181 results about "Multiple frequency" patented technology

This invention discloses a signal transmission path optimization method for an integrated RF terminal chip, relating to the field of RF technology. The invention includes: S100 real-time parameter acquisition, calculation of mismatch loss factor, impedance deviation factor, and interference rise factor; S200 weighted fusion of the three factors to obtain a disabling coefficient, constructing a disabling coefficient curve, performing curve feature analysis to generate a reconstruction index, and comparing it with a threshold to determine whether reconstruction is necessary; S300 when reconstruction is required, querying the target control word of the matching network and filter based on a multi-dimensional lookup table, and performing priority correction based on interference and power occupancy; S400 executing control word writing, verifying the effect, and if it does not meet the standard, performing local search and fine-tuning until performance is restored. This invention achieves adaptive optimization of signal transmission paths in multiple frequency bands and scenarios through a closed-loop dynamic reconstruction process of perception, decision-making, execution, and verification, effectively reducing mismatch loss and interference impact, and improving the overall performance of the RF terminal chip.

A multi-band antenna includes a coaxial cable and two printed circuit boards. The first printed circuit board includes two radiators. The first radiator is located on a first side of the first printed circuit board. The second radiator is located on a second side of the first printed circuit board. The second printed circuit board includes a feed section and multiple frequency adjustment sections. The feed section is located on a third side of the second printed circuit board and coupled to the second radiator. The multiple frequency adjustment sections are located on a fourth side of the second printed circuit board. The first, second, third, and fourth sides are connected by multiple vias. The first radiator, second radiator, and frequency adjustment sections respectively emit a first frequency band, a second frequency band, a third frequency band, and a fourth frequency band. The frequencies are arranged in ascending order as the first, second, third, and fourth frequency bands. This invention provides an antenna structure for a multi-band antenna that can simultaneously radiate multiple frequency bands and possesses excellent antenna radiation characteristics.

The utility model discloses an electromagnetic damping vibration isolation device belongs to vibration control technical field. The utility model solves the technical problem of the magnetic field intensity fixed of electromagnetic damping vibration isolation device and coil heating easily leads to performance attenuation. The utility model discloses an electromagnetic damping vibration isolation device, including coil subassembly and conductor block. Coil subassembly includes coil and coil clamp. Coil clamp is held in the outer periphery of coil. Coil clamp includes clamp body and water cooling pipeline. The heat dissipation block is equipped on the clamp body, and the heat dissipation block extends along the radial direction of coil, and multiple heat dissipation blocks are evenly arranged around coil. The water cooling pipeline is surrounded in the clamp body. The conductor block is located between at least two groups of coil subassembly, and the magnetic pole of every two groups of coil subassembly is opposite, thereby making the conductor block can be subjected to electromagnetic damping force when producing vibration. The utility model discloses a vibration isolation device can cover the vibration control demand of multiple frequency bands, avoids coil overheat aging, improves the life of vibration isolation device.

The application discloses a kind of transformer intelligent enclosed neutral point protection devices, including maintenance switch, lightning arrester, capacitive voltage divider, filter module, isolation transformer, charge-discharge module, voltage detection module, gap discharge unit, digital control unit;Filter module is used to filter the voltage signal of capacitive voltage divider after voltage division flows into isolation transformer, removes high-frequency signal, retains power frequency or its multiple frequency signal, realizes the distinction of transient overvoltage signal and steady overvoltage signal;Voltage detection module is used to detect the voltage amplitude of four capacitors in charge-discharge module, duration, and real-time transmission detection data to digital control unit, and digital control unit real-time uploads detection data to main control background, control pulse trigger controllable switch opens or closes, control discharge of enclosed discharge gap.The application realizes the accurate identification of transformer neutral point overvoltage type, solves the problem of high misoperation rate of existing device, damage transformer.

