33 results about "Input capture" patented technology

The invention relates to the technical field of sensing, and discloses a capacitive touch screen input event classification and processing system which comprises an input capture module, an event classification module, an intention prediction module, a dynamic response module, an energy efficiency optimization module and a multi-channel cooperation module. When an input event of the capacitive touch screen is identified, a dynamic noise suppression model is established, and adaptive filtering strategies are configured for different use scenes, so that the reliability of signal analysis in various electromagnetic interference environments is ensured, and meanwhile, the spatial and temporal distribution characteristics of capacitance variation are analyzed in real time; real touch operation and environmental electromagnetic noise can be effectively distinguished, the identification fidelity of basic operations such as clicking and sliding is ensured, the false triggering rate is reduced, the operation accuracy in a weak signal scene is improved, and when multi-finger operation is detected, the consistency of contact coordinates in a curved surface state and a plane state is maintained, so that the accuracy of the touch operation is improved. And the track continuity of writing and drawing type fine operation is ensured.

The invention relates to sensor system arrangements and configurations. In particular, the invention provides methods, devices, systems and computer program products for integrating, compositing and / or processing data representing a measurable state within a region-of-interest, that has been received from a plurality of sensors that respectively have different input sensitivities, spectral sensitivity ranges and / or input capture ranges.

The application belongs to the technical field of vehicle communication, and specifically provides a CAN bus baud rate self-adaptive method, a terminal and a storage medium, which comprise updating a pin multiplexing module configuration, connecting a message receiving pin of a master control chip MCU with an input capture module in the master control chip MCU, initializing the input capture module, and setting a clock frequency to measure the pulse width of a current CAN pulse signal; according to a preset baud rate matching table, the upper and lower limits of the pulse width corresponding to each baud rate and the overall upper and lower limits are calculated; by directly measuring the pulse signal width on the CAN bus and combining the preset baud rate matching table, the application can quickly narrow the baud rate search range, reduce the number of unnecessary attempts, thereby significantly shorten the time required for the self-adaptive process, and improve the system startup speed and response capability.

The application discloses a synchronization method for servo communication and motor control of an EtherCAT bus, which comprises the following steps: a mapping relationship between a control period of an auxiliary timer and a PWM signal generator is established, and a physical synchronization signal Sync0 of the EtherCAT bus is mapped as an external trigger source of an input capture unit; when a valid jump edge of the physical synchronization signal Sync0 is detected, the current instantaneous count value of the auxiliary timer is locked into a capture register by the input capture unit without intervention of a software interrupt, so as to form a reference time stamp; the reference time stamp is read in an interrupt service of a servo control period, a phase offset is calculated based on a target phase relationship between the reference time stamp and the physical synchronization signal Sync0, and the reloading value of the PWM signal generator in the next control period is dynamically modulated according to the phase offset.

The invention belongs to the technical field of avionics, and provides an inductive proximity sensor resolving system and method based on a low computing power platform, and the system takes an embedded microcontroller which is not provided with a floating point coprocessor or cannot execute a DFT algorithm in real time as a main control module. The inductance measuring module is formed by connecting an inductance type proximity sensor and a reference resistor in series; the signal generating and conditioning module is used for providing a sine constant-voltage excitation signal; two paths of input of the zero-cross detection module are respectively connected with an excitation signal end and a node between the sensor and the reference resistor, and output of the zero-cross detection module is connected with an input capture pin of the main control module; the input of the effective value detection module is connected with two ends of the sensor, and the output is connected with the analog input pin of the main control module. The system directly calculates the inductance value through a time domain amplitude phase fusion model, does not need frequency domain transformation, remarkably reduces the requirement for the MCU computing power, and is suitable for safety key scenes such as undercarriage position detection and the like.

The invention relates to the technical field of electric energy metering and communication, and discloses an efficient electric energy meter multi-Mcu data synchronization method, which comprises the steps that a master control MCU generates a PWM addressing signal matched with a preset identity feature of a target metering core and broadcasts the PWM addressing signal; the metering core analyzes the signal through an input capturing unit, and if the signal feature is matched with the preset identity feature of the metering core, the metering core is activated; the activated metering core sends a data frame through a shared data bus constructed based on a collector open circuit in an exclusive reporting time window; and the main control MCU receives the data frame and completes acquisition and management. According to the invention, the PWM frequency and the duty ratio are used as the composite identity identification, broadcast addressing can be realized without independent chip line selection, and a hardware circuit is simplified; by combining a time window mechanism of time domain isolation and line and logic, the problem of data conflict reported by multiple slaves is solved, and the stability and acquisition efficiency of the system are improved.

