240 results about "Carrier modulation" patented technology

The invention discloses an earthquake early warning device and method based on campus broadcast, and the method comprises the steps: carrying out the building response coupling analysis through receiving an early warning signal of an earthquake monitoring center, generating an earthquake magnitude-building coupling feature, and mapping the earthquake magnitude-building coupling feature into an enhanced early warning source adaptive to an acoustic environment; acoustic cavity detection is carried out based on threatened area identification, and differential playing topology is constructed; extracting a high-risk gathering area through personnel density scanning, generating personalized evacuation guiding content and determining a playing priority; high-precision time sequence control is realized by adopting a synchronous reference anchor point technology, and a multi-mode playing domain is constructed through carrier modulation and frequency division multiplexing; and finally, an acoustic navigation field is utilized to guide accurate scheduling and playing of audio signals, differential playing and accurate coverage of early warning information can be realized according to the anti-seismic characteristics and acoustic environment characteristics of different buildings, and an intelligent acoustic solution is provided for campus earthquake early warning.

The invention provides a permanent magnet frequency conversion double-sine modulation swimming pool pump energy-saving control method, and relates to the technical field of motor driving and control, and the method comprises the steps: building a double-sine carrier modulation model of a permanent magnet synchronous motor, and calculating a dynamic harmonic suppression factor and a double-sine modulation depth in real time; feedforward compensation is carried out on the inverter current based on the DHSIF, and a q-axis current reference value is generated by adopting double-closed-loop vector control; dynamically adjusting a carrier frequency range according to the DSMD, generating double sine carriers with a phase difference of pi / 3, and superposing the double sine carriers into a composite modulated wave; the modulation wave amplitude is corrected through a DHSIF, and fifth and seventh harmonics are eliminated in combination with an adaptive filtering algorithm; a carrier wave ratio is dynamically optimized to generate a PWM signal, and a transient compensation mechanism is triggered to correct a voltage instruction when a load suddenly changes; and an energy efficiency optimization database is constructed to call historical optimal parameters, and nonlinear mapping of DHSIF and motor characteristics is established through parameter self-tuning. According to the invention, cooperative control is realized through dynamic harmonic suppression, modulation depth optimization and intelligent thermal protection.

The invention provides a carrier modulation method and modulation-demodulation system for an MMC circulation suppressor, and the method comprises the following steps: obtaining MMC operation log data, carrying out the spectrum analysis, and extracting the spectrum amplitude distribution characteristics; identifying a bridge arm circulation condition based on the amplitude distribution characteristics, and further detecting bridge arm load abnormity and unit energy abnormity conditions; identifying a circulating current frequency component according to an energy abnormal condition, performing electric energy quality attenuation detection and initial circulating current position tracing, and determining a circulating current generation mechanism; and finally, based on the risk assessment result and the generation mechanism data, constructing a modulation parameter, and generating an adaptive circulation suppressor carrier modulation strategy. Compared with the prior art, the method has the following beneficial effects: through modulation of the circulating current suppressor, modulation of the circulating current suppressor is more accurate, so that the problems of inaccurate analysis of a bridge arm circulating current generation mechanism and inaccurate analysis of an energy abnormal condition of the MMC unit existing in carrier modulation of a traditional circulating current suppressor are solved.

The invention belongs to the field of power electronic converter control and design, and discloses a carrier modulation method and system for achieving accurate control over the neutral-point potential of a three-level inverter. The neutral-point voltage is kept in a relatively balanced state by detecting and correcting the voltage difference of an upper capacitor and a lower capacitor on the direct current side in time; and the distortion of the output voltage at the alternating current side caused by large fluctuation of the neutral-point potential is reduced or avoided. A midpoint potential correction link is introduced while the advantages of a conventional SVM or carrier modulation are not damaged; and when the neutral-point potential deviates, the zero-sequence voltage is automatically injected or a proper switching vector sequence is selected to compensate, suppress harmonic waves and reduce the distortion degree, so that the waveform quality of the output voltage is improved.

