173 results about "Frequency generation" patented technology

The invention discloses a multi-modulation-format vector signal modulator based on microwave photonics, and relates to the field of microwave photonics. Comprising an IQ quadrature modulation module, a continuous wave laser, a first power optical splitter, an optical carrier frequency generation module, a polarization beam combiner, an optical amplifier, a polarization beam splitter and a photoelectric balance detector module, the IQ quadrature modulation module comprises a double-parallel Mach-Zehnder modulator, a first forming filter, a second forming filter, a first attenuator, a second attenuator, a first direct current voltage stabilization source and a second direct current voltage stabilization source. According to the invention, the formed and filtered IQ baseband signal is input into the double-parallel Mach-Zehnder modulator for quadrature modulation, the IQ baseband signal and the other path of optical carrier signal subjected to differential MZM frequency multiplication are subjected to polarization beam combination, and then the signal is converted into a radio frequency signal through PD, so that the generation of a high-frequency-band and multi-modulation-format vector signal is realized, and the high-frequency-band multi-modulation-format vector signal is suitable for the fields of high-speed communication, photon radar and the like.

Room and / or area disinfection apparatuses are provided which generate pulses of germicidal light at a frequency greater than 3 Hz and project the pulses of light exterior to the disinfection apparatuses. In some cases, the apparatus includes processor executable program instructions for receiving data regarding characteristics of a space in which the disinfection apparatus is to be operated. In addition or alternatively, the apparatus may include a remote user interface to affect operation of the disinfection apparatus. In other cases, the apparatus may additionally or alternatively include a means for automatically moving the disinfection apparatus. In yet other additional or alternative cases, the disinfection apparatus may be void of an opaque component 360° around an elongated portion of the germicidal pulsed light source such that light emitted from the germicidal pulsed light source encircles the disinfection apparatus.

The invention provides a pulse laser frequency control device and method, and belongs to the technical field of pulse fiber lasers. Comprising a frequency measurement module used for acquiring the frequency of a first external control signal; the frequency selection and frequency division module generates and outputs a seed frequency signal and a frequency division coefficient according to the frequency of the first external control signal obtained by the frequency measurement module; the frequency generation module is used for receiving the seed frequency signal output by the frequency selection and division module and outputting a seed frequency trigger signal; the pulse generation module is used for acquiring the seed frequency trigger signal output by the frequency generation module and providing a seed pulse signal for the seed driver, and the seed driver outputs pulse light according to the input seed pulse signal; the current control module is used for receiving a second external control signal and providing a current driving signal for each pump driver; and the RAM controller is used for receiving a third external control signal and the frequency division coefficient output by the frequency selection and frequency division module, and controlling the acousto-optic modulator to work.

The invention belongs to the field of computer vision, and relates to an efficient image synthesis technology of a generative adversarial network (GAN). Aiming at the problems of insufficient high-frequency details, limited geometric denaturation and the like and low calculation efficiency in high-resolution image synthesis of the existing generation method, the invention provides a frequency domain sensing generation method based on wavelet driving WE-GPMConv-StyleGAN. According to the model, discrete wavelet transform is embedded in a StyleGAN3 architecture, a traditional convolution operation is decomposed into a two-stage process of wavelet domain feature extraction and cross-band fusion, and calculation complexity is reduced through grouping separable convolution; designing a low-frequency enhancement module to expand the global structure modeling capability, and expanding a receptive field by using secondary wavelet decomposition; a high-frequency enhancement module is introduced to enhance texture details through a residual structure and cross-channel interaction; in combination with a staged training strategy, low-frequency global features are optimized preferentially in the early stage, and local details are refined by combining a high-frequency module in the later stage. According to the invention, through a wavelet domain multiband decoupling and fusion mechanism, the high-frequency generation quality and geometric denaturation are significantly improved, and a frequency domain driving solution with both efficiency and precision is provided for high-resolution image generation.