The invention discloses a synchronization method for servo communication and motor control of an EtherCAT bus, and the method comprises the steps: building a mapping relation between an auxiliary timer and a control period of a PWM signal generator, and mapping a physical synchronization signal Sync0 of the EtherCAT bus into an external trigger source of an input capture unit; when an effective jump edge of a physical synchronization signal Sync0 is detected in response, an input capture unit is used for locking a current instantaneous count value of an auxiliary timer into a capture register in real time under the condition that software interruption intervention is not carried out, and a reference timestamp is formed; the method comprises the steps of reading a reference timestamp in an interrupt service of a servo control period, calculating a phase offset based on a target phase relationship between the reference timestamp and a physical synchronization signal Sync0, and dynamically modulating a reloading value of a PWM signal generator in a next control period according to the phase offset.

The method and system improves upon standard user interaction by supplementing user interfacing and computer operations based on dynamic analysis of content including detecting a user capture a portion of the output via further user input from one of the plurality of input devices, a visual focus on the portion of the output. The method and system includes electronically processing the user capture to determine a content within the portion of the output within the visual focus and dynamically generate a secondary display element visible to the user as part of the output, the secondary display element including a user interface display for receiving additional user input including at least one input command. The method and system includes accessing at least one artificial intelligence processing system for performing a processing operation in response to the at least one input command and generating an updated output for the user.

A scrolling screenshot method and an apparatus, the method including displaying, by an electronic device, a first interface that displays a first part of a first page, receiving, by the electronic device, a first input, capturing the first part of the first page in response to the first input, scrolling, by the electronic device in a first direction for display, and capturing a second part of the first page, where the first part is adjacent to the second part, scrolling, after the electronic device captures the second part, by the electronic device, in a second direction, for display, and capturing a third part of the first page, where the second direction is different from the first direction, determining that a first condition is met. and synthesizing a target screenshot image in response, where the target screenshot image comprises the first part, the second part, and the third part.

Various embodiments are directed to apparatuses, methods, computer-readable media, computer program products, and systems related to simulated training and performance analysis. In some embodiments, the method may comprise causing, by one or more processors, display of real-time interactive media content to a user; receiving, by one or more processors, one or more audiovisual inputs captured in association with the user; causing, by one or more processors, the real-time interactive media content to interact with the user in real time by generating and displaying one or more audiovisual responses to the one or more audiovisual inputs; applying, by one or more processors, the one or more audiovisual inputs into a multimodal performance analysis engine to generate one or more performance analysis data objects; and generating, by one or more processors, one or more visual feedback interfaces based at least in part on the one or more performance analysis data objects.

System (100) for personalizing service interactions, wherein the system (100) comprises: an input capture module (104) configured to receive user input in at least one modality; a coding module (106); a multimodal embedding generation module (108) configured to generate cross-modal representations; a context analysis and intent inference module (110) configured to determine the user's intent and the context state; a response planning module (112) configured to generate a personalized response using generative artificial intelligence; an artificial intelligence analysis module (114) configured to generate interpretability information for the planned response; a review and validation module (116) configured to perform ethical and political validation; a response generation and delivery module (118) configured to produce a final multimodal response; and a feedback capture, learning and secure logging module (120) configured to update the system based on feedback.

The application discloses a nursing education traceable, interpretable and verifiable large model intelligent teaching assistant system and method, which comprises an input capture and semantic analysis module, a multi-source knowledge retrieval and versioned traceability module, an executable reference and piece-by-piece binding module, a causal evidence graph and structured explanation generation module, an evidence consistency and counterfactual stability verification module, and a replayable decoding and evidence storage module; the input analysis module generates a standardized problem template and risk level information; the knowledge retrieval and traceability module outputs a candidate evidence set with source segment fingerprints; the information binding module binds answer units and evidence fingerprints to generate reference mapping; the causal evidence graph module constructs a structured explanation graph; the multi-dimensional verification module performs logical consistency and counterfactual stability tests and outputs verification results; and the decoding and evidence storage module stores replayable decoding information. The application realizes answer segment level traceability, structured machine verifiable explanation and deterministic result replay through the construction of a modular system.

