1178 results about "Amplitude modulation" patented technology

The invention relates to the technical field of mechanical fault diagnosis, and discloses a gearbox fault diagnosis method and system based on lightweight variational Bayesian learning, and the method comprises the steps: collecting a to-be-diagnosed vibration signal of a gearbox, carrying out the preprocessing of the to-be-diagnosed vibration signal, and obtaining an original vibration signal and the fault feature frequency of the original vibration signal; determining amplitude modulation-frequency modulation sparse combination representation of the original vibration signal according to the fault characteristic frequency of the original vibration signal, and constructing a joint probability model according to classification distribution containing sparse vectors and the amplitude modulation-frequency modulation sparse combination representation of the original vibration signal; performing variational Bayesian inference solution on the joint probability model by using the non-overlapping sub-sequence of the original vibration signal and natural gradient optimization to obtain posterior probability estimation of a sparse coefficient; and determining an activation component according to the posterior probability estimation of the sparse coefficient and the sparse precision parameter, and matching the activation component with a pre-established multi-scale amplitude modulation-frequency modulation sparse dictionary to obtain a fault type and a confidence coefficient thereof.

The invention discloses a drip irrigation wheat water nitrogen intelligent monitoring system based on unmanned aerial vehicle multispectral inversion, and the system employs a multispectral sensor carried by an unmanned aerial vehicle to monitor the moisture and nitrogen content of wheat in real time, and employs a dynamic spectrum selection module to automatically select an optimal spectral band for data collection. Therefore, the most accurate crop state information can be obtained. The spectrum frequency conversion module and the adaptive spectrum amplitude modulation module in the system adjust the frequency and amplitude of spectrum data in real time, and further optimize the data quality and accuracy. Based on the high-quality data, a data analysis and decision support module generates an accurate intelligent irrigation and fertilization strategy, and water and nitrogen supply is automatically adjusted to meet the actual requirements of wheat in different growth stages, so that the growth conditions of crops are optimized, the growth quality and yield of wheat are remarkably improved, and the economic benefit is increased. Agricultural production is promoted to develop towards a more intelligent and precise direction, resource waste is reduced, and economic benefits are improved.

The invention provides a low-resolution scene deception jamming method for three-channel SAR-GMTI, and belongs to the technical field of radar countermeasure and artificial intelligence. The method comprises the following steps: constructing a deception scene template by utilizing an actually measured data imaging result; obtaining a low-resolution deception scene template through low-resolution processing; obtaining an interference amplitude gain parameter through a construction function and an optimization method; and carrying out amplitude modulation, phase modulation and time delay modulation on the intercepted radar signals in combination with the interference parameters, and then forwarding the signals, so as to generate a vivid false moving target detection result for radar detection. The objective of the invention is to generate a vivid false moving target by reducing the number of scattering points contained in a template and keeping a high correlation technique. Compared with an existing deception method, the method has the advantages that the generated signal is matched with the target signal in parameter, the number of scattering points contained in the false motion deception template is reduced, the calculation complexity can be greatly reduced, and a high-fidelity false motion target with an edge contour is generated.

The invention provides a full-space circularly polarized metasurface with identical amplitude modulation, and relates to the technical field of electromagnetic regulation and control of novel artificial electromagnetic materials. The metasurface comprises M * M metasurface units which are arranged in an array, wherein M is equal to 2, 3, 4,...; in the metasurface unit, a first metal layer comprises a first substructure and a second substructure; the first substructure is a gear and comprises four equidistantly distributed tooth roots, a pair of transverse tooth roots are equal in length, and a pair of longitudinal tooth roots are equal in length; a concentric ring is arranged in the gear ring of the first substructure; the second substructure is arranged in the concentric circular ring and comprises a double-E structure and a cross structure; openings of the double-E structure are opposite, the double-E structure is provided with two symmetry axes passing through the circle center of the gear ring, and the cross-shaped structure coincides with the two symmetry axes. The second metal layer is a metal plate etched with an annular metal groove; the first and third metal layers have the same structure. In the metasurface, a plurality of metasurface units with different polarization structures are designed, three independent functions can be realized, and the metasurface is rich in function, small in size, high in efficiency and high in integration degree.

