69 results about "High frequency modulation" patented technology

The invention discloses an HRR-based acoustic fire hazard type identification method, device and equipment and a medium, and relates to the technical field of fire hazard detection, and the method comprises the steps: obtaining an original acoustic signal through transmitting a high-frequency modulation ultrasonic wave and receiving a flame region reflection echo, obtaining channel impulse response data through channel estimation, and carrying out the channel impulse response data; flame features are extracted, a heat release rate curve is calculated and generated, finally fire type identification and fire behavior stage determination are completed based on the curve, dense smoke, shielding and illumination interference can be resisted, accurate quantification of the heat release rate is realized, fire type identification and fire behavior development stage determination can be finely carried out, and the accuracy of fire behavior determination is improved. And a stable and reliable technical support is provided for fire monitoring and emergency decision making.

The invention discloses a transmission type communication system and method based on low-frequency carrier waves and high-frequency modulation. The transmission type communication system and method are suitable for complex medium environments such as deep sea, strata and biological tissues. Aiming at the contradiction that the traditional low-frequency communication bandwidth is insufficient and the high-frequency communication penetrating power is poor, according to the scheme, a low-frequency carrier wave (30Hz-100kHz) and a high-frequency modulation signal (such as OFDM (Orthogonal Frequency Division Multiplexing) and 256QAM (Quadrature Amplitude Modulation)) are fused through a nonlinear signal superposition technology to generate a composite carrier wave signal, long-distance penetration is realized by utilizing the low attenuation characteristic of the low-frequency carrier wave, and meanwhile, the data rate is improved through high-frequency modulation. Application scenes comprise deep sea detection (300-meter high-definition video return), a brain-computer interface (implantable antenna transmission neural signal) and an intelligent power grid (underground pipe network monitoring). Through the physical layer-information layer collaborative design, the physical boundary limitation of traditional communication is broken through, and high penetrability, high bandwidth and strong anti-interference capability are achieved.

The invention belongs to the technical field of photoelectric detection imaging, and particularly relates to a dim target enhancement device and method based on range gating polarization imaging, the device comprises a transmitting system and a receiving system, the transmitting system comprises a pulse laser, a signal modulation circuit and a transmitting optical system; the pulse laser is used for emitting laser beams; the signal modulation circuit is used for generating a high-frequency modulation electric signal and modulating a laser beam emitted by the pulse laser; the emission optical system is used for focusing and adjusting the light beam direction and the emergent light polarization state; the receiving system comprises a receiving optical system, a focal plane polarization detector, a synchronous control board, a signal processing board, an image processing board and display control equipment; according to the device, the pulse illumination module, the time synchronization control module and the polarization imaging module are integrated, and an image definition evaluation algorithm is combined, so that synchronous acquisition and fusion of target polarization information and distance information are realized.

The invention discloses a sensorless control method for an electrically excited synchronous motor based on a rotor switching signal, and relates to the technical field of motor control, the inherent high-frequency modulation switching signal of an EESM rotor circuit (in a buck converter form) is utilized, and an effective stage (AS) and an ineffective stage (IAS) are divided based on the unipolarity characteristic of a rotor modulation voltage; a stator current gradient is directly calculated at the AS to extract position information, a fundamental current component is estimated at the IAS to be used for compensation, magnetic coupling saturation compensation and rotor PWM frequency optimization are combined, and full-rotating-speed sensorless control is achieved.

The invention relates to the technical field of power system frequency control, and particularly discloses a power optimization distribution control method based on a wind storage combined frequency modulation system, which comprises the following steps of: synchronously acquiring a power grid frequency modulation instruction, wind power output, an energy storage charge state and adjustable power capacity data; extracting wind power fluctuation frequency and amplitude characteristics and energy storage charge and discharge depth and response rate characteristics; by taking the features as state constraints, constructing a multi-objective optimization model taking the highest frequency modulation tracking precision and the minimum energy storage life loss as objectives, and solving the multi-objective optimization model to obtain a power optimal distribution coefficient; generating a wind power smoothing instruction and an energy storage amplitude limiting instruction according to the coefficient, and issuing and executing; collecting actual response data to calculate deviation, and dynamically correcting a weight coefficient and a constraint boundary of the optimization model; according to the invention, dynamic collaborative optimization of wind storage power is realized, and energy storage cycle loss and response deviation can be reduced.

