49 results about "Frequency counter" patented technology

The invention discloses a resistance voltage divider calibration system, method and device based on a self-calibration frequency counter and a medium, and relates to the technical field of metering calibration. The system comprises a stabilized voltage source, a resistance voltage divider, a high-speed electronic switch, a voltage-frequency converter, a self-calibration frequency counter, a satellite signal receiver, an electric energy metering chip and a CPU. According to the invention, the output signal of the voltage divider is connected to the voltage-frequency conversion channel through a specific time sequence, the pulse sequence in proportion to the voltage is generated by using the inherent linear characteristic of the output signal, then the pulse sequence is subjected to high-precision counting and comparative analysis through the self-calibration frequency counter, and finally the dynamic correction of the voltage division ratio parameter is realized. According to the technical path, an external reference source and high-precision voltage measurement equipment do not need to be introduced, in-situ calibration of the characteristic parameters of the voltage divider can be completed in a remote mode, and the long-term stability of the high-voltage electric energy metering device in a complex electromagnetic environment is remarkably improved.

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.

Aspects of the disclosure are directed to voltage sensing for safety-critical applications. In accordance with one aspect, the disclosure includes a multi-phase ring oscillator (RO) configured to operate in a first voltage domain; a frequency counter coupled to the multi-phase RO, the frequency counter configured to accumulate a plurality of phase cycles from the multi-phase RO over a time duration to generate a digital count word; an alarm processor coupled to the frequency counter, the alarm processor configured to receive an alarm state signal from the frequency counter; and a heartbeat detector coupled to the multi-phase RO, the heartbeat detector configured to operate in a second voltage domain and configured to detect a periodic recurrence of a heartbeat pulse to determine an integrity of the sensor function as a whole and alarm state signal in particular.

The invention discloses a hybrid high-precision frequency weighting method and system and electronic equipment, and the method comprises the steps: obtaining an original sound signal, carrying out the analog-to-digital conversion, and carrying out the preprocessing of the sound signal after the analog-to-digital conversion, so as to obtain a signal frequency spectrum; segmenting the signal spectrum, and weighting each segment to obtain a first weighting sound level and a second weighting sound level; superposing the first weighted sound level and the second weighted sound level to determine a total weighted sound level; and performing dynamic error calibration on the total weighted sound level, determining a standard error, and when the standard error is smaller than or equal to a preset error threshold value, outputting the total weighted sound level. According to the invention, a differentiated optimization strategy is adopted, and the attenuation deviation of a traditional digital filter in a low-frequency area is effectively corrected in a low-frequency band; in the middle and high frequency bands, the accuracy is ensured, meanwhile, the occupation of operation resources is remarkably reduced, the signal processing delay time is shortened, and the response requirement of real-time noise monitoring can be met.

The method comprises: obtaining a sending parameter of a sending data packet set by a user; simulating a sending device in a network to send data packets based on the sending parameter, and outputting a level signal to a frequency counter after sending a set number of data packets, and the current output level signal and the last output level signal are opposite in polarity; obtaining a data sending frequency parameter from the frequency counter after sending a total number of data packets; increasing an initial packet frequency in the sending parameter according to a set rule, and returning to the step of simulating the sending device in the network to send data packets based on the sending parameter; decreasing an initial packet length in the sending parameter according to a set rule, and restoring the packet frequency in the sending parameter to the initial packet frequency, and returning to the step of simulating the sending device in the network to send data packets based on the sending parameter.

The application discloses a Bluetooth channel sounding high-precision ranging SOC method, a chip and equipment. The method comprises the following steps: controlling a radio frequency transceiver front end to output a data frame and a received signal strength quantization value, a direct memory access controller carries the data frame to a memory of a channel sounding coprocessor, the coprocessor compares the quantization value with a multipath deep fading threshold value, and when the quantization value is lower than the threshold value, corresponding data is overwritten as a digital zero, a polar coordinate system conversion forms a frequency domain channel response array, an inverse fast Fourier transform is performed to extract a line-of-sight path main peak and calculate a first distance value, a high-frequency counter records a physical round trip time and converts a second distance value, a hardware interlocking comparator calculates a difference value, and when the difference value exceeds a safety tolerance window, a blocking instruction is sent to the direct memory access controller. The application can solve the data distortion problem in a multipath environment and eliminate the delay vulnerability of the anti-relay attack of the physical layer.