The purpose of the present invention is to facilitate model construction for identifying the position of an affected area based on an input captured image.　In a CPU of a physician terminal constituting an information processing system, when an operation reception unit 53 receives an operation for designating a region of an affected area included in a captured image of a part of a human body, the image being captured using a prescribed image-capture procedure, in a CPU 11 of a management server 1, a generation means 33 generates information about a change designation region obtained by changing a designation region designated by the received operation, and a learning unit 35 performs training in the generated information about the change designation region.

The invention relates to the technical field of ultrasonic motor testing, and discloses an ultrasonic motor rotating speed measuring system based on a TMR sensor, which comprises a standard motor assembly, a displacement table, the TMR sensor, a thermocouple and a single chip microcomputer. A synchronous port of the signal generator is connected with an input capture port of a timer of the single chip microcomputer, analog-to-digital conversion is started through hardware trigger signals, and the TMR sensor is synchronously sampled when the edge of a driving signal arrives. The single-chip microcomputer executes off-line calibration to construct a driving temperature rotating speed three-dimensional mapping model, reconstructs a signal base line by using temperature drift parameters during on-line measurement, predicts the rotating speed according to the model, dynamically sets the cut-off frequency of a band-pass filter, verifies the health degree in combination with multi-physical-quantity coupling, and generates a pulse sequence through self-adaptive hysteresis threshold logic to solve the rotating speed. According to the invention, software trigger time sequence jitter is eliminated, high-frequency electromagnetic interference and temperature drift are effectively suppressed, and the precision and robustness of non-contact rotation speed measurement are improved.

The application provides a wheel speed sensor jitter suppression method, system and device, and belongs to the technical field of sensor control. The wheel speed sensor jitter suppression method comprises the following steps: a hardware input capture module of a microcontroller is used to configure a double-edge trigger mode, to capture the rising edge and falling edge of a wheel speed square wave signal in real time and trigger a capture interrupt; in a service subprogram of the capture interrupt, the time stamp of each rising edge and falling edge is recorded, and the high level duration and low level duration in a single pulse period are calculated accordingly; according to the high level duration and the low level duration, the actual duty cycle of the current pulse period is calculated, the actual duty cycle is compared with a preset nominal duty cycle tolerance range, and a duty cycle verification result is generated.

A system and methods for processing chord-based input sequences and managing context-aware command execution. A server receives and processes input from at least one client device. An input capture module receives keypress events from a human input device and filters input signals. A chord recognition module analyzes whether a keypress sequence constitutes a recognized chording pattern based on predefined rules, including modifier-based chording, simultaneous non-modifier keypresses, release-based execution, and time-based chording. A sheet management module assigns a command sheet based on the active application or computing context. A sheet stack manager prioritizes command sheets, with the highest-priority sheet determining execution when multiple layers are active. A command execution module processes system or application commands based on the recognized chording pattern. A storage module maintains user-defined chording configurations, sheet mappings, and adaptive learning data to optimize future command execution.

The present application relates to a kind of electric energy meter RS-485 communication baud rate self-adapting method and electric energy meter, method includes S1, based on input capture channel, the current timing level waveform diagram corresponding to the current data frame of bus transmission is obtained, the current timing level waveform diagram includes the multiple start symbol data bits corresponding to the start symbol of current data frame;S2, based on current timing level waveform diagram, current baud rate is obtained by calculation;S3, based on current baud rate, current timing level waveform graph is carried out soft decoding to obtain current soft decoding result;S4, if current soft decoding result is correct, current baud rate is determined as communication baud rate and executes step S5, otherwise returns to execute step S1 to obtain the timing level waveform diagram corresponding to the next data frame of bus transmission;S5, with the communication baud rate of determination carries out the transceiver of subsequent bus data.The present application can realize the fast self-adapting of arbitrary baud rate, and anti-interference ability is strong, data reception is complete.

The invention relates to the field of power monitoring, and discloses a multi-protocol compatible power monitoring terminal adaptive access system, which comprises a physical perception adaptation module connected to a communication interface pin; the protocol analysis core module is connected with the physical perception adaptation module and used for receiving byte stream data from the physical perception adaptation module and executing state transition matching in the heterogeneous protocol finite-state machine; the protocol analysis core module comprises a dynamic framing control unit and a baud rate inversion correction unit; and the service standardization module is connected with the protocol analysis core module. A primary estimation baud rate is obtained by using an input capture technology through a physical perception adaptation module, and a baud rate inversion correction unit is combined to reversely calculate a correction baud rate based on an error code position and a phase error accumulation model, so that an effect of establishing stable connection under an unknown communication rate and a non-standard clock frequency is achieved.

