713 results about "Low frequency band" patented technology

The invention discloses a broadband oscillation identification method and system based on a multi-band Nyquist criterion, and the method comprises the steps: dividing the frequency of broadband oscillation into a low frequency band, a middle frequency band and a high frequency band with overlapped frequency bands, and obtaining the oscillation signals of a monitoring node in a power grid in different frequency bands; respectively calculating the equivalent impedance of the non-overlapped frequency band of each frequency band and the equivalent impedance of the overlapped frequency band in the two adjacent frequency bands so as to construct the equivalent impedance of the low frequency band, the middle frequency band and the high frequency band with the overlapped frequency bands; establishing a Nyquist criterion of each frequency band based on a transfer function of dynamic characteristics of each frequency band in an open-loop state of the system; a generalized Nyquist criterion of the overlapped frequency bands is constructed by using the multi-frequency-band coupling matrix; constructing a comprehensive decision function according to the recognition result of the generalized Nyquist criterion on the system stability, the broadband oscillation comprehensive characteristic quantity and the change rate of the high-frequency-band impedance module value along with the frequency; and according to the value of the comprehensive decision function and a threshold value, a broadband oscillation identification result is determined, and the broadband oscillation identification capability is improved.

The invention discloses a liquid crystal display screen gray scale control method based on adaptive brightness compensation, which relates to the technical field of liquid crystal display screen control, and comprises the following steps: collecting environmental spectrum distribution information and a pixel gray scale voltage response curve of a liquid crystal display screen in real time, and carrying out fusion processing to form a time sequence joint feature vector; through multi-mode synchronous sampling and time sequence joint feature vector generation, ambient light and screen content changes are accurately captured, target adjustment values of backlight power and gray scale voltage are dynamically predicted, and response lag and overshoot are avoided. Through spectral domain balancing and a self-adaptive damping scheduling mechanism, cooperative control of backlight and gray scale is optimized, high-frequency oscillation is suppressed, and linear response of a low-frequency band is ensured. Meanwhile, Gamma mapping and global color gamut calibration are dynamically refreshed, accurate adjustment of area-level brightness and gray scale is achieved, and continuity of the display effect and visual experience of a user are improved.

The invention discloses a frequency division control radio frequency power supply solid-state impedance matcher and a method thereof, and aims to solve the problems that a traditional mechanical impedance matcher is slow in response, low in adjustment precision and difficult to adapt to a dynamic load. According to the system, an all-solid-state impedance matcher is adopted, impedance dynamic adjustment is achieved through a matching network composed of an adjustable inductance module and a switched capacitor module, closed-loop control is constructed in combination with a radio frequency signal detection module and a digital signal processor, and a frequency division control strategy is adopted, and the high-frequency band realizes high-precision matching through a control strategy of coarse adjustment of the adjustable inductance module and fine adjustment of the switched capacitor module. The device has the advantages of high response speed, wide frequency band coverage and the like, and is particularly suitable for industrial plasma application scenes with remarkable dynamic impedance characteristics.

The invention provides a motor multi-band vibration suppression method and a motor multi-band vibration suppression device based on electromagnetic-mechanical cooperative regulation and control. According to the method, vibration signals are collected in real time, and spectral analysis is carried out to identify vibration frequency distribution; dividing the vibration signal into a low-frequency band, a middle-frequency band and a high-frequency band according to a spectral analysis result, and respectively corresponding to a mechanical vibration source, an electromagnetic excitation source and a structural noise source; a control strategy is dynamically selected based on a vibration frequency band, a low-frequency band triggers a mechanical regulation and control module to output a reverse force to perform vibration suppression, a middle-frequency band triggers an electromagnetic control module to optimize a current waveform and a PWM modulation mode, and a high-frequency band starts a cooperative control strategy of the electromagnetic and mechanical control module; through real-time communication between the controller and each module, vibration feedback signals are continuously monitored, and control parameters are dynamically adjusted according to working condition changes so as to maintain the vibration suppression effect. According to the invention, through cooperative adjustment of electromagnetic control and a mechanical structure, active suppression of vibration of the motor in multiple frequency bands is realized.

