32 results about "Infrasound waves" patented technology

The invention relates to the technical field of drainage management, and discloses a drainage pipe network mixed connection and misconnection checking system, method and device, and the system comprises an infrasonic wave fingerprint sounder, an infrasonic wave fingerprint receiver and a data background which are in wireless connection in sequence. The infrasonic wave fingerprint sounder is arranged at a pipe opening of a target drainage pipeline, and the infrasonic wave fingerprint receiver is arranged in a drainage pipeline opening in a target diagnosis area; the infrasonic wave fingerprint generator encodes the infrasonic wave fingerprint to obtain an encoded infrasonic wave signal, and sends the encoded infrasonic wave signal into the target drainage pipeline; the infrasonic wave fingerprint receiver collects infrasonic wave fingerprint signals of the drainage pipeline opening in the target diagnosis area; and the data background performs pipeline communication detection and mixed and wrong connection point judgment based on the coded infrasonic wave signal and the infrasonic wave fingerprint signal to obtain a drainage pipe network mixed and wrong connection troubleshooting result. According to the method, the accuracy of a drainage pipe network mixed connection and misconnection troubleshooting result is ensured, and the troubleshooting efficiency is improved.

The invention discloses a hearth flue gas velocity field measurement method and system based on a multi-layer sonic sensor, and the method comprises the steps: obtaining the sound wave propagation time when a sound wave reaches other sonic sensors after the sound wave is transmitted each time according to the multi-layer sonic sensor; different two-dimensional plane temperature fields are formed based on sound wave propagation time obtained by the same-layer sound wave sensors; according to different two-dimensional plane temperature fields, performing estimation by combining a correlation analysis method and a linear interpolation method to obtain three-dimensional hearth temperature field distribution; constructing a solving equation based on the three-dimensional hearth temperature field distribution, the acoustic wave propagation time and propagation path from the lower acoustic wave sensor to the upper acoustic wave sensor, and a preset flue gas velocity field; and solving the solving equation, outputting unknown parameters in the flue gas velocity field, and reconstructing full-field velocity distribution according to a preset flue gas velocity field formula. According to the method, no hardware cost is increased, the velocity field in the vertical direction of the hearth smoke is accurately measured, and key data support is provided for combustion optimization and intelligent monitoring of a power plant.

Seating including a sound cancellation system is described. An example vehicle bench seat has a first backrest, a first loudspeaker, a second backrest, a second loudspeaker, a center portion, and a seat base. The first loudspeaker is disposed within the first backrest, and the second loudspeaker is disposed within the second backrest. Each of the first loudspeaker and the second loudspeaker emits primary sound waves and secondary sound waves. The secondary sound waves of the first loudspeaker are 180 degrees out of phase with the primary sound waves of the first loudspeaker, and the secondary sound waves of the second loudspeaker are 180 degrees out of phase with the primary sound waves of the second loudspeaker. The center portion includes a channel that directs the secondary sound waves emitted by the first loudspeaker and the second loudspeaker into a vehicle cabin to cancel unwanted primary sound waves.

This invention discloses an infrasound localization method for minor pipeline leaks, comprising: acquiring the original infrasound signal of the pipeline leak; performing variational mode decomposition on the original infrasound signal to obtain IMF components; based on the IMF components, using an improved generalized cross-correlation function to obtain the time difference between the infrasound reflection to the upstream and downstream ends of the pipeline; calculating the wave velocity of the infrasound according to the pipeline characteristics; and determining the location of the pipeline leak point based on the time difference and wave velocity. The improved generalized cross-correlation function method involves: constructing an analytical signal based on the IMF components; using an improved linear adaptive weighted local approximation algorithm to obtain the local optimal solution of the IMF components; and performing inverse attenuation dispersion compensation analysis based on the generalized cross-correlation function to obtain the time difference between the infrasound reflection to the upstream and downstream ends of the pipeline. This invention can accurately locate the pipeline leak point.