Systems and methods for betting on a live sporting event are disclosed. At least one input capture device and at least one user device are in network communication with a server platform. The at least one input capture device collects and transmits live raw data relating to the live sporting event. The server platform receives and aggregates the live raw data relating to the live sporting event from the at least one input capture device. The server platform accesses personal and / or emotional factors for each player in the live sporting event. The at least one user device places at least one bet on at least one aspect of the live sporting event to the server platform via an interactive graphic user interface (GUI) at least based on the live raw data. The server platform determines at least one betting outcome relating to the live sporting event.

The invention relates to the technical field of behavior data credibility evaluation, in particular to a behavior data credibility evaluation system based on time sequence row feature fusion, which is characterized in that an input capture unit captures year and month sub-node input time sequence data of starting and ending time of a project filled by a user in real time; the interrupt monitoring unit detects a system pop-up window and a user active pause as external interrupt, and records an interrupt duration and a continuous filling starting point, and the feature fusion unit performs dynamic time sequence window segmentation and cross-modal alignment; a time sequence behavior feature vector containing a year priority mark, a month lagging time consumption ratio, a cross-year modification time consumption effect difference value and a continued time consumption deviation rate is generated, a credibility evaluation unit judges a behavior mode by means of a four-dimensional decision matrix, a bidirectional threshold comparison and scoring algorithm is detected through a logic fault, a filling behavior authenticity probability value is output, and the filling behavior authenticity probability value is calculated. And the output feedback unit feeds back the probability value to the evaluation system according to sectional risk mapping, so that risk domain differentiation warning is realized, and the credibility evaluation precision is improved.

The invention discloses a full-speed-domain adaptive speed estimation method and system for a sweeper structure, and the method comprises the steps: calculating a pulse variable quantity based on an accumulated count value of an encoder in each control period, carrying out the accumulation of a time reference when the pulse variable quantity is detected to be zero, and carrying out the calculation of the time reference when the pulse variable quantity is detected to be not zero. Calculating a first speed estimation value based on the accumulated time reference and the pulse variation; meanwhile, a second speed estimation value is calculated based on the pulse variation in the fixed control period. And determining fusion weights corresponding to the two speed estimated values according to the current running state of the vehicle, performing weighted fusion on the fusion weights, and outputting the current running speed of the vehicle. Through the above mode, continuous and stable speed estimation of the unmanned sanitation vehicle in a full speed range from a low speed to a high speed is realized without an additional timer or input of capture hardware resources, the sudden change of the speed is effectively avoided, and the control stability and the operation reliability of the whole vehicle are improved.

A system and methods for processing chord-based input sequences and managing context-aware command execution. A server receives and processes input from at least one client device. An input capture module receives keypress events from a human input device and filters input signals. A chord recognition module analyzes whether a keypress sequence constitutes a recognized chording pattern based on predefined rules, including modifier-based chording, simultaneous non-modifier keypresses, release-based execution, and time-based chording. A sheet management module assigns a command sheet based on the active application or computing context. A sheet stack manager prioritizes command sheets, with the highest-priority sheet determining execution when multiple layers are active. A command execution module processes system or application commands based on the recognized chording pattern. A storage module maintains user-defined chording configurations, sheet mappings, and adaptive learning data to optimize future command execution.

This invention belongs to the field of sensors and discloses a hardware-coordinated wake-up signal detection method, apparatus, device, and medium. It is applied to a sensor system including a main control chip and an IO-Link chip. The method includes: associating a DMA channel with capture events of input capture channels; when a capture event occurs, recording the level state of the communication pin of the IO-Link chip controlled by the main control chip through the DMA channel; calculating the pulse width of the signal on the receiving pin of the IO-Link chip and the time difference between the first edge of the wake-up pin and the signal edge on the receiving pin of the IO-Link chip based on the time information recorded by each input capture channel; combining this with the level state of the communication pin of the IO-Link chip controlled by the main control chip to determine whether the first edge of the wake-up pin corresponds to a real wake-up signal; if so, performing a wake-up operation. This improves the accuracy of identifying the real wake-up signal of the IO-Link chip.