The invention discloses a noise reduction method and device, equipment, a storage medium and a program product, and relates to the technical field of audio processing, and the method comprises the steps: collecting a bone conduction signal and at least two paths of environment air conduction signals of an earphone wearer through an earphone, based on the bone conduction signal, performing first noise reduction processing on a target air conduction signal of a target direction determined based on the at least two paths of environment air conduction signals to remove a first air conduction component of a relatively low frequency band of an earphone wearer, and obtaining an initial noise-reduced signal; and performing second noise reduction processing on the initial noise-reduced signal based on the bone conduction signal, the at least two paths of environmental air conduction signals and the phase difference of the at least two paths of environmental air conduction signals, so as to remove a second air conduction signal of a higher frequency band of the earphone wearer, and obtain a target noise-reduced signal. According to the method and the device, the noise generated by the earphone wearer in the audio recorded by the earphone is effectively removed.

The present invention discloses a speaker and electronic device improved with a high-density FER molecular sieve. The rear cavity of the speaker is filled with a high-density FER molecular sieve; the raw powder of the FER molecular sieve has a non-flake micromorphology, a thickness-to-width ratio of ≥1:20 and <1:1, and a loose bulk density greater than 0.15 g / cm 3 The speaker provided by the present invention is filled with a high-density FER molecular sieve with a specific raw powder morphology in the back cavity, which increases the acoustic compliance of the air in the back cavity, thereby improving the performance of the speaker in the low frequency band.

The invention provides a battery broadband electrochemical impedance spectroscopy time domain rapid detection method and system, and the method comprises the steps: S1, dividing a target signal frequency band into a low frequency band, a middle frequency band and a high frequency band from low to high, and setting the parameters of an excitation signal DIBS of each frequency band; s2, enabling the discrete binary sequence to have spectrum distribution corresponding to the target signal through an optimization algorithm, and obtaining a DIBS signal containing all set frequency points; s3, performing current excitation on the battery by adopting DIBS excitation signals of different frequency bands to obtain excitation current and response voltage; and S4, respectively calculating the frequency spectrums of the excitation current and the response voltage under the three frequency bands, and obtaining the final impedance. A multi-band excitation mode is adopted, the sequence length of a single-segment signal is shortened, the clock period of the single-segment signal is prolonged, and the storage burden of excitation equipment and the data processing complexity of a time-frequency conversion algorithm are effectively prevented from being aggravated due to the long sequence period.

The invention relates to the technical field of wireless communication, and provides a power amplifier, a power amplification module and a multi-mode multi-frequency power amplifier, the power amplifier comprises a first-stage low-frequency power amplifier, a second-stage low-frequency power amplifier, a harmonic suppression circuit, a first output matching circuit, a first filter circuit and a second filter circuit; the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier are used for amplifying low-frequency-band signals, the harmonic suppression circuit is used for suppressing harmonic waves output by the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier, and the output end of the first output matching circuit is used for outputting signals; and the first output end of the first filter circuit and the output end of the second filter circuit respectively provide filtered power supply voltage for the first-stage low-frequency power amplifier and the second-stage low-frequency power amplifier. According to the invention, the harmonic leakage of the multi-mode multi-frequency power amplifier can be optimized.

The invention relates to a laser radar on-chip integrated chip based on acousto-optic modulation, an on-chip acousto-optic scanning method and a laser radar system. A plurality of groups of interdigital transducers are arranged on the lithium niobate film, two groups of chirp IDTs respectively work at a low-frequency band and a high-frequency band, and sound waves at the low-frequency band correspondingly generate a relatively large Bragg deflection angle; and the high-frequency-band sound waves correspondingly generate a relatively small Bragg deflection angle. The two groups of IDTs work cooperatively, so that two-dimensional vector scanning of a dual-frequency broadband can be realized in a chip plane; the pair of focusing IDTs can form a focusing sound field in an action area, so that the light beam subjected to two-dimensional deflection is controllably deflected in the Z direction, and the chip is endowed with the three-dimensional scanning capability. The device is high in diffraction efficiency and low in power consumption; unification of large-range search and high-precision scanning is realized; z-axis deflection is realized by integrating a special focusing type interdigital transducer, a three-dimensional scanning function is realized on a monolithic integrated acousto-optic chip, and the structure is extremely compact.