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

The invention relates to the technical field of artificial intelligence, and provides a network intrusion detection method based on multidimensional feature collaborative analysis, and the method comprises the steps: calculating the correlation degree eta ij of any two feature columns in an original traffic feature matrix, and when eta ij is greater than eta thr, generating a new feature through Qij = Xi * Xj + (1-eta ij) * (Xi + Xj), outputting a dimension reduction feature matrix to perform nonlinear spatial transformation on the dimension reduction feature matrix X ', dynamically retrieving associated knowledge through a learnable memory library, fusing current input features and memory enhancement features, and outputting refined features; decomposing the refined features to a biological neural oscillation frequency band, applying carrier modulation, and performing feature reconstruction to generate a space-time correlation tensor; the refined features and the space-time correlation tensor are fused, and the intrusion behavior classification probability is output through multi-stage abstract compression and regularization processing; screening difficult samples based on classification confidence to construct a training library, and obtaining a conventional detection model and a special and precise detection model; and preferentially calling the special and precise model during real-time detection, and switching to the conventional model when the confidence coefficient is smaller than a confidence coefficient threshold value.

The invention discloses a multi-time slot MAMP receiver and coding method for an MIMO multicarrier modulation system, comprising a time domain linear estimation module gamma l (.) and a symbol domain nonlinear estimation module phi l (.), where l represents the number of iterations; the time domain linear estimation module adopts a matched filter to recover the received time domain signal to obtain an estimated value of the time domain signal; transforming the estimated value into a symbol domain through unitary transformation; and the symbol domain nonlinear estimation module calculates a log-likelihood ratio of each symbol and calculates an estimated value of each symbol through estimation of the symbol domain returned by the time domain linear estimation module. According to the method, the optimal MSE detection performance can be realized with extremely low complexity in a multi-time-slot transmission scene.

The present invention relates to the technical field of carrier modulation, and discloses an intelligent DC dimming control method and system for hybrid carrier modulation, including: generating a multi-segment photometric mapping relationship according to historical photometric data, and calculating a target brightness corresponding to target light intensity data; determining a brightness adjustment intention corresponding to a brightness adjustment signal, and identifying a dimming scenario of a target area according to the brightness adjustment intention; analyzing modulation parameters corresponding to the brightness adjustment intention by using a hybrid carrier modulation scenario mode, and performing modulation analysis on a dimming device in the target area according to the modulation parameters to obtain a modulation signal; determining modulation DC data of the target area according to the modulation signal, calculating an adjustment amount corresponding to the dimming device by using the modulation DC data, and generating dual dimming curve parameters of the target area according to the adjustment amount; superimposing the dual dimming curve parameters to obtain a superimposed dimming curve, and analyzing a dimming control state according to the superimposed dimming curve. The present invention can improve the accuracy during intelligent dimming control.

The invention provides a multi-carrier modulation-based common-inductance integrated waveform design method and system, and belongs to the technical field of multi-carrier communication. The method comprises the following steps: constructing a mapping relationship between different service types and waveform parameters; determining a waveform parameter of the subcarrier according to the current service type and the performance index requirement corresponding to the service type, and adjusting the waveform parameter; determining the total number of subcarriers according to the network mode and the service type; performing state detection on the communication channel by taking the total number of the subcarriers as the maximum number of the subcarriers so as to adjust waveform parameters of the subcarriers; and based on the adjusted waveform parameters of the subcarriers, synthesizing a flux-inductance integrated waveform. According to the invention, analysis of communication and sensing tasks can be carried out at the same time based on the same hardware, and dynamic adjustment of subcarrier related parameters and number is realized so as to meet the requirements of different application scenarios on transmission waveforms.

The invention discloses a capacity-expanding anti-interference measurement and control communication method, which comprises the following steps of: 1, generating M alternative spread spectrum sequences; step 2, the transmitting end performs parallel combined spread spectrum, including parallel transmission, spread spectrum superposition and carrier modulation; wherein during spectrum spreading, in I and Q, any one alternative spectrum spreading sequence in one path is selected as a synchronization sequence, and all the remaining alternative spectrum spreading sequences are subjected to combined spectrum spreading; step 3, blind interference signal separation at a receiving end: at the receiving end, firstly carrying out carrier demodulation on all interference signals and measurement and control signals received by the array antenna, and then carrying out blind interference signal separation on observation signals after carrier demodulation to obtain separated expansion anti-interference measurement and control signals; and finally, recovering the expanded anti-interference measurement and control signal to obtain recovered data. According to the invention, parallel combination spread spectrum and blind interference signal separation processing are organically combined, so that the anti-interference capability of the measurement and control system can be ensured while the system capacity is improved.