This application provides a portable oil and gas well fluid level monitoring system and method, relating to the field of underground wellbore fluid level monitoring technology. The system includes: a virtual instrument platform configured with a LabVIEW-based program for casing pressure signal acquisition and control, a sound-generating device control program, and a sound wave signal acquisition program; a portable acquisition instrument including: a USB data acquisition card, a pressure transmitter, a sound-generating module, and a microphone; the pressure transmitter acquires pressure information at the inlet of a normally closed solenoid valve within the sound-generating module; when the pressure information reaches a preset pressure, a pressure ready signal is generated; when the pressure ready signal is valid, the sound-generating module is controlled to generate infrasound; and the infrasound reflection signal received by the microphone is acquired, processed by a MATLAB-based signal processing program, and displayed in the user interface of the sound wave signal acquisition program. The implementation method provided in this application is beneficial for improving the efficiency and safety of oil well production.

This invention relates to the field of underwater acoustic equipment technology, and discloses an aerodynamic source for underwater infrasound generation. It includes multiple aerodynamic source units, some of which are main aerodynamic sources, and the remainder are auxiliary aerodynamic sources. The number of auxiliary aerodynamic sources is no less than that of the main aerodynamic sources. An array of auxiliary aerodynamic sources corresponding to each main aerodynamic source is distributed around the main aerodynamic source. The emission ports of the multiple aerodynamic source units all face the same direction. Each aerodynamic source unit includes a unidirectionally connected operating chamber and a emission chamber. The air inlet of the operating chamber is connected to an external air source to introduce inert gas into the operating chamber. The emission port is located at the end of the emission chamber furthest from the operating chamber. This invention allows for individual adjustment of the emission time of each emission chamber, broadening the infrasound frequency range and increasing the infrasound intensity, enabling the generation of broadband infrasound signals with an intensity exceeding 200 dB in underwater environments.

The invention discloses an audio playing equipment wearing state detection method and device, and relates to the technical field of communication. The method comprises the steps that when a first condition is met, a first detection audio signal is played in a first time period, and the frequency of the first detection audio signal is within the frequency response range of infrasonic waves; collecting a first feedback audio signal in the first time period; and determining the wearing state of the audio playing equipment according to the similarity of at least one sampling point of the first feedback audio signal and the first detection audio signal in the first time period.

The utility model discloses a boiler flue gas energy-saving heat exchanger ash removal structure which comprises a connecting cylinder installed on the outer wall of a heat exchanger shell, the connecting cylinder is communicated with the heat exchanger shell, a flange on the connecting cylinder is connected with a horn tube, and the large-caliber end of the horn tube penetrates into the heat exchanger shell through the connecting cylinder. The small-caliber end of the horn tube is connected with a sound wave ash remover, the air inlet end of the sound wave ash remover communicates with an air supply pipe through a hose, the outer wall of the heat exchanger shell is connected with a sound insulation cover in a sealed mode, sound absorption cotton is fixedly bonded to the inner wall of the sound insulation cover, and the connecting cylinder, the horn tube and the sound wave ash remover are all located in the sound insulation cover. According to the sound wave dust remover, the sound wave dust remover is arranged, the propagation characteristic of high-power sound waves or infrasonic waves in a space medium can be utilized, accumulated dust in the heat exchanger shell can be effectively removed, the operation efficiency and safety of equipment are improved, the sound wave dust remover, the horn pipe and the connecting cylinder can be shielded through the sound insulation cover and the sound absorption cotton, and the sound wave dust remover is prevented from being damaged. Therefore, noise pollution is reduced.

The application provides a submarine cable routing and fault point positioning method. Sound waves emitted by two sound sources with known coordinates are received by a sound wave receiving device of the submarine cable. After receiving the sound waves twice continuously, the time difference between the two times when the sound wave receiving device receives the sound waves emitted by the two sound sources twice is obtained, the submarine cable routing is positioned, the fault point is pre-positioned by using a distributed optical fiber sound wave sensing technology, the relative position relationship between the two sound sources and the fault point is obtained based on the sound wave receiving device, the smaller the time difference between the times when the sound wave receiving device receives the sound signals emitted by the two sound sources and the fault point is, the closer the distance between the two sound sources and the fault point is, the two sound sources are moved along the submarine cable routing direction to the fault point until the time difference is smaller than a given value, and the coordinate of the submarine cable routing at this time is taken as the coordinate of the fault point.