The invention belongs to the technical field of optical frequency comb repetition frequency, and discloses an optical frequency comb repetition frequency control system and a locking method, and the system comprises a light source module, a signal detection module, a frequency measurement module, a comparison frequency generation module and a feedback control module. The light source module generates an optical frequency comb; the signal detection module converts the optical signal into an electric signal, noise reduction and amplification processing are carried out through a signal processor, and noise reduction adopts a wavelet transform method; the frequency measurement module adopts a dual measurement mode of a frequency counter and a spectrum analyzer to accurately measure repetition frequency; the comparison frequency generation module provides high-precision reference frequency; and the feedback control module performs closed-loop adjustment according to the difference value between the measurement frequency and the reference frequency. By optimizing signal processing and adopting dual-frequency measurement and closed-loop feedback control, the problems of weak electric signals, large noise interference and low frequency control precision in the prior art are effectively solved, and the stability and accuracy of the repetition frequency of the optical frequency comb are improved.

An optical frequency generation system (100), comprising: - reference atoms (7) in a gas phase, - an interrogation laser source (1) configured to emit an interrogation signal (101) comprising a first optical frequency suitable for exciting a two-photon transition in said reference atoms (7), said interrogation signal (101) being configured to interact with said reference atoms (7) in a Doppler-free scheme; - optical frequency modulation means (31, 31a, 31b) configured to adjust said first optical frequency and to modulate said first optical frequency at a first modulation frequency f1; - an optical sensor (9) configured to detect a fluorescence signal (110) from said reference atoms (7); - a first control loop (10) configured to lock said first optical frequency to a resonance frequency of said two-photon transition, said fluorescence signal (110) being input into the first control loop (10); - a mitigation laser source (2) configured to emit a mitigation signal (102) comprising a second optical frequency selected to produce a light-shift of said two-photon transition of opposite sign of the light-shift produced by the interrogation signal (101); characterized in that the optical frequency generation system (100) further comprises: - optical amplitude modulation means (5) configured to modulate the amplitude of the interrogation signal (101) and of the mitigation signal (102) at a second modulation frequency f2, and - a second control loop (20) configured to adjust the relative amplitude of the mitigation signal (102) with respect to the interrogation signal (101) such as to cancel the effective light-shift of the combined interrogation (101) and mitigation (102) signals.

An electronic device may include clocking circuitry with primary and secondary lasers that generate first and second optical local oscillator (LO) signals. A phase-locked loop (PLL) may tune the secondary laser based to phase lock the first and second optical LO signals. A self-injection locking loop path may couple an output of the secondary laser to its input. The self-injection locking loop path may include a first mixer and a second mixer. The first mixer may generate a beat signal using the first and second optical LO signals. The second mixer may generate a self-injection locking signal based on the first optical LO signal and the beat signal. A delay line or optical resonator may iteratively self-inject the self-injection locking signal onto the secondary laser. This may serve to minimize phase noise and jitter of the optical LO signals.

The invention relates to the technical field of interference suppression, in particular to an electromagnetic compatibility optimization method and system for a ship shaft frequency converter, and the method comprises the steps: carrying out the term-by-term judgment of sensitive interference energy, current errors and switching loss after the discretization and jump limitation based on a frequency sequence, and screening out a boundary-crossing sequence, the genetic algorithm executes cross combination and amplitude superposition in the residual sequence, a new frequency set is formed through transformation and rearrangement, frequency points are distributed in a plurality of intervals to be reorganized, the switch state is predicted and updated one by one through Kalman filtering, observation residual errors are corrected in real time, and the frequency points are reorganized. The harmonic distortion rate, the radiation intensity and the instruction change amplitude are synchronously output by taking the time index as a sequence, the deviation is compensated at the amplitude and phase level, the harmonic index and the radiation index are controlled in an agreed range, the switching loss and the instruction change are within threshold values, and a complete closed loop covering frequency generation, harmonic correction and sequence updating is formed.

A light source includes a mode-locked laser; a beam splitter that branches the femtosecond optical pulse train; a CW solid-state laser; a first beam combiner that outputs one side of the femtosecond optical pulse train on the same axis; a secondary nonlinear optical element that outputs a difference frequency generation and conversion optical pulse train from either a continuous wave or a femtosecond optical pulse train; an amplifier that amplifies the difference frequency generation and conversion optical pulse train; a polarization-maintaining all normal dispersion high nonlinear fiber that converts the other femtosecond optical pulse train into a supercontinuum optical pulse train; a first dispersion medium that converts the supercontinuum optical pulse train into a pulse width that is approximately the same as the difference frequency generation and conversion optical pulse train; and a second beam combiner that multiplexes and outputs the difference frequency generation and conversion optical pulse train and the supercontinuum optical pulse train.