Selective high-frequency spinal cord modulation for inhibiting pain with reduced side effects and associated systems and methods are disclosed. In particular embodiments, high-frequency modulation in the range of from about 1.5 KHz to about 50 KHz may be applied to the patient's spinal cord region from an epidural, cervical location to address at least one of high back pain, mid-back pain, low back pain, and leg pain without creating paresthesia in the patient.

The invention discloses a coal power unit regulation and control method and system coupling fused salt heat storage and compressed air energy storage, and the method comprises the following steps: an energy storage stage: heating fused salt and compressed air energy storage by using redundant electric power of a coal power unit, and meanwhile, heating the fused salt by using compression heat generated in a high-temperature and high-pressure steam and compressed air energy storage process; in the energy release stage, the fused salt releases the stored heat, the heat is transferred to the coal power unit through the heat exchanger, and meanwhile, the compressed gas enters the expansion machine to do work after being heated by the heat exchanger to drive the coal power unit to generate power; and in the frequency modulation stage, a graded frequency modulation mode is determined based on the frequency difference between the real-time frequency and the rated frequency of the power grid, and the optimal power distribution scheme of the coal power unit, the fused salt heat storage and the compressed air energy storage in the frequency modulation process is determined by taking frequency modulation income maximization as an optimization target. The method can better adapt to the complex fluctuation of the power grid frequency, and the cooperation of the wide heat storage capacity and the high frequency modulation rate of the coal power unit is realized.

The invention relates to a semiconductor lamp control method and an intelligent electric appliance, which are applied to the field of intelligent electric appliances, and the semiconductor lamp control method comprises the following steps: driving a semiconductor lamp to illuminate through a high-frequency sine wave current signal; the high-frequency sine wave current signal is obtained by modulating an original current signal for driving the semiconductor lamp to illuminate; collecting a current output signal output by the photoelectric sensor when the semiconductor lamp illuminates; determining the attenuation degree of the semiconductor lamp through a lock-in amplifier based on the phase difference between the high-frequency modulation current signal and the current output signal; and controlling the semiconductor lamp based on the attenuation degree. According to the invention, the problem of illumination response delay caused by aging of the semiconductor lamp is solved.

The invention provides an electronic cigarette cartridge communication encryption system and method based on a high-frequency analog signal, and the method comprises the steps: applying a high-frequency sweep frequency excitation signal to a cartridge through a dual-contact path shared by communication and heating after the cartridge is inserted; acquiring a response voltage signal of the smoke cartridge, and extracting a frequency domain amplitude feature from the response voltage signal to form a feature vector representing the physical identity of the smoke cartridge; generating an authentication factor based on the feature vector, and generating a carrier frequency and a response time window parameter required by communication; constructing a high-frequency modulation signal containing phase and amplitude disturbance according to the authentication factor and the modulation parameter, and sending the high-frequency modulation signal to the smoke cartridge through the double-contact path; receiving a reflection echo signal returned by the smoke cartridge end, carrying out time domain and phase characteristic analysis on the reflection echo signal, judging whether the response time is in an expected time window or not and whether the phase structure is matched or not, and outputting an authentication result; and executing a corresponding action according to the authentication result.

The invention discloses an industrial power-saving system and method based on multi-frequency-band conflict avoidance and energy feedback, and relates to the technical field of industrial power-saving systems.The method comprises the steps that a power grid fundamental wave synchronizing signal is obtained through a zero-cross detection circuit, an integrating circuit is input to generate a slope time-base signal, and the time-base signal is used for controlling the triggering moment of a high-frequency modulation pulse; the method comprises the following steps: modulating a pulse to intensively act on wave crest and wave trough areas of an AC voltage waveform, exciting an LC resonant circuit connected to a DC side of an electric energy conversion device by the modulating pulse to enable the LC resonant circuit to enter a quasi-resonant state in a phase interval, and actively releasing energy to a load by an energy storage capacitor; the system is controlled to be switched on preferentially, power supply competition for a main power supply is formed, main current output is correspondingly reduced on the premise that load power is not changed, energy conservation and consumption reduction are achieved, and the system further improves electric energy quality and operation stability through unified clock synchronization, phase out-of-sequence control, energy local circulation and impedance frequency band avoidance.