The invention discloses an infrasonic wave monitoring method and device, electronic equipment and a storage medium. The method comprises the following steps: determining first waveform data; the first waveform data is used for describing data acquired in real time and related to a first sound monitoring array; determining configuration parameters based on the first waveform data; the configuration parameters are parameter information used by a preset algorithm associated with the first sound monitoring array; the preset algorithm is configured in the event processing task to process the waveform data; determining an event processing task of the first sound monitoring array based on the configuration parameters; processing second waveform data according to the event processing task of the first sound monitoring array to obtain a detection result; the second waveform data comprises the first waveform data and / or waveform data of the first sound monitoring array except the first waveform data. According to the technical scheme, the problems that the use efficiency of computing resources for infrasonic wave monitoring is low, the compatibility of a PMCC detection algorithm is poor, and the real-time computing efficiency is low are solved.

The invention relates to an integrated composite detector based on infrasound audio vibration. A collection detector integrating three sensors is composed of an infrasound sensor, a vibration sensor, a microphone and a collection control calculation circuit board. A Beidou antenna, a 4G antenna and an LR-WIFI antenna are installed in the detector head, head solar energy serving as an auxiliary power supply is installed on the surface of the head of the detector head, and external solar energy serving as a main power supply is installed outside the detector head. The detector head is installed on the ground nail barrel, the battery pack is installed in the ground nail barrel, and the ground nail head is connected below the ground nail barrel. A vibration sensor is installed in a ground nail head, a sound guide pipe is installed outside a detector head, a microphone is connected with the sound guide pipe, and sound waves enter the microphone from the sound guide pipe. According to the invention, good detection of homologous infrasonic waves, audio sound waves and vibration is realized.

The application relates to the technical field of sewer pipeline detection, and discloses a sewer pipeline structural defect detection system, method, medium and product. The controller actively constructs and generates coded infrasound wave signals, so that the signals have stable frequency and amplitude characteristics. An infrasound sounding module uses the coded infrasound wave signals to emit and process infrasound waves, and makes low-frequency mechanical vibration signals stably propagate along the pipe wall, reduces energy attenuation, and covers long-distance pipe sections that cannot be reached by traditional passive detection. The low-frequency mechanical vibration signals are detected by an infrasound signal receiving module, and analog signals are converted into initial digital signals, so that interference and distortion in the transmission process are reduced. Further, by combining a Fourier transform method and a correlation coefficient analysis method, the problem of high misjudgment rate of a traditional single algorithm is avoided, the accurate identification of pipeline structural defects is ensured, and the accuracy requirement of sewer pipeline structural defect detection under complex working conditions is met.

The present invention relates to a network device security detection method, system, device, and medium, comprising: monitoring the sound waves generated by a number of network devices within a target physical area; upon detecting infrasound waves emitted by any network device, obtaining acoustic wave signature information of the infrasound waves; and determining whether the acoustic wave signature information contains preset target information. If so, marking the network device corresponding to the acoustic wave information as a target device. The present invention can effectively detect whether network devices within the target physical area are using infrasound waves to carry out eavesdropping attacks, helping to more comprehensively defend against network attacks that maliciously steal data and information.

The present application discloses a method and system for monitoring operating equipment based on infrasound. The method comprises: obtaining real-time operating speed information of the operating equipment when it is operating in a pipeline, the operating equipment including a pipe cleaner and an internal detector operating in the pipeline; encoding the operating speed information to obtain a target infrasound frequency; generating infrasound waves based on the target infrasound frequency and transmitting the infrasound waves; receiving infrasound signals propagating along the pipeline wall at a detection point preset on the outer wall of the pipeline; decoding the infrasound signals to obtain decoded speed information; and obtaining the operating status of the operating equipment based on the decoded speed information to reflect the risk of detection operations of the operating equipment. The present application utilizes the characteristics of infrasound waves propagating on steel pipe walls to achieve long-distance communication between the operating equipment in the pipeline and the equipment outside the pipeline, obtain the operating speed of the operating equipment in the pipeline in real time, effectively improve the efficiency of detection within the pipeline, and reduce the risks of pipe cleaning and internal detection operations.