The invention discloses an image transmitting and displaying method and electronic equipment, and relates to the technical field of terminals. The electronic device comprises an SoC and a display screen, when a display drive of the SoC is not sent to display, after high-frequency TE is started, a TE signal is generated according to a second frequency, Vsync is generated according to a first frequency, and the second frequency is larger than the first frequency. The SoC generates the timestamp according to the first frequency based on the TE signal, so that the value of the calibration count can be normally increased, and the calibration counting of the Vsync signal and the TE signal is successfully completed.

The utility model relates to the technical field of alarms, in particular to a frequency-adjustable alarm module, which is characterized in that a master control module is respectively in communication connection with a frequency generation module and an alarm execution module, the frequency generation module is in communication connection with an infrared transceiver module, and the infrared transceiver module is in communication connection with the alarm execution module. And the power supply management module is respectively and electrically connected with the main control module, the infrared transmitting and receiving module and the alarm execution module. According to the utility model, different components in the alarm, the infrared transmitter and the wireless charging PCB are modularly divided according to functions and effects of the components; the functions of unlocking, multi-level alarming and frequency switching achieved based on the communication relation are highlighted, a more flexible and effective alarming mode is achieved, the defects of a traditional alarm are overcome, and high market application value is achieved.

A single-material-double-process parametric laser-wavelength converter includes a pump-laser source, a nonlinear optical material, a first optical reflective element, and a second optical reflective element. The pump-laser source is configured to emit a pump-laser pulse light. The nonlinear optical material receives the pump-laser pulse and generates a signal-laser pulse and a partially depleted pump-laser pulse through optical parametric amplification. The first optical reflective element is configured to reflect the signal-laser pulse back to the same nonlinear optical material. The second optical reflective element is configured to reflect the partially depleted pump-laser pulse back to the same nonlinear optical material. With an appropriate adjustment on the reflecting path lengths, the nonlinear optical material is configured to receive the temporally synchronized signal-laser pulse and the partially depleted pump-laser pulse to generate an idler output through difference frequency generation. Both optical parametric amplification and difference frequency generation occur in the same nonlinear optical material.

The invention relates to the technical field of construction site management, in particular to a highway construction site Internet of Things positioning and tracking system which comprises a fundamental frequency calculation module, a parameter generation module, a central frequency generation module, a central frequency calculation module and a central frequency calculation module. The fundamental frequency calculation module collects engine rotating speed and angular speed signals and calculates engine vibration fundamental frequency by combining ignition factors. The dynamic filtering module is used for configuring the weighting coefficient as a difference equation parameter, blocking bandwidth energy through convolution filtering and generating a purification angular velocity; the trajectory tracking module is used for calculating the purification angular velocity and a zero deviation value, calling a Runge-Kutta algorithm for integral generation of a course angle, and generating a position coordinate in combination with a driving speed. According to the method, the vibration fundamental frequency is inversely calculated by collecting the rotating speed of the engine, the blocking bandwidth is dynamically constructed according to the interference frequency, the frequency characteristic is mapped to be a difference equation coefficient, vibration noise is accurately stripped, course drift is eliminated, and it is ensured that the positioning coordinates matched with the actual track are output.

The invention discloses a multi-frequency cancer cell cleaning cabin for cancer patients and application, and relates to the field of cancer treatment equipment. The cleaning cabin comprises a cabin main body, a multi-frequency generation module, a targeted positioning module, a temperature control module, a monitoring module and a central control unit, an adjustable lying platform and an electromagnetic shielding layer are arranged in the cabin main body, the multi-frequency generation module comprises three independent frequency generators and a directional radiation antenna, and the targeted positioning module positions cancer cells through an infrared thermal imaging assembly and an ultrasonic imaging assembly. Cancer cell information is obtained through targeted positioning, the central control unit regulates and controls the multi-frequency generation module to output adaptive frequency, and low-damage cleaning of cancer cells of different depths is achieved in combination with temperature control and real-time monitoring. The traditional Chinese medicine composition solves the problems of large side effect and narrow application range in the existing treatment, has the advantages of small side effect, wide application range, safety and controllability, and is suitable for postoperative residue removal of cancers and middle and advanced palliation treatment.