The invention provides an antenna assembly and electronic equipment. The antenna assembly is applied to the electronic equipment, the electronic equipment comprises a middle frame and a mainboard, and the antenna assembly comprises a feeding point, a first ground feeding point, a second ground feeding point and a radiator; the radiator comprises a first sub-radiator and a second sub-radiator, and the first sub-radiator and the second sub-radiator comprise a common branch knot; the first sub-radiator is connected between the feeding point and the first ground feeding point to form a first radiation loop; the second sub-radiator is connected between the feeding point and the second ground feeding point to form a second radiation loop; the first radiation loop is used for transmitting or receiving a signal of an intermediate frequency band, and the second radiation loop is used for transmitting or receiving a signal of a low frequency band and / or a high frequency band. Therefore, the antenna assembly has good antenna efficiency in a small clearance space.

An image blur correction device acquires a blur detection signal, and separates it into a high frequency band signal component and a low frequency band signal component using an HPF and an LPF. A high frequency side prediction processing unit acquires an output of the HPF, and a low frequency side prediction processing unit acquires an output of the LPF via a down-sampler. A prediction processing unit updates a filter coefficient of a prediction filter using an adaptive algorithm, and performs linear prediction on the blur detection signal. An adder adds an output of the high frequency side prediction processing unit to an output of the low frequency side prediction processing unit via a up-sampler, and outputs a superimposed output signal. Image blur correction control is performed on the basis of a superimposed output signal.

The invention discloses a double-frequency slot antenna structure with a back cavity and a design method, which are used for an omnidirectional communication system. The antenna can work in two frequency bands, the antenna comprises a disc metal cavity, eight arc-shaped gaps above the cavity, and some metal columns and metal sheets in the middle of the cavity, and the antenna feeds the gaps from the center of the bottom of the cavity in a coaxial probe feeding mode; a filtering mechanism is formed through a metal column and a metal sheet in the middle of the cavity, and high frequency is blocked through low frequency, so that high-band radiation waves are limited in the small cavity in the middle and then are radiated out from four first arc-shaped gaps above, and low-band radiation waves are radiated out from four second arc-shaped gaps above the whole disc cavity after passing through the filtering mechanism; high-frequency energy and low-frequency energy can be separated, different cavity sizes are formed at different frequencies, and working frequency radiation is controlled by combining the length of the gap.

The application discloses an improved loudspeaker and electronic equipment of ITH molecular sieve. The loudspeaker is filled with ITH molecular sieve in the back cavity; the ITH molecular sieve is composed of a skeleton and cations outside the skeleton, the skeleton comprises silicon dioxide and an oxide of a non-silicon element M, a Si / M molar ratio is at least above 80, preferably above 100; the ITH molecular sieve contains uniform micropores, the micropore size is 0.4nm to 0.55nm, and the micropore volume is 0.10 to 0.25cm 3 / g. The loudspeaker contains ITH molecular sieve in the back cavity, the acoustic compliance of the air in the back cavity is increased, and thus the performance of the loudspeaker in a low frequency band is improved.

The invention discloses a laser piston sounder normal vector microphone low-frequency calibration device and method, and solves the technical problems that the calibration frequency range is limited, the model dependence is strong and the environmental noise interference is obvious in a low-frequency band in the existing vector microphone calibration method. The device comprises a piston sounder, a laser interferometer, a vector microphone and a data acquisition system, the piston sounder comprises a piston, an excitation source and a piston cavity, an end cover of the piston cavity is provided with an optical window, and the laser interferometer measures the movement speed and displacement of the piston through the optical window; the vector microphone is hermetically coupled to the piston sounder from the side wall of the piston cavity through the adapter; and electric signal outputs of the laser interferometer and the vector microphone are connected to an input channel of the data acquisition system. The calculation model of the sound pressure and the particle vibration velocity in the piston sounder is clear, does not depend on the type of a piston excitation source, and is high in universality.

The invention relates to the technical field of sound absorption composite materials, in particular to a porous composite material capable of enhancing sound absorption performance and a preparation method and application of the porous composite material capable of enhancing the sound absorption performance. And high-efficiency sound absorption can be realized in the full frequency band of 100Hz-6000Hz. Especially in the low-frequency band of 200Hz-1000Hz, the sound absorption coefficient is increased by 20%-50% compared with that of a traditional porous material with similar thickness and weight, and the problem that the traditional material is insufficient in low-frequency sound absorption is solved.

