126 results about "Spectrum shaping" patented technology

The invention discloses a frequency domain ground penetrating radar transmitting source coding and receiving signal synthesis method and system. The method comprises the following steps: constructing a frequency domain coding continuous wave ground penetrating radar transmitting signal by extracting amplitude and phase information of multiple frequency points of a time domain ultra-wideband transmitting pulse; adopting a fast forward modeling method based on impulse response to realize forward modeling of a coding source emission signal of the typical geoelectric model; in-phase components and orthogonal components of all frequency points are extracted, frequency responses are synthesized into responses of quasi-time-domain transmitted pulses through an inverse Fourier transform method, the high resolution equal to that of time-domain ultra-wideband transmitted signals is obtained, and higher anti-noise performance is achieved. According to the invention, the amplitude phase coding continuous wave transmitting signal is adopted, so that the frequency spectrum shaping of the quasi-time domain pulse of the transmitting frequency spectrum is realized, the resolving power of the synthetic signal is improved, and a theoretical basis is laid for signal synthesis of frequency domain ground penetrating radar hardware design.

The invention provides a signal modulation method and a related device, and the method comprises the steps: obtaining a first symbol sequence, carrying out the single-carrier modulation of the first symbol sequence, enabling the phase difference between two adjacent symbols in the first symbol sequence to be 90 degrees, enabling the single-carrier modulation to comprise the frequency spectrum adjustment based on a first scaling factor and the frequency domain spectrum shaping FDSS, the spectrum adjustment comprises spectrum compression; and determining a signal generated after the first symbol sequence is subjected to single-carrier modulation. According to the method, the first symbol sequence with the phase difference of 90 degrees between two adjacent symbols is subjected to single-carrier modulation, a single-carrier modulation scheme for performing frequency spectrum compression in a frequency domain is provided, the frequency spectrum efficiency is improved, and a single-carrier signal with low PAPR is generated.

The invention relates to the technical field of communication, and discloses an AI-based adaptive data encryption method and system, and the method comprises the steps: carrying out the frequency domain transformation analysis of an original data flow, and generating a spectrum distribution feature set; the carrier frequencies are screened through a dynamic frequency selection algorithm to obtain an optimal carrier frequency range; performing phase modulation on the data bit stream, and embedding the data bit stream into a subcarrier in an optimal carrier frequency range to generate a first encrypted data stream; when the interference intensity exceeds an interference threshold value, performing directional adjustment on a frequency deviation parameter according to an interference type, and generating a second encrypted data stream; dynamically adjusting the frequency distribution parameters according to the transmission distance data to obtain a frequency distribution parameter set; and performing adaptive modulation and spectrum shaping on the second encrypted data stream based on the frequency distribution parameter set, and outputting a hidden transmission data stream. The method has the following effect that the data hidden transmission capability and the receiving and restoring accuracy in a complex environment can be improved.

The invention provides an electronic component test system, method and device and a medium, and the method comprises the steps: applying a pulse excitation signal to an input end of a to-be-tested electronic component, and determining an equivalent parasitic parameter set of the to-be-tested electronic component; constructing a signal path simulation network when the to-be-tested electronic component is tested based on the equivalent parasitic parameter set in combination with a test path of the to-be-tested electronic component, and performing test response analysis on the initial test signal through the signal path simulation network to obtain a signal pre-compensation coefficient of the initial test signal in a transmission process; applying a spectrum shaping test signal determined based on the signal pre-compensation coefficient to the to-be-tested electronic component, and determining the waveform fidelity of the actual response and the expected response of the spectrum shaping test signal under the to-be-tested electronic component; and whether the to-be-tested electronic component passes the test is determined based on the waveform fidelity. According to the technical scheme provided by the invention, the to-be-tested electronic component can be effectively tested when the test signal generates distortion deviation.

Aspects of the subject disclosure may include, for example, determining a channel condition of a communication channel and identifying a bandwidth-related power constraint imposed upon the communication channel. A spectrum encoding strategy is determined based on the channel condition and the bandwidth-related power constraint, wherein application of the spectrum encoding strategy facilitates compliance with the bandwidth-related power constraint. The spectrum encoding strategy may be provided to a receiver to facilitate reliable communication of digital information over the communication channel according to the bandwidth-related power constraint. Other embodiments are disclosed.