The application discloses a kind of laser remote frequency stabilization device based on shared variable, it is related to laser frequency stabilization technical field.The structure of the present application is: laser (1), optical fiber (2) is connected before and after, optical fiber (2) and frequency reference light (3) are connected with laser beam combiner (4) respectively, laser beam combiner (4), electric detector (5), frequency counter (6), data publishing end (7), network (8), data receiving end (9) and laser (1) are sequentially connected.Compared with the similar frequency stabilization device of prior art, the present application can realize long-distance laser frequency stabilization, and has good transmission performance, low cost, high scalability, and can be widely used in laser frequency stabilization technical field.

Medical diagnostic devices and related methods of use are described in which a sensor coil may be connected with a resistive, inductive, and capacitive (RCL) circuit including a power meter and a frequency counter, and the sensor may be positioned on a chest of a subject. The sensor apparatus may apply an alternating current through the sensor coil. The sensor apparatus may measure parallel resistance values in the sensor coil using the power meter for a time interval while the subject inhales and exhales. The sensor apparatus may record the parallel resistance values. The sensor apparatus may determine a first change in the parallel resistance values by measuring a difference between a crest and a trough of the parallel resistance values, wherein the crest of the parallel resistance value corresponds to the inhale and the trough of the parallel resistance value corresponds to the exhale of the subject's breath.

The utility model discloses a safety tongs reliability detection tool, and relates to the field of elevator braking, and the safety tongs reliability detection tool comprises a test plate, an electromagnet is installed on the test plate, the lower end of the electromagnet is connected with a movable plate, a limiting block is installed at the lower part of the electromagnet on the test plate, and the inner side of the limiting block is provided with a moving groove. A mounting groove is formed in the position, located in the moving groove, of the inner side of the limiting block, a guide rail is arranged in the mounting groove, a transverse moving groove is formed in the lower portion of the movable plate, a limiting bolt is movably installed in the transverse moving groove, and the movable plate is connected with a brake roller through the limiting bolt. Rapid braking can be carried out through friction force between the brake roller and the guide rail; the electromagnet can be controlled to be quickly powered on and powered off through the control case, the power-on and power-off frequency counter can record the power-on and power-off frequency and is used for knowing the overall service life, and the execution frequency of quick braking and the braking effect can be known through the first execution frequency counter and the second execution frequency counter.

A device includes a temperature-variable voltage controller, in which the temperature-variable voltage controller comprises: a voltage regulator; a process monitor circuit coupled to the voltage regulator, in which the process monitor circuit includes a ring oscillator, and a frequency counter coupled to an output of the ring oscillator; and a temperature-variable current source coupled to the voltage regulator so that, during operation, the output voltage of the voltage regulator is compensated based on a change in temperature of the temperature-variable current source.

The invention provides a quantum frequency angle gauge based on Littrow type grating frequency selection, which comprises a laser generating device, a first half-wave plate (9), a polarization splitting prism (11), a photoelectric detector (12) and a frequency counter (13), a horizontal rotating table (3) is arranged on a light path between the laser generating device and the first half-wave plate (9), a plane mirror (5) and a diffraction grating (6) are arranged on the horizontal rotating table (3) in parallel, and the diffraction grating (6) is arranged on the plane mirror (5). A second half-wave plate (10) and an optical frequency comb (8) are arranged on the other light path of the polarization splitting prism (11); and when the horizontal rotating table (3) rotates to cause the frequency change of the measured laser, the variable quantity of the beat frequency is equal to that of the measured laser. According to the quantum frequency angle gauge based on Littrow type grating frequency selection, the angle measurement resolution limit of the quantum frequency angle gauge reaches 0.00001 ''magnitude, and the application requirements of various kinds of ultra-precise angle measurement can be met.

The present invention discloses an analysis method for polar quartz crystal liquid phase measurement, and relates to the field of polar quartz crystal liquid phase measurement. The present invention comprises the steps of connecting the polar quartz crystal to be measured to a circuit, controlling an alternating voltage across an air gap to drive the crystal to oscillate; collecting resonance waves and processing output signals; adjusting the analysis environment settings of the polar quartz crystal, recollecting resonance waves to process output signals; obtaining a frequency counter to measure frequency changes, and calculating the mass of QCM adsorbents. The present invention realizes stability measurement of the crystal to be measured and improves measurement accuracy through the design of analog modules and component types.

The invention discloses a movable E-15 magnitude ultra-stable laser comparison test system, which relates to the technical field of optical metrology and comprises a PDH laser frequency stabilization unit, a beat frequency unit, matched test equipment and a computer. An output optical signal of a to-be-tested PDH system is directly connected to a beat frequency module in a cabinet, beat frequency is carried out on the output optical signal and original PDH laser of the cabinet in the beat frequency module, a radio frequency signal obtained after beat frequency can be respectively accessed to a frequency counter and a frequency spectrograph, and a signal processed by the frequency counter and the frequency spectrograph can be accessed to a computer. And finally, indexes such as frequency stability and line width can be directly read through a software control end of a computer.

