27 results about "Noise matching" patented technology

The invention discloses a WebRTC voice enhancement system and method based on a multi-modal large model, and belongs to the field of artificial intelligence and real-time communication cross technology, and the system comprises an audio and video collection module which is used for synchronously collecting original voice signals and corresponding video image data of a user side through a WebRTC protocol stack, high-precision alignment is realized through timestamp marking and a cache mechanism; the multi-modal feature extraction module is used for extracting audio features from the voice signals, extracting visual lip movement features from the video images and generating text semantic features through a voice recognition engine; a noise matching and updating module; a multi-modal semantic perception enhancement module; an audio reconstruction module; and a WebRTC integration module. According to the invention, high-precision noise suppression and millisecond-level delay are realized while the voice semantic integrity is guaranteed, and the requirements of industrial inspection, vehicle-mounted communication and other scenes on high fidelity, low delay and strong robustness are met.

The invention discloses a high-linearity low-noise amplifier based on harmonic suppression, relates to the field of communication and the technical field of electronic devices, and is used for solving the problem that the noise coefficient of an existing Darlington structure is large. Comprising a noise matching and input matching network, a linearity enhancement structure, a negative feedback structure and a pre-distortion structure. Wherein the linearity enhancement structure at least comprises a first amplification transistor and a second amplification transistor which are arranged in parallel, and is used for improving the linearity of the circuit through harmonic cancellation; the negative feedback structure is connected with the noise matching and input matching network and the pre-distortion structure and is used for expanding circuit bandwidth and optimizing output matching; the pre-distortion structure is used for stabilizing the bias voltage of the third amplification transistor. According to the invention, the linearity of the whole circuit is effectively improved, and the source microstrip lines of the two circuits are utilized to improve the minimum noise matching and improve the noise performance. Noise is reduced, linearity is improved, low-frequency gain is suppressed, and bandwidth of the whole circuit is improved.

The invention relates to a radio frequency coil assembly suitable for a magnetic resonance system, the magnetic resonance system and a control method. The radio frequency coil assembly comprises a coil body formed by arranging a plurality of coil units, and the mode switching circuit is connected with at least one coil unit and used for controlling the coil unit to be switched from a transmitting mode to a receiving mode or from the receiving mode to the transmitting mode. The mode switching circuit is arranged between the radio frequency power amplifier and the coil unit, the pre-amplifier is used for amplifying magnetic resonance signals received by the coil unit, and the matching circuit is arranged between the mode switching circuit and the pre-amplifier and is used for realizing power matching between the radio frequency power amplifier and the coil unit or realizing noise matching between the coil unit and the pre-amplifier. By adopting the arrangement of the invention, the working mode of the radio frequency coil can be conveniently and quickly switched, and the radio frequency assembly and the receiving coil are used for receiving magnetic resonance signals to obtain richer acquisition information, so that the signal-to-noise ratio of a reconstructed image is improved.

The invention relates to the technical field of weighing calibration, in particular to an AI-based electronic scale dynamic anti-cheating calibration method. The method comprises the following steps: firstly, acquiring an attack window to determine an attack pulse signal; matching the electronic scale with cheating devices of different models based on the noise of different offsets of the electronic scale during the real-time weighing period, and determining the maximum signal-to-noise ratio of the matched cheating device as a crystal oscillator noise coefficient; based on the waveform jitter characteristic of the attack pulse signal, matching the attack pulse signal with the simulated attack pulse signal in the contrast library, and determining a pulse gene variation coefficient according to the waveform abnormity of the matched simulated attack pulse signal; determining a behavior layer abnormal value according to the number of times of position transfer of the attack window in different state stages; and according to the crystal oscillator noise coefficient, the pulse gene variation coefficient and the behavior layer abnormal value, respectively correcting the baseline, the cut-off frequency and the sampling interval of the electronic scale. The anti-interference precision of the electronic scale is improved.

The application provides a kind of active noise reduction control method based on smoke stove linkage, range hood, electronic equipment and storage medium, belong to range hood technical field, wherein method includes obtaining the firepower grade signal of the stove;According to the corresponding relationship between the preset stove grade and the noise reduction parameter, determine the noise reduction parameter corresponding to the firepower grade signal;According to the noise reduction parameter, control the active noise reduction module to emit reverse sound wave.The application makes the reverse sound wave can match with the noise under different grades, realizes the accurate adaptation of noise reduction parameter and dynamic noise.