The application provides an in-situ detection method and system for acetylene in oil based on coated hollow core fiber enhancement, relates to the technical field of optical gas sensing, and specifically captures and enriches acetylene molecules from transformer oil flowing through a selective adsorption film modified on the inner wall of a coated hollow core fiber, so that the local concentration of the acetylene molecules in the coated hollow core fiber sensing probe detection is increased by tens of times, the enriched acetylene molecules are excited by high-frequency modulated mid-infrared pump laser, the periodic photothermal effect generated is sensitively detected by in-phase transmission near-infrared detection laser in the form of phase change, the super-high sensitivity detection can be maintained, the fast response meeting the early fault warning requirement is also satisfied, differential detection is simultaneously performed on the signal generation, temperature compensation, filter adjustment and frequency adjustment are simultaneously performed, the four-stage linkage processing mechanism is utilized to perform hierarchical processing on the signal, so that the whole system can not only resist wide temperature range and strong electromagnetic environment, but also adaptively resist time-varying field interference.

The application provides a high-speed polarization encoding device, method and quantum communication system, the device comprising: a polarization beam splitter, a transmission light path, a first phase modulator and a first high-speed driver; the first high-speed driver is connected with the first phase modulator, and is used for applying a high-frequency modulation signal with a frequency higher than a specified threshold to the first phase modulator; the polarization beam splitter receives an optical pulse through a first port, and splits the optical pulse into a first sub-optical pulse and a second sub-optical pulse; the first phase modulator is used for phase modulating the first sub-optical pulse and the second sub-optical pulse with different modulation efficiencies based on the high-frequency modulation signal; and the polarization beam splitter is further used for combining the first sub-optical pulse and the second sub-optical pulse after phase modulation by the first phase modulator, and outputting the obtained combined optical pulse through the first port. In this way, the purpose of high-stable polarization quantum state encoding of 10GHz or higher speed is achieved.

The invention discloses an annular micro-cavity quantum cascade laser. The laser comprises substrates which are sequentially arranged from bottom to top; the annular microcavity is arranged on the substrate, the annular microcavity is an elliptical resonator with a notch, and a groove is formed in the central area of the annular microcavity; the semi-insulating InP: Fe filling layer is arranged in the groove in the central area of the annular microcavity, and the difference between the resistivity of the semi-insulating InP: Fe filling layer and the refractive index of the upper cladding and the contact layer is less than 1%; the supporting ridges are arranged on the substrate, and the two supporting ridges are arranged on the two sides of the annular microcavity and are as high as the annular microcavity; the coplanar electrode comprises a central electrode arranged on the upper surface of the annular microcavity and grounding electrodes symmetrically arranged on the outer surface of the supporting ridge structure, and the central electrode and the grounding electrodes are the same in height. The quantum cascade laser has high-frequency modulation performance, improves heat dissipation performance, and has high response rate.

The application provides a weak ocean electric field measurement system with high Q quartz crystal oscillator frequency conversion resonance matching, which realizes high sensitivity and super high signal-to-noise ratio of seawater electric field measurement with small volume / interval. The application uses switch to alternately turn on and off metal mesh and shield cover, improves seawater electric field modulation frequency, realizes high Q resonance matching by parallel connection of multiple quartz crystal oscillators with the same characteristics, obtains passive amplification, greatly improves high-frequency modulation electric field amplitude and signal-to-noise ratio, so that the small volume / interval sensor can also obtain large electric field response. The electric field measurement method has the characteristics of small volume, high sensitivity and high signal-to-noise ratio, and can not only be flexibly arranged in various very weak electric field detection, but also can constitute a phased array electric field sensor to measure long-distance seawater electric field distribution, greatly expanding the field of ocean electric field measurement.

The application discloses a nano-channel transistor structure with an auxiliary anode and a driving method. The structure comprises an insulating substrate, a cathode, a gate and an anode which are made on the substrate, and at least one auxiliary anode is additionally arranged on the side of the anode away from the cathode. The auxiliary anode and the anode can have a height difference. By applying different direct-current voltages, a regulating electric field is formed between the anode and the auxiliary anode, the moving direction and speed of the electrons passing through the anode are changed, and the electrons are collected by the anode or directly collected by the auxiliary anode. The application also provides a corresponding driving method. The gate applies a direct-current bias voltage superimposed with a high-frequency modulation signal, and the anode and the auxiliary anode respectively apply direct-current voltages. The amplified high-frequency signals collected by the anode and / or the auxiliary anode are output through a capacitor, and the multi-output signals can be superimposed after the phase compensation system makes the phases of the multi-output signals consistent. The application effectively improves the utilization efficiency of the cathode emitted electrons and the total output current of the device.

