218 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.

The invention relates to a system for generating multiple types of coherent time-frequency signals. The system comprises an offset frequency generation module and a multi-source frequency and time generation module, the offset frequency generation module generates coherent time-frequency signals with different frequencies based on the same reference source according to the constellation synchronization requirement of the satellite time-frequency system; the time generation and measurement module generates time frequency signals used by various satellite loads in a frequency division or frequency multiplication mode according to the coherent time frequency signals generated by the offset frequency generation module, generates 1pps signals for the various time frequency signals respectively, measures the phase difference of the 1pps generated by the multi-source coherent time frequency signals, obtains the phase difference of multiple time frequency references and outputs the phase difference. According to the invention, various time-frequency signals required by the satellite load can be generated, the time-frequency signals are coherent, the 1pps phase difference generated by the time-frequency signals is fixed and measurable, and technical support is provided for the satellite load to support measurement of various signal systems.

The invention discloses a control method, a control device and a switching power supply, the control method is applied to an N-phase converter, and the control method comprises the following steps: calculating an electrical parameter output by the N-phase converter and a modulation wave required by each phase bridge arm switching tube when a common-mode voltage reaches an expected value through voltage loop and current loop double closed-loop control; adjusting the current modulation wave of each phase of bridge arm switch tube so as to obtain N first modulation waves; calculating a second frequency required by a modulation wave of each phase of bridge arm switch tube when each phase of bridge arm switch tube realizes ZVS by predicting the magnitude of bridge arm side inductive current pulsation in each phase of LCL filter, taking the second frequency as the frequency of a carrier wave, and generating N carrier waves; and comparing the first modulation wave of each phase of bridge arm switch tube with the corresponding carrier wave to obtain a driving signal for controlling the on and off of each phase of bridge arm switch tube. According to the invention, good harmonic performance can be obtained while low common-mode voltage is realized.

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.

The invention relates to the technical field of underwater communication and positioning, discloses an underwater communication and positioning integrated waveform design method, and aims to optimize the communication and positioning performance of underwater equipment through fusion design. According to the method, a sparse vector coding matrix technology is utilized, the dimension of a sparse signal is reduced into a transmittable modulation symbol, and an integrated waveform is generated by means of inverse discrete Fourier transform (IFFT). The integrated waveform not only has good communication reliability, but also has an excellent self-correlation characteristic, and is suitable for an underwater communication positioning integrated system. According to the technical scheme, the method comprises the key steps of sparse vector mapping, coding matrix dimensionality reduction, pilot frequency generation and insertion, IFFT waveform generation and the like, the joint performance of the underwater communication and positioning integrated system in the changeable marine environment is effectively improved, and the performance of underwater acoustic digital communication and underwater target positioning is remarkably improved.

The invention discloses an I / Q imbalance distortion suppression phase demodulation system based on carrier frequency closed-loop modulation. The I / Q imbalance distortion suppression phase demodulation system comprises an I / Q mixer, an I channel conditioning circuit, a Q channel conditioning circuit, an I channel analog-to-digital converter, a Q channel analog-to-digital converter, a direct digital frequency synthesizer and a microcontroller, the microcontroller comprises an arc tangent module, a carrier frequency generation module, a residual phase calibration module, a feedback control output module and a demodulation phase output module. According to the I / Q imbalance distortion suppression phase demodulation system based on carrier frequency closed-loop modulation, the target of closed-loop control is modified, and on the basis of tracking the phase of an input signal, the mixed signal is modulated on one frequency through feedback control, so that on one hand, the signal is separated from low-frequency noise, and on the other hand, the frequency of the signal is reduced; and on the other hand, the nonlinear harmonic is modulated on the carrier frequency, so that the amplitude of the nonlinear harmonic component is greatly reduced, low-frequency noise floor deterioration is avoided, and signal detection and extraction are facilitated.

A semiconductor laser and a photonic nonlinear circuit chip are integrated together. The nonlinear circuit chip may include a nonlinear waveguide configured or controlled to enable sum-frequency generation, difference-frequency generation, second-harmonic generation, parametric amplification, or other nonlinear processes. Coupling between the semiconductor laser and the nonlinear circuit may be optimized by mode-matching, while back-reflections are minimized by diverting the reflections so that optical isolators are not needed. The integration of the semiconductor laser and the nonlinear photonic circuit chip enables nonlinear optical processing using a compact and scalable platform in a flexible manner that is compatible with different types of semiconductor lasers and different operation regimes. An additional input is provided so users can input an optical signal into the photonic chip for processing therein. In some examples, the photonic chip is configured with pump resonators, such as racetrack resonators. Method and device examples are described herein.