The invention belongs to the technical field of integrated circuits, and particularly relates to a millimeter wave broadband low-noise amplifier. The millimeter wave broadband low-noise amplifier comprises a broadband input matching network, a first-stage cascode amplification stage, a first-stage inter-stage matching network based on three-coil coupling, a second-stage differential cascode amplification stage, a second-stage inter-stage matching network based on an asymmetric resonant cavity, a third-stage differential cascode amplification stage and a broadband output matching network. The broadband input matching network comprises a source electrode degeneration inductor and a series-parallel capacitor inductor network, and good conjugate matching and noise matching can be achieved at the same time within the broadband range. According to the invention, a three-coil coupling architecture and an asymmetric resonant cavity architecture are respectively adopted in the design of an inter-stage matching network, and higher gain and lower gain ripple and noise coefficient are realized in a broadband range.

The invention relates to the technical field of communication, in particular to an ultra-wideband low-noise amplifier based on a coupling expansion technology. The ultra-wideband low-noise amplifier comprises a Cascode amplifying circuit, an input coupling inductor pair and an output coupling inductor pair. A drain stray capacitor Cd and a load capacitor CL in a circuit are rapidly charged through negative electromotive force generated by the mutual inductance effect, the charging time is remarkably shortened, the working bandwidth of the amplifier is greatly expanded on the premise that the noise performance is not sacrificed, meanwhile, the requirement for a multi-stage impedance matching network is simplified through the inherent broadband characteristic of the coupling structure, and the cost is reduced. According to the ultra-wideband power divider, ultra-wideband input and output matching is achieved, noise matching is optimized through the noise optimization capacitor Cex, the chip area and the number of peripheral elements are effectively reduced through the multiplexing inductor function, and finally the contradiction among bandwidth, noise, matching and area power consumption is cooperatively solved under the condition of high integration level.

The present invention provides an active noise matching transformer, which can be applied to the field of transformer technology. The active noise matching transformer includes: a primary coil, a feedback module, a secondary coil, and a first active amplifier. The first end of the primary coil is electrically connected to the output end of a magnetic fluid angular vibration sensor, and the second end of the primary coil is electrically connected to the first end of the feedback module, so that the primary coil and the secondary coil are electromagnetically coupled. The two ends of the secondary coil are respectively electrically connected to the two input ends of the first active amplifier. The second end of the feedback module receives the output signal of the secondary-side loop in which the secondary coil is located, and the third end of the feedback module is grounded. The number of turns of the secondary coil and the equivalent resistance of the feedback module are configured so that, when the system voltage gain of the active noise matching transformer is equal to the target voltage gain, the equivalent input impedance of the primary-side loop in which the primary coil is located is equal to the target impedance.

The invention discloses a radio frequency low-noise amplifier with a trap function. The radio frequency low-noise amplifier comprises a single-ended input matching circuit, a single-ended to differential circuit, a cascode differential amplification circuit, a biasing circuit and a trap circuit, the single-end input matching circuit is an input end of the low noise amplifier and provides a performance compromise scheme of gain matching and noise matching in a working frequency band, the single-end to differential circuit realizes conversion from a single end to a differential signal, and the cascode differential circuit realizes differential high-gain amplification. The bias circuit provides stable bias voltage for an MOS tube in the cascode circuit, and the stability of the bias voltage in the whole working temperature range is achieved through constant-temperature bias current provided by the band-gap reference circuit. According to the low-noise amplifier, the trap circuit is additionally arranged, so that the low-noise amplifier can realize an attenuation function at a strong interference signal frequency, the transmission of interference signals is inhibited, and nonlinear distortion of the amplifier circuit caused by the strong interference signals is effectively prevented.

The application provides a voltage amplifier and a preparation method thereof, and can be applied to the technical field of voltage amplifiers. The voltage amplifier method comprises the following steps: a noise matching transformer comprising a primary winding, a secondary winding and a magnetic core, the noise matching transformer being configured with a target number of turns of the primary winding and a target number of turns of the secondary winding, so as to reduce the noise of an active amplifier, the target number of turns of the primary winding being determined according to at least one of a first number of turns and a second number of turns, the target number of turns of the secondary winding being determined according to a signal source resistance, a resistance of the primary winding and a single-turn average resistance of the secondary winding, the primary winding comprising a first tap and a second tap, and the secondary winding comprising a positive tap, a negative tap and a center tap; and the active amplifier is used for amplifying a signal source voltage according to a gain of the active amplifier, and the gain of the active amplifier is determined according to the target number of turns of the primary winding and the target number of turns of the secondary winding.