The invention discloses a rapid assessment method and system for shock resistance toughness of main and aftershocks based on a cycle-Transform network, and the method comprises the steps: building a finite element model of a building structure, inputting a plurality of groups of earthquake accelerations of main and aftershocks into the model, and obtaining a database comprising a plurality of groups of accelerations and corresponding structure displacement responses; building a loop-Transform neural network, and carrying out the training and optimization of the loop-Transform neural network; inputting the main shock and aftershock sequence into the optimized cycle-Transform neural network, predicting the displacement response of the structure under the double amplitude modulation main shock and aftershock sequence, then obtaining the building damage probability corresponding to different earthquake intensities under the main shock and aftershock situation by using maximum likelihood estimation, evaluating the corresponding damage index, calculating the recovery time, and finally obtaining the building damage probability corresponding to the different earthquake intensities under the main shock and aftershock situation. A function recovery curve of the structure is predicted, and shock resistance toughness evaluation is completed. According to the method, the precision of structure accumulated damage prediction under the aftershock effect is improved, and the calculation complexity and time consumption of toughness evaluation under the main and aftershock earthquake scene are remarkably reduced.

The invention discloses a simulation test system and method suitable for a radiation type semi-physical radar. The system comprises a semi-physical radar; the three-axis turntable is configured to complete radar antenna motion attitude simulation; the scene visualization and simulation control computer is configured to complete scene planning, deduce a simulation process, distribute a scene situation and calculate target space data; the radar echo simulator is configured to perform time delay, Doppler frequency shift and amplitude modulation on a radar emission radio frequency signal through the FPGA and output a target echo simulation radio frequency signal; the antenna array and feed subsystem performs rough simulation and accurate simulation of a target position, converts a target echo radio frequency signal into an electromagnetic signal and radiates the electromagnetic signal to the space; the test evaluation computer is configured to calculate and display an evaluation index. According to the invention, a real radar is connected to a simulation closed loop, and a plurality of targets and movement thereof can be simulated for the radar according to scene driving, so that the semi-physical radar is fully simulated and tested.

The invention discloses an optical memristor, and relates to the field of photon integrated circuits and optical computing, and the optical memristor comprises a waveguide layer, a ferroelectric film layer, an electrode structure and a substrate. The ferroelectric film layer is located on the upper surface of the substrate; the waveguide layer and the electrode structure are located on the upper surface of the ferroelectric film layer; the waveguide layer is used for propagating an incident light signal and performing amplitude modulation on the incident light signal; the electrode structure is used for applying an electric field to the ferroelectric film layer; and the ferroelectric film layer is used for carrying out phase modulation on optical signals transmitted in the waveguide layer under the action of the electric field. The ferroelectric material is used as the optical switch of the optical memristor, efficient modulation of the optical phase is achieved through the non-volatility and the high electro-optical effect of the ferroelectric material, and meanwhile the optical memristor has the advantages of being low in energy consumption and rapid in response.

The invention discloses an ultra-low phase noise microwave signal generation method and system based on an electro-optical comb. The method comprises the following steps: 1) locking two lasers with continuously tunable wavelengths in the same FP cavity through two links with different modulation frequencies to realize a dual-wavelength laser with a frequency interval of (v2-v1); 2) reducing the electronic noise of each link to a quantum noise limit by using a residual amplitude modulation noise control technology; 3) coupling the lasers with the center frequencies of v1 and v2 into one path, inputting the laser into an electro-optical frequency comb generator, and generating two sets of electro-optical frequency combs with spectrum overlapping; (4) beat frequency signals of the two electro-optical frequency combs are obtained; the beat frequency signal and a reference signal from a reference signal source are accessed to a phase discriminator for phase discrimination; an output signal of the phase discriminator is sent to a proportional-integral-differential control circuit; and 5) controlling the phase noise of the radio frequency source by using the output feedback of the proportional-integral-differential control circuit to obtain an ultra-low phase noise microwave signal.