This allows for the assurance of good call quality across multiple frequency bands without the need for tuning for each individual frequency band. [Solution] This is an acoustic signal processing device that transmits a signal in a predetermined frequency band, the receiving frequency band, acquired via a communication device that performs voice communication, to a sound generating unit via a receiving-side signal path to produce sound from the sound generating unit, and acquires voice input via a sound detection sensor via a transmitting-side signal path and outputs it to the communication device. It comprises a band detection unit that detects whether the receiving frequency band is a narrowband first frequency band or a second frequency band wider than the first frequency band, based on a reference signal transmitted through the receiving-side signal path, and a band-specific countermeasure unit that takes countermeasures according to the frequency band detected by the band detection unit.

This application discloses a wind tunnel-based noise detection method, apparatus, storage medium, and electronic device. The method includes: when testing a test piece in a wind tunnel, acquiring a measured noise spectrum in the testing environment and obtaining the operating frequency of the wind tunnel's inverter; matching the background noise spectrum corresponding to the operating frequency in a background noise spectrum library based on the operating frequency; aligning and dividing the measured noise spectrum and the background noise spectrum using a frequency band division rule adapted to the inverter's operating frequency to obtain multiple frequency band units; based on the acoustic energy density of the measured noise spectrum and the background noise spectrum within each frequency band unit, extracting the energy component corresponding to the background noise spectrum from the measured noise spectrum through directional orthogonal projection, and reconstructing the spectrum of the residual energy after extraction to obtain the effective aerodynamic noise spectrum of the test piece; and calculating the noise detection result of the test piece based on the effective aerodynamic noise spectrum.

This invention discloses a method for quantifying the wear depth of finger sleeves used in nuclear power plant neutron flux measurement. The method includes the following steps: a. Measuring the actual dimensions of the finger sleeves in a nuclear power plant, establishing simulation models and performing simulation calculations for finger sleeves with annular and wedge-shaped defects; b. Establishing a unified calibration process, calibrating the simulation signals, and using the model to calculate signals at multiple frequencies for different finger sleeve defects; c. Performing frequency mixing calculations on the multi-frequency simulation signals to eliminate signals from the external sleeve structure; d. Drawing a graph showing the relationship between defect depth and circumferential angle and the amplitude and phase of the simulation signal, based on the specific parameters of the defect; e. Importing the measured signal values ​​into the drawn image, and quantizing the signal to defect parameters based on coordinates and legend information. This patent effectively reduces the quantization error of finger sleeve wear depth in Bobbin probe eddy current signals, improves the reliability of quantization, and can also quantify the wear angle of unilateral wedge-shaped wear.

This utility model discloses an LTE antenna, relating to the field of antenna technology. It includes a circuit board (FPC); a radiating circuit formed on the front side of the circuit board through an etching process, comprising multiple frequency band resonant structures, including the LTE frequency band; a groove, the front portion of the circuit board excluding the frequency band resonant structures; a feed point, located on one end surface of the groove; a gap, located at the end of the circuit board near the feed point and extending to the middle of the circuit board; and an adhesive layer, located on the back side of the circuit board and covering the back side. The antenna is directly attached using the adhesive layer, eliminating the need for a traditional antenna bracket. Furthermore, the radiator's placement on the circuit board enhances the antenna's radiation directionality and improves radiation performance. The FPC substrate is ultra-thin and flexible, adapting to curved surfaces and significantly improving antenna integration efficiency and reliability. It is suitable for space-constrained scenarios such as IoT terminals and automotive devices.

A communication device determines that simultaneous transmission and reception across multiple frequency bands is not permitted in a WLAN. The communication device transmits a first packet in a first frequency band starting from a first time, and transmits a second packet in a second frequency band starting from a second time different from the first time. The transmission of the second packet overlaps with the transmission of the first packet in time. In response to the determination that simultaneous transmission and reception across multiple frequency bands is not permitted, the communication device includes padding in the first packet such that the end of transmission of the first packet and the end of transmission of the second packet occur simultaneously.