The invention specifically discloses an ultrasonic guided wave edge real-time communication method and system based on an FPGA (Field Programmable Gate Array), and the method comprises the following steps: the FPGA of a guided wave communication transmitting circuit receives data needing to be transmitted, completes the data package construction and carrier modulation, and outputs a digital signal; after digital-to-analog conversion, a multi-stage power amplification circuit and a matching network circuit, the ultrasonic guided waves are transmitted to an excitation piezoelectric transducer, and the excitation piezoelectric transducer generates ultrasonic guided waves to be transmitted in a metal medium; the receiving piezoelectric transducer converts ultrasonic guided waves transmitted in a metal medium into piezoelectric signals, the piezoelectric signals sequentially pass through the active filter circuit, the variable gain amplification circuit and the analog-to-digital conversion circuit and are transmitted to the FPGA of the guided wave communication receiving circuit in the form of digital quantity, and the FPGA operates a demodulation algorithm to restore effective binary data. And the data is transmitted to other equipment. According to the technical scheme, the FPGA serves as a processing unit, high-frequency carrier modulation and real-time operation of a complex demodulation algorithm can be completed, and the high-speed communication requirement can be met.

The invention provides a satellite internet rapid high-precision navigation positioning method, a transmitting end modulates a navigation message and broadcasts the navigation message through a satellite internet frequency band, the advantage of satellite internet multi-carrier modulation is utilized, an I branch of QPSK is adopted for rapid parallel broadcasting, and the satellite internet multi-carrier modulation speed is improved. Basic navigation positioning parameters obtained for the first time are improved from the second level to the millisecond level of single-wave-position residence; a receiving end demodulates a received signal to obtain a navigation message, QPSK modulation is adopted, phase division is carried out on a Q branch supporting high-precision measurement and an I branch of the modulated message, and the Q branch is used for high-precision frequency offset estimation and time delay estimation; and the branch I carries out rapid navigation message broadcasting, so that high-precision frequency and time delay measurement is realized, and rapid message broadcasting is also realized.

The invention relates to the technical field of intelligent conference systems, and discloses a debugging-free audio and video fusion management and control system and method, and the method comprises the steps: carrying out the reverse deduction of a communication protocol of audio and video equipment through analyzing the rising edge features of an electrical signal and a radio frequency carrier modulation mode, and dynamically updating an adaptive rule library; the multi-modal scene perception engine fuses audio stream, video stream and environment stream data, and generates an adaptive scene strategy based on a multi-head attention mechanism; the credible recording enhancement system automatically binds the identity of a spokesman through a voiceprint clustering algorithm, and carries out block chain storage on recording contents according to speaking segments, so that plug and play of multi-brand wired / wireless equipment is realized, and different communication protocols can be automatically adapted without manual configuration; through real-time environment perception and dynamic weight distribution, the accuracy and fluency of conference scene switching are remarkably improved; and meanwhile, voiceprint dynamic registration and block chain evidence storage technologies are adopted, so that the judicial-level recording security is ensured, and meanwhile, the preparation work before meeting is greatly simplified.

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

The invention provides a phase-sensitive optical time domain reflectometer system and method, and the system comprises a first polarization-maintaining coupler which is used for dividing laser generated by a DC laser, and obtaining first laser and second laser; the optical fiber measurement front-end module is used for processing the random signal through pulse shaping and multi-carrier modulation technologies to generate an electric signal, and sequentially performing modulation, amplification, Rayleigh scattering and amplification on the first laser after the electric signal is generated to obtain amplified Rayleigh backscattered light; the second polarization-maintaining coupler is used for dividing the second laser to obtain third laser and local oscillation light; the delay optical fiber is used for processing the third laser to obtain delay light; the third polarization-maintaining coupler is used for combining the delayed light and the amplified Rayleigh backscattered light to obtain combined light; the receiver is used for processing the combined light and the local oscillation light to obtain multiple paths of target electric signals; and the oscilloscope is used for processing multiple paths of target electric signals through low-pass and high-pass filters and a phase noise compensation algorithm so as to determine power and phase distribution. The system cost can be reduced.