The invention discloses a multi-scattering SAR (Synthetic Aperture Radar) imaging simulation method, system and device based on physical consistency modeling and a medium. The method comprises the following steps: constructing a three-dimensional electromagnetic model of a target; constructing a geometric model under the working mode of the ray tracing auxiliary transmitting-receiving co-located SAR; a high-frequency electromagnetic scattering algorithm based on ray tracing is adopted, multiple scattering paths of a first order, a second order and a higher order are considered, superposition and amplitude modulation are carried out on scattering contributions of all orders, scattering field distribution of a target under the far field condition is calculated, and a far-field scattering field is obtained; performing spatial propagation mapping on the total far-field scattering field, and mapping a far-field scattering result into a radar platform near-field echo signal; correcting the amplitude of the echo signal to obtain a two-dimensional SAR near-field echo matrix; sAR imaging processing is carried out, wherein the SAR imaging processing comprises distance compression, range migration correction (RCMC) and azimuth compression. According to the invention, the authenticity and precision of SAR imaging simulation in a complex target scene are improved.

This disclosure describes systems, methods, and devices for probabilistic constellation shaping in wireless transmissions may include a device configured to generate, using a first quadrature amplitude modulation (QAM) order shaping encoder associated with a first code rate, shaped amplitude bits; generate, using a forward error correcting (FEC) encoder and a second code rate smaller than the first code rate, parity bits for the shaped amplitude bits; cause to transmit, using a channel, a first portion of the parity bits as sign bits for the shaped amplitude bits; and cause to transmit, using the channel, a second portion of the parity bits.

The invention provides a code modulation method and device, electronic equipment, a storage medium and a program product. The method comprises the following steps: probability constellation shaping coding is carried out on a payload bit data stream to be sent to obtain a bit data stream after shaping coding, and the bit data stream after shaping coding comprises non-equal-probability amplitude bits corresponding to orthogonal amplitude modulation constellation points and a part of equal-probability symbol bits; the bit data stream after shaping coding is recombined and adapted to be in a frame format corresponding to error correction coding, forward error correction coding is carried out, an error correction code bit data stream is obtained, and the error correction code bit data stream comprises non-equal-probability amplitude bits corresponding to orthogonal amplitude modulation constellation points and equal-probability symbol bits; and recombining and adapting the error correction code bit data stream into a frame format corresponding to quadrature amplitude modulation, and mapping into a plurality of modulation constellation points according to a quadrature amplitude modulation constellation diagram. The signal-to-noise ratio is improved, and the communication performance and the transmission stability are improved.

The invention discloses a servo motor casing structure convenient for heat dissipation, which belongs to the technical field of motors and comprises a casing, end covers are detachably mounted at two ends of the casing respectively, a plurality of heat dissipation fins are distributed on the side wall of the casing, and two independent cooling channels are arranged in the inner wall of the casing; the oil cooling channel is composed of a plurality of wide channels which are circumferentially distributed at equal intervals, and the water cooling channel is composed of a plurality of gap channels which are circumferentially distributed at equal intervals; the two ends of the machine shell axially and symmetrically extend to form inner protruding edges, and the oil cooling channels are distributed in the inner protruding edges in a penetrating mode. An oil inlet ring and an oil discharge ring are symmetrically arranged on the machine shell, are both distributed between the machine shell and the end cover, and are respectively communicated with two sides of the oil cooling channel; amplitude modulation units are slidably arranged at the positions, located on the peripheries of the inner protruding edges, of the machine shell, and the two amplitude modulation units can be matched to adjust the effective circulation length of each gap channel in the water cooling channel; the oil cooling channels and the water cooling channels are arranged correspondingly, so that the heat dissipation effect of the case is improved.

