on the multi-phase filter bank in limited resources, the channel division is flexible, and the problem of frequency spectrum attenuation of a traditional multi-phase filtering channel is solved.

An electronic device testing method includes providing an electronic device including a sensor layer and a sensor driver, and testing the electronic device as the sensor driver transmits a test signal to the sensor layer. The sensor layer includes a plurality of first electrodes and a plurality of second electrodes. The sensor driver includes an in-phase filter and a quadrature phase filter. The testing of the electronic device includes testing the sensor driver. The testing of the sensor driver includes transmitting the test signal to the plurality of first electrodes and receiving a sensing signal through the plurality of second electrodes, outputting a first test value, outputting a second test value, and comparing the first test value and the second test value.

A quantitative phase contrast imaging system comprises a light source configured to generate light and to direct the light to a sample, wherein the light comprises nonlinearly polarized light; a first lens configured to receive light from the sample; a phase filter, wherein the first lens is configured to focus the light from the sample onto the phase filter, and the phase filter is configured to modulate multiple components of the nonlinearly polarized light simultaneously (e.g., geometric phase interferometry); a second lens configured to receive light from the phase filter; and a polarized camera, wherein the second lens is configured to collimate the light beam from the phase filter to the polarized camera and the polarized camera is configured to image the sample in response to the light from the phase filter. In absence of the second lens, the camera can be placed at the image plane.

The utility model relates to the technical field of filters, in particular to a phase filter. Comprising a case, a shock absorber is arranged on the case, a liquid cooling plate is arranged in the case, a cooling passage is arranged at the bottom of the liquid cooling plate, a cooling liquid inlet and a cooling liquid outlet are arranged outside the case, and the cooling liquid inlet and the cooling liquid outlet are oppositely arranged and both communicated with the cooling passage; a first filter path and a second filter path are further arranged in the machine box, the first filter path and the second filter path are mutually independent, and the first filter path and the second filter path each comprise a temperature control circuit breaker. According to the phase filter, the inductance device is used for reducing capacitive hazards in a three-phase alternating current power grid, the temperature control circuit breaker is arranged to guarantee safe operation of the filter, and a liquid cooling heat dissipation mode is adopted to guarantee stable and continuous operation of the filter.

The utility model discloses a three-phase interlaced PFC control system which comprises a three-phase filter circuit, a three-phase rectifier circuit, a three-phase interlaced power factor correction circuit, a three-phase AC input current detection circuit and a microcontroller. The input end of the three-interlaced power factor correction circuit is connected with the output end of the three-phase rectification circuit, and the output end is connected with a load; the input end of the three-phase AC input current detection circuit is connected with the three-phase power, and the output end of the three-phase AC input current detection circuit is connected with the microcontroller; the microcontroller collects an output end signal of the three-phase rectification circuit, an output end signal of the three-interlaced power factor correction circuit and an output end signal of the three-phase AC input current detection circuit, and drives the three-interlaced power factor correction circuit. According to the utility model, the problems of overhigh instantaneous voltage and current stress of a single-path PFC are solved, and the unbalance degree of three-phase current is obtained by adding the three-phase AC input current detection circuit, so that the driving mode of the three-path PFC unit circuit is adjusted, and the safety and stability of the system are ensured.

The utility model belongs to the technical field of mobile phase filtering devices, and particularly relates to a novel multifunctional mobile phase filtering device which comprises a mounting frame, a first supporting plate fixedly connected to the end of the mounting frame, a connecting pipe fixedly connected to the bottom of a tank body, and a fixing column fixedly connected to the inner side wall of a first mounting groove. A second mounting groove is formed in the bottom of the connecting pipe, a sealing ring is mounted in the second mounting groove, a filter pipe is movably connected to the interior of the second mounting groove, a limiting convex ring is arranged at the end of the filter pipe, a limiting ring is fixedly connected to the inner side wall of the connecting pipe, and a supporting ring is fixedly connected to the inner side wall of the filter pipe; the top of the supporting ring is movably connected with a filter membrane base, and the bottom of the limiting ring is attached to the top of the filter membrane base. According to the utility model, the limiting frame and the limiting convex ring are arranged, so that the filter pipe and the filter membrane are convenient to replace; and the intermittent rotating assembly is arranged, so that the device has multiple functions.

The application belongs to the technical field of radio frequency communication, and discloses a novel wideband linear phase filter and a design method thereof. The novel wideband linear phase filter comprises a first port, a second port, and three first transmission lines connected in series between the first port and the second port. Four connection points are formed between the first port and the adjacent first transmission line, between the three first transmission lines, and between the second port and the adjacent first transmission line. Four short-circuit branch lines are connected at the four connection points one by one. An inductance circuit module is connected at one end of the connection point between the first port and the adjacent first transmission line, and connected at the other end of the connection point between the second port and the adjacent first transmission line.

