210 results about "Digital filter" patented technology

The invention relates to the technical field of radio frequency signal processing, and discloses a digital filtering repair method and system for signal distortion, and the method comprises the steps: obtaining a frequency domain amplitude-frequency response and a phase response; constructing a phase compensation amount by adopting piecewise polynomial fitting and a phase inversion mechanism; a complex number logarithm domain mapping mechanism is adopted to execute composite frequency response inversion; constructing a switchable hybrid digital filter with an amplitude path and a phase path coupled in parallel; multi-band adaptive scheduling is executed; and outputting the radio frequency baseband signal stream. The technical problems that in the prior art, frequency response nonlinear distortion in a broadband range cannot be dealt with by adopting a fixed template or a single-path filter, and particularly, a high-precision and low-delay dynamic compensation effect cannot be realized in a scene that multi-band coupling interference exists in a radio frequency ADC channel with the bandwidth exceeding 800MHz are solved. Due to the fact that the switchable hybrid digital filter is constructed, accurate modeling and flexible recovery of distortion characteristics in broadband signals are achieved.

The invention relates to the technical field of digital filters, and discloses a quantization sensing wide linear minimum error mode adaptive filter, which performs non-uniform low-bit quantization on an input signal and an expected signal by using a quantization parameter to obtain a corresponding quantization value; constructing a linear factor based on the quantization parameter; based on the non-roundness of the input signal, constructing a normalized correlation matrix of the input signal and the linearized error signal, and constructing a compensation matrix in combination with a linear factor; obtaining input signal quantized values at a current moment and a historical moment, constructing an augmented input signal vector, calculating a product of the augmented input signal vector and the compensation matrix, and constructing a corrected input vector; performing wide linear filtering on the corrected input vector to obtain an output signal, and calculating an error signal in combination with an expected signal quantized value; and updating the weight vector at the next moment by using the corrected input vector and the error signal. According to the invention, by introducing a non-uniform low-bit quantization and deviation compensation mechanism, the cost and energy consumption of the analog-to-digital converter are remarkably reduced, and a relatively low steady-state error is kept.

An ADPLL circuit includes a phase comparator for comparing a phase of a reference clock (REFCLK) input signal with a phase of a digitally controlled oscillator clock (DCO_CLK) signal output from a DCO. The phase comparator includes a first ADC connected to receive a REF_P signal corresponding to the phase of the REFCLK signal via a first switch and output an ADC0 signal and a second ADC connected to receive the signal REF_P via a second switch and output an ADC1 signal. The ADPLL circuit further includes a digital filter for receiving the ADC0 and ADC1 signals and determining therefrom a difference between the phases of the DCO_CLK signal and the REFCLK signal. The digital filter provides a DCO control signal to the DCO to control a frequency of operation of the DCO based on the phase difference.

The application relates to a compact multi-channel battery pack monitoring integrated circuit which comprises a first multiplexing module, a first incremental modulator and a first digital filter; when the first multiplexing module samples the nth first battery monomer, the first multiplexing module receives a first voltage signal and a second voltage signal of the nth first battery monomer, samples the first voltage signal and the second voltage signal of the nth first battery monomer in a first state, and transmits voltage difference information between the first voltage signal and the second voltage signal of the nth first battery monomer to the first incremental modulator in a second state; the first incremental modulator converts the voltage difference information between the first voltage signal and the second voltage signal of the nth first battery monomer into a first digital bit stream; and the first digital filter carries out digital processing on the first digital bit stream according to an extraction algorithm to obtain a digital signal. The application provides a compact and high-precision battery monitoring circuit.

The application belongs to the field of aero-engines, and particularly relates to a real-time correction and repair calculation method for dynamic temperature data of an aero-engine. The method comprises the following steps: step one, correcting the dynamic temperature data, including: S1.1, performing digital filtering processing on the dynamic temperature data; S1.2, performing dynamic error correction on the dynamic temperature data; and step two, repairing bad point data in the dynamic temperature data. The real-time correction and repair calculation method for the dynamic temperature data of the aero-engine not only solves the problem of real-time correction of the dynamic temperature data in an experimental site, but also solves the problem of repairing damaged temperature measuring points through an algorithm.