The invention relates to a display device. The display device comprises a light-emitting device and a pixel circuit. The pixel circuit comprises an amplitude modulation module, a pulse width modulation module and a switch module. A first capacitor in the pulse width modulation module is used for storing a first electric charge quantity corresponding to a pulse width data signal received by the pulse width modulation module. And a second capacitor in the amplitude modulation module is used for storing a second electric charge quantity corresponding to the amplitude data signal received by the driving unit. A connection node of the first capacitor and the driving unit is a first node, a connection node of the second capacitor and the pulse width control unit is a second node, and the switch module is connected between the first node and the second node and used for conducting the first node and the second node before a reset stage so as to neutralize charges stored in the first capacitor and the second capacitor. Therefore, the voltage of the first node is reduced, the influence on the reset signal is reduced, the problem that the light-emitting device emits light abnormally in the reset stage is solved, and the display effect of the display device is improved.

The present invention discloses an unified multiple access (MA) based system for uplink transmission of data by multiple users. The system comprises an user interface integrated transmitter modules for transmitting the data from multiple user transmitters over waveforms through a cooperative unified data grid structure including grid points, said unified data grid structure including each user transmitter allocation of a few non-overlapping grid points for loading respective data bearing symbols, with zeros loaded onto unallocated grid points. The user transmitter is configured to transmit a sparsely loaded grid resembling to the unified two-dimensional data grid structure involving data-bearing Quadrature Amplitude Modulation (QAM), where a part of available grid points of the grid as allocated is loaded with QAM symbols and remaining grid points are loaded with zero symbols. A waveform modulator corresponding to user transmitter is also provided in the present system for waveform modulation of said sparsely loaded grid as per the waveforms enabling transmission for multi-antenna reception of the waveforms to a base station or an access point.

The invention discloses a simple receiving multiple access method based on joint allocation of symbols and bit streams. The method comprises the following steps: firstly, allocating the symbol streams and the bit streams of all users by a transmitter based on a layered orthogonal amplitude modulation constellation diagram; different interference management schemes are adopted for inter-user interference in different beams and inter-user interference in the same beam, so that the influence of the inter-user interference on the system performance is suppressed; and performing channel equalization processing on signals received by each user receiver, calculating the log-likelihood ratio of each bit stream allocated to each user by each user according to a bit stream allocation result, and sending a calculation result to a channel decoder to obtain original bit data. According to the method, each user symbol and bit stream allocation scheme and constellation diagram design are jointly optimized, and efficient user access in a large-scale access scene can be realized under the condition of meeting the signal processing complexity constraint condition of a receiver.

The invention relates to the technical field of gear detection, in particular to a gear wear detection method and system of a gear motor. According to the method, firstly, all fault characteristic frequencies are obtained based on historical vibration signals of a fault gear, then vibration signals of a to-be-detected gear are divided into a plurality of local impact sub-segments, and the local frequency spectrum of each local impact sub-segment and the kurtosis of each frequency in the local frequency spectrum are obtained; fitting a fuzzy estimation signal of the vibration signal in combination with power distribution under each fault characteristic frequency in the time-frequency spectrum, and then modulating the vibration signal in combination with a motor load condition; and finally analyzing a frequency spectrum signal of the modulation vibration signal, and evaluating the early wear type of the gear to be detected. According to the method, the vibration signal is modulated by analyzing the covering interference of noise and motor load on local wear impact, and the frequency modulation effect and the amplitude modulation effect are further analyzed in the frequency domain of the modulated vibration signal, so that the early wear type is accurately distinguished, and the gear wear detection effect is improved.

The invention discloses an anti-interference laser radar based on quantum noise and a ranging method, and belongs to the technical field of laser radars. Coherent state optical signals generated by a laser are split into signal light and local oscillation light through a beam splitter; random phase modulation is carried out on the signal light according to the true random number sequence, so that the phase difference between adjacent signal light is smaller than the vacuum shot noise; the signal light subjected to random phase modulation irradiates a target object after being expanded by the transmitting telescope, and echo signal light is formed after being reflected and enters the receiving telescope; performing coherent detection on the echo signal light by using a coherent detection module and local oscillation light, and generating initial data by collecting an output electric signal; and carrying out phase calculation on the initial data, generating demodulation data, and carrying out shift cross-correlation operation on the demodulation data and the true random number sequence to obtain a target distance. Only random phase modulation is needed, random amplitude modulation is not needed, an amplitude modulator is omitted, and the cost and complexity of the system are reduced.