This invention belongs to the field of analog integrated circuit technology, specifically relating to a frequency adaptive circuit for downhole detection. This invention utilizes a closed-loop adaptive feedback mechanism, employing multiple excitation frequencies generated by a frequency generator to continuously match and adapt to the transducer's resonant frequency. When a set of excitation frequencies achieves the highest matching degree with the resonant frequency, the echo energy reaches its peak. The frequency generator is adaptively adjusted based on the excitation frequency corresponding to the maximum peak signal obtained during the detection phase, and this optimal excitation frequency is used to generate the excitation signal in subsequent operations, thus completing the adaptation between the excitation frequency and the resonant frequency. This invention effectively avoids the influence of downhole temperature and pressure changes on the transducer's resonant frequency, and combines high automation, good real-time performance, and high imaging quality.

A method for identifying the dynamic behavior of a non-rigid object (10), the object being fixedly attached to a platform (12) that can be set in motion by an actuation device (14) is proposed. The method comprises actuation of the drive device (14) so ​​as to impart to the object a predefined periodic movement at a frequency, called the "cycle frequency". The periodic movement is a combination of at least two geometrically independent periodic elementary movements. The method comprises recording during actuation the variation of at least one quantity representative of a dynamic behavior, called the "dynamic quantity", and calculating for each of the cycle frequencies of the components called "elementary components", a Fourier transform of the variation of said at least one dynamic quantity for each elementary frequency.A dynamic behavior of the object is determined based on the variation of the elementary components. Abstract figure: Figure 2.

One or more systems, devices, computer-implemented methods and / or computer program products of use provided herein relate to ultrasound coexistence in an FMS. A system can comprise a memory that can store computer-executable components. The system can further comprise a processor that can execute the computer-executable components stored in the memory, wherein the computer-executable components can comprise a frequency generation component that can use a variable frequency generator circuitry to generate electronic signals at one or more different frequencies in at least one fetal sensor device (FSD) of a fetal monitoring system (FMS), wherein the electronic signals can cause a transducer of the at least one FSD to generate ultrasound signals at the one or more different frequencies.

A scattering parameter measurement device based on microwave photonic mixing includes a microwave generation module 1, a signal loading module 2, a local oscillator frequency generation module 3, a multi-channel microwave photonic mixing module 4, an analog-to-digital converter (ADC) module 5, and a signal processing module 6. Along the signal output direction of the multi-channel microwave photonic mixing module 4, the ADC module 5 and the signal processing module 6 are sequentially arranged. This invention utilizes microwave photonic mixing technology and a local oscillator source with relatively small bandwidth to down-convert a high-frequency microwave signal to a fixed-frequency intermediate frequency (IF) signal. This reduces the bandwidth requirements of the receiver's electronic components and the sampling rate requirements of the ADC. It abandons the traditional superheterodyne structure and / or direct conversion structure, using a miniaturized continuous optical module as the light source for microwave photonic mixing, simplifying the system structure and reducing cost and power consumption.

The invention relates to a device for generating high-frequency currents for the cosmetic and / or therapeutic treatment of tissue by means of electrodes of the device, comprising: a high-frequency energy source for generating high-frequency currents and at least one first electrode pair having two electrodes for applying the high-frequency currents to the tissue, which electrodes are each connected to an output of the high-frequency energy source, which device is designed to generate the high-frequency currents at a plurality of different frequencies fj by means of the high-frequency energy source, characterised in that the device is designed to generate the currents at a plurality of different frequencies fj by means of the high-frequency energy source in a temporal sequence having sequence steps Sj where j=1, 2, …, M; M ∈ ℕ; at least one current generated in said sequence step Sj and having the frequency fj and a duration Tj for which the current at the frequency fj is generated in the sequence step Sj is assigned to each sequence step Sj, and at least one sequence of the frequencies fj is a random sequence. In addition, at least one of the following additional features is implemented: The current intensity of the currents lies between 100 mA and 2 A, preferably between 300 mA and 1 A. The frequencies fj lie in a frequency range between 0.1 MHz and 20 MHz, preferably between 0.1 MHz and 10 MHz, most preferably between 0.1 MHz and 3 MHz. The duration Tj is less than 100 ms, preferably less than 50 ms. The invention further relates to a corresponding treatment method, in particular a cosmetic treatment method.