The invention provides a communication method and device. The method comprises the following steps: determining a first frequency domain resource position of a primary synchronization signal PSS, a second frequency domain resource position of a secondary synchronization signal SSS, and a third frequency domain resource position of a physical broadcast channel PBCH signal; performing single-carrier modulation on a symbol borne by the PBCH based on the third frequency domain resource position to obtain a PBCH signal, wherein the single-carrier modulation comprises performing the same frequency domain spectrum shaping (FDSS) processing on a common part of the first frequency domain resource position of the PSS, the second frequency domain resource position of the SSS and the third frequency domain resource position of the PBCH signal; according to the method and the device, the synchronization signal block SSB with a relatively low peak to average power ratio (PAPR) can be obtained, and the SSB comprises the PBCH signal modulated by adopting a single carrier, so that the transmitting power of the SSB is improved, and the coverage range of a cell is improved.

The invention relates to the technical field of non-contact physiological signals, and discloses a remote physiological signal detection method based on an adaptive filter, a terminal and a medium. The method comprises the following steps: obtaining a to-be-detected face video, and obtaining a noise rPPG signal through noise processing; performing feature extraction on the face video to obtain a multi-scale space-time diagram; fusing the noise rPPG signal and the multi-scale space-time diagram to obtain fused data; performing denoising processing on the fused data by using a denoising module to obtain denoised data; the de-noising module adopts an adaptive filter de-noising module, the interior of the de-noising module is composed of multiple layers of filter structures, and each layer of filter structure comprises a fixed spectrum shaping filter, a scene adaptive shaping filter and a spectrum period feature extraction filter which are connected in sequence; and outputting a predicted rPPG signal according to the denoised data. According to the method, deep fusion and denoising are carried out on the noise and the multi-scale spatial-temporal characteristic data by using the adaptive filter, and high-precision rPPG signal estimation is realized.

Provided is an image sensor including a sensor substrate including a first photosensitive cell and a second photosensitive cell which are configured to sense light incident on the sensor substrate, a color separating lens array configured to change a phase of first wavelength light and a phase of second wavelength light such that the first wavelength light travels to the first photosensitive cell and the second wavelength light travels to the second photosensitive cell, and a spectrum shaping layer including a plurality of nanostructures respectively having a first refractive index, and a dielectric material provided between the plurality of nanostructures and having a second refractive index, the spectrum shaping layer being provided between the sensor substrate and the color separating lens array and configured to shape a spectral profile of the light incident on the sensor substrate by reflecting and / or absorbing portion of light passing through the color separating lens array.

The invention discloses a radar communication integrated waveform design method based on an OFDM (Orthogonal Frequency Division Multiplexing) signal. The method comprises the following steps that: a transmitting end completes constellation mapping on transmitted communication information, performs ZCT matrix reconstruction, performs serial-parallel conversion on reconstructed communication data, performs spectrum shaping on an integrated signal by adopting an improved Nyquist pulse, and transmits the integrated signal to a receiving end; and then IFFT processing, parallel-to-serial conversion, cyclic prefix addition, digital-to-analog conversion and up-conversion are carried out on the shaped data, and finally integrated waveform emission is completed. And the receiving end performs down-conversion, analog-to-digital conversion and cyclic prefix removal operation on the received signal. In the communication function, serial-to-parallel conversion, FFT processing, inverse pulse shaping, parallel-to-serial conversion, ZC matrix reconstruction solution and inverse mapping are carried out on the data without the cyclic prefix to obtain communication information. In the radar detection function, radar signal processing is performed on data without cyclic prefixes. According to the method, the correlation of OFDM integrated signals can be effectively optimized, the modulation characteristic of communication information is improved, the influence of the communication information on a fuzzy function is reduced, OFDM symbols have better correlation, meanwhile, the peak-to-average power ratio of the system is effectively reduced through pulse shaping, implementation is easy, and the comprehensive performance of the system can be remarkably improved.