Provided are a communication method and a communication device, the method comprising: determining a transmission waveform of a signal, the transmission waveform being related to a threshold of a first parameter, the first parameter comprising: a modulation order and a roll-off factor, the transmission waveform is an orthogonal frequency division multiplexing QAM-DFTS-OFDM waveform of discrete Fourier transform spread spectrum of orthogonal amplitude modulation or an orthogonal frequency division multiplexing OQAM-DFTS-OFDM waveform of discrete Fourier transform spread spectrum of offset orthogonal amplitude modulation, and the roll-off factor is determined based on the transmission bandwidth and the number of symbols carried by the transmission waveform. And transmitting or acquiring the signal. In the method provided by the invention, the network equipment or the terminal equipment can determine the transmission waveform of the signal according to the set threshold value of the modulation order and the threshold value of the roll-off factor, so that the output power supporting higher power amplifiers can be obtained, and a larger signal coverage range can be obtained.

The invention discloses a device and a method for manufacturing a laser three-dimensional body with a complex structure, and solves the problems of low processing precision and low processing efficiency of the existing femtosecond laser processing technology. The light beam position presetting unit, the dispersion compensation unit, the acousto-optic modulation unit, the optical relay compensation unit and the microscopic focusing unit are sequentially arranged on a light path where the processing laser is located in the emitting direction of the processing laser. The light beam position presetting unit is used for adjusting the optical axis space position of the processing laser; the dispersion compensation unit is used for performing dispersion compensation on the processing laser after the optical axis spatial position adjustment; the acousto-optic modulation unit is used for dividing the processing laser subjected to dispersion compensation into a plurality of sub-beams through amplitude modulation of electric signals with different and / or the same frequency, and adjusting the spatial position of each sub-beam; the optical relay compensation unit is used for adjusting the optical path of each sub-beam; and the microscopic focusing unit is used for focusing the sub-beams after the optical path adjustment.

The terahertz metasurface device comprises a top metal structure layer, a middle flexible polyimide dielectric layer and a bottom metal plate layer which are sequentially arranged from top to bottom, and the top metal structure layer, the middle flexible polyimide dielectric layer and the bottom metal plate layer form a Fabry-Perot resonant cavity. The amplitude and the phase can be regulated and controlled at the same time only by rotating the top layer metal structure of the sub-wavelength unit structure, the problems of large size, low precision and the like of an Airy beam generation device are effectively solved, and therefore flexible regulation and control of broadband (0.95-1.8 THz) one-dimensional and two-dimensional Airy beams in the terahertz wave band are achieved. And the possibility is developed for the application in high-capacity and obstacle-avoiding wireless communication.

The invention relates to a method and a system for realizing fast and uniform focusing of emergent light spots of a multi-mode optical fiber based on superpixels, belongs to the technical field of novel optical imaging and light field regulation and control, and integrates online speckle acquisition, offline amplitude optimization and an online speckle acquisition stage. When a certain modulation area is in an activated state, respectively capturing a non-interference speckle image of the emergent end of the multimode optical fiber and an interference speckle image generated when the area and the reference area are activated at the same time, and traversing all the modulation areas to totally obtain a speckle image; in the off-line amplitude optimization stage, a focusing light spot is preset, and calculation is carried out by utilizing intensity information of a corresponding focusing position in the speckle image. And analyzing all the focusing light spots one by one so as to construct a binary amplitude modulation mask. And the masks are loaded to the spatial light modulator one by one, so that accurate point-by-point focusing of N emergent light spots of the multimode optical fiber is realized, and the focusing efficiency and uniformity are greatly improved.

An aerosol provision device or a vapor provision device including an aerosol generator or vapor generator; a driving circuit connected to the aerosol generator or vapor generator, wherein the driving circuit is configured to employ either pulse width modulation or amplitude modulation, to supply power to the aerosol generator or vapor generator; and a power source connected to the driving circuit, wherein the power source includes a hybrid ion capacitor.