This invention relates to the field of acoustic emission signal feature enhancement for aero-engines, and discloses a method, system, medium, and device for denoising weak fault signals under strong background noise in aero-engines. The method includes: acquiring strong background noise signals under normal operating conditions of the aero-engine; performing wavelet packet decomposition and reconstruction to obtain multiple frequency band component signals; constructing a corresponding autoencoder for each frequency band component signal, and using the frequency band component signal as input to perform unsupervised training on the autoencoder; performing wavelet packet decomposition and reconstruction on the acoustic emission signal to be processed to obtain multiple frequency band component signals to be processed; inputting each frequency band component signal to be processed into the corresponding trained autoencoder for reconstruction; calculating the reconstruction error between the input and output signals of each autoencoder; determining whether each frequency band component signal contains outliers based on the reconstruction error; reconstructing the frequency band component signals containing outliers to obtain the denoised fault signal.

The application belongs to the technical field of equipment element combination optimization and intelligent matching, and discloses a waveform feature clustering guided arrayed electronic equipment element combination optimization method and device. The method is a collaborative optimization mechanism with waveform feature clustering as the core, which is proposed for arrayed electronic assembly under the condition of multiple product parallel assembly and complex working conditions of multiple temperatures and multiple frequency points. In the initial stage of population initialization, the performance response characteristics of signal channels under complex working conditions are analyzed, and clustering analysis is performed to identify channel main clustering clusters with consistency potential, and the initial population is generated based on the channel main clustering clusters to lay the foundation for structural consistency. In the evolution process, a cross mechanism based on clustering structure reservation is designed to lock and inherit the high-quality channel combination structure and strengthen the genetic transmission of good genes. In combination with suspicious channel identification and directional disturbance means, the key influence channel is precisely fine-tuned. The application can significantly improve the waveform consistency and assembly efficiency of the multi-channel equipment.

A multiband antenna has an array face with closely spaced dipoles of multiple frequency bands in the low band, the mid band, and C-band or CBRS (Citizens Broadband Radio Service). The low band dipole has four dipole arms formed in a plurality of loops from a single piece of metal. In one embodiment, the loops successively decrease in dimension, resulting in a tapered dipole arm shape and has a bend that bends the dipole arms downward to accommodate radome curvature. In a second embodiment, the outermost loop of each dipole arm is larger in volume and has its lateral loop features bent downward.

This invention relates to the technical field of paper bag production, specifically to a machine learning-based method for paper bag gluing positioning and adhesion control, comprising the following steps: S1, generating original grayscale data; S2, generating the maximum structural response amplitude at multiple frequency levels and the local phase information of each pixel; S3, generating a high signal-to-noise ratio structural amplitude map; S4, generating a structural feature map; S5, generating glue path segmentation results; S6, generating control commands based on the deviation vector; by calculating the multi-frequency structural synchronization index through frequency domain phase analysis, systematic positioning deviations caused by anisotropic interference are eliminated; a texture-independent structural feature map is generated, so that the geometric segmentation network does not need to be retrained when changing paper batches, completely solving the domain drift problem; combined with fast adaptive direction decomposition and lightweight network design, the real-time closed-loop control requirements of high-speed production lines are met, significantly improving gluing accuracy and production line adaptability.

A kind of well temperature field reconstruction and thermal disaster early warning method and system based on acoustic tomography, method: staggeredly arranging explosion-proof loudspeaker array and microphone array on the two sides of roadway in monitoring area;Utilize frequency division multiplexing technology to emit / receive multiple frequency band acoustic waves synchronously, form entity acoustic path data set, and construct overdetermined equation group;Adopt virtual sound line method, realize virtual path enhancement;Realize high-resolution temperature field reconstruction of roadway cross section temperature field in combination with sound velocity-temperature linear model;Continuous multiple frame temperature field images are input into TimesNet model, and multi-scale features are extracted by adaptive period decomposition and two-dimensional space-time convolution, and fire warning grade and abnormal area coordinates are output.The system: including explosion-proof loudspeaker array, microphone array, edge computing node and host computer;Edge computing node is connected with explosion-proof loudspeaker array and host computer respectively.The present application can realize global temperature perception and concealed fire early warning in target monitoring area.