The invention relates to the technical field of sequential control, and discloses a sequential logic control circuit for a noise shaping SAR ADC (Synthetic Aperture Radar Analog to Digital Converter), which comprises an analog signal acquisition circuit for receiving and preprocessing an initial input signal; the noise shaping circuit is used for performing frequency spectrum shaping on quantization noise in the analog signal and generating the analog signal subjected to noise shaping; the successive approximation type analog-to-digital converter is used for performing bit-by-bit comparison with the analog signal subjected to noise shaping and gradually completing conversion from the analog signal to the digital signal from the highest bit to the lowest bit; and the clock control circuit is used for coordinating sequential logic among the analog signal acquisition circuit, the noise shaping circuit and the successive approximation type analog-to-digital converter. According to the method, frequency spectrum remodeling is carried out on the quantization noise in the signal, the signal-to-noise ratio of the signal is remarkably improved on the premise that the hardware complexity is not additionally increased, and then interference of the noise on follow-up analog-to-digital conversion is reduced.

The embodiment of the invention provides a seismic acquisition data speed normalization method and system, and belongs to the technical field of seismic data processing. The method comprises the following steps: performing signal reduction normalization processing on acquired data, eliminating the influence of frequency spectrum shaping equipment, classifying according to the type of a detector, forming a corresponding seismic data set, eliminating the influence of gain, and converting the signal into a unified speed physical quantity; determining a deconvolution operator according to the detector frequency response and executing deconvolution processing; performing high-pass filtering and unified calibration on the processed data to obtain data with consistent dynamic response; and outputting a speed normalization result based on the data. According to the scheme, the problem of inconsistent response caused by the type difference of the detectors is effectively reduced, and the seismic data resolution and the signal-to-noise ratio under the combined acquisition condition of multiple types of detectors are improved.

The invention discloses an overseas warehouse storage and distribution path dynamic optimization system and method based on big data, and relates to the technical field of intelligent storage and distribution optimization, and the method comprises the steps: obtaining cargo physical parameters to calculate a batch resonance description amount; performing frequency domain transformation on the vertical acceleration of the path unit to obtain a normalized spectral form; calculating the energy overlapping degree of the two in the frequency domain to obtain a spectral resonance overlapping amplification index; and constructing a batch-related edge weight based on the index, solving an optimal path in the unified graph, and determining a final execution path. The method can effectively identify and avoid the path where the vibration energy is concentrated on the sensitive frequency band of the goods, and reduces the resonance damage risk while guaranteeing the operation efficiency.

The application discloses a method for improving two-dimensional resolution of GEO SAR based on space spectrum synthesis, constructs a space spectrum shape of the GEO SAR and an expression of a space spectrum offset of an image under different viewing angles in a vector form, replaces space spectrum domain movement with image domain de-skewing, and realizes improvement of two-dimensional resolution of the GEO SAR through space spectrum synthesis.

The invention discloses a transient absorption spectrum scanning data validity control and sample state determination method and system, and the method comprises the steps: obtaining a two-dimensional data matrix of multiple times of scanning, carrying out the time zero point alignment and intensity normalization preprocessing, extracting a spectrum vector at a key delay time point, and calculating the spectrum shape similarity to determine the spectrum shape consistency, and constructing a dynamic proportion parameter in a sentry band to judge dynamic trend consistency, and marking abnormal scanning and executing a processing strategy according to the results of the dynamic proportion parameter and the dynamic trend consistency. According to the invention, objective determination of validity of scanning data is realized, spectral distribution form and dynamic behavior change are described, real-time abnormity determination and control in an experiment process are supported, and reliability and repeatability of an experiment result are improved.

A signal transmission method and a communication device, a sending end device applies different sending end window functions to a plurality of symbols to be transmitted in a frequency domain spectrum shaping process. The sending end window functions corresponding to different symbols are related to the distance of a target to be perceived, so that within the distance range of the target to be perceived, the range ambiguity function of one or more symbols after applying the sending end window function has a notch or a sidelobe less than a threshold within the distance range. After the receiving end device receives the echo signal reflected by the target to be perceived, it can determine whether the target to be perceived exists according to whether the range image generated by one or more symbols has a peak or a sidelobe greater than a threshold within the distance range, thereby reducing the sidelobe level (peak) in the range image, effectively reducing the false alarm probability and the missed detection probability of the perceived target.