Hardware-implemented data processing system for adaptive classroom participation, including: a processor; a storage device that stores executable instructions for processing participation data; an input capture module that is set up to receive user interaction data; a surprise excursion module executed by the processor to generate metadata on experience-based events; a subject-specific lecturer presentation module executed by the processor; a cross-disciplinary lecturer presentation module executed by the processor; a data processing unit designed to normalize input data; an analytics unit set up to classify participation metrics; and an output interface designed to display participation results in real time.

The application discloses an EtherCAT slave station servo synchronization device and method, electronic equipment and a storage medium, and relates to the technical field of servo system control. First, a synchronization signal is generated by an ESC chip at a first period, and then a main control chip captures the synchronization signal and performs a servo synchronization operation. The main control chip further comprises a capture timer and a PWM timer. The capture timer captures the synchronization signal at a second period and records a count value as a capture value. The main control chip adjusts the second period of the capture timer according to the capture value to obtain a second updated period, so that the capture timer and the synchronization signal are synchronized. Then, the second updated period is used to adjust a third period of the PWM timer to obtain a third updated period. The PWM timer is reset according to the third updated period to realize synchronization with the capture timer and the synchronization signal. Thus, the application realizes synchronization only by using a timer peripheral with an input capture function, without using an external interrupt, thereby saving resources and achieving good synchronization effect.

The invention discloses a coal mine underground RS485 two-parameter self-adaptive method, which comprises the following steps of: S1, multiplexing a serial port receiving pin of a single chip microcomputer into a timer input capture mode, and capturing original pulse width data of an RS485 bus; s2, processing low-level pulse width data in the original pulse width data through an improved multi-stage peak detection algorithm, and calculating to obtain the narrowest pulse width; s3, calculating the Baud rate according to the narrowest pulse width, and verifying the effectiveness of the Baud rate; s4, converting the original pulse width data into a digital sequence, and locking a correct check mode based on check bit identification of the digital sequence; and S5, performing data validity verification on the application layer, if the verification is passed, ending the two-parameter self-adaption, and if the verification is not passed, returning to the step S1. According to the coal mine underground RS485 two-parameter self-adaption method, two-parameter self-adaption matching is carried out from the Baud rate and the verification mode of the equipment, and the method has the advantages of being high in matching speed, high in precision, high in interference resistance, good in adaptability and high in practicability.

The present disclosure provides a fluorescence intensity signal acquisition method, a fluorescence temperature measuring instrument and a storage medium; wherein the method triggers ADC conversion and input capture with excitation signal jump as a unified time reference, and automatically transfers the conversion results to the memory by the direct memory access controller when the data is ready each time, which can not only ensure that the sampling window is strictly aligned with the fluorescence decay period, but also release the CPU, the sampling accuracy is no longer limited by the response delay of the CPU, and the silent acquisition of the fluorescence intensity signal can be realized without the participation of the CPU.

