19 results about "Digital algorithm" patented technology

The invention provides a temperature control system and method, electronic equipment and a storage medium, and relates to the technical field of semiconductor laser temperature control. The temperature control system is used for the vertical-cavity surface-emitting laser, and comprises a temperature measurement assembly which is used for measuring the real-time temperature of the vertical-cavity surface-emitting laser and providing a feedback signal; the digital PID algorithm assembly is connected with the temperature measuring assembly and is used for determining a control signal according to the feedback signal and a set temperature; and the power driving assembly is connected with the digital PID algorithm assembly and is used for providing driving current according to the control signal so as to adjust the temperature of the vertical cavity surface emitting laser. According to the invention, a four-wire system wiring method is adopted to eliminate lead resistance errors, and a high-precision element is matched, so that the temperature detection precision reaches 2mK, and the accuracy is remarkably improved.

The various implementations described herein include techniques and apparatuses for multi-channel biopotential signal acquisition, biopotential signal pre-processing, and adaptive signal conditioning. In one aspect, an apparatus is provided for adaptive signal conditioning for biopotential acquisition. The apparatus includes an analog circuit configured to amplify biopotential signals, and a mixed-signal circuit (e.g., which can include an adaptive digital algorithm) coupled to the analog circuit and configured to suppress aggressor signals such as baseline wandering signals and power-line-induced noise in the biopotential signals before amplification of the biopotential signals.

The application discloses a kind of multi-modal flexible sensor adaptive signal conditioning system design method, belong to flexible sensor signal conditioning technical field.The present application overcomes the defects of poor universality, performance compromise, high cost of mass production of existing conditioning circuit, adopts layered decoupling and dynamic reconstruction system-level architecture: through multi-modal feature analysis and demand mapping modeling, the feature vector composition of scene recognition is determined;Design configurable analog front end, integrate instrument amplifier, transimpedance amplifier, charge amplifier, bridge amplifier four parallel processing sub-modules, wherein charge and bridge amplifier adopt self-designed architecture with dynamic adaptive gain adjustment capability;Build heterogeneous digital processing platform with NPU, CPU, DSP as core, through cross-modal data fusion, scene recognition engine, dynamic hardware configuration combined with feedforward and feedback, loadable algorithm library and closed-loop optimization control law, realize the real-time scene reconstruction of hardware parameters and digital algorithm;Combined with domestic single-chip selection, rigid-flex PCB and automatic calibration, meet the demand of low-cost mass production.The present application realizes the native adaptation and performance optimization of single hardware platform to voltage, current, charge, impedance and other types of sensor signals, and can be widely applied in robot dexterous hand, medical monitoring, intelligent bandage, consumer motion monitoring and industrial monitoring fields.

The invention discloses a laser collimation measurement system and method for a digital compensation light drift angle, and belongs to the technical field of precision measurement, and the system comprises a laser output unit, a collimating lens, a light drift angle measurement unit, a straightness measurement unit, a two-dimensional angle measurement unit and a signal processing unit. The light drift angle measuring unit measures the light drift angle through a light retroreflector, a lens and a photoelectric detector, the straightness and two-dimensional angle measuring unit obtains original measuring signals through an optical splitter and the photoelectric detector, and the signal processing unit receives signals of all the photoelectric detectors. And calculating a real straightness error and a real angle error of the measured object, and performing digital compensation on a measurement error caused by a light drift angle. Through one-way optical path design, common-path compensation and a digital algorithm, the influence of the light drift angle on the measurement precision in long-distance measurement is effectively suppressed, and the method is suitable for high-precision geometric error measurement of large equipment such as a gantry machine tool.

The application discloses a kind of MZM array bias point control method and circuit based on high harmonic suppression, it is related to circuit control technical field, comprising the following steps: S1, generate low-frequency sinusoidal signal, after processing, load to MZM array;S2, the optical signal output to MZM array is preprocessed;S3, the optical signal after preprocessing is sampled, and the amplitude spectrum in frequency domain is obtained;S4, according to the amplitude spectrum in frequency domain, calculate harmonic ratio;S5, based on harmonic ratio, the corresponding direct-current bias voltage is output, the locking of bias point is realized.The application uses digital FFT algorithm to replace expensive analog demodulation circuit, while ensuring high performance, substantially reduce hardware cost and PCB area, conducive to engineering batch application.