The present invention relates to a personal awareness system that provides users physical health / wellness / welfare safety as well as online digital safety by blocking inappropriate digital content. The personal awareness system comprises a network protection appliance for use on a local area network (LAN), a software application that is used on a mobile computing device, a cloud-based remote data processing resource to administer the system, artificial intelligence (AI) information systems, and a monitor computing device that an observer can use to monitor, track, and receive alerts related to the user. The system can support many users individually as well as groups of users. In operation, sensors associated with the mobile computing device monitor the health, wellness, and location of users and digital filter rules suppress inappropriate digital content from user access providing digital safety. The mobile computing device seamlessly transitions between LAN environments and wireless mobile environments.

The application discloses a signal interference strategy generation method and device based on deep learning, and a medium, and relates to the technical field of signal interference. The method comprises the following steps: calculating initial path rain attenuation values corresponding to reference level sampling data and real-time level sampling data; filtering a wet antenna attenuation component of the real-time level sampling data through digital filtering based on the initial path rain attenuation values, and determining pure path rain attenuation values of each communication link; inverting the pure path rain attenuation values to obtain path average rain intensities corresponding to each communication link; performing spatial interpolation optimization on a preset interference area to determine a two-dimensional rainfall intensity distribution map; calculating signal propagation time delay of an interference target ray track to obtain interference target corrected coordinates; and determining an interference strategy corresponding to the interference target through link interference parameter calculation and interference window prediction. The application solves the technical problem that the signal interference strategy in the prior art cannot meet the dynamic requirements of an interference signal link in a rainfall environment.

A wireless device is configured to transmit radar signals at extremely low spectral density so that the receiver can be operated at the same time without saturating and thereby enabling full-duplex operation. To achieve sufficient range, beamforming is used together with a very long correlation time for detection of the radar signal, in which case the receiver can resolve backscattered or reflected radar signals far below the noise floor, while the bandwidth of the transmitted radar signal can be very high. The wide bandwidth enables the wireless device to maintain a low power spectral density while increasing output power, and also increase the depth resolution. The extremely low power spectral density even in the transmission beam direction makes the probability that communication will be disturbed very low. The high bandwidth calls for digital filters for both transmitted and received signals to equalize the radar frequency response characteristics of the radio unit.

Adaptive equalization circuitry includes: a digital filter receiving a first polarization signal and a second polarization signal subjected to polarization separation and performing further polarization separation processing; filter tap coefficient update circuitry updating a tap coefficient of the digital filter according to fluctuation in a polarization state; a polarization, separation monitor comparing a correlation value between the first polarization signal and the second polarization signal output from the digital filter with a predetermined value; and control circuitry causing the filter tap coefficient update circuitry to execute initial convergence of the tap coefficient again when the polarization separation monitor detects that the correlation value exceeds the predetermined value.

The application discloses a Helicobacter pylori breath test signal denoising fitting method and system, and belongs to the technical field of medical detection and signal processing. The method processes the continuous monitoring signal of the 13CO2 / 12CO2 isotope ratio in exhalation: firstly, the original signal is subjected to band-pass digital filtering to suppress high-frequency noise; then, low-frequency drift is eliminated through adaptive baseline correction to generate a drift-removed signal; subsequently, a robust peak value recognition algorithm is used to extract physiological response characteristics; finally, the identified peak value is taken as the center, a nonlinear function with physiological constraints is used for local fitting, and the Delta Over Baseline value is calculated based on the generated fitting curve with high precision. The application effectively solves the signal distortion problem caused by breathing fluctuations, instrument noise and the like in in vivo detection, realizes high-fidelity restoration of the Helicobacter pylori metabolic response, and significantly improves the detection accuracy and reliability of the breath test.

The invention discloses a hybrid high-precision frequency weighting method and system and electronic equipment, and the method comprises the steps: obtaining an original sound signal, carrying out the analog-to-digital conversion, and carrying out the preprocessing of the sound signal after the analog-to-digital conversion, so as to obtain a signal frequency spectrum; segmenting the signal spectrum, and weighting each segment to obtain a first weighting sound level and a second weighting sound level; superposing the first weighted sound level and the second weighted sound level to determine a total weighted sound level; and performing dynamic error calibration on the total weighted sound level, determining a standard error, and when the standard error is smaller than or equal to a preset error threshold value, outputting the total weighted sound level. According to the invention, a differentiated optimization strategy is adopted, and the attenuation deviation of a traditional digital filter in a low-frequency area is effectively corrected in a low-frequency band; in the middle and high frequency bands, the accuracy is ensured, meanwhile, the occupation of operation resources is remarkably reduced, the signal processing delay time is shortened, and the response requirement of real-time noise monitoring can be met.