The invention belongs to the technical field of illumination control, and particularly relates to a stroboflash-free eye-protection lamp based on high-frequency constant-current driving and a control method thereof, and the stroboflash-free eye-protection lamp comprises a power conversion module, a high-frequency constant-current driving module, a light source module, a current sampling module, a signal processing module and a feedback adjustment module. The power supply conversion module is used for accessing power frequency alternating current electric energy, rectifying and filtering the power frequency alternating current electric energy and outputting direct current basic voltage; and the high-frequency constant-current driving module is connected with the power supply conversion module and is used for receiving the direct-current basic voltage, converting the direct-current basic voltage into high-frequency pulse voltage and driving the light source module to work in a high-frequency modulation mode. According to the utility model, the visual comfort of the light source can be improved, the problem of low-frequency pulsation existing in a simple direct-current conversion circuit is effectively solved, it is ensured that no stroboscopic stripe appears in a fast moving sight line or a shooting scene, and the technical advantage and the practical value are remarkable.

The embodiment of the present application discloses a single-stage high-frequency modulation isolated power conversion circuit and a circuit control method, which are used in the technical field of power conversion. In the running moment of the power conversion circuit, the first ends of three groups of low-frequency bidirectional switches are respectively connected with different-phase input ends, and the second ends of the three groups of low-frequency bidirectional switches are connected with the direct-current level midpoints of a high-frequency bridge arm modulation module. In the running moment of the power conversion circuit, one-phase input end is communicated with the direct-current level midpoint of the high-frequency bridge arm modulation module by turning on one group of low-frequency bidirectional switches driven by low-frequency. The high-frequency bridge arm modulation module has two high-frequency bridge arm midpoints, and is used for high-frequency modulation of phase currents of a direct-current positive pole, the direct-current level midpoint and a direct-current negative pole of the high-frequency bridge arm modulation module, and outputs the high-frequency modulated currents through the two high-frequency bridge arm midpoints. By communicating one-phase input end with the direct-current level midpoint of the high-frequency bridge arm modulation module through the low-frequency bidirectional switch, the power conversion can be realized only by using a single-stage high-frequency bridge arm modulation module, and compared with high-frequency modulation of two-stage high-frequency switches, the high-frequency switch loss is effectively reduced, and the power conversion efficiency is improved.

The invention discloses a TDLAS (Tunable Diode Laser Absorption Spectroscopy) analyzer for H2O2 gas, and belongs to the technical field of gas concentration detection. In the H2O2 gas TDLAS analyzer, the inner surface of the gas path system in contact with H2O2 gas is subjected to inert treatment to form a chemical inert layer, so that the gas adsorption loss can be effectively inhibited; the optical path system is arranged in the heat preservation case, a stable physical environment is provided for TDLAS measurement, an instrument is almost not interfered by the field environment, and the long-term drift is extremely small; the laser driving module adopts a composite current source architecture and comprises an operational amplifier serving as an error amplification stage and a push-pull circuit serving as an output stage, so that the stability problem under high-current and high-frequency modulation is fundamentally solved, nearly ideal light source modulation signals are provided for TDLAS detection, and a basis is provided for high-precision harmonic detection. According to the invention, high-performance driving, enhanced protection and precise environment control are deeply coupled, and the precision, stability and reliability of H2O2 gas detection are effectively improved.

The invention relates to the field of fire monitoring and early warning, in particular to a TDLAS-based fire monitoring and early warning method, system and device and a medium. The method comprises the following steps: receiving an external modulation signal and inputting the external modulation signal into a high-frequency modulation circuit to obtain a converted current signal; controlling a laser to emit laser according to the current signal, projecting the laser to a photosensitive surface of a photoelectric detector after the laser passes through gas in a monitoring area, and converting a laser signal by the photoelectric detector to obtain a target digital signal; real-time processing is carried out based on the target digital signal, spectral analysis is carried out based on TDLAS, and the oxygen concentration and the gas temperature are obtained; whether the oxygen concentration and the gas temperature meet preset threshold values or not is judged, and if yes, the change trend of the oxygen concentration and the gas temperature is continuously monitored; and judging whether the change trend meets a preset change trend, and if so, executing an alarm operation. According to the invention, the limitation that the target gas needs to be adjusted for different scenes at present can be effectively avoided, and the universality of fire early warning is improved.