The invention relates to the technical field of chip test and calibration, and discloses a chip calibration method and system based on a temperature shock mechanism. The chip calibration method is applied to chip full-temperature calibration equipment, and specifically comprises the following steps: S101, acquiring a chip calibration request of an upper computer to construct a temperature shock environment to complete adjustment, then performing temperature shock circulation, and in the temperature shock process, arranging a high-precision thermocouple array in the chip full-temperature calibration equipment, the actual temperature of the packaging surface of the chip is monitored in real time, and data are uploaded to the upper computer; and S102, a delta sigma-ADC circuit is adopted to capture analog parameters at a sampling rate of 100 thousand times per second, and an instantaneous error is calculated through a digital algorithm circuit. The problem of full-temperature-range nonlinear error compensation in traditional calibration is solved, the timing precision is controlled within 5 ppm, the adaptive range of the communication baud rate is expanded to 960 bps to 460 Kbps, and the parameter stability of a military level chip in an extreme environment is remarkably improved.

The application discloses a high-frequency digital phase-locked amplifier based on a parallel digital algorithm and a control method. The amplifier comprises an analog-to-digital converter module, a serial-to-parallel module, an N-parallel frequency measurement module, an N-parallel phase-locked loop module and an N-parallel input coherent demodulation module. The method comprises the following steps: obtaining an analog input signal and a reference signal and performing sampling processing; performing serial-to-parallel conversion processing on the sampled digital input signal and the digital reference signal; performing frequency measurement on the N-parallel digital reference signal to obtain reference signal frequency measurement information; performing phase-locked regulation on the N-parallel digital reference signal to obtain frequency information and phase information; and performing demodulation processing on the N-parallel digital input signal to obtain amplitude information, phase information and XY component information of the digital input signal. The embodiment of the application can reduce the rate of data flow and improve the throughput of data information, thereby improving the bandwidth of the phase-locked amplification system. The application can be widely applied to the technical field of phase-locked amplification.

The invention discloses a two-dimensional plate opening method for a complex curved surface panda stuffed toy based on a parameterized model. The method comprises the following steps: constructing a parameterized design system taking the head circumference of the toy as a reference centimeter; based on the reference centimeter, coordinates, line segment lengths and angles of all key positioning points of the head film, the chest film and the back film are calculated through a plurality of preset proportionality coefficients, and the proportionality coefficients are multiples or scores of the reference centimeter; performing geometric drawing according to the coordinates, the length of the line segment and the angle, and connecting the key points by using an arc line to form a net template with a complex curved surface; and externally placing a seam allowance on the basis of the net template to generate a wool template. According to the two-dimensional plate opening method, a digital algorithm is adopted, the toy is made to be high in accurate restoration image degree, the head proportion of the panda, the curvature radian of parts and other characteristics are accurately controlled through the digital algorithm, the size is adjusted in a parameterized mode, the plate making accuracy is improved, the loss of sample making materials is reduced, and the labor-hour cost is reduced.

The invention discloses a privacy protection camera based on an optical engineering scattering sheet and a privacy protection method thereof.The privacy protection camera comprises a camera module, the camera module is provided with the engineering scattering sheet, the engineering scattering sheet is made of POG materials, the divergence angle of the engineering scattering sheet is 1 + / -0.5 degrees, the light transmittance of the engineering scattering sheet is larger than 85%, and the light transmittance of the engineering scattering sheet is larger than 90%. The POG material comprises a glass substrate and surface polymer micro-lens array layers, the surface polymer micro-lens array layers are randomly distributed, and the height difference is 0-2 [mu] m; according to the invention, no complex algorithm is needed, sensitive detail blurring is realized through optical regulation and control of the engineering scattering sheet, and the cracking difficulty is far higher than that of a digital algorithm; through controllable scattering, only details are fuzzy, and overall contour and action recognition is not affected; the circular defocused spots ensure uniform diffusion of facial details, the diffusion angle is controllable, and privacy and recognition requirements can be balanced; the POG material structure combines the high stability of the glass and the microstructure precision of the polymer, the light transmittance is greater than 85% and is better than that of ground glass which is less than 70%, and the glass has no deformation after long-term use.