The invention provides a short-distance high-speed optical fiber communication equalization method and system, and the method comprises the steps: building a Gaussian mixture model for an optical signal subjected to the quadrature amplitude modulation of a set order, and completing the parameter initialization of the Gaussian mixture model through a particle swarm optimization algorithm of which the inertia weight is firstly increased and then decreased; the method comprises the following steps: inputting data features of two dimensions of an in-phase component and an orthogonal component of data into a Gaussian mixture model, then solving parameters of the Gaussian mixture model by using an expectation maximization algorithm, and determining the membership degree of each data point and a clustering label corresponding to each unary Gaussian distribution through the parameters; and through the maximum posterior probability, the data are distributed to the corresponding clustering labels, and nonlinear equalization is completed. According to the method, the memory property of signal nonlinear impairment can be accurately captured, the nonlinear clustering precision is improved, and the calculation complexity of a nonlinear clustering model is reduced under the same clustering effect.

The invention provides an LED light source control method, device and equipment and a storage medium, and the method comprises the steps: collecting the temperature data of an LED light source module, carrying out the sliding window filtering processing, obtaining a temperature change curve, and calculating a temperature compensation control signal through combining a working current and a temperature-light intensity characteristic curve; dividing the detection period into a plurality of time slices, and performing frequency and amplitude modulation to obtain a composite pulse sequence; calculating surface shadow area distribution according to the three-dimensional contour data of the to-be-measured object, dividing the LED light source module into a main light source group and a supplementary light source group, and generating a time sequence interleaving control signal; controlling the two groups of light sources to alternately illuminate and collecting light intensity distribution data in the detection process; and performing deviation analysis on the light intensity distribution data to generate a compensation signal, and feeding back and updating a temperature compensation control signal. According to the scheme, through prediction compensation and an alternating illumination mechanism, the temperature drift influence of the LED light source is reduced, the response delay of feedback control is reduced, the stability of light intensity is improved, and the accuracy of a detection result is ensured.

The invention discloses a three-degree-of-freedom ultrasonic motor driving control method. A three-degree-of-freedom ultrasonic motor comprises a signal generation module, a key control module, a power amplification module, a communication module, a grating ruler analysis module, a control algorithm, a data processing module, a power amplification circuit, a matching circuit and a voltage and current sampling circuit. The signal generation module outputs six paths of PWM waves with adjustable frequencies, phases and duty ratios, the control algorithm module performs adjustment through a control algorithm according to operation parameters of an ultrasonic motor fed back by a grating ruler, the key module is used for manual control, and the communication module is composed of USART logic and DMA logic. A control algorithm and data processing are generated by a single-chip microcomputer, detection and servo control are carried out through a communication USART module, and real-time monitoring, power amplification and matching are carried out on a serial port assistant of an upper computer, and a voltage and current sampling circuit drives and stabilizes operation of the ultrasonic motor. According to the invention, the amplitude modulation precision is below 4mv, and the stability is higher through a closed-loop control algorithm.

The invention discloses a diamond low-frequency current measurement method with nonlinear response to magnetic field intensity, which is characterized in that two coils are wound on a magnetic flux collector with a communicated structure, a high-frequency (800Hz) high-voltage (7V) driving current is injected into one of the coils, a magnetic field generated by the coil is amplified through the magnetic flux collector and guided to an area where an NV color center magnetometer is located, and the NV color center magnetometer is located; and the signal is driven to enter a nonlinear response interval in the demodulated ODMR spectrum. A weak (1-50mV) to-be-measured low-frequency (0.1-10Hz) current signal is injected into the other coil, amplitude modulation is performed on the weak (1-50mV) to-be-measured low-frequency (0.1-10Hz) current signal by using the same frequency as the driving current, and the weak (1-50mV) to-be-measured low-frequency (0.1-10Hz) current signal is amplified by the magnetic flux collector and guided to the NV The microwave frequency is locked at the maximum slope point of the ODMR frequency spectrum through CW-ODMR phase-locked amplification, so that the relationship between the change of the red fluorescence signal intensity and the size of the external magnetic field is obtained, and the signal intensity of the low-frequency current magnetic field to be measured is measured according to the relationship.