The utility model relates to tire performance test equipment technical field provides a kind of tire vibration signal mechanical filtering device, comprising: mounting base, damping material and vibration sensor mounting seat, the mounting base is fixedly installed on the wheel axle of tire high-speed endurance testing machine, vibration sensor mounting seat bottom is set in the recess on mounting base, the connecting place of vibration sensor mounting seat and mounting base is filled with damping material, vibration sensor is provided on vibration sensor mounting seat, damping material split type is set, the utility model uses mechanical filtering device, filters out the testing machine vibration signal of high frequency, so that the vibration signal of more clear and understandable expression tire is shown vibration signal, compared with traditional digital filtering signal, can filter out interference signal from source, more effectively process high-frequency impact and other abnormal signals, and mounting base, damping material and vibration sensor mounting seat are convenient for installation connection between.

The invention provides an electric power construction site operation safety state real-time monitoring method, which comprises the following steps: acquiring a real-time tension value and a wire elastic elongation from a traction rope connected with traction equipment in a stringing construction operation area, and carrying out digital filtering to obtain a smoothed tension sampling record; the potential avoiding space range and the transverse distance are clustered, the sight line non-shielding length from each clustering center point to the traction rope is evaluated, and the center points with the non-shielding lengths reaching the qualified grade are included into an optimal transverse distance interval set; and extracting the observation response time of each station to the abnormal signal in the tension sampling record in the optimized transverse distance interval set, comparing the theoretical shortest response time with the actual response delay to evaluate the loss degree of the early warning precedent, and identifying the coordinates of the stations needing to be adjusted.

The invention discloses a liquid level recognition stabilizing device for an industrial photocuring 3D printer with a top-mounted light source, and relates to the technical field of photocuring 3D printing equipment.The liquid level recognition stabilizing device achieves self-adaption to complex physical characteristics of photosensitive resin by constructing a multi-sensor fused detection and compensation system; physical authenticity and reliability of liquid level data under various working conditions are ensured, a laser measuring point is transferred from an open main liquid level to a protected stable liquid level, direct interference of optical property difference caused by different resin formulas on reflected light signals is avoided, and the temperature of resin in the bowl is monitored in real time, so that the accuracy of the liquid level data is improved. Dynamic compensation is carried out on a laser measurement value, a laser light path drift error caused by resin temperature change due to environment or reaction heat release is eliminated, moving average filtering and smooth residual random disturbance are applied to collected original data, and finally liquid level data subjected to physical isolation, temperature compensation and digital filtering treatment are output.

The invention discloses an online fault diagnosis method for a thermal resistor of a temperature measurement element, and the method comprises the following steps: S1, data collection and preprocessing: collecting a measurement resistance value (Rt) of the thermal resistor and a corresponding environment temperature (Tenv) in real time, and obtaining a stable resistance value (Rs) through digital filtering processing; s2, initial health state diagnosis: comparing the stable resistance value (Rs) with a theoretical resistance value (Rc) calculated based on the current environment temperature (Tenv), and if the deviation exceeds a first preset threshold value (delta R1), triggering an initial diagnosis process; and S3, preliminary fault diagnosis: starting a parallel diagnosis process comprising at least two different diagnosis sub-modules after triggering the preliminary diagnosis, not only detecting the occurrence of the fault, but also distinguishing possible types of the fault (such as slow response, continuous drifting, instantaneous interference and the like), and providing fault confidence, so that the fault diagnosis accuracy is improved, and the fault diagnosis accuracy is improved. And more accurate guidance is provided for maintenance decision making.

A digitizing circuit includes a port connectable to a device under test (DUT), an integrating analog-to-digital converter (ADC), a high-speed ADC, one or more processors to apply a digital filter to output samples of the high-speed ADC to produce filtered samples, find differences between the filtered samples and samples from the integrating ADC to produce error values, and add the error values to the output samples of the high-speed ADC. A method of producing a digital signal includes receiving an input analog signal at an integrating analog-to-digital converter (ADC) and a high-speed ADC, applying a digital filter to output samples of the high-speed ADC to produce filtered samples, the digital filter matched to timing and filtering of the integrating ADC, finding differences between the filtered samples to output samples of the integrating ADC to produce error values, and adding the error values to the output samples of the high-speed ADC.