The cognitive communication system comprises a spectrum sensing unit, an intelligent cognitive communication decision module, a reconfigurable optical local oscillator generation module, a digital signal processing module, a cognitive communication receiving end and a cognitive communication transmitting end. The cognitive communication receiving end comprises a communication receiving radio frequency processing module, a photon radio frequency communication receiving module and a communication receiving intermediate frequency processing module; the cognitive communication transmitting end comprises a communication transmitting radio frequency processing module, a photon radio frequency communication transmitting module and a communication transmitting intermediate frequency processing module; the photon radio frequency communication receiving module converts a radio frequency signal into an optical carrier wave through optical carrier wave modulation, and down-converts the optical carrier wave into an intermediate frequency by using a reconfigurable optical local oscillator signal; the photon radio frequency communication transmitting module converts an intermediate frequency signal into an optical carrier through optical carrier modulation, and performs up-conversion to a radio frequency by using a reconfigurable optical local oscillator signal. According to the invention, through deep fusion of the photon technology and cognitive communication, the bandwidth, flexibility, anti-interference capability and dynamic reconstruction capability of the system are significantly improved.

The invention discloses an electric energy quality optimization method and system based on carrier modulation, and relates to the field of electric energy quality optimization, and the method comprises the steps: obtaining bridge arm information of a distributed energy storage type electric energy quality controller, and determining a carrier amplitude adjustment strategy; determining a target zero-sequence component needing to be injected through carrier characteristics based on the carrier amplitude adjustment strategy; according to the target zero-sequence component, performing superposition on the original modulation wave to generate a target modulation wave; adjusting the power of the power grid based on the target modulating wave, and carrying out dynamic compensation on the capacitance voltage deviation; the harmonic suppression capability is improved, and the power distribution dynamic response efficiency is enhanced, so that the optimization of the electric energy quality is realized, and the problem that the real-time performance and the reliability of the electric energy quality regulation are reduced due to the limitation of harmonic compensation and the lack of real-time dynamic response in the conventional pulse width modulation method is solved.

A carrier reconstruction method to eliminate DC and low-frequency circulating currents in multi-parallel converters is disclosed, addressing the issue of DC and low-frequency circulating currents introduced by traditional carrier phase shift methods. By alternately setting complementary initial phase angles of carriers, this reconstruction method achieves balanced and symmetrical carriers within two periods, thereby eliminating the DC and low-frequency circulating currents caused by asymmetric carriers. The reconstructed carrier method provides a universal solution. It can solve all DC and low-frequency circulating currents issues based on traditional phase-shift carrier modulation strategies. Additionally, the carrier reconstruction method prevents core saturation in common mode inductors or coupled inductors, simplifying the design complexity of these inductors. This disclosure not only reduces inductor size and improves inductor efficiency but also enhances the overall performance of multi-parallel converters.

The invention provides a signal pre-distortion processing method and device, electronic equipment and a storage medium, and relates to the technical field of communication, and the method comprises the steps: firstly carrying out the calculation of historical baseband data and historical baseband feedback data through a memory polynomial model, and obtaining a pre-distortion complex number coefficient group, then applying the predistortion complex coefficient group to a baseband signal to generate an in-phase component signal and a quadrature component signal containing amplitude and phase predistortion information, and then respectively carrying out carrier modulation on the in-phase component signal and the quadrature component signal to obtain an in-phase branch signal and a quadrature branch signal; and then calculating according to the in-phase branch signal and the orthogonal branch signal to obtain a pre-lost real signal, and finally carrying out carrier modulation on the pre-lost real signal to obtain an up-conversion signal. By implementing the technical scheme provided by the invention, the technical problem that phase pre-distortion information cannot be reserved in a signal pre-distortion process is solved.

The invention relates to the field of cloud edge cooperative scheduling, and discloses a communication network resource management system and method based on intelligent scheduling, and the method comprises the steps: carrying out the phase separation domain splitting processing of a real-time communication trace, scattering the carrier wave off-modulation texture, the edge channel congestion emergence sequence and the micro-burst session cluster to a plurality of dynamic interaction cavities; under the guidance of the time-varying disturbance skeleton diagram, performing reverse stitching and rhythm bias turn-back on the cloud edge response loop, and writing the cloud edge response loop into an instantaneous cache loop of an edge node; identifying a cloud edge response loop and constructing a self-adjusting sequence factor through signal folding disorder in an error frequency recursion layer; based on a time sequence reconstruction pattern in a transition state regulation and control domain, mapping each edge node into a potential distribution factor matrix; and when the intelligent scheduling chain track enters the stable plastic transition window, performing lamination fusion calculation processing on the transition state regulation and control domain. The method has the advantage of improving the utilization rate of network resources.