The invention discloses a tower positioning system and method for a Brillouin optical time domain analyzer based on differential pulses, and relates to the technical field of optics. The system comprises a data acquisition module and a data processing module. Wherein the data acquisition module is used for acquiring a Brillouin time domain signal returned by an optical fiber to be detected, and the data acquisition module comprises a pump light modulation sub-module, a probe light modulation sub-module and a data acquisition card; the pump light modulation sub-module is used for carrying out pulse width and amplitude modulation on the pump light and coupling the modulated light pulse into an optical fiber to be measured; the detection light modulation sub-module is used for performing frequency modulation on the detection light intensity and coupling the reference light after frequency modulation into the optical fiber to be detected from the other end; the data acquisition card is used for acquiring a Brillouin time domain signal; and the data processing module is used for processing the Brillouin time domain signal to obtain a straight line tower position between the two welding points. The method has high precision and high sensitivity, and can improve the positioning accuracy and reliability of the tower.

The invention provides an amplitude-frequency modulation signal decomposition method and device, and relates to the technical field of electric power. The method comprises the following steps: acquiring an amplitude modulation signal and a frequency modulation signal; decomposing the amplitude modulation signal to obtain a first decomposition result of the two-phase voltage under a two-phase rotating coordinate system; decomposing the frequency modulation signal to obtain a second decomposition result of the two-phase voltage under the two-phase rotating coordinate system; and synthesizing the first decomposition result and the second decomposition result to obtain an amplitude-frequency modulation signal decomposition result of the two-phase voltage under the action of an amplitude and frequency common modulation signal in a two-phase rotating coordinate system. The device executes the method. According to the amplitude-frequency modulation signal decomposition method and device provided by the embodiment of the invention, the oscillation component information can be completely reserved through amplitude-frequency modulation signal decomposition, so that the oscillation frequency information can be accurately obtained.

The invention discloses an intermediate frequency electro-therapeutic apparatus, which comprises a controller and a waveform synthesis circuit, and is characterized in that the waveform synthesis circuit comprises a first amplitude adjusting circuit, a second amplitude adjusting circuit and a synthesis adjusting circuit, and the controller generates a first PWM signal according to the overall amplitude information; the first amplitude adjusting circuit performs amplitude modulation processing on an input original waveform according to the first PWM signal to generate a first analog waveform signal; the controller obtains amplitude information corresponding to the frequency of the modulation waveform by using the phase accumulator, and generates a second PWM signal; a second amplitude adjusting circuit performs multiplication operation on the second PWM signal and the first analog waveform signal to obtain a second analog waveform signal and obtain an inverted waveform signal; the controller obtains amplitude information corresponding to the frequency of the fundamental frequency waveform by using a phase accumulator, and generates a third PWM signal; and the synthesis adjusting circuit performs multiplication operation on the third PWM signal and the second analog waveform signal or the inverted waveform signal to generate an intermediate frequency treatment waveform.

The invention discloses an ODAC implementation system and method based on a five-segment thermo-optical phase modulator, and relates to the technical field of optical communication, and the method comprises the following steps: obtaining single-mode laser input, dividing the single-mode laser input into two paths through a multi-mode interference device beam splitter, and transmitting the single-mode laser input into an upper arm and a lower arm of a Mach-Zehnder modulator; the current is adjusted through the thermo-optic phase modulator to control the temperature, the refractive index is changed to introduce phase delay, and the phase difference of two arms of the Mach-Zehnder modulator is calibrated; on the basis of a five-segment thermo-optical modulator, hierarchical amplitude modulation is carried out on beam splitting light according to digital input, a phase space is constructed by utilizing weight combination, and a linear optimal discrete state is screened; the modulated light is combined by a multi-mode interference device beam combiner, and digital-analog mapping output of light intensity is carried out; a detector installed at an output port of the five-segment thermo-optical phase modulator is used for monitoring output optical power in real time, the output optical power is fed back to a control circuit to calculate errors, thermo-optical modulation current is dynamically adjusted to compensate offset point drift, and optical digital analog conversion is achieved.