The invention discloses an acoustic black hole structure and a vibration damping device.The acoustic black hole structure comprises an acoustic black hole body and a damping layer, the acoustic black hole body is provided with a uniform thickness area and an acoustic black hole area, the acoustic black hole area is provided with a plurality of grooves, the grooves are distributed from the first end to the second end of the acoustic black hole area, and the damping layer is arranged between the first end and the second end of the acoustic black hole area. The depths of the grooves are gradually increased in the direction from the first end to the second end, and the damping layer is arranged in the acoustic black hole area. By machining the groove in the acoustic black hole area, the local bending rigidity of the acoustic black hole body is changed, the bending wave speed of the acoustic black hole body is reduced, the acoustic black hole effect is achieved, due to the arrangement of the groove, the local resonance effect can be utilized, and then structural vibration suppression in the low-frequency range is achieved; the problem that a traditional acoustic black hole structure is poor in low-frequency-band vibration reduction effect is solved, in addition, thickness cutting of an acoustic black hole area of an original structure is avoided, and the manufacturing difficulty and the requirement for the precision of machining equipment are lowered.

The invention provides a CEEMDAN-SSA-based power distribution network fault identification method, and the method comprises the steps: receiving a traveling wave signal of a power distribution network, and carrying out the preprocessing of the traveling wave signal; decomposing the preprocessed traveling wave signal by adopting CEEMDAN to obtain an intrinsic mode function component set, and selecting a high-frequency intrinsic mode function component from the intrinsic mode function component set; performing noise reduction on the high-frequency intrinsic mode function component by using singular spectrum analysis to obtain a pure fault feature signal; analyzing and reconstructing the frequency spectrum characteristics of the pure fault characteristic signal by using fast Fourier transform, and calculating the average frequency spectrum content of the low-frequency-band signal and the amplitude ratio of the high-frequency-band signal according to the frequency spectrum characteristics; and generating a fault identification result of the power distribution network by taking the average frequency spectrum content of the low-frequency-band signal as a main criterion and taking the amplitude proportion of the high-frequency-band signal as an auxiliary criterion according to the fault traveling wave transmission characteristics. Therefore, high-precision power distribution network fault identification can be realized in a complex working condition and a high-noise environment.

The invention relates to a lower frequency band radiating element with reduced scattering of higher frequency band radiation. A radiating element includes: a feed stem printed circuit board including a first RF transmission line and a second RF transmission line; a first dipole radiator coupled to the first RF transmission line; and a second dipole radiator coupled to the second RF transmission line. The first dipole radiator comprises a first dipole arm and a second dipole arm, and the second dipole radiator comprises a third dipole arm and a fourth dipole arm. A first amount of coupling between the first dipole arm and the third dipole arm exceeds a second amount of coupling between the first dipole arm and the fourth dipole arm.

The invention discloses an optimization method of a butterfly-shaped UHF antenna, and the method comprises the following steps: determining a preset angle range of a semi-apex angle based on the matching relation between the characteristic impedance of the butterfly-shaped antenna and the working frequency band width, so as to achieve the stable change of the input impedance and the broadening of the frequency band; according to the wavelength of the low-frequency end of the working frequency band, a preset proportional relation between the arm length and the wavelength is established to determine the value of the arm length, so that the requirement of the antenna impedance bandwidth on low-frequency-band signal receiving is met; a butterfly antenna is arranged in a metal back cavity to form a back cavity type antenna, the height of the back cavity is determined according to the wavelength corresponding to the strongest frequency of a signal so as to suppress back radiation and enhance forward radiation gain, and systematic improvement of electromagnetic wave signal receiving performance is realized through collaborative optimization of structural parameters of the butterfly antenna and the back cavity.

The invention relates to the technical field of power electronic converters, in particular to a converter networking control method with a low-frequency impedance remodeling function. Comprising a network construction control module, a virtual impedance control module, a first coordinate transformation module, a second coordinate transformation module, a third coordinate transformation module, a current control module, a voltage filtering module, a low-frequency impedance remodeling module and a coordinate inverse transformation module. According to the method, low-frequency-band positive impedance is achieved, the stability of the power electronic converter in a weak power grid environment is improved, meanwhile, the modular design is easily integrated into an existing converter system, the oscillation risk caused by fundamental frequency negative impedance is thoroughly eliminated, broadband compatibility is achieved, the 0-200 Hz harmonic range is covered, and the performance is optimized through an adjustable remolding coefficient kz.