The invention provides a digital filter, a parameter configuration method and a chip. The digital filter comprises a multi-order sinc filter and a multi-order comb filter which are connected, the order N and the down-sampling rate of the multi-order sinc filter, the order b of the multi-order comb filter and a plurality of corresponding weight coefficients are pre-determined and configured according to the frequency to be filtered; the multi-order sinc filter receives the coded signal, samples the coded signal for N times according to a preset down-sampling rate, and calculates an average value of each sampling result to obtain an average value signal; the multi-order comb filter performs weighting operation on the mean value signal through the first signal processing unit, the second signal processing unit and the corresponding weight coefficients, and sums the mean value signal through the accumulator to obtain an output signal; the output signal is a coded signal after the signal with the frequency to be filtered is filtered. The parameters of the digital filter are flexibly configured based on different application scenes.

Provided are an optical measurement device, an optical measurement method, a data processing device, and a program, capable of generating data that is a stimulus value that takes into account the time response of an eye and suppresses waveform distortion, capable of performing good flicker measurement, and also capable of coping with a measurement target object having a non-periodic light emission waveform. A stimulus value acquisition unit (20) receives light from a measurement target object to continuously acquire intensities corresponding to stimulus values at constant time intervals; a response characteristic acquisition unit (32) acquires a pulse response characteristic from a storage unit (31) that stores a pulse response characteristic corresponding to a visual stimulus response; and a digital filter processing unit (32) performs digital filter processing on continuous data of the acquired stimulus value intensities using the acquired pulse response characteristic to generate data on which a visual stimulus response is superimposed.

The invention discloses a device and a method for adjusting PLL (Phase Locked Loop) loop bandwidth based on VCO (Voltage Controlled Oscillator) working voltage. The device comprises a phase frequency detector, a digital filter, a digital oscillator and a frequency divider, the phase frequency detector is used for comparing the input signal with the output signal to obtain an error signal; the digital filter is used for processing the error signal; the digital filter comprises a proportional path; the digital oscillator is used for generating an output signal based on the processed error signal; the digital oscillator comprises a switch variable capacitor array; the switch variable capacitor array is used for adjusting the working voltage of the digital oscillator based on the error signal; the proportion path is directly connected with the phase frequency detector and the switch variable capacitor array; the frequency divider is used for carrying out frequency division on the output signal and feeding back the output signal to the phase frequency detector; by modifying the gain coefficient of the proportional path in the phase-locked loop, the adjustment of the loop bandwidth is realized, and the adjustment flexibility is improved.

The invention relates to the technical field of magnetic tape units, in particular to a magnetic tape driver, a magnetic tape unit and a storage system.The magnetic tape driver comprises a read head, an analog equalization circuit and a digital processing chip; the read head is coupled with the analog equalization circuit, the analog equalization circuit is coupled with the digital processing chip, and the analog equalization circuit comprises an active filter; wherein the read head is used for reading an original analog signal from a magnetic tape of a magnetic tape unit and outputting the original analog signal to the analog equalization circuit; the analog equalization circuit is used for performing data equalization on the original analog signal through an active filter to obtain a first analog signal and outputting the first analog signal to the digital processing chip; the frequency response curve of the first analog signal is closer to the frequency response curve of a target signal type than the frequency response curve of the original analog signal, and the target signal type comprises partial response signals; and the digital processing chip is used for converting the analog signal into a digital signal and processing the digital signal. According to the embodiment of the invention, the order of the digital filter in the magnetic tape unit can be reduced.

A digital filter includes a delay line; coefficients coupled to the delay line; and a summer coupled to at least one of the of coefficients, wherein the coefficients each include a first value during a normal mode of operation, and wherein at least one of the coefficients comprises a second value during a transient mode of operation.

An arithmetic processing apparatus according to the present disclosure includes a digital filter. The arithmetic processing apparatus further includes a dummy data input unit configured to input dummy data to the digital filter when there is no input data input to the digital filter. The arithmetic processing apparatus further includes a cancellation processing unit configured to perform, on output data output from the digital filter, arithmetic processing for canceling an output component caused by the dummy data.

The utility model discloses a six-channel direct-current standard meter, which comprises a main control unit, six groups of acquisition units, a large-current acquisition unit, a human-computer interface display unit, a power supply unit and a communication unit, and is characterized in that the six groups of acquisition units and the large-current acquisition unit are electrically connected with the main control unit through a standard bus interface; the main control unit is electrically connected with the human-computer interface display unit and the communication unit, and the main control unit is provided with a first programmable logic chip, a second programmable logic chip and a third programmable logic chip; the first programmable logic chip is used for generating six paths of electric energy pulses; and the main control unit reads ADC data of the acquisition unit through a data bus, obtains voltage and current values after digital filtering, and generates corresponding six paths of electric energy pulses for verification of a to-be-verified meter. The utility model provides a six-channel high-precision direct-current standard electric energy meter which can measure six paths of large voltages, six paths of small voltages and one path of large current at the same time.