Robot system (100, 800) comprising the following: a robot (110, 810) that includes a movable arm configuration (MAC, MAC') the movable arm configuration (MAC, MAC') includes an end tool assembly configuration (ETMC, ETMC') located near a remote end (DE2, DE5) of the movable arm configuration (MAC, MAC'), and wherein the robot (110, 810) is configured to move the movable arm configuration (MAC, MAC') to move at least one section of an end tool (ETL) mounted on the end tool assembly configuration (ETMC, ETMC') along at least two dimensions in an end tool working volume (ETWV, ETWV'); and a motion control system (140, 840) configured to control an end tool position (ETP, ETP') with an accuracy level defined as robot accuracy, based at least partially on sensing and controlling the position of the movable arm configuration (MAC, MAC') using at least one position sensor (SEN1-SEN2, SEN1'-SEN5') incorporated in the robot (110, 810); and wherein the robot system (100, 800) further includes a determination system for additional measurement position coordinates (150, 850) which comprises the following a first image acquisition configuration (160, 860-1) comprising a first camera (CAM1, CAM1'), wherein the first image acquisition configuration (160, 860-1) has an optical axis (OA1, OA1'); an XY scale (170, 870) comprising a nominally planar substrate (SUB) and several corresponding mapping features (IIF, AIF) distributed on the substrate (SUB), wherein the corresponding mapping features (IIF, AIF) are located at corresponding known XY scale coordinates on the XY scale (170, 870); an image trigger section (181, 881) configured to input at least one input signal belonging to the end tool position (ETP, ETP') and to determine the time of a first image acquisition trigger signal based on the at least one input signal and to output the first image acquisition trigger signal to the first image acquisition configuration (160, 860-1), wherein the first image acquisition configuration (160, 860-1) is configured to capture a digital image of the XY scale (170, 870) at an image acquisition time in response to receiving the first image acquisition trigger signal, and a metrology position coordinate processing section (190, 890) configured to input the captured image and to identify at least one corresponding mapping feature (IIF, AIF) of the XY scale (170, 870) contained in the captured image and the associated corresponding known XY scale coordinate location, and wherein the determination system for additional measurement position coordinates (150, 850) with a movable from the XY scale (170, 870) or the first image acquisition configuration (160, 860-1) coupled to the movable arm configuration (MAC, MAC') and the other configured to be coupled to a stationary element (STE) near the robot (110, 810), wherein the stationary from the XY scale (170, 870) or the first image acquisition configuration (160, 860-1) defines a first reference position (REF1, REF1'); a scale plane is defined such that it nominally coincides with the planar substrate (SUB) of the XY scale (170, 870), and a direction normal to the scale plane is defined as a scale image acquisition axis direction (SIA, SIA'), and the robot system (100, 800) can be operated such that it at least nominally provides an operating configuration of the determination system for additional metrology position coordinates (150, 850), wherein in the operating configuration of the determination system for additional metrology position coordinates (150, 850) at least one of the XY scale (170, 870) and the first image acquisition configuration (160, 860-1) is arranged such that the optical axis (OA1, OA1') of the first image acquisition configuration (160, 860-1) is parallel to the direction of the scale image acquisition axis direction (SIA, SIA') and that the scale plane is located within the focus area of ​​the first image acquisition configuration (160, 860-1) along the scale image acquisition axis direction (SIA, SIA'); The determination system for additional metrology position coordinates (150, 850) is configured such that when the movable arm from the XY scale (170, 870) or the first image acquisition configuration (160, 860-1) and the stationary arm from the XY scale (170, 870) or the first image acquisition configuration (160, 860-1) are arranged in the operating configuration and the movable arm configuration (MAC, MAC') is positioned such that the XY scale (170, 870) is in a field of view (FOV, FOV') of the first image acquisition configuration (160, 860-1), the metrology position coordinate processing section (190, 890) can be operated to determine the metrology position coordinates, which are a relative position between the movable arm from the XY scale (170, 870) or the first image acquisition configuration. (160, 860-1) and the first reference position (REF1, REF1') with an accuracy level that is better than the robot accuracy,based on determining the image position of the identified at least one corresponding imageable feature (IIF, AIF) in the captured image; and , The specified metrology position coordinates specify the end tool position (ETP, ETP') at the image acquisition time with an accuracy level that is better than the robot accuracy, at least for a vector component of the metrology position coordinates that is transverse and / or perpendicular to the scale image acquisition axis direction (SIA, SIA').

The invention discloses a cross-terminal unified operation transmission system and method in a cloud game scene. The system comprises a client and a cloud game server; the client comprises a unified input capture module, an operation abstraction module, a coordinate scaling module and a binary coding module; the cloud game server comprises a binary decoding module, an event state management module, a coordinate restoration module and an event injection module. The method has the advantages that the operation delay is remarkably reduced, the data volume of a single operation message can be reduced by more than 75% by replacing JSON with a customized binary protocol, the network transmission time is shortened, the end-to-end operation delay is remarkably reduced, and the response speed and the hand feeling of the operation are greatly improved. Through operation abstraction and coordinate scaling of the client, the server does not need to perceive which equipment or input mode the front end is, all inputs are normalized, and logic complexity and code coupling degree of the server are greatly reduced.

The utility model discloses a zero -crossing point comparison circuit for frequency measurement relates to frequency measurement technical field, and this circuit includes: for the differential homophase amplification circuit of amplitude amplification processing to the sampling signal after voltage division, for comparing the sampling signal with reference signal after amplitude amplification processing to the comparison circuit of high low level logic signal output based on the comparison result, for the voltage follower circuit of high low level logic signal transmission to the analog -to -digital conversion chip. The zero -crossing point comparison circuit provided by the utility model has completed the most critical analog signal processing and zero -crossing detection work, and the singlechip only needs to configure an external interrupt or input capture channel, records time when detecting the edge jump every time, and the software only needs to calculate the time difference between two zero -crossings in succession and obtains frequency by reciprocal, thereby greatly simplifying the software design.