This disclosure provides a digital transmitter, relating to the field of transmitter technology. It includes: a baseband data generation unit for multi-phase output of baseband data; and a basic unit including an I-channel mixer and a Q-channel mixer. The I-channel mixer performs mixing processing on the multi-phase outputs of the positive-phase I-channel baseband data and the negative-phase I-channel baseband data, while the Q-channel mixer performs mixing processing on the multi-phase outputs of the positive-phase Q-channel baseband data and the negative-phase Q-channel baseband data. The positive-phase outputs of the I-channel and Q-channel mixers are respectively connected to the positive-phase RF input of the digital transmitter, and the negative-phase outputs of the I-channel and Q-channel mixers are respectively connected to the negative-phase RF input of the digital transmitter. This disclosure simplifies the circuit structure of traditional digital transmitters and enables effective bandwidth expansion. Furthermore, by introducing multi-tap filtering for the baseband data, better spectrum shaping can be achieved.

The application discloses a random load spectrum fatigue life correction method based on a spectrum shape factor and an improved nominal stress method, and comprises the following steps: fatigue test life of a first random load spectrum and a second random load spectrum is acquired; a function relationship between a calculation error and a load spectrum shape factor is established according to the fatigue test life of the first random load spectrum and the second random load spectrum; and fatigue life of a target random load spectrum is corrected according to the function relationship. By introducing the load spectrum shape factor to explicitly represent the spectrum shape difference, combining two sets of test data to construct an error correction function, the application can effectively improve the prediction accuracy of the random load spectrum fatigue life under different spectrum shapes, and has low test cost and strong engineering implementation.

The application discloses a reconfigurable microwave photonic filter, comprising a laser source, an electro-optic modulator, an adjustable feedback type array waveguide grating, a filtering module and a photoelectric detector, the laser source generates an optical signal which is transmitted to the electro-optic modulator, the electro-optic modulator modulates the optical signal after receiving the optical signal, forms a corresponding sideband, the adjustable feedback type array waveguide grating divides the spectrum of the optical signal into different wavelengths, and independently adjusts the amplitude and phase of the optical signals with different wavelengths, then the filtering module filters out the periodically repeated signals, and the photoelectric detector converts the filtered optical signal into an electrical signal, thereby completing the optical-electric conversion. The reconfigurable microwave photonic filter and the filtering method have the advantages of simple structure, highly programmable spectrum shape, fast reconfigurable response and high integration, and will have great attraction in the field of high-frequency signal processing. The application obtains: National Natural Science Foundation of China Youth Science Foundation Project (62204156).

The present disclosure relates to an audio signal processing method implemented by an audio system which includes at least an internal sensor, wherein the internal sensor is located in an ear canal of a user of the audio system and arranged to measure acoustic signals which propagate internally to a head of the user. The audio signal processing method includes: producing an internal audio signal by the internal sensor; determining an audio spectrum of the internal audio signal; determining a spectral center of the audio spectrum; determining a spectrum shape correction filter based on the spectral center; and filtering the internal audio signal by using the spectrum shape correction filter, thereby producing a filtered internal audio signal.

The invention belongs to the technical field of near-infrared spectrum calibration transfer, and particularly relates to a CycleGAN-based non-standard near-infrared spectrum calibration transfer method and a CycleGAN-based non-standard near-infrared spectrum calibration transfer system. Obtaining a non-standard spectrum of a near-infrared spectrometer serving as source equipment, naming the non-standard spectrum as a source domain spectrum, inputting the source domain spectrum into the trained calibration transfer model, and converting the source domain spectrum into a spectrum with target domain spectrum distribution characteristics; the calibration transfer model is constructed based on the CycleGAN, and the identity mapping loss used by a generator in the CycleGAN is optimized for representing the difference between the source domain spectrum and the output of the source domain spectrum input to the generator mapping the target domain spectrum to the source domain. And the difference between the target domain spectrum and the output of the target domain spectrum input to a generator mapping the source domain spectrum to the target domain, and the weight corresponding to the identity mapping loss is a positive number at the initial stage of training and is set to be 0 after the initial stage of training. According to the invention, unnecessary distortion of the spectrum shape structure in the calibration transfer process can be effectively inhibited.