A display driving circuit includes a clock signal generator which generates a clock signal at a frequency in response to a frequency control signal, a frequency variation determiner which adaptively changes a frequency variation of the clock signal, based on a magnitude of a deviation between the frequency of the clock signal and a target frequency calculated based on a reference clock signal supplied from the outside, and a frequency controller which generates the frequency control signal which updates the frequency of the clock signal, based on the frequency variation, and provides the frequency control signal to the clock signal generator.

The invention relates to the technical field of fan rotating speed detection, and particularly provides a fan rotating speed detection method and device and electronic equipment. The method comprises the steps that the total number of sampling points and the total number of high-level sampling points in a fan rotating speed detection period are counted; the total number of high-level sampling points refers to the number of high-level sampling points obtained by sampling frequency generation signals of the fan in a fan rotating speed detection period, and the high-level duty ratio in the fan rotating speed detection period is obtained according to the number of the high-level sampling points and the total number of sampling points; if it is determined that the frequency generation signal, obtained in the fan rotating speed detection period, of the fan is a normal signal according to the high-level duty ratio, the latest current fan rotating speed is determined based on the fan rotating speed detection period; and if it is determined that the fan frequency generation signal obtained in the fan rotating speed detection period is abnormal according to the high-level duty ratio, the specified fan rotating speed is determined as the latest current fan rotating speed. Therefore, the accuracy of fan rotating speed detection is improved.

A laser assembly and a method for generating continuous-wave (CW) light at approximately 193 nm (between 180 nm and 200 nm) and at a power of 1W or higher using two CW laser sources: one laser source generating first fundamental light that is twice frequency doubled or otherwise converted into first CW light having a first deep-ultraviolet (DUV) wavelength between 250 nm and 275 nm, the other laser source generating second CW light having an infrared (IR) wavelength between 1300 nm and 1700 nm. A resonant cavity receives the second CW light and generates enhanced CW light at 100 W or higher. A first non-linear optical (NLO) crystal mixes a first enhanced CW light portion and the first CW light to generate sum-frequency generation (SFG) light having a second DUV wavelength. A second NLO crystal mixes a second enhanced CW light portion and the SFG light to generate output CW light at approximately 193 nm.

The novel low-pass notch filter comprises a dielectric substrate, a CPW part, a transition part and an SSPP transmission line part which are sequentially cascaded are arranged on the front face of the dielectric substrate, and six interdigital coupling structures are loaded on the back face of the dielectric substrate in an up-down symmetrical mode; the CPW part is connected with the microwave system; the transition part is used for converting the TEM wave of the CPW structure into the TM wave of the SSPP structure; the SSPP transmission line part comprises six novel SSPP transmission line units; according to the novel SSPP transmission line unit, two sides of a central transmission line are respectively provided with a group of symmetrical linear groove structures which are etched on a CPW grounding plate, a folding groove structure is loaded between each group of symmetrical linear groove structures, and the top end of each folding groove structure is aligned with the top end of each linear groove structure; the interdigital coupling structure is used for generating resonance at a specific frequency and generating a transmission zero point. By loading an interdigital coupling structure on the back surface of the filter, a communication signal at a specific frequency is radiated to a free space, and suppression of the signal at the specific frequency is realized.

The present invention relates to a high-frequency scalp massage device comprising: a handpiece; a high-frequency generation unit for generating a monopolar high-frequency on the basis of a power source supplied from the handpiece; a plurality of high-frequency electrodes coming in contact with the scalp by predetermined intervals so as to apply, to the scalp, the high-frequency waves transmitted from the high-frequency generation unit; and a ground electrode worn on the scalp so as to return the high-frequency waves applied to the scalp from the high-frequency electrodes, wherein the ground electrode is larger than the high-frequency electrodes and disperses the heat generated during the return of the high-frequency waves.