The present invention relates to the technical field of surveillance video homology verification, and specifically to a method, system, and device for tracing surveillance videos of the same origin based on pattern noise. The method comprises: screening based on an objective function, obtaining a reference motion-free still image to be restored, a reference motion-free still image to be restored, a motion-free still image to be restored and tested, and a motion-free still image to be restored and tested, according to the screening results, and then superimposing to obtain a restored reference key frame and a restored key frame to be tested; obtaining a key frame matching degree based on a static noise matching degree and a motion noise matching degree, using the structural similarity index value between the restored reference key frame and the corresponding restored key frame to be tested as a weight, and performing a weighted average of the key frame matching degrees to obtain a similarity; when the similarity is greater than a second preset value, the reference video and the video to be tested are from the same surveillance device. The present invention can make the video homology verification results based on pattern noise more accurate.

This invention provides a method and system for testing high-frequency transformer winding coils, relating to the field of high-frequency transformer technology. The method includes the following steps: generating a standard calibration signal matching the target test frequency range, connecting it to an unloaded test link, a short-circuit test link, and a standard impedance load link respectively; collecting noise signal characteristics of each link; and establishing a noise database and calibration coefficient table. Through sensing units deployed around the winding coil, the method non-contactly collects electromagnetic field change data during coil operation in real time. This invention addresses interference problems caused by cable parasitic inductance, environmental electromagnetic noise, and instrument noise in high-frequency scenarios through pre-calibration and adaptive anti-interference compensation mechanisms. By establishing a noise database, it achieves accurate noise matching. Combined with adaptive filtering algorithms and dynamic adjustment of the excitation signal, it significantly improves the testing accuracy of sensitive parameters such as leakage inductance and distributed capacitance, ensuring test reliability.

The invention discloses an anti-interference method of a mobile fire detection system, and belongs to the technical field of fire detection. A comprehensive solution integrating active vibration compensation, dynamic noise cancellation and sub-pixel accurate positioning is provided. Through vibration detection and real-time reverse driving compensation, the offset of the optical system is controlled within 0.02 mm, and the over-distance positioning precision of 0.3 m outside 150 m is achieved; by constructing a noise feature library capable of being dynamically updated and combining real-time noise matching and a reverse counteracting algorithm, vibration and electromagnetic interference are effectively suppressed, the noise reduction effect is improved by more than 30dB, and signal fluctuation is reduced to 0.05 V; through narrowband filtering and a temperature and humidity compensation mechanism, a real fire source is distinguished from vehicle high temperature, illumination and other interferences, and the monthly average false alarm frequency is reduced from more than 5 times to less than 1 times. The comprehensive performance of the flame detection system under severe working conditions is improved, and reliable technical support is provided for early accurate detection and positioning of highway tunnel fires.

The application relates to a millimeter wave reconfigurable common-source common-gate amplifier and a reconfigurable method thereof, which comprises an input reconfigurable matching network, a common-source common-gate transistor and an output reconfigurable matching network. The millimeter wave reconfigurable common-source common-gate amplifier of the application realizes impedance and noise matching of different frequency bands by reconfiguring the capacitance value of the input matching network and the inductance value of the output matching network, and simultaneously combines a transformer coupling gain promotion structure to make different frequency bands have larger amplification gains. The millimeter wave reconfigurable common-source common-gate amplifier circuit structure and the reconfigurable method of the application are simple and suitable for use in a multi-frequency band millimeter wave transceiver system. A conventional millimeter wave amplifier works at a fixed frequency, which limits the application in a multi-frequency communication system.

The invention discloses a doubly-fed ultra-wideband low-noise amplifier architecture based on three-coil magnetic coupling, which is characterized in that a radio frequency signal is input to a first cascode amplifier unit through a first matching network, and the first cascode amplifier unit is connected with a second cascode amplifier unit through a second matching network; the second cascode amplifier unit outputs the amplified radio frequency signal through a third matching network; the first matching network is a double-fed ultra-wideband input noise matching network based on three-coil magnetic coupling, and three-coil magnetic coupling is formed through a source degeneration inductor and a first L-shaped matching network inductor; the second matching network is a double-fed ultra-wideband inter-stage matching network based on three-coil magnetic coupling, and three-coil magnetic coupling is formed through a second parasitic compensation inductor and a second L-shaped matching network inductor; the third matching network is a doubly-fed ultra-wideband output impedance matching network based on three-coil magnetic coupling, and three-coil magnetic coupling is formed through a third parasitic compensation inductor and a third L-shaped matching network inductor.