Aspects of the disclosure are directed to voltage sensing for safety-critical applications. In accordance with one aspect, the disclosure includes a multi-phase ring oscillator (RO) configured to operate in a first voltage domain; a frequency counter coupled to the multi-phase RO, the frequency counter configured to accumulate a plurality of phase cycles from the multi-phase RO over a time duration to generate a digital count word; an alarm processor coupled to the frequency counter, the alarm processor configured to receive an alarm state signal from the frequency counter; and a heartbeat detector coupled to the multi-phase RO, the heartbeat detector configured to operate in a second voltage domain and configured to detect a periodic recurrence of a heartbeat pulse to determine an integrity of the sensor function as a whole and alarm state signal in particular.

The embodiment of the invention discloses a frequency locking loop and a control method thereof, and the frequency locking loop comprises a numerical control oscillator which is configured to generate a corresponding target frequency signal based on a target control signal, and control a loop control switch to execute a corresponding action based on the frequency signal; the high-frequency counter is configured to count the numerical control oscillator to obtain an actual count value; an ideal count value unit configured to generate an ideal count value within a preset time window; the frequency identification unit is configured to judge whether the difference value between the actual count value and the ideal count value meets a preset difference value threshold value or not; and the frequency regulation control unit is configured to generate a target control signal based on a preset difference threshold value if the judgment result is satisfied, so as to control the numerical control oscillator to generate a target frequency signal. According to the frequency locking method and device, the technical problems that in the prior art, power consumption is large and the locking speed is low when frequency locking is carried out are solved.

The invention discloses a sensor overturn compensation method, system and device based on range prediction, and a storage medium. The method comprises the following steps: configuring a range upper limit threshold and an upper / lower limit threshold according to a sensor model; receiving a data message containing an accumulated value, a message ID and a timestamp; performing repeated judgment by comparing the message ID with the timestamp; if the message is not repeated, performing smooth filtering on the accumulated value, then performing trend analysis in combination with sliding window statistics, and when a transition mode from a continuous high order to a continuous low order is detected, judging overturning; updating a turnover frequency counter of the sensor, and calculating a real accumulated value after compensation according to the turnover frequency, the upper limit of the measuring range and the current accumulated value; and finally updating the cache state. According to the invention, automatic and accurate detection and real-time compensation of data overturning of the accumulation type instrument are realized, and the automation level, accuracy and reliability of data processing are effectively improved.

A semiconductor device includes: an oscillator circuit including a plurality of logic gate groups connected in series; a frequency counter measuring an oscillation frequency of the oscillator circuit; and a comparator comparing a reference value and the oscillation frequency of the oscillator circuit measured by the frequency counter. Each of the logic gate groups includes first to third logic gates each made of a transistor and connected in series. A first fan-out number of the first logic gate is larger than a second fan-out number of the second logic gate and the third logic gate. The first to third logic gates have the same driving force from one another.

Medical diagnostic devices and related methods of use are described in which one or multiple coils in a sensor, each coil connected with an RLC circuit and frequency counter, are held against a patient's head at predetermined cranial locations. Frequencies of the RLC circuit are measured and compared against those taken from known, control heads, to determine whether there is a medical problem and what type of problem. In some instances, too high of frequencies can reveal pooled blood in the head, a sign of hemorrhagic stroke, while too low of frequencies imply lack of blood supply, a sign of ischemic stroke. A head-mountable frame can assist a first responder in securing and guiding the coils and, along with fiducials, allow for automatic comparison of frequencies with the correct control data.

The embodiment of the invention provides a crystal oscillator single event effect test system. In one specific embodiment, the system comprises a vacuum target chamber, a digital power supply, a digital switch controller, a test terminal and a frequency counter, the vacuum target chamber provides a vacuum environment for the plurality of crystal oscillators to be tested; a particle beam line is arranged in the vacuum target chamber; the test terminal controls gating of the digital switch controller, so that the digital power supply supplies power to the gated crystal oscillator to be tested through the digital switch controller, and the frequency counter collects the output frequency of the gated crystal oscillator to be tested; and the test terminal is also used for controlling the particle beam line to radiate the plurality of crystal oscillators to be tested respectively, acquiring the output current acquired by the digital power supply and the output frequency acquired by the frequency counter, and identifying and recording a single event upset event and a single event locking event of the gated crystal oscillators to be tested according to the output current and the output frequency.