The invention provides a seismic data bidirectional frequency band expansion method based on carrier modulation, which relates to the field of seismic exploration, and comprises the following steps: processing original seismic data through time window segmentation, calculating an autocorrelation function and carrying out time domain continuation; solving a prediction coefficient based on entropy maximization constraint to generate an amplitude spectrum; calculating a boundary attenuation rate through boundary frequency point positioning; constructing an attenuation compensation function to generate a frequency domain carrier function; applying sparse constraint to solve a weighting factor and iteratively calculating a modulation amplitude spectrum; and finally, carrying out combined inverse transformation with an original phase spectrum to obtain expanded data. According to the method, the resolution and the signal-to-noise ratio of the seismic data are effectively improved, and the seismic interpretation precision is improved.

The present disclosure provides a leakage current suppression method for a string photovoltaic system. The leakage current suppression method includes the following steps: S100, inputting synchronous carriers to a plurality of parallel inverters included in the photovoltaic system; S200, carrying out carrier modulation on the inverters; and S300, controlling the switching state of each inverter according to the result of carrier modulation, and then dislocating common-mode components output by each inverter, so that part of the common-mode components of each inverter are canceled out, and the potential variation of the common-mode components output by the photovoltaic system is reduced. The method has the beneficial effects that the leakage current suppression method in the present disclosure is pure in software optimization, low in cost and simple in implementation method. The potential variation of the common-mode components output by the photovoltaic system is reduced by optimizing the switching state action sequence of each inverter, so that the suppression for leakage current is realized.

The invention belongs to the technical field of power electronics, and provides a multi-degree-of-freedom general carrier modulation method and system for a current source converter, and the method comprises the steps: constructing a modular cascade current source converter; a sine pulse width sequence is output through carrier modulation to analyze direct-current side voltage harmonic distribution in the constructed modular cascade current source type converter; determining the optimal phase shift angle of the modular cascade current source type converter by taking the sine pulse width sequence waveform quality, the switching frequency and the DC voltage performance optimization as optimization targets according to the distribution result of the DC side voltage harmonic waves; and adjusting the three-phase carrier wave of each current source module in the current source type converter based on the determined optimal phase shift angle, and completing multi-degree-of-freedom general carrier wave modulation of the current source type converter.

The present invention discloses a low-complexity peak-to-average power ratio (PAPR) suppression method for multi-carrier modulation signals based on ADMM, belonging to the field of wireless communication. The method includes: introducing phase shifts to each sub-carrier in the signal transmission frequency domain of the multi-carrier modulation system; obtaining the time-domain waveform through oversampling and mathematically modeling the PAPR to obtain an optimization problem; in the Lagrangian function of the optimization problem, fixing the phase factor and the Lagrange multiplier, and then optimizing the optimization objective; fixing the optimization objective and the Lagrange multiplier of this optimization problem and using the fast Fourier transform (FFT) to optimize the phase factor; updating the Lagrange multiplier according to the optimized optimization objective, phase factor and constraint conditions, and iterating repeatedly until convergence, and optimizing the PAPR of the multi-carrier modulation through the optimized phase factor. The PAPR suppression method of the present invention has good PAPR optimization effect and low computational complexity.

The present application relates to the technical field of remote control wake-up, and discloses a remote control wake-up method, apparatus, device and storage medium. The method includes: performing multi-concatenated encoding processing on a key signal of the remote control to obtain multi-concatenated encoded data and generate a session key; performing adaptive carrier modulation to obtain a dynamic modulation signal; performing multi-band transmission control processing and adaptive power control to obtain a transmission control signal; performing low-power management on the remote control system, creating a multi-level sleep strategy and a dynamic power consumption control scheme, and controlling a signal processor to receive multi-band optical signals; performing parallel processing and adaptive decoding on the multi-band optical signals to obtain decoded multi-concatenated encoded data; performing multi-factor authentication processing on the decoded multi-concatenated encoded data based on the session key to obtain a secure wake-up instruction, thereby improving the reliability and security of the wake-up, optimizing the power consumption management strategy, and enhancing the signal processing capability.