The invention discloses a low noise amplifier for realizing broadband noise matching, which comprises a broadband input power matching network, a minimum noise coefficient expansion network, an amplification stage and an output stage, the input end of the broadband input power matching network is electrically connected with a signal source, and the broadband input power matching network is used for carrying out impedance matching on an input signal; the minimum noise coefficient expansion network is used for performing noise coefficient expansion on the input signal; the input end of the amplification stage is connected with a signal subjected to impedance matching and noise coefficient expansion, and the amplification stage is used for counteracting signal noise and amplifying the signal; and the input end of the output stage is electrically connected with the output end of the amplification stage, and the output stage is used for carrying out buffering and impedance conversion on the amplified signal from the amplification stage and outputting the buffered signal to an external load. According to the low-noise amplifier, the contradiction between broadband input power matching and broadband noise matching can be broken through, broadband noise matching is achieved on the basis of broadband input power matching, the noise coefficient is made to be matched with the theoretical minimum noise, and the performance of the low-noise amplifier is improved.

The present application relates to a vehicle and a control method thereof. Specifically, a vehicle selectively providing an important sound to an occupant includes a microphone configured to receive a noise, a speaker, a storage configured to store a plurality of sound waveforms and a warning sound source corresponding to each of the plurality of sound waveforms, and a controller configured to generate a noise cancellation signal based on the noise, control the speaker to output a noise cancellation sound corresponding to the noise cancellation signal, compare a waveform of the noise with the plurality of sound waveforms when a sound pressure level of the noise is greater than a threshold, and control the speaker to play the warning sound source corresponding to the sound waveform matching the noise when the waveform of the noise matches any one of the plurality of sound waveforms.

The utility model relates to a dust collection fan structure and a cleaning base station. The dust collection fan structure comprises a shell part, a fan and a resonator. The shell part is provided with a containing cavity and an air duct, the containing cavity is provided with an inlet and an outlet which are communicated with each other, the air duct is communicated with the outlet, and noise reduction holes are formed in the inner wall of the air duct; the fan is contained in the containing cavity and used for leading airflow into the containing cavity from the inlet and leading the airflow out of the air outlet of the air duct. The resonator is connected to the shell part, and a sound inlet in the resonator is communicated with the noise reduction hole so as to reduce noise. The resonator is arranged, the sound inlet in the resonator communicates with the noise reduction hole, and the sound inlet communicates with the air channel, so that noise, matched with the inherent frequency of the resonator, in the air channel can be eliminated or weakened, the noise is reduced, and the user experience feeling is improved.

The application discloses a low-noise amplifier structure adopting multi-inductive coupling and current multiplexing, comprising a multi-inductive coupling network and a full nmos current multiplexing technology network, wherein the multi-inductive coupling network and the full nmos current multiplexing technology network are connected, the full nmos current multiplexing technology network is used for making multi-stage amplifiers flow through the same current and making the multi-stage amplifiers share the same power voltage, and the multi-inductive coupling network is used for realizing wideband maximum power transmission matching and noise coefficient matching at an input node, so that high power transmission and low noise coefficient are realized. By using the application, wideband input matching and noise matching can be realized simultaneously. The application can be widely applied to the field of radio frequency receiver front ends.

The application provides a small sample positioning algorithm based on electromagnetic flying ring space-time inseparable characteristics, and is used for solving the technical problems that the existing technology needs more training amount to have higher accuracy and that too many classification numbers result in low sample fitting effect in the background art.The application discloses a small sample positioning algorithm based on electromagnetic flying ring space-time inseparable characteristics, and comprises the following steps: step one: selecting a line segment on a half space plane along a propagation axis as a boundary to measure, and obtaining space spectrum data on the line segment; step two: for the data detected by the electromagnetic flying ring, after normalization, the data is decomposed according to the detection sequence, r-axis and z-axis, so that the number of categories is reduced and the number of samples is increased; step three: the data is subjected to noise addition and expansion, the sample amount is increased, and the generalization ability is enhanced, training noise and test noise with different variances are set to carry out combination experiments, and relatively accurate noise matching results are obtained.

The invention discloses a Fresnel aperture coding imaging method and device based on two-stage reconstruction and noise matching, and the method comprises the steps: carrying out the convolution operation of a preprocessed real image and a Fresnel aperture, and obtaining a simulation image; brightness conversion and noise fitting operation are carried out on the simulation image, so that noise distribution of the simulation image is close to real data, and a coding graph is obtained; performing back propagation reconstruction on the coded image to obtain an initial reconstructed image; according to the fast Fourier transform module and the convolutional neural network, constructing a target FFTConv-UNet model; and inputting the initial reconstructed image into the target FFTConv-UNet model to obtain a target reconstructed image. The method can improve the quality of picture reconstruction, and can be widely applied to the technical field of image reconstruction.