The application provides a large model training acceleration method and system based on CUDA shared memory and a PCIe expansion card, hardware configuration information is acquired to identify the PCIe expansion card and build an expansion storage space, and a unified management heterogeneous memory space is formed in combination with GPU shared memory; in the training process, according to a preset initialization strategy, model data blocks are loaded to different levels of the heterogeneous memory, data access frequency is monitored in real time, data migration instructions are dynamically generated based on multiple frequency thresholds, and intelligent scheduling of the data blocks among the levels of storage is realized; a transparent address remapping mechanism is used to enable CUDA kernel functions to seamlessly access the heterogeneous memory space; periodic data snapshots and persistent storage are simultaneously supported, and quick recovery after interruption of training is ensured; the application breaks through the GPU display memory capacity limit, improves the large model training efficiency, reduces the dependence on multi-card hardware and cost, and guarantees data security and training reliability.

The utility model relates to the technical field of sound production instruments, and provides a patch type buzzer, which adopts a double-layer circuit board structure, a second circuit board is provided with a conversion element, and the conversion element and an electric appliance element on the second circuit board form a direct current-alternating current conversion circuit for converting direct current into alternating current. When the second circuit board and the first power connection board are stacked up and down, the conversion element is limited on the conversion element receding groove, so that the second circuit board abuts against the first power connection board, and when the buzzer adopts single-frequency sound production, the size of the buzzer can be designed to be smaller, and the buzzer can be more compact. When the volume of the buzzer is the same as that of a buzzer in the prior art, the internal space of the buzzer is relatively increased due to the fact that the second circuit board abuts against the first power connection board, and multi-frequency sound can be made.

The application provides a method and device for evaluating the harmonic interference degree of a converter transformer by using a vibration signal. The method comprises the following steps: collecting multiple vibration signals collected by multiple vibration sensors as vibration samples; obtaining the frequency spectrum of each vibration sample; constructing a discrete frequency spectrum sequence of the vibration sample by using the amplitude of a preset reference frequency and its multiple frequencies in the frequency spectrum of the vibration sample; identifying the effective local peak value of the discrete frequency spectrum sequence of each vibration sample; calculating the energy concentration degree feature and the energy distribution entropy feature of the vibration sample based on the effective local peak value; and finally evaluating the harmonic interference degree of the converter transformer at the current moment according to the energy concentration degree feature and the energy distribution entropy feature of each vibration sample. The scheme evaluates the harmonic interference degree of the converter transformer by using the vibration signal, thereby preventing the converter transformer from malfunctioning due to excessive harmonic interference.

The application discloses a residual stress detection method based on chirp electromagnetic surface acoustic wave. Although the existing variable interval coil structure can expand the working frequency band of the sensor, the excitation ability of the low frequency component is limited, and it is difficult to meet the stress detection requirements of large thickness components. The electromagnetic acoustic sensor structure is designed, the width of the coil is continuously changed along the ultrasonic surface wave propagation direction, the wide frequency excitation of the chirp surface wave signal is realized, especially the excitation and propagation effect of the low frequency component is enhanced, so that the signal-to-noise ratio and detection accuracy after the signal matched filtering are significantly improved. The sensor utilizes the characteristics that the penetration depth of the ultrasonic surface wave changes with the frequency, realizes the layered detection of the multi-level residual stress in the material through the chirp signal, can cover multiple frequency ranges to adapt to components with different thicknesses, thereby avoiding the problem that the traditional fixed frequency or variable interval sensor needs to be frequently replaced. The method has high detection accuracy, wide detection range and high detection efficiency, and is suitable for nondestructive residual stress evaluation of metal components and engineering structure health monitoring.