The invention relates to the technical field of external diagnosis equipment, in particular to an optical signal processing circuit for a hematology analyzer. Comprising a light source driving monitoring module, a sheath flow control circuit module, a photoelectric detector, a transconductance amplifier, a low-noise amplifier, a buffer, a high-gain amplifier, a low-gain amplifier, a first gain adjusting unit, a first filter, a first analog-to-digital converter, a second gain adjusting unit and a second filter. A second analog-to-digital converter and a programmable gate array / digital processing unit; a high-low gain dual-channel multi-stage amplification and signal processing technology is adopted, so that weak optical platelet signals can be effectively captured, amplified and processed; and correct counting of medium and large volume cells such as red blood cells and white blood cells can be ensured. The circuit can automatically adjust the gain multiple value of the amplifier in a test, identifies various cell signals between two channels through a digital algorithm, and has good accuracy and precision in a whole blood cell test.

The invention discloses a pedestrian detection-oriented physical adversarial patch generation and migration method, and belongs to the field of computer vision and artificial intelligence security. The invention provides a shape-texture two-stage layered optimization and Min-Max robust migration framework aiming at the problems of abrupt patch shape, difficulty in reproduction of pixel-level noise and poor environmental adaptability in the existing physical countermeasure attack. The method comprises the following steps: firstly, constructing a smooth patch contour by using a centripetal Catmull-Rom spline curve, and optimizing an anchor point coordinate through a differential evolution algorithm so as to lock an effective receptive field which is most sensitive to a model; secondly, constructing a discrete texture coding space based on a physical adhesive tape, and searching an optimal stripe texture formed by the color, width and direction of a standard adhesive tape in a fixed shape; meanwhile, a Min-Max robust optimization strategy is introduced, and the anti-interference capability of the patch is improved by minimizing the maximum confidence coefficient under the worst illumination transformation; and finally, a physical mapping strategy based on vector reconstruction is adopted, a precise transformation model from pixels to millimeters is established, and an SVG vector manufacturing file irrelevant to resolution is output. According to the method, precise closed loop of the anti-patch from digital algorithm optimization to physical object manufacturing is realized, and the method has the advantages of high physical realizability, natural and hidden shape, high environmental robustness and the like.

This invention discloses a method and system for synthesizing multi-channel nonlinear phase signals. The method includes: controlling multiple channels to acquire data sequentially by frequency; controlling a two-to-one switch to switch to a calibration signal source and simultaneously sending a signal to multiple channels; obtaining the precise frequency offset of each channel and calculating the frequency position of the synthesized signal in the baseband; obtaining the precise time difference and amplitude difference of each channel; calculating and writing the mixing cosine and sin phase values ​​into memory based on the frequency position of each channel in the synthesized baseband; controlling the two-to-one switch to switch the antenna to receive the real signal; performing calculations on each channel based on the preprocessed offset values, and merging the processed channel data into a single signal. This solution does not rely on complex hardware design to achieve high-precision time or frequency control, and can achieve rapid synthesis of multiple signals at low cost through digital algorithms.

The present invention discloses a system for entangling multiple root keys with multiple arbitrary user-defined and self-generated input data using a Physically Unclonable Function (PUF) and a proposed digital algorithmic system. The key innovation lies in the combination of a PUF-based dynamically measurable entropy source and the proposed invention, enabling the generation of multiple true random keys. These keys serve as a secure foundation for establishing cryptographic channels, allowing the creation of isolated secure channels for different stakeholders and applications. The ability to create isolated secure channels with multiple root keys enables the establishment of multiple roots of trust, enhancing the integrity and security of cryptographic operations. The invention finds applications in various domains, such as FIDO authentications, point-to-point encryptions, crypto wallets, and encryption key management systems.