The invention relates to the technical field of mobile phone antennas, in particular to a mobile phone antenna and electronic equipment for exciting a floor characteristic mode based on a shunt feed technology, and the mobile phone antenna comprises a dielectric substrate, an antenna radiation metal patch on the outer side of the dielectric substrate, a metal floor arranged below the dielectric substrate, a low-frequency inverted-F antenna and a power divider, a first low-frequency feed port and a second low-frequency feed port are respectively arranged on corresponding radiation patches on two sides of the metal floor, and the two feed ports are simultaneously and electrically connected with an output end of the power divider through feeder lines, so that parallel feed of the low-frequency inverted-F antenna is realized, low-frequency characteristic modes of two long sides of the metal floor are simultaneously excited, and the low-frequency inverted-F antenna is formed. The low-frequency-band radiation efficiency is improved, the working bandwidth is expanded, and integration with a radio frequency circuit of the whole mobile phone can be completed only through a single excitation source.

A down-sampling function folds the thermal noise into a lower frequency band. A capacitor samples a voltage during a period of bus inactivity and supplies the sampled voltage to an input of operational amplifier in a loop filter of a phase-locked loop when the bus is active. The sampling frequency determines the reduction in thermal noise that can be achieved. The PLL generates a clock signal for a bus. A voltage generator charges the capacitor through a transistor when the bus is inactive. The transistor turns on responsive to the bus being inactive to allow the capacitor to charge and the transistor turns off responsive to the bus being active to isolate the capacitor and operational amplifier from the voltage generator. When the bus is active, the voltage across the capacitor is supplied to the operational amplifier.

A discharge detection unit 1 that can detect noise superimposed on a voltage or current of an electric circuit to which the load is connected by being electrically connected to an electric circuit to which a load is connected, the discharge detection unit includes a filter unit 11 that can output a waveform of passed noise in a high frequency band without passing noise at a commercial frequency band and in a low frequency band by cutting noise of a predetermined frequency or lower superimposed on the voltage or current of the electric circuit, a counting unit 12 that can calculate the number of waveform detections in a predetermined time from a waveform passed through the filter unit, and an arithmetic processing unit 13 that can determine presence or absence of noise caused by discharge in the electric circuit using the number of times detected calculated by the counting unit.

The invention discloses a double-frequency phase independent regulation and control metasurface unit and an application method. The metasurface unit comprises a dielectric substrate; the two sides of the dielectric substrate are covered with a first metal layer and a second metal layer respectively. Each of the first metal layer and the second metal layer comprises a metal patch main body and a phase regulation and control structure, the center of the metal patch main body is provided with a circular hollow, and the phase regulation and control structure is arranged in the circular hollow; the phase regulation and control structure of the first metal layer and the phase regulation and control structure of the second metal layer are in 180-degree rotational symmetry; the double-connecting-ring structure is an axisymmetric structure; an open circular split ring resonator is arranged in the double-connecting-ring structure, and an electromagnetic isolating ring group is arranged in the open circular split ring resonator; according to the invention, 360-degree independent phase control on electromagnetic waves at a low-frequency band and a high-frequency band is realized.

The invention provides a multimode radio frequency power amplifier module, a radio frequency chip and a mobile terminal. The module comprises two power amplifiers, four switching circuits and a control circuit, an input GSM low-frequency-band radio-frequency signal and a low-frequency-band radio-frequency signal of other communication systems are input into the low-frequency-band power amplifier through the first input switch circuit, and the output of the low-frequency-band power amplifier is connected with one of the low-frequency-band radio-frequency output ports through the first output switch circuit. An input GSM high-frequency-band radio frequency signal and a medium-frequency-band radio frequency signal of other communication systems are input into the medium-frequency-band power amplifier through a second input switch circuit, and the output of the medium-frequency-band power amplifier is connected with one of the medium-frequency-band radio frequency output ports through a second output switch circuit; and the control circuit provides proper working voltage for the low-frequency-band power amplifier and the middle-frequency-band power amplifier respectively. The integration level of the radio frequency amplifier module is improved, the area is reduced, and the cost of the mobile terminal is reduced.