The present disclosure provides an isolation integrated circuit, a carrier frequency control circuit and a modulation signal generation method. The isolation integrated circuit includes a carrier frequency generation circuit, a carrier frequency control circuit and a modulation circuit. The carrier frequency generation circuit generates a carrier frequency signal. The carrier frequency control circuit detects enabling periods and disabling periods of an input signal, controls the carrier frequency generation circuit to output the carrier frequency signal during the enabling periods, and controls the carrier frequency generation circuit to stop outputting the carrier frequency signal in the output periods of timing pulses during the disabling periods. The timing pulses are generated in response to detection of entering the disabling periods. The modulation circuit receives the input signal and the carrier frequency signal, and outputs a modulation signal according to the input signal and the carrier frequency signal.

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 provides a method and device for generating indicating light based on laser frequency doubling and an optical fiber laser, the device comprises a dual-wavelength conversion unit and a frequency doubling crystal, the dual-wavelength conversion unit receives incident laser and converts the incident laser into dual-wavelength laser containing a base wavelength and an original wavelength, the frequency doubling crystal is connected with a light path of the dual-wavelength conversion unit, and the dual-wavelength conversion unit receives the incident laser and converts the incident laser into dual-wavelength laser containing a base wavelength and an original wavelength. The dual-wavelength conversion unit is used for converting dual-wavelength laser into double-wavelength laser, multiplying base-wavelength laser in the dual-wavelength laser into frequency-doubled wavelength laser corresponding to indicating light and outputting the frequency-doubled wavelength laser and original-wavelength laser on the same optical axis, and the dual-wavelength conversion unit comprises a dual-wavelength high-reflection fiber bragg grating, a lead-doped fiber, a dual-wavelength low-reflection fiber bragg grating and a fiber end cap which are connected in sequence. Therefore, the output concentricity of the indicating light and the laser is ensured, and the optical axes of the two laser beams are basically overlapped.

The invention belongs to the field of closed-loop control of resonant ring micro-electro-mechanical gyroscopes, and particularly relates to a time-sharing digital control system of a resonant ring micro-electro-mechanical gyroscope. Comprising a resonant ring micro-electro-mechanical gyroscope, two modal driving / detection electrode time-sharing switching modules, two modal detection modules, two analog-to-digital converters, three digital-to-analog converters, three single-ended to differential driving modules and a digital processing unit, and the digital processing unit generates driving / detection time-sharing control signals S1 and S2. Performing digital demodulation, filtering, control resolving, direct digital frequency generation and modulation processing on the first modal detection signal to realize time-sharing stable tracking closed-loop control of the resonant frequency of the gyroscope and time-sharing stable closed-loop control of the vibration amplitude; digital demodulation, filtering, control resolving and modulation processing are carried out on the second modal detection signal, and stable control over gyroscope orthogonal compensation and time-sharing stable closed-loop control over the gyroscope angular rate are achieved.

The invention provides an isolated integrated circuit, a carrier frequency control circuit and a modulation signal generation method. The isolated integrated circuit comprises a carrier frequency generation circuit, a carrier frequency control circuit and a modulation circuit. The carrier frequency control circuit detects an enable period and a disable period of the input signal, controls the carrier frequency generation circuit to output the carrier frequency signal during the enable period, and controls the carrier frequency generation circuit to stop outputting the carrier frequency signal during the output period of the timing pulse during the disable period. The timing pulse is generated in response to detecting an entry into the disable period. The modulation circuit receives an input signal and a carrier frequency signal, and outputs a modulation signal according to the input signal and the carrier frequency signal. The carrier frequency control circuit controls the carrier frequency generation circuit to stop outputting the carrier frequency signal in the output period of the timing pulse in the energy forbidding period of the input signal, and compared with the related technology that the carrier frequency signal is not stopped in the energy forbidding period of the input signal, the isolated integrated circuit has lower power consumption.

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.