The invention discloses a direct-current ship power grid fault flexible ride-through method based on zero-sequence current injection, which belongs to the technical field of direct-current ship power grid fault protection, and comprises the following steps: when a switch fault is detected, positioning the position of a fault switch; calculating the degree of asymmetry of the direct-current voltage according to the output voltage requirement of the inverter; the direct-current voltage asymmetry degree serves as input, the rectifier is controlled through carrier amplitude modulation and zero-sequence component injection, and asymmetric direct-current voltage is output; the method comprises the following steps of: determining locking and conducting switches when different switch faults occur, and controlling an inverter to realize generation of separated alternating-current phase voltage and optimal zero-sequence component injection through two-level carrier modulation according to asymmetric direct-current voltage so as to complete flexible fault ride-through of the frequency converter. By adopting the method, the processes of capacitor discharge, energy feedback and the like in the fault period are adjusted through the control factors, system instability and equipment reverse rotation are prevented, and continuous power supply and operation safety of a ship power grid are guaranteed.

The present invention discloses a multi - carrier modulation scheme for reconstructing orthogonal chirp multiplexing signals based on the KK relationship. By constructing a single - sideband OCDM modulation signal and using digital up - conversion technology, the real part and the imaginary part of the frequency - converted OCDM signal satisfy the Kramers - Kroning relationship. At the receiving end, a KK receiver is adopted to reconstruct the real - part and imaginary - part information of the OCDM signal, ultimately improving the receiving sensitivity of the communication system.

The present application provides a high-power semiconductor light-emitting chip with longitudinal carrier modulation and a manufacturing method therefor. The high-power semiconductor light-emitting chip with longitudinal carrier modulation includes: an active layer; a first semiconductor cell layer disposed on the active layer, wherein the first semiconductor cell layer includes a contact doped layer, the first semiconductor cell layer includes a plurality of current blocking regions that are disposed at least in the contact doped layer and distributed in a slow-axis direction, and the parts of the first semiconductor cell layer between neighboring current blocking regions act as current injection regions, wherein a current density function J(z) of current density in the active layer satisfies:J⁡(z)=(Jop-J0)·f⁡(z)+J0;f⁡(z)=Np(z)1L·∫L0Np(z)⁢dz;whereinJ0=α⁢N0+bN02+cN03,N0=Ntr⁢exp⁡(αi+amΓ⁢g0);and an average resistivity r(z) of corresponding current injection regions and current blocking regions at any position in the cavity-length direction satisfiesr⁡(z)=r0·1f⁡(z)+J0 / (Jop-J0),where r0 is a coefficient of r(z).

The invention relates to a control circuit of ultrasonic equipment and the ultrasonic equipment. The ultrasonic equipment comprises a power amplifier, a transducer, a control module and a signal superposition module. The power amplifier is configured to configure working parameters of the power amplifier according to the control signal and perform power amplification on the input driving signal; the transducer is configured to receive the driving signal subjected to power amplification to work and output a reflected signal; the control module is configured to obtain the driving signal and the reflection signal so as to calculate load parameters of the transducer; and generating a control signal according to the load parameter so as to adjust the working parameter of the power amplifier, and the signal superposition module is configured to inject the control signal into the driving signal through carrier modulation and output the control signal to the power amplifier. The ultrasonic equipment can solve the technical problem that a traditional ultrasonic power amplifier has high static loss in a no-load state, and the energy efficiency is improved.

The invention relates to the related field of a wireless communication technology, in particular to a directional sound propagation method for an interphone loudspeaker, which realizes directional sound propagation, reduces noise pollution, has stronger confidentiality due to the fact that sound cannot be diffused all around, and realizes directional sound propagation of the interphone loudspeaker through an ultrasonic carrier modulation technology. According to the invention, sound directional propagation is realized on the basis of original hardware of a common interphone, the whole machine does not need to be reconstructed, the limitation that a traditional directional loudspeaker needs special hardware is broken through, the technical path is novel, and the realization cost of a directional propagation function is greatly reduced; and large-scale popularization and application of common interphones are facilitated.