This specification provides a terminal access method, device, electronic device, and medium, applicable to various IP network environments and multiple network topologies. It can be used in traditional copper cable access and wireless access scenarios, as well as fiber optic access scenarios, including FTTR (Fiber to the Room) all-optical access networks. The method includes: with the encryption method configured as a first preset encryption method, for a target frequency band among multiple frequency bands, deleting multi-link operation information from the Wi-Fi 7 management frame corresponding to the target frequency band to obtain a target management frame; transmitting the target management frame on the target frequency band; receiving a single-link connection request sent by the terminal; and establishing a single-link connection with the terminal based on the single-link connection request, thereby enabling the terminal to access the AP.

A wireless transmit / receive unit (WTRU) can receive configuration information. The configuration information can indicate a configured bandwidth for performing positioning reference signal (PRS) measurements. The WTRU can receive a first PRS transmission using a first portion of the configured bandwidth. The first portion of the configured bandwidth can correspond to a first frequency hop associated with the configured bandwidth. The WTRU can receive a second PRS transmission using a second portion of the configured bandwidth. The second portion of the configured bandwidth can correspond to a second frequency hop of the configured bandwidth. The WTRU can determine a PRS measurement based on the first PRS transmission and / or the second PRS transmission. The WTRU can transmit the PRS measurement and an indication of whether the measurement is based on multiple frequency hops.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for a radio frequency (RF) receiver including a dual-mode low noise amplifier (LNA). One of the methods includes configuring the RF receiver to a wideband mode including operation over a multiple receive frequency (RX) bands including multiple frequencies, receiving, by the RF receiver, an input RF signal, scanning the multiple frequencies to detect a transmitted frequency of the input RF signal, configuring the RF receiver to narrowband mode including operation over a proper subset of the RX bands including a proper subset of the multiple frequencies, and tuning the RF receiver to the transmitted frequency.

The application relates to a remote control signal copying method, a remote control copier and a storage medium, and the method comprises the following steps: receiving a remote control signal of a remote control device to be copied; switching different local oscillator clock frequency values, for each local oscillator clock frequency value, performing mixing processing on the received remote control signal and each local oscillator clock frequency value to obtain an intermediate frequency signal; when the intermediate frequency signal is a continuous and stable square wave signal, obtaining a corresponding target local oscillator clock frequency value and multiple frequency values of the intermediate frequency signal; determining a working mode of the remote control signal according to the multiple frequency values of the intermediate frequency signal; processing the multiple frequency values of the intermediate frequency signal and the target local oscillator clock frequency value by using a frequency determination rule in the working mode to determine a transmission frequency value of the remote control signal; and based on a decoding rule corresponding to the working mode, analyzing the remote control signal by using the transmission frequency value to copy a remote control instruction corresponding to the remote control signal. The method can still realize remote control function under the condition of a long distance.

This invention discloses a high-frequency piezoelectric signal denoising method based on WPD-AT-EMD, belonging to the field of signal processing technology. The method involves wavelet packet decomposition of the original noisy signal to obtain sub-signals in multiple frequency bands. For each high-frequency sub-signal, a threshold is calculated according to a locally dynamically adjusted adaptive threshold rule, and an improved threshold function is used for threshold processing. Then, all processed sub-signals are reconstructed to obtain a preliminary purified signal. The preliminary purified signal is then subjected to EMD decomposition to obtain several Intrinsic Mode Function (IMF) components. This invention employs a collaborative denoising mechanism combining wavelet packet decomposition, adaptive threshold processing, and empirical mode decomposition, which can accurately suppress high-frequency noise in strongly interfering and non-stationary high-frequency piezoelectric signals while completely preserving signal impulse characteristics and key waveform information. It effectively improves the signal distortion and feature loss problems that easily occur in traditional denoising methods and significantly alleviates the EMD mode aliasing phenomenon.