The invention discloses a remote sensing image semantic segmentation method based on multi-direction high-frequency modulation, and the method comprises the steps: dividing sample data into a training set and a test set, and carrying out the data preprocessing; constructing a remote sensing image semantic segmentation model based on multi-direction high-frequency modulation, wherein the model is composed of a dual-domain backbone network in which DWT participates, a contour sensing module of multi-direction high-frequency modulation and a self-adaptive channel-level refined reconstruction module; performing iterative training on the model based on a training set, and obtaining an optimal prediction model; and checking the segmentation effect of the prediction model based on the test set. According to the method, the capturing capability of a remote sensing image semantic segmentation model for inter-class feature differences is effectively improved, the similarity of intra-class features is enhanced, and then excellent semantic segmentation precision is obtained.

The invention provides a cascade system control method and a cascade system, the cascade system comprises a first inductor and N power modules (N is an integer greater than or equal to 2), each power module is provided with a first side and a second side, a branch formed by connecting the first sides of the N power modules in series bears a first voltage, and the second side of the N power modules bears a second voltage. The second side of each power module is subjected to a second voltage. Each power module includes a switch operating with a switching cycle. And determining the number of the power modules working in the high-frequency modulation mode according to the ratio of the first voltage to the second voltage, so that the moment when the current flowing through the switch is 0 exists in one switching period. The invention provides a soft switching solution, which can reduce the turn-on loss and is favorable for improving the power density of the cascade system. The condition that ZVS cannot be realized when the duty ratio is about 0 or 1 in a carrier cascading modulation means and the condition that ZVS cannot be realized due to ripple cancellation in a carrier phase-shifting modulation means can be avoided.

The invention discloses a wastewater separation and precipitation treatment device and method.The wastewater separation and precipitation treatment device comprises a precipitation tank and a controller, a resonance shell breaking cavity is vertically formed in the center of the interior of the precipitation tank, a vortex ring generation cavity is fixedly in butt joint with a bottom port of the resonance shell breaking cavity, and a vortex ring receiving assembly is fixedly arranged in the center of the bottom port of the vortex ring generation cavity; a cylindrical holographic field lens is integrated in the wall of the resonance shell breaking cavity, and a high-frequency modulation energy field generator is arranged at a top port of the resonance shell breaking cavity; the high-frequency modulation energy field generator is integrated with a phased array feedback system, a micro sensor network is further arranged in the resonance shell breaking cavity, and the micro sensor network is in communication connection with the phased array feedback system. According to the invention, the problem that the traditional physical separation technology cannot efficiently remove micro pollutants with similar density due to the dependence on the density difference of pollutants and water is solved.

The invention discloses a single-phase and three-phase continuous voltage regulation circuit based on series converter chains. The circuit comprises one or three series converter chains, a single-phase or three-phase industrial frequency transformer and a special energy supply connection mode between the series converter chains and the single-phase or three-phase industrial frequency transformer. The series converter chain is composed of N high-frequency modulation converters and n power frequency commutation converters, alternating current output ports of the converters are sequentially connected in series to form a voltage regulating port capable of continuously regulating voltage, and alternating current input ports of the converters are connected with a secondary winding of a power frequency transformer. And an energy supply input port formed by directly leading out the primary winding is connected with the voltage regulating port through a terminal to form a series connection structure. According to the invention, the limitation of step voltage regulation is eliminated fundamentally, continuous and rapid voltage regulation and partial power transmission are realized, the system loss and the device cost are reduced, the reactive power and harmonic compensation capability is realized, the expandability is good, and the system can be flexibly adapted to application scenes of different power levels through series-parallel connection combination.

The invention relates to a high-sensitivity streak camera ultrafast scanning image enhancement and noise reduction method, and belongs to the technical field of ultrafast imaging and signal processing. The method mainly comprises the following steps of: performing spatial modulation on three-dimensional image data coded by a spatial coding element through a periodic grating; carrying out compression imaging on the modulated three-dimensional image data by the streak camera to form a two-dimensional observation image; an ADMM-TV algorithm is adopted to carry out image decoding, and a three-dimensional image containing a periodic modulation structure is recovered; after the three-dimensional image is reconstructed, effective fringe information in the modulated image is further extracted, high-frequency modulation residues are removed, and denoising of the interference fringe image is achieved. Physical separation of signals and noise is achieved through periodic grating modulation, high-frequency interference such as space charge noise can be restrained, the signal-to-noise ratio and contrast ratio of images are improved, and accuracy and stability of diagnosis of an ultrafast imaging system of a VISAR speed interferometer are improved.