Provided is a discrete Fourier transform (DFT)-spread orthogonal frequency division multiplexing (OFDM) transmission method and transmitter including a phase shifter configured to generate a pi / 2-binary phase shift keying (BPSK) symbol vector by phase-shifting a vector including M BPSK symbols, a DFT spreader configured to generate a DFT-spread pi / 2-BPSK symbol vector by spreading the pi / 2-BPSK symbol vector using an M-point DFT matrix, a circular extender configured to generate a circularly extended pi / 2-BPSK symbol vector by periodically extending the DFT-spread pi / 2-BPSK symbol vector, a frequency domain spectrum shaper configured to generate a frequency domain spectrum shaped pi / 2-BPSK symbol vector by multiplying each element of the circularly extended pi / 2-BPSK symbol vector by each element of a first shaping vector, and a subcarrier allocator configured to allocate the frequency domain spectrum shaped pi / 2-BPSK symbol vector to subcarriers in an allocated frequency range.

A dummy light transmission method, a dummy light identification method, and a related device. A light emitting apparatus performs spectrum shaping on first multi-wavelength dummy light generated by a dummy light source, to obtain second multi-wavelength dummy light, so that a spectral feature of the second multi-wavelength dummy light is different from a spectral feature of service light. The light emitting apparatus selects target dummy light from the second multi-wavelength dummy light to fill an idle band. A light receiving apparatus receives the service light and the target dummy light from the light emitting apparatus. Because the target dummy light and the service light have different spectral features, the light receiving apparatus can effectively distinguish the service light from the target dummy light through spectrum detection and spectrum analysis.

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. An apparatus includes a processor and a transceiver operably connected to the processor. The transceiver is configured to: segment a set of modulated data symbols based on a phase change between N consecutive modulated data symbols to produce Q sets of data symbols; and generating Q sets of DFT extended data symbols based on the Q sets of data symbols. The transceiver is further configured to: frequency domain spectral shaping (FDSS) filtering each of the Q sets of DFT extended data symbols via different FDSS filters to produce Q sets of FDSS filtered data symbols; and combining the Q sets of FDSS filtered data symbols. The transceiver is further configured to: perform an inverse fast Fourier transform (IFFT) operation on the combined Q groups of FDSS filtered data symbols to produce an FDSS discrete Fourier transform extended orthogonal frequency division multiplexing (DFT-s-OFDM) signal; and transmitting the FDSS-DFT-s-OFDM signal, and transmitting the FDSS-

An audio signal decoder (200) for providing a decoded representation (212) of an audio content on the basis of an encoded representation (310) of the audio content comprises a transform domain path (230, 240, 242, 250, 260) configured to obtain a time-domain representation (212) of a portion of the audio content encoded in a transform-domain mode on the basis of a first set (220) of spectral coefficients, a representation (224) of an aliasing-cancellation stimulus signal and a plurality of linear-prediction-domain parameters (222). The transform domain path comprises a spectrum processor (230) configured to apply a spectrum shaping to the first set of spectral coefficients in dependence on at least a subset of the linear-prediction-domain parameters, to obtain a spectrally-shaped version (232) of the first set of spectral coefficients. The transform domain path comprises a first frequency-domain-to-time-domain converter (240) configured to obtain a time-domain representation of the audio content on the basis of the spectrally-shaped version of the first set of spectral coefficients. The transform domain path comprises an aliasing-cancellation stimulus filter configured to filter (250) the aliasing-cancellation stimulus signal (324) in dependence on at least a subset of the linear-prediction-domain parameters (222), to derive an aliasing-cancellation synthesis signal (252) from the aliasing-cancellation stimulus signal. The transform domain path also comprises a combiner (260) configured to combine the time-domain representation (242) of the audio content with the aliasing-cancellation synthesis signal (252), or a post-processed version thereof, to obtain an aliasing reduced time-domain signal.