This invention provides an audio adjustment circuit and method. The audio adjustment circuit includes: a signal generation circuit for processing a serial control signal to generate multiple frequency selection control signals; an operational amplifier with its non-inverting input connected to a reference potential, its inverting input forming a summing node, and its output serving as the output of the audio adjustment circuit; a feedback circuit disposed between the output of the operational amplifier and the summing node; a frequency selection network disposed between the input and the summing node; and an analog switching network controlled by the multiple frequency selection control signals for switching between multiple candidate connection states to selectively connect different nodes in the frequency selection network to the summing node and / or change the connection relationships between branches in the frequency selection network, thereby forming different pre-equalized frequency responses at the output. Using the above technical solution, the gain or attenuation of the high-frequency portion of the audio input signal can be dynamically adjusted to improve sound quality.

This application provides a method and apparatus for analyzing the active power response characteristics of power electronic equipment. The method includes: acquiring the frequency domain curve of a target power electronic equipment, wherein the target power electronic equipment is a power electronic equipment connected to the power grid, and the frequency domain curve is an amplitude-frequency characteristic curve showing the ratio between the amplitude of the phase element of the modulated voltage superimposed with the amplitude of the response active power as a function of frequency; and completing the active power response characteristic analysis of the target power electronic equipment based on the slope and amplitude of the frequency domain curve in multiple frequency bands. This application can realize the active power response characteristic analysis of power electronic equipment during actual operation, improving the reliability of the active power response characteristic analysis.

This invention discloses an electromagnetic coil winding detection system and method, belonging to the field of electromagnetic coil winding technology. It solves the problem in segmented electromagnetic coil windings of high-voltage high-frequency transformers where distributed parameter resonance and high-frequency harmonic coupling generate dynamic interlayer overvoltages, continuously inducing partial discharges, ultimately leading to winding breakdown and short circuits, and the cause of failure is difficult to trace. The system includes a data acquisition module, a data preprocessing module, a resonance feature extraction module, a parameter calculation module, a risk index calculation module, a product-level judgment module, and a batch statistical process control module. This invention collects impedance data of the electromagnetic coil at multiple frequency points and preprocesses it to extract resonance feature parameters. It then calculates the resonance amplification factor and harmonic excitation intensity by combining operating parameters, and further integrates the quality factor and frequency matching degree to generate a comprehensive risk index. Based on this index, the coil is graded, and batch data is statistically controlled to issue process warnings.

The invention relates to a shallow sea equivalent earth sound model inversion method based on sparse Bayesian learning dispersion curve estimation, and the method comprises the following steps: 1, carrying out the time-frequency transformation of broadband sound source data received by a shallow sea vertical array, and obtaining multi-frequency-point and multi-snapshot frequency domain vertical array data; step 2, constructing a horizontal wavenumber hypothesis interval and a modulus depth function hypothesis space corresponding to each frequency point according to a water layer sound velocity profile and environmental prior information; and step 3, based on a normal mode sound propagation theory, frequency domain vertical array data of each frequency point is modeled as a weighted sum of each mode depth function in the mode depth function hypothesis space, and a weight vector is a horizontal wave number spectrum. According to the method, the sound field intrinsic characteristic, namely the dispersion curve, irrelevant to the sound source is directly extracted from the vertical array data, and an equivalent earth sound model concept is utilized, so that an earth sound parameter inversion scheme which is more stable, is more tolerant to model mismatch and can effectively avoid attenuation coefficient coupling influence is realized.

This invention relates to the field of fiber optic vibration analysis technology, and particularly to a method, apparatus, electronic device, and storage medium for locating fiber optic vibration sources. The method first acquires a first waveform data queue; then, it segments the first waveform data queue and extracts the frequency domain amplitude of multiple waveform segments based on each subcarrier frequency to obtain a frequency domain amplitude vector; next, it binarizes and concatenates the multiple frequency domain amplitude vectors to obtain the waveform time; finally, it determines the transmission time of the first waveform's starting end based on the initial phase, truncation length, and waveform time, and determines the vibration source location based on the reception time and transmission time of the first waveform's starting end. This invention determines the optical signal transmission time by demodulating and modulating the laser optical signal and compensating for the demodulated duration. Compared to current methods that rely on backscattered Rayleigh laser pulse feature analysis, this method offers higher accuracy and better vibration source location.