The invention provides a batch test device for crystal oscillators, and the device comprises a vacuum tank body which is used for providing a crystal oscillator test environment; the crystal oscillator batch test plate is positioned in the vacuum tank body and is used for bearing and fixing a plurality of crystal oscillator samples to be tested; the stabilized voltage supply and the frequency counter are positioned outside the vacuum tank body; a power adapter and a signal adapter are arranged on the vacuum tank body; the crystal oscillator batch test board is connected with a power line and a signal line which are used for being electrically connected with a to-be-tested crystal oscillator sample. The power line is led out of the vacuum tank body through the power adapter, and the signal line is electrically connected with the signal adapter; the voltage-stabilized power supply is led out of one end outside the vacuum tank body through a connecting power line to supply power to a crystal oscillator sample to be tested on the crystal oscillator batch test board; and the frequency counter is connected with the signal conversion head so as to acquire an output frequency signal of a crystal oscillator sample to be tested on the crystal oscillator batch test board. The testing device can save the testing time, reduce the opening times of the vacuum tank body and improve the testing efficiency.

The embodiment of the application discloses a flow probe high-precision time detection system, method, equipment and medium, the system comprises: a flow probe, a first frequency counter, a second frequency counter and a B code signal source, wherein: the B code signal output end of the B code signal source is connected with the B code signal input end of the flow probe; the 1PPS signal output end of the B code signal source and the 1PPS signal output end of the flow probe are connected to channel A and channel B of the first frequency counter respectively; and the 1MHz signal output end of the B code signal source and the 1MHz signal output end of the flow probe are connected to channel A and channel B of the second frequency counter respectively.

The invention relates to the technical field of lasers, in particular to a frequency stabilization method with a real-time frequency monitoring function and a laser structure, the frequency stabilization method adopts a frequency stabilization device, and the frequency stabilization device comprises a laser, an optical fiber beam splitting module, a frequency stabilization module, a beat frequency module, a beat frequency signal monitoring unit and a frequency counter; the optical fiber beam splitting module comprises a first optical fiber beam splitter and a second optical fiber beam splitter. The frequency stabilization method is realized based on the frequency stabilization device, and in the frequency stabilization process, through cooperation of the frequency stabilization module, the beat frequency module, the beat frequency signal monitoring unit and the frequency counter, on the basis of realizing closed-loop locking of the laser frequency, the frequency stabilization efficiency is improved. According to the frequency stabilization method, the key quantitative index of the laser frequency stability can be displayed in real time without any external expensive equipment, the frequency stabilization state is visualized, and meanwhile, a path of beat frequency signal is reserved to meet the deep analysis requirement of a user, so that the implementation cost and the implementation difficulty of the frequency stabilization method are relatively low.

The invention provides a reference position calibration method for a reflective photoelectric encoder. The device is characterized by comprising a coded disc (1), a photodiode array (2), a quaternion amplification circuit (3) and a position identification circuit (4). Wherein the photodiode array (2) is composed of an incremental code channel signal photodiode array (21) and a zero code channel photodiode array (22), and the position identification circuit (4) is composed of an AD conversion circuit (41), a latch circuit (42), an XOR circuit (43), a high-frequency counter circuit (44) and a digital comparison circuit (45). The method can be applied to reference position calibration of the reflective photoelectric encoder, and can be widely applied to the fields of industrial production, aerospace, medical treatment, precise instruments, experimental scientific research, numerical control machine tools and the like.

The invention discloses a method and device for constructing a 425nm wavelength reference based on induced fluorescence effect, which relates to the field of transition frequency measurement. The device includes a continuously tunable laser, an atomic furnace, a chromium atomic beam, an optical frequency comb, a frequency doubling optical path, a polarization-maintaining optical fiber beam splitter, a polarization-maintaining optical fiber beam combiner, a beat frequency detection optical path, a photoelectric receiver and a frequency counter; the output end of the continuously tunable laser is connected to the input end of the polarization-maintaining optical fiber beam splitter; the output end of the optical frequency comb is connected to the frequency doubling optical path; the frequency doubling optical path and the first output end of the polarization-maintaining optical fiber beam splitter are respectively connected to the input end of the optical fiber beam combiner; the chromium atomic beam is ejected through the atomic furnace and acts on the second output end of the polarization-maintaining optical fiber beam splitter; the output end of the polarization-maintaining optical fiber beam combiner is connected to the input end of the beat frequency detection optical path; the output end of the beat frequency detection optical path is connected to the input end of the frequency counter through a photoelectric receiver. This method fills the gap in the wavelength reference of the blue-violet light band.