The invention provides an active noise matching transformer which can be applied to the technical field of transformers. The active noise matching transformer comprises a primary coil, a feedback module, a secondary coil and a first active amplifier, the first end of the primary coil is electrically connected with the output end of the magnetofluid angular vibration sensor, the second end of the primary coil is electrically connected with the first end of the feedback module, and the primary coil is electromagnetically coupled with the secondary coil; two ends of the secondary coil are electrically connected with two input ends of the first active amplifier respectively; the second end of the feedback module receives an output signal of a secondary side loop where the secondary coil is located, and the third end of the feedback module is grounded; the number of turns of the secondary coil and the equivalent resistance value of the feedback module are configured to enable the equivalent input impedance of the primary side loop where the primary coil is located to be the target impedance under the condition that the system voltage gain of the active noise matching transformer is equal to the target voltage gain.

The utility model discloses a radio frequency receiving front-end circuit based on a coupling structure, which comprises a receiving filter and a low noise amplifier, the receiving filter is composed of three filtering resonators and an impedance matching capacitor inductor, and the low noise amplifier is composed of a primary cascode amplifying circuit and a noise matching capacitor inductor. Meanwhile, the receiving filter and the low-noise amplifier are connected in a coupling structure mode, the size of the whole radio frequency receiving front-end circuit can be reduced, cost is reduced, the impedance matching effect between the filter and the low-noise amplifier is improved, and the radio frequency receiving front-end circuit can be widely applied to the field of wireless communication circuit design.

This invention discloses a high-gain, miniaturized millimeter-wave low-noise amplifier. It includes an input matching network, a noise level circuit, a gain stage circuit, and an output matching network. The low-noise amplifier uses a series gate inductor for noise matching and wide-bandwidth input impedance matching. The gain stage employs a slow-wave transmission line feedback mechanism to achieve high gain and wide bandwidth, and miniaturization is achieved through a spiral inductor and a slow-wave transmission line. The output matching network uses an L-shaped matching network. Unlike traditional inductors or transmission lines, this invention uses a slow-wave transmission line for feedback, achieving high gain while also possessing foldable characteristics and allowing the same inductance value to be achieved with a shorter length, thereby reducing chip area and manufacturing costs.

The invention discloses a broadband low-noise amplifier, relates to the technical field of radio frequency integrated circuits, and solves the problem that a single-stage low-noise amplifier is difficult to realize noise matching and impedance matching in a broadband at the same time. According to the broadband low-noise amplifier, broadband noise matching and impedance matching are achieved based on a three-coil transformer structure, meanwhile, a reverse coupling transformer acts on a common-gate transistor to expand the gain bandwidth, and therefore the effects of broadband input matching, broadband low noise and broadband gain are achieved at the same time under the power consumption of a single-stage circuit.

The application relates to a millimeter wave reconfigurable common-gate amplifier and a reconfigurable method thereof, which comprises an input reconfigurable matching network, a common-gate stage transistor and an output reconfigurable matching network. The millimeter wave reconfigurable common-gate amplifier of the application realizes impedance and noise matching of different frequency bands by reconfiguring the capacitance value of the input matching network and the inductance value of the output matching network, and simultaneously combines a transformer coupling gain promotion structure to make different frequency bands have larger amplification gains. The millimeter wave reconfigurable common-gate amplifier circuit structure and the reconfigurable method of the application are simple and suitable for use in a multi-frequency millimeter wave transceiver system. A conventional millimeter wave amplifier works at a fixed frequency, which limits the application in a multi-frequency communication system.

The invention discloses a W-band self-adaptive gain CMOS low-noise amplifier which comprises a low-noise amplifier stage, a current steering stage, an output stage and a self-adaptive biasing circuit. The low-noise amplification stage adopts a differential common source structure with a source degeneration inductor LS, so that noise matching and linearity optimization are realized; the current steering stage is of a differential cascode structure, a current switching mechanism of the current steering stage is controlled by a self-adaptive bias circuit, and dynamic gain adjustment is achieved; the output stage adopts a differential common-source structure and is positioned behind the current steering stage to ensure output isolation; the self-adaptive circuit is of a four-level cascade common source structure and can adjust system gain in a self-adaptive mode according to input signal power, and linearity maintenance and dynamic range expansion under the condition of high input power are achieved. Center-tapped transformers are adopted among the stages to carry out stage matching and provide direct-current bias.