Methods, systems, and devices for wireless communications are described. Techniques described herein provide for formulating single carrier waveforms into an orthogonal frequency-division multiple access (OFDMA) framework. To fit into the cyclic prefix OFDM (CP-OFDM) grid, a frequency domain fast Fourier transform (FFT) may be applied to the single carrier waveform, a bandwidth expansion and spectrum shaping may be applied to the output of the FFT and inverse FFT (IFFT) processing may be applied to the output of the bandwidth expansion and spectrum shaping. The output of the IFFT may then be represented in an OFDM compatible manner.

The invention relates to the technical field of voice signal processing and audio coding, and discloses a frequency spectrum shaping parameter derivation method in an LC3 coding framework based on a neural network. The method comprises the following steps: performing frequency band energy analysis on an input audio frame, calculating energy of each frequency band according to a preset frequency band division rule, and obtaining multi-frequency band energy information representing spectrum distribution characteristics of the current frame; based on the multi-band energy information, combining a frame-level coding parameter and a transient detection mark, constructing an input feature vector for neural network reasoning, and predicting a spectrum shaping parameter consistent with an LC3 standard by a neural network; and the prediction parameters are further quantized and coded according to the LC3 standard and are used for subsequent spectrum shaping processing, so that on the premise of not changing an LC3 standard bit stream structure and decoder end behaviors, the improvement of a spectrum shaping parameter derivation mode is realized, and the stability and adaptability of coded speech spectrum features are improved.

The invention relates to the technical field of microwave radio frequency front ends, in particular to a sectional type matching microwave radio frequency front end module framework. Comprising a radio frequency input, a power amplifier, a multi-path adjustable switch matching array, a filter bank and an antenna device, and the radio frequency input is connected to the input end of the power amplifier; the output end of the power amplifier is connected with one end of the multi-path adjustable switch matching array; the other end of the multi-path adjustable switch matching array is connected with one end of the filter bank; the other end of the filter bank is connected with the antenna device; the power amplifier is configured to work in a low impedance window; the multi-path adjustable switch matching array is used for selecting a filter; the filter bank is configured to have a low input impedance characteristic and spectrally shaped. Through a sectional matching architecture, the matching network is separated from the filter and the switch module, so that the system can automatically select an optimal impedance path according to different working modes, and high-efficiency matching between low impedance and standard impedance is realized.

The utility model discloses a PUMP laser, which comprises a tube shell, an internal temperature control assembly, a PUMP tube core and an optical fiber assembly, the internal temperature control assembly and the PUMP tube core are packaged in the tube shell, the optical fiber assembly is coupled and aligned with the PUMP tube core and penetrates out of the tube shell from the inside of the tube shell, and the optical fiber assembly is provided with an optical fiber grating part engraved with a grating. The PUMP laser further comprises a fiber bragg grating temperature control assembly used for adjusting and controlling the temperature of the fiber bragg grating part. The PUMP laser has the advantages that the stability of a laser transmission spectrum shape can be improved, the precision is improved, and stable spectrum output at different environment temperatures is realized.

The invention discloses a T2 spectrum form correction method, device and equipment in a tight gas reservoir oil-based mud invasion state and a storage medium, and relates to the technical field of logging data processing in oil-gas exploration. The method comprises the following steps: firstly, acquiring T2 spectrum data of to-be-corrected oil-based mud in a research area in an invasion state, secondly, decomposing the T2 spectrum data by utilizing a T2 spectrum decomposition method combining wavelet transform and Gaussian fitting, and determining a T2 spectrum correction equation by utilizing a fluid replacement method based on a decomposition result; and correcting T2 spectrum data to be corrected in an oil-based mud invasion state by using the obtained T2 spectrum correction equation. According to the method, many problems brought to NMR logging fluid identification after the oil-based mud invades the stratum can be solved more comprehensively and effectively, and more reliable and accurate technical support is provided for tight gas reservoir fluid identification work.