1. Name of the product in this design: Frequency Counter. 2. Purpose of this design: An instrument for measuring and displaying frequency parameters. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1. 5. Other situations requiring explanation: Section A is the display screen.

The invention relates to a sulfur hexafluoride online mixing ratio density detection and dual-check sensor, and belongs to the technical field of gas detection. According to the sensor, the mixing ratio and density of SF6 gas are detected by utilizing the physical characteristics of the piezoelectric effect of the quartz crystal. The sensor comprises a QCM detection unit, a dual-verification unit, a data processing unit, a communication unit and a power supply unit, the QCM detection unit is constructed by utilizing the physical characteristics of the piezoelectric effect of a quartz crystal, and the QCM detection unit comprises a quartz crystal resonator, an electrode, a gas detection chamber and a frequency counter. According to the invention, real-time and accurate detection of the mixing ratio and density of SF6 gas and air or other gases can be realized; moreover, through a unique dual-verification mechanism, detection errors caused by various factors in a long-term operation process of the sensor are effectively eliminated, high reliability of a detection result is ensured, and a solid technical support is provided for safe and stable operation of power equipment and precise control of an industrial production process.

A method for learned image compression implemented in an autoencoder includes: a) extracting from an image a latent space by the learnable encoder; b) quantizing the latent space by a quantizer to obtain a quantized latent space; c) entropy coding the quantized latent space by an entropy encoder to obtain a bitstream, wherein an entropy model used to encode the latent space is represented by a probability distribution; d) entropy decoding the bitstream by an entropy decoder to obtain an entropy decoded bitstream; e) feeding the entropy decoded bitstream to the decoder; f) recover a reconstructed image by the decoder; g) training the autoencoder via standard gradient descent of the backpropagated error gradient by finding learnable parameters of the learnable encoder and of the decoder that minimize a rate distortion cost function, wherein the entropy encoder is based on a differentiable formulation of a soft frequency counter.

Provided is a development support device capable of obtaining a total number of steps of a load, a required time when a program is executed is predicted. The development support device of the embodiment is a development support device that supports development of a program including a function block. The development support device of the embodiment includes a step counter that counts a number of execution steps of the function block indicating a number of processes executed in the function block, a frequency counter that counts a number of times of use of the function block used in the program, and an arithmetic unit that calculates a product of the number of times of use of the function block and the number of execution steps of the function block, and outputs the number of execution steps of the function block in the program.

The invention provides a digital high-voltage power supply suitable for an electric propulsion system. The digital high-voltage power supply comprises an FPGA, a high-voltage power supply, a phase-shifted full-bridge power module, a feedback measurement module and an A / D sampling module, wherein the FPGA adopts two frequency counters to realize the control of four switch tubes; determining a control time sequence of a leading arm and a lagging arm according to the MOS turn-on holding time T1, the switching tube driving period T, the dead time t and the phase shift time delta; and starting a corresponding frequency counter cnt1 when the leading arm is set and conducted, starting a frequency counter cnt2 when the phase shifting time is reached, immediately starting a lagging arm, and then setting or zeroing corresponding switch tube driving signal waveform control when the counts of the cnt1 and the cnt2 reach corresponding count values according to a control time sequence. The control time sequence is realized based on the cooperation of the two counters, the digital-based high-voltage power supply control is realized on the basis of using fewer FPGA resources, the stability is good, and the reliability is high.

The invention discloses a calibration device and method for self-keeping time of a positioning and orientation test system, and the method comprises the steps: connecting a second pulse signal generated by a second pulse signal generation circuit of a Beidou / GPS receiver unit of the positioning and orientation test system to a signal input terminal Vi1 of an adapter; a signal output terminal Vo1 of the adapter is connected with an input end of a channel CH1 of the waveform recorder; a second pulse signal A2 generated by a second pulse signal generation circuit of the self-keeping time unit is connected to a signal input terminal Vi2 of the adapter and is respectively connected with a channel CH2 input terminal of the waveform recorder, a channel 1 input terminal of the general frequency counter / timer and an external trigger input terminal; a 2.5 ms time base signal A3 generated by the self-punctuality time unit is connected to a signal input wiring end Vi3 of the adapter and is connected with the input end of a channel CH3 of the waveform recorder; the problem that the self-keeping time starting point is difficult to capture and the self-keeping time cannot be measured in the prior art is solved.