40 results about "Noise matching" patented technology

The invention provides a voltage amplifier and a preparation method thereof, which can be applied to the technical field of voltage amplifiers. The voltage amplifier method includes: a noise matching transformer including 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, thereby reducing noise of the active amplifier, the target number of turns of the primary winding is determined according to at least one of the first number of turns and the second number of turns, the target number of turns of the secondary winding is determined according to the signal source resistance, the resistance of the primary winding and the single-turn average resistance of the secondary winding, and the primary winding comprises a first tap and a second tap, the secondary winding comprises a positive tap, a negative tap and a center tap; the active amplifier is used for amplifying the signal source voltage according to the 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 invention discloses an ultra-wideband low-noise amplifier based on a double-coupling structure, relates to the field of electronic devices, and is used for solving the problems of large occupied area and large noise coefficient of a distributed amplifier in the prior art. Comprising a broadband input matching network acting on a first-stage circuit, a transconductance enhancement coupling structure and an active bias structure; the parallel RC negative feedback structure and the series-parallel coupling inductance peaking structure act on the second-stage circuit; the transconductance enhancement coupling structure at least comprises a first transistor, a first microstrip line connected with a source electrode of the first transistor and a second microstrip line connected with a drain electrode of the first transistor, and the first microstrip line and the second microstrip line are mutually coupled. Part of drain electrode current signals are coupled to the source electrode to be secondarily amplified, the high-frequency gain of the first-stage circuit is effectively improved, post-stage noise can be restrained, meanwhile, minimum noise matching under high frequency is carried out through the source electrode degeneration inductor and the broadband input matching network, and the noise performance is excellent; and the area can be saved.

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 discloses a low-noise amplifier structure adopting multi-inductor coupling and current multiplexing, which comprises a multi-inductor coupling network and a full-nmos current multiplexing technology network, the multi-inductor coupling network is connected with the full-nmos current multiplexing technology network, the full-nmos current multiplexing technology network is used for enabling the same current to flow through a multi-stage amplifier, and the multi-stage amplifier is connected with the full-nmos current multiplexing technology network. The multi-stage amplifiers share the same power supply voltage; and the multi-inductance coupling network is used for realizing broadband maximum power transmission matching and noise coefficient matching at an input node so as to realize high power transmission and low noise coefficient. According to the invention, broadband input matching and noise matching can be realized at the same time. The invention can be widely applied to the field of radio frequency receiver front ends.

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 invention provides a distributed optical fiber data common-mode noise elimination method and system and a storage medium, and belongs to the field of optical fiber sensing technology application. The method comprises the following steps: inputting original DAS data; extracting a noise standard channel; performing noise matching filtering; performing noise median filtering; and outputting the de-noised data. According to the method, the original DAS data is sequentially subjected to noise matching filtering and noise median filtering, so that the signal-to-noise ratio of the DAS data can be 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 present application relates to the field of speech processing technology, and specifically to a speech interaction recognition method and system for a medical accompanying robot, which specifically includes: dividing the patient speech signal collected by the medical accompanying robot into frames to obtain each speech frame; constructing the medical noise confounding factor of the current speech frame based on the fluctuation characteristics of the signal strength in the current speech frame; constructing the medical noise matching index of the current speech frame based on the medical noise confounding factor of the speech frame of the current speech frame's neighbors and the peak characteristics of the signal strength in the corresponding time period; performing speech enhancement based on the medical noise matching index combined with a speech noise reduction algorithm; and interacting with the robot based on the enhanced speech of the patient. Thus, the speech interaction recognition of the medical accompanying robot is realized, the effect of enhancing the patient's speech signal is improved, the patient's speech part is clearer, and the patient's needs can be more accurately identified through the enhanced speech signal.

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.

A high-gain low-noise amplifier circuit with adjustable power consumption adopts a two-stage cascaded amplification circuit structure, a signal is amplified twice to obtain higher gain, and an inter-stage matching capacitor C4, a source feedback resistor R3 and a source feedback capacitor C6 are used for expanding the bandwidth of a low-noise amplifier and optimizing noise matching. And meanwhile, the second-stage biasing circuit integrates a low-power-consumption function, so that the power consumption of the low-noise amplifier can be reduced while the small-signal performance is ensured, the low-noise amplifier chip can be applied to a communication system with strict power consumption requirements, and the application flexibility of the low-noise amplifier chip is greatly improved.

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 invention discloses a variable gain ultra wide band low noise amplifier with a wide tuning range, which comprises a tunable input matching circuit and an LNA core amplification circuit which are connected together, the tunable input matching circuit is used for input impedance and noise matching, the LNA core amplification circuit is used for gain tuning, and the tunable input matching circuit is used for input impedance and noise matching. The LNA core amplification circuit comprises two cascade cascade circuits, a signal enters the LNA core amplification circuit through the tunable input matching circuit, is amplified through a first cascade amplifier, is further amplified through a second cascade amplifier, and is finally output through an output end. According to the VG-LNA, the problems that the input impedance is unstable, the gain tuning range is small and the gain change step length is inconsistent when a traditional VG-LNA is used for gain tuning in broadband application are solved.

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.