A method for digitally detecting the number of suspended particulates includes: providing a particulate sensor, which includes an airflow channel, a micropump, a laser emitting component, and a photodiode (PD). The micropump introduces air containing suspended particulates into a measurement area. The laser emitting component emits a laser beam toward the measurement area at an orthogonal point, thereby generating scattered light. The photodiode senses the scattered light and converts it into an electrical signal. Then, the photodiode uses a built-in digital algorithm to divide the electrical signal into N energy intervals. The number of particles is recorded in each interval, and the number of particles is recorded in each digitally calibrated distribution interval, forming a fine data distribution. Data processing and cumulative data calculation are then performed to determine the particle size, total number of particles, and concentration of suspended particulates for each particle size range (below PM1, PM2.5, and below PM10).

The invention provides a low-voltage AGC (Automatic Gain Control) circuit for an inductance encoder. The device is characterized by comprising a sine channel PreAmp (1), a cosine channel PreAmp (2), a sine channel dB linear amplifier (3), a cosine channel dB linear amplifier (4), a phase difference circuit (5), a vector amplitude synthesis circuit (6), a quantization circuit (7), a digital algorithm circuit (8), a sine channel output buffer (9) and a cosine channel output buffer (10). According to the invention, an innovative full-simulation vector amplitude synthesis circuit is adopted to replace a traditional switched capacitor scheme, so that the technical bottleneck that the signal amplitude cannot be accurately detected in a low-voltage environment is successfully overcome, and the AGC system can stably work and accurately control the output amplitude at the low voltage of less than or equal to 3.3 V. In combination with a wide dynamic range brought by a dB linear amplifier and precise control of a digital intelligent algorithm, the circuit finally provides a complete low-voltage solution with high response speed, ultrahigh amplitude stability and excellent anti-interference capability for an inductance encoder, and is particularly suitable for low-power-consumption scenes such as portable equipment and the Internet of Things.

The application provides a temperature measurement method, device and circuit. The method is applied to a digital algorithm module in a temperature measurement circuit, and includes the following steps: taking a preset digital code word as a current digital code word, transmitting the current digital code word to a digital-to-analog converter, controlling the digital-to-analog converter to input a reference voltage to a second input end of a comparator, and making the comparator determine a current output level of an output end according to the reference voltage and a voltage difference received through a first input end; receiving the current output level transmitted by the comparator, adjusting the current digital code word by using a dichotomy method, continuing to perform a subsequent process of controlling the reference voltage based on the adjusted current digital code word, until the current digital code word and a decimal number corresponding to a last digital code word are different by one and a comparator output level corresponding to the current digital code word is different from a comparator output level corresponding to the last digital code word, and determining a temperature detection result of a region where a triode is located based on the current digital code word and / or the last digital code word. The circuit structure is simplified, the area is reduced, and the temperature detection performance is stable.

The invention relates to a multi-modal data fusion cupping therapy real-time monitoring and closed-loop regulation and control system, which belongs to the technical field of medical instruments and comprises a data acquisition module, a data processing module, a man-machine interaction platform and a control module. The negative pressure, subcutaneous tissue blood oxygen parameters and body surface morphological changes in the cupping process are monitored in a non-invasive mode in real time, the data processing module calculates the hemoglobin concentration, the blood oxygen saturation degree and the hyperemia index in real time and conducts multi-modal data fusion analysis in combination with fuzzy logic, and the control module dynamically adjusts the power of an air pump through an incremental digital PID algorithm. According to the system, the safety, consistency and reliability of treatment can be improved, the dependence on the experience of an operator is reduced, and data support is provided for curative effect evaluation and personalized treatment.

The invention relates to the technical field of laser frequency stable control, precise spectral measurement and optical metrology, and discloses a common-cavity double-optical-comb repetition frequency difference locking method and related equipment. Acquiring two paths of repetition frequency signals of the double-optical-comb mode-locked laser and performing digital processing to obtain an actual frequency value; calculating a control error between the actual frequency difference and a preset target value, and outputting a digital control quantity through a digital algorithm module; the resonant cavity length of the laser is fed back and adjusted, and the long-term drift of the frequency difference is inhibited; and monitoring a control signal and an error in real time, and executing reset relocking when a safety threshold value is exceeded or a lock is lost. According to the invention, the problem of repetition frequency difference long-term drift caused by slow factors such as environment temperature drift, mechanical disturbance and device aging is solved.