The invention belongs to the technical field of signal processing, and particularly relates to an FPGA (Field Programmable Gate Array)-based multiphase filter optimization method, which comprises the following steps of: setting a corresponding multiphase filter according to a bandwidth requirement, and exporting a filter coefficient of the multiphase filter; wherein the order N of the multi-phase filter is an integral multiple of the decimation rate M; carrying out filtering calculation in the multi-phase filter by adopting a filtering coefficient group rotation mode; and when a to-be-filtered signal in a clock period arrives, completing a group of N / M-order filtering on the to-be-filtered signal based on a convolution mode of two matrix rows until M groups are completed, and accumulating and outputting obtained results to obtain filtered data. The multi-phase filter with the corresponding bandwidth is designed in the FPGA according to requirements, real-time signal output is achieved by optimizing the multi-phase filter structure, and meanwhile the multiplier resource overhead of the FPGA is greatly saved.

The utility model belongs to the technical field of power equipment, and provides a frequency converter which comprises a frequency converter unit mechanism, a passive low-harmonic filtering mechanism and a sine filtering mechanism, the frequency converter unit mechanism comprises a frequency converter machine core, and the frequency converter machine core is connected with a direct-current reactor. The direct-current reactor is used for reducing main loop harmonic waves on the frequency converter machine core; the passive low-harmonic filtering mechanism comprises a three-phase input reactor and a three-phase filter reactor, the three-phase input reactor is electrically connected with external equipment, the three-phase filter reactor and the frequency converter machine core, and the three-phase filter reactor is used for reducing harmonic waves on an input line of the frequency converter; the sine wave filtering mechanism comprises a sine wave filter reactor used for reducing harmonic waves on an output line of the frequency converter, and the sine wave filter reactor is electrically connected with the frequency converter machine core and external equipment. Under the condition that the original specification is not changed, the technical problem that the harmonic wave of the frequency converter is too large is solved.

The invention discloses a sampling rate conversion device and method and an audio playing system, in the sampling rate conversion device, a control unit determines a target filter order and a target step value based on an input sampling rate and an output sampling rate; a filter coefficient generation unit determines a target filter coefficient and a historical filter coefficient based on a multi-phase filter basic coefficient table according to sampling point address information of a target input sampling point, a target filter order and a target step value; and the multi-phase filter convolution unit performs convolution operation on the target input sample point, the target filter coefficient, the historical sample point and the historical filter coefficient based on the target filter order to obtain a target output sample point. As the order of the target filter is dynamically generated according to the input sampling rate and the output sampling rate, the filtering coefficients can be determined based on the same polyphase filter basic coefficient table for different sampling rate conversion specifications, the storage space is saved, repeated switching of the coefficient table is not needed, the conversion steps are simplified, and the conversion efficiency is improved.

The invention discloses an InSAR (Interferometric Synthetic Aperture Radar) phase filtering method, device and system and a storage medium. The InSAR phase filtering method comprises the following steps: S1, acquiring an InSAR simulated data set; s2, according to the data set simulated by the InSAR, constructing a multi-scale convolutional neural network model based on physical constraints; and S3, inputting real SAR data into the multi-scale convolutional neural network model to carry out InSAR phase filtering. By adopting the technical scheme of the invention, effective noise suppression, detail maintenance and result stability are realized.

The invention relates to the technical field of signal and information processing, and particularly discloses a gear vibration signal decomposition method based on improved group sparse mode decomposition, which comprises the following steps: S1, measuring a gearbox to obtain gear vibration data; s2, using discrete Fourier transform to obtain a vibration signal frequency spectrum; s3, performing group sparse optimization on the frequency spectrum, and constructing a zero-phase filter group; s4, decomposing signal frequency spectrum filtering by using a zero-phase filter bank, and performing inverse Fourier transform to obtain a modal component; s5, calculating the periodicity of all groups of sparse mode components; s6, fusing the group sparse mode components with relatively high period similarity into an intrinsic mode component; and S7, selecting a fault component, extracting a fault characteristic frequency, and carrying out fault diagnosis. According to the method, the problem that the integrity of the gear fault feature information is damaged due to an over-decomposition phenomenon generated based on group sparse mode decomposition in the prior art is solved, the gear fault feature information can be protected, and the vibration feature of the gear signal is effectively extracted.