A fluid filled fiber for a quasi-phase matched generator and a laser incorporating such a fluid filled fiber. The liquid filled fiber has charge transfer molecules dissolved in a solvent. In another embodiment, the liquid of the LF fiber comprises or consists essentially of highly polar liquids and / or charge transfer molecules having relatively high molecular dipole values. The liquid filled fiber is usable with a laser for differential frequency generation.

A multimodal hyperspectral vibrational sum-frequency generation (VSFG) platform and a method of tumor diagnosis are provided. The method employs the chemical-specific VSFG microscopy platform as a label-free imaging technique for tumor identification.

According to the frequency generation circuit, the chip and the electronic equipment provided by the embodiment of the invention, the calibration mode is introduced to the gain filtering module, and the calibration voltage is accessed when the gain filtering module is in the calibration mode, so that the offset voltage during gain is calibrated, the calibration state signal is obtained, whether calibration is completed or not can be intuitively indicated through the calibration state signal, and the calibration efficiency is improved. Under the condition that the calibration state signal indicates that calibration is completed, errors caused by offset voltage can be suppressed, the stability of the calibrated gain filtering module is higher, therefore, when the gain filtering module is switched to the filtering mode to filter the target voltage, the integral leakage phenomenon can be effectively reduced, and the stability of the gain filtering module is improved. Therefore, the stability of the target frequency signal generated by the subsequent oscillation module is improved.

The invention discloses a ring oscillation circuit, a chip and electronic equipment, and belongs to the technical field of integrated circuits. The annular oscillation circuit comprises an oscillation driving circuit and an oscillation ring circuit; the oscillation driving circuit is used for driving the oscillation ring circuit according to the first driving capability under the condition that the oscillation ring circuit does not start oscillation; under the condition that the oscillation ring circuit starts oscillation, the oscillation ring circuit is driven according to the second driving capacity, and the first driving capacity is larger than the second driving capacity; and the oscillation ring circuit is used for outputting an orthogonal signal according to the driving of the oscillation driving circuit. According to the ring oscillation circuit, the driving capability of the oscillation ring circuit is dynamically controlled through the oscillation driving circuit, so that the problem that the oscillation ring circuit does not start oscillation due to insufficient driving capability can be avoided, the problem that the oscillation frequency is reduced due to overlarge driving capability can be avoided, an orthogonal signal with higher frequency can be generated, and the reliability of the ring oscillation circuit is improved. Therefore, the method can be applied to applications with higher frequency generation.

The utility model provides an anti-arcing electrode block structure, which is used for providing current for a graphite boat, and comprises an electrode block main body and an electric connecting rod arranged on the electrode block main body, and the electric connecting rod is connected with a power supply. A through mounting hole is formed in the electrode block main body, the outer side of the electrode block main body is provided with an electric connection surface and a supporting surface which face a graphite boat, the electric connection surface is provided with a plurality of graphite bulges, and the plurality of graphite bulges form a contact surface which is in contact with the graphite boat. According to the arrangement, the high conductivity of the graphite bulges is utilized, so that current can be quickly conducted away, and current concentration is prevented; in addition, by means of multi-point contact of the graphite protrusions and the graphite boat, the hidden danger of poor contact caused by foreign matter appearing on the contact face can be effectively eliminated, arcing is prevented, and therefore the high-frequency generation frequency is reduced.

This invention, when generating a desired electrical frequency from a highly accurate optical reference frequency outputted from a frequency reference system including an optical clock and the like, realizes generation of an arbitrarily defined electrical frequency having accuracy of the optical reference frequency without the need for a highly accurate electrical reference frequency. Prior to converting an optical frequency into an electrical frequency, a fine adjustment of a repetition frequency (frep) is performed in an optical domain by using an arbitrarily-defined-frequency generation device (13A). The frequency is synchronized with a frequency reference by the arbitrarily-defined-frequency generation device (13A), and thus the frequency can be converted while maintaining the frequency accuracy equivalent to that of the frequency reference. When compared to fine-adjusting a frequency in an electrical domain, adjustment accuracy for the frequency can be significantly improved. By forming a control system in which the generated electrical frequency returns to the input side and is caused to loop, the accuracy of the desired electrical frequency is enhanced to the accuracy of the optical reference frequency.