Method in an electrical audio signaling circuit comprising a feedback loop (280) with a digital filter (285) coupled to a current-to-digital-to-analog converter (240, 320), the method comprising: providing (560, 625) an output signal from the current-to-digital-to-analog converter (240, 320) to analog elements of the electrical audio signaling circuit, wherein the output signal from the current-to-digital-to-analog converter (240, 320) is based on a reference signal input to the current-to-digital-to-analog converter (240, 320) while no output from the digital filter (285) is input to the current-to-digital-to-analog converter (240, 320); comparing (565, 630) an output signal of the electrical audio signaling circuit with a reference; and calibrating (570, 635) the electrical audio signal circuit, such that the output signal of the electrical audio signal circuit corresponds to the reference,wherein the calibration of the electrical audio signal circuit enables more precise control of a cutoff frequency of a microphone signal, while the output of the digital filter (285) is input into the current-to-digital-to-analog converter (240, 320).

The invention discloses an adaptive tuning high-frequency carrier communication impedance matching and noise suppression system and method, and the system comprises a channel characteristic prediction module which is used for obtaining real-time channel parameters through broadband channel detection, and predicting the channel impedance and noise characteristics at a future moment based on a load event sequence; the prospective self-healing decision engine is connected with the channel characteristic prediction module and is used for performing communication quality degradation trend deduction and root cause analysis based on the predicted channel impedance and noise characteristics and generating a dynamic impedance matching network tuning instruction and a noise suppression filter parameter compensation instruction; the security policy implantation module is used for carrying out encryption and identity authentication on the generated self-healing instruction and issuing the self-healing instruction to a reconfigurable impedance matching network and a digital filter of the physical power line carrier communication module through a management channel; according to the system, the impedance change trend can be predicted in advance, an accurate tuning instruction is generated, optimal suppression bandwidth calculation is achieved, and timeliness of transient response is guaranteed.

The embodiment of the present disclosure provides a signal processing device, a signal processing method, an electronic device and a storage medium. The signal processing device comprises: a signal processing circuit, configured to receive a first transmission parameter of an input signal associated transmission path through an input interface; perform frequency resampling on the first transmission parameter to obtain a second transmission parameter based on a predetermined frequency parameter, and determine a first frequency response of the transmission path based on the second transmission parameter; wherein the first frequency response is associated with embedded processing or de-embedded processing of the input signal; perform conjugate symmetric processing on the first frequency response to obtain a second frequency response which is a complex conjugate symmetric of the first frequency response; perform frequency domain to time domain conversion on the second frequency response to obtain an impulse response of the transmission path; determine a filter parameter of a digital filter based on the impulse response; and the digital filter is configured to process the input signal based on the filter parameter to obtain an output signal.

The application discloses a fundamental wave extraction method under frequency offset based on a linear neural network, and has the advantages of high extraction accuracy, adaptability to frequency disturbance and the like. A traditional digital band-pass filter cannot change its center frequency after design, when the frequency and amplitude of an input signal are offset, the output signal of the traditional digital filter will be phase-shifted and attenuated to different degrees in amplitude, and even waveform distortion will occur, so the traditional digital band-pass filter needs to be redesigned, which is complicated and greatly increases the design cost. The band-pass digital filter against frequency offset based on the adaptive linear neural network can adaptively filter according to the frequency and amplitude changes of the input signal, and thus has strong robustness for frequency-amplitude random fluctuation signal detection, and can be applied to fundamental wave signal extraction of power grid voltage / current and the like.

The present invention belongs to the technical field of electroacoustics in electronics, and relates to an audio system formed by a speaker-enclosure planar array, and a preparation method for the audio system. Different from the prior art, the present invention uses a plurality of small / -micro-aperture speakers to form a special planar array audio device, such that by using the plurality of small- / micro-aperture speakers, audio signals with frequencies of 20-120 Hz or even higher, which are typically cut off in small-aperture speaker systems, are caused, by means of synchronous superposition operation, to output powerful, clear and pure bass sound waves. Moreover, an algorithm for a linear digital filter is used to perform frequency division and surround sound processing on digital audio signals of the speakers without generating a phase shift. Therefore, a series of functional defects in conventional large-aperture subwoofers are overcome, thereby enabling the planar-array audio system to achieve a surround sound effect in a three-dimensional or two-dimensional space.