The present disclosure provides a method for optimizing a broadband noise of an inductive magnetic field sensor as well as a magnetic field sensor, including: determining a functional relationship between an induced voltage of a coil and an effective permeability of a magnetic core of the inductive magnetic field sensor; determining an equivalent voltage noise expression of a temperature variation-induced permeability noise of the magnetic core according to the functional relationship; determining a key influencing factor of the magnetic core according to the equivalent voltage noise expression of the temperature variation-induced permeability noise of the magnetic core; modifying the magnetic core according to the key influencing factor of the magnetic core to optimize the temperature variation-induced permeability noise of the magnetic core; and constructing a dual-channel composite multi-stage modulation signal-noise separation circuit to optimize a low-frequency band noise and a high-frequency band noise of the inductive magnetic field sensor.

The invention discloses a dual-frequency ground penetrating radar underground target saliency feature fusion method, which comprises the following steps of: before target feature detection, removing a direct wave strong interference signal in GPR echo data; designing a semantic feature extraction model, fusing a channel attention SE module and a space attention PSANet module into a feature extraction network, and adding phase consistency loss and phase change region gradient loss into a loss function during network model training; transpose convolution is carried out on the extracted low-frequency-band semantic feature map in the double-frequency GPR data, upsampling is carried out to the scale of the high-frequency-band semantic feature map, and high-frequency-band and low-frequency-band feature fusion is carried out. According to the fusion method, the high-frequency-band GPR echo signal contains target information with higher resolution, the low-frequency-band GPR can detect a target located at a deeper position underground, the contradiction problem between the GPR detection depth and the detection precision is effectively solved, and the method has the advantages of being high in precision and robustness.

The invention relates to a device and a method for deeply degrading organic matters in wastewater, the device comprises a shell, a water inlet area, a reaction area and a water outlet area are sequentially arranged in the shell along the moving direction of the wastewater, and the reaction area is respectively communicated with the water inlet area and the water outlet area; at least one set of ultrasonic energy concentrator is arranged in the water inlet area; an ultrasonic wave generation module is arranged in the reaction area, and the ultrasonic wave generation module comprises a low-frequency band, a middle-frequency band and a high-frequency band which are sequentially arranged in the wastewater moving direction; and the water inlet area and the reaction area are also filled with a supported catalyst. The contact electro-catalysis effect is excited through ultrasonic waves, metal elements of the supported catalyst are subjected to dynamic valence state transformation, and oxidizing active free radicals are continuously generated; the low-frequency section, the middle-frequency section and the high-frequency section are sequentially arranged in the reaction area, quenching of oxidative activity free radicals is synergistically reduced, uniform distribution of the oxidative activity free radicals is promoted, and wastewater organic matter reacts with the oxidative activity free radicals to be degraded.

The invention discloses a stabilizing grid-connected fluctuation double-layer control method and system based on multi-type cooperative hydrogen production, and the method comprises the steps: carrying out the decomposition processing of an original wind-light fluctuation signal through an improved EMD wind-light power decomposition algorithm, and obtaining all-order modal signal components of wind-light power; performing superposition reconstruction on each order of modal signal component of the wind-light power according to a low frequency band and a high frequency band to obtain a low frequency component and a high frequency component; the low-frequency component is directly merged into a power grid or used for producing hydrogen; the high-frequency component is used as a task power component stabilized by the hybrid energy storage unit; fluctuating power is distributed to hydrogen production electrolytic tanks of set types through an inner-layer ALK-PEM water electrolysis hydrogen production strategy, and the operation economical efficiency of the hybrid energy storage unit is improved; an energy coupling complementation mechanism is constructed through a hybrid energy storage control strategy for stabilizing fluctuation of an outer layer in combination with the operation characteristics of an energy storage module, and the energy and capacity utilization rate is improved. According to the method, the wind-light fluctuation can be obviously stabilized, the optimal power distribution of the hybrid energy storage task is realized, and the new energy grid-connected efficiency is effectively improved.

In some aspects, a method, a system, or a non-transitory computer-readable storage medium are described for a foundation model for use in pathology, by providing an input dataset representing a plurality of pathology images as input to a backbone of the foundation model, wherein the plurality of pathology images comprises patches having different levels of pixel resolution; producing, with the backbone of the foundation model, a plurality of vector embeddings based on the input dataset; adjusting weights associated with the backbone of the foundation model based on the plurality of vector embeddings by using a Fourier reconstruction loss function configured to separate portions of the patches in accordance with a high-frequency band and a low-frequency band; and storing the foundation model on at least one storage device.