The application provides a high-speed intensity modulation device, method and quantum communication system. The device comprises an optical coupler, a transmission light path, a first phase modulator and a first high-speed driver. The first high-speed driver is connected with the first phase modulator and used for applying a high-frequency modulation signal with a frequency higher than a specified threshold to the first phase modulator. The optical coupler receives an optical pulse through an input port, splits the optical pulse into a first sub-optical pulse and a second sub-optical pulse. The first phase modulator is used for phase modulating the first sub-optical pulse and the second sub-optical pulse with different modulation efficiencies based on the high-frequency modulation signal. The optical coupler is further used for combining the first sub-optical pulse and the second sub-optical pulse after the first phase modulator, obtaining a combined optical pulse and outputting the combined optical pulse through an output port. In this way, the purpose of high-stable intensity modulation of a quantum light source with a speed of 10GHz or more is achieved.

The invention provides an open-circuit fault positioning method, which comprises the following steps of: providing a phase-locked signal source and a high-frequency signal source, and configuring the phase-locked signal source to output a low-frequency signal to a trigger end of the high-frequency signal source; modulating a high-frequency signal generated by the high-frequency signal source by using the low-frequency signal to form a high-frequency modulation signal, and outputting the high-frequency modulation signal to the tested sample to enable the open-circuit fault position of the tested sample to generate heat radiation; the infrared camera is used for detecting heat radiation generated by the detected sample so as to position the open-circuit fault position of the detected sample. According to the invention, the open-circuit fault can be quickly positioned, and the positioning success rate is improved.

This application discloses a visible light positioning and communication method, apparatus, and system, belonging to the field of visible light positioning and communication. It involves driving an LED lamp to emit a light signal with a preset modulation frequency. A receiving sensor receives the spectrum, extracts the chip's native blue light spectrum, and then decodes the spectral information carried by the spectrum based on the hardware parameters of the receiving sensor to obtain digital information. Positioning and communication are then performed based on this digital information. This application's solution completely eliminates physiological flicker perceptible to the human eye by employing high-frequency modulation at a preset frequency. Simultaneously, receiving only the native blue light spectrum effectively removes the afterglow effect of phosphors, ensuring clear high-frequency signals and significantly improving decoding success rate. Adaptive decoding, combined with the receiving sensor's hardware parameters, solves the frequency offset problem caused by hardware differences between different devices, enhancing cross-device compatibility. This achieves high-precision, high-reliability visible light positioning and communication, applicable to indoor navigation, communication, and other scenarios.

The invention provides an in-situ detection method and system for acetylene in oil based on film-coated hollow-core optical fiber enhancement, and relates to the technical field of optical gas sensing. Acetylene molecules are specifically captured and enriched from flowing transformer oil through a selective adsorption film modified on the inner wall of a film-coated hollow-core optical fiber; acetylene molecules are enriched, the local concentration of acetylene molecules detected by a coated hollow-core optical fiber sensing probe is increased by dozens of times, the enriched acetylene molecules are excited by intermediate infrared pumping laser modulated at high frequency, the generated periodic photothermal effect is sensitively detected by near-infrared detection laser transmitted in the same path in a phase change mode, ultrahigh-sensitivity detection can be kept, and the detection accuracy is improved. The system also meets the quick response required by the early warning of a fault, carries out the differential detection when a signal is generated, carries out the temperature compensation, filtering adjustment and frequency adjustment at the same time, and carries out the hierarchical processing of the signal through a four-stage linkage processing mechanism, thereby enabling the whole system to be capable of withstanding a wide temperature range and a strong electromagnetic environment, and also to be capable of achieving the high-precision detection. And time-varying field interference can be resisted in a self-adaptive manner.

The application discloses a video face replacement method and device and a storage medium, relates to the technical field of video face replacement, and comprises the following steps: acquiring an original video to be replaced and an appearance image of a target person, inputting the original video and the appearance image into a preset video face replacement model, and replacing a person in the original video with the target person, wherein the video face replacement model comprises a high-frequency refinement module, the high-frequency refinement module extracts high-frequency latent variables of the appearance image, modulates appearance features of the appearance image based on the high-frequency latent variables, obtains modulated appearance features after high-frequency modulation, and appearance of the target person in the target video is determined based on the modulated appearance features. By modulating the appearance features, the model can better learn high-frequency details in the high-frequency latent variables, so that high-frequency details of the person in the output target video are better depicted, and the realism of the generated face replacement video is improved.