Provided is a dehydrogenation method capable of efficiently reducing hydrogen content in steel for thick or complexly-shaped steel materials and steel products in general. In a dehydrogenation method for a steel material, in a series of steel material production process including: a process of supplying a steel raw material; a process of subjecting the steel raw material to hot working; a process of inspecting a steel material obtained from the steel raw material; and a process of shipping the steel material, at least one of the steel raw material and the steel material at any stage from the supply process to the shipment process is subjected to, at least once, a sound wave irradiation treatment so that a sound pressure level at a surface of the at least one of the steel raw material and the steel material will be 30 dB or more.

The application relates to the technical field of drainage management, and discloses a mixed wrong connection drainage pipe network checking system, method and device.The mixed wrong connection drainage pipe network checking system comprises a infrasound fingerprint sound generator, an infrasound fingerprint receiver and a data background which are sequentially wirelessly connected.The infrasound fingerprint sound generator is arranged at the pipe opening of a target drainage pipe, and the infrasound fingerprint receiver is arranged in the drainage pipe opening in a target diagnosis area.The infrasound fingerprint sound generator encodes infrasound fingerprints to obtain coded infrasound signals, and sends the coded infrasound signals into the target drainage pipe.The infrasound fingerprint receiver collects infrasound fingerprint signals of the drainage pipe opening in the target diagnosis area.The data background carries out pipe connection detection and mixed wrong connection point determination based on the coded infrasound signals and the infrasound fingerprint signals, and obtains a mixed wrong connection drainage pipe network checking result.The application guarantees the accuracy of the mixed wrong connection drainage pipe network checking result, and improves the checking efficiency.

The application discloses a dummy system and method for detecting the injury effect of infrasound waves on human bodies, and relates to the technical field of dummy systems. The dummy system comprises a dummy body and an infrasound wave detection, collection and processing device. The dummy body comprises a head, a neck, a trunk, an artificial heart and an artificial lung. The artificial heart and the artificial lung are arranged in the trunk. The head, the trunk, the artificial heart and the artificial lung are made of acoustic metamaterials. The infrasound wave detection, collection and processing device comprises acceleration sensors and a data acquisition module arranged in the dummy body respectively, infrasound wave frequency test sensors and infrasound wave sound pressure intensity test sensors arranged in the environment where the dummy body is located respectively, and an upper computer. The data acquisition module is electrically connected with the acceleration sensors. The upper computer is electrically connected with the data acquisition module, the infrasound wave frequency test sensors and the infrasound wave sound pressure intensity test sensors respectively. The dummy system can simulate the resonance and damage state of the human body under the influence of infrasound waves.

An audio signal processing method and device, an earphone and a storage medium, the method being applied to the earphone, the method comprising: outputting a test audio signal through a loudspeaker, the test audio signal being obtained by mixing a basic audio signal and an infrasonic wave signal; collecting a receiving audio signal corresponding to the test audio signal through a feedback microphone; a first equalization parameter corresponding to the basic audio signal and a second equalization parameter corresponding to the infrasonic wave signal are determined according to the received audio signal, the first equalization parameter is used for performing ear shape adaptive equalization matched with the ear shape of a user on a to-be-output target audio signal, and the second equalization parameter is used for performing adaptive equalization on the to-be-output target audio signal; the second equalization parameter is used for carrying out wearing leakage adaptive equalization matched with the earphone wearing state on the target audio signal. According to the embodiment of the invention, the earphone can provide personalized ear shape adaptive equalization and wearing leakage adaptive equalization for different users, thereby facilitating the improvement of the effectiveness of the earphone in performing active noise reduction on the audio signal.

The invention relates to the technical field of marine disaster early warning, and discloses a typhoon path inversion method and system based on marine background noise spectrum features, and the method comprises the steps: S1, constructing an LSTM-Attention feature fusion model; s2, noise data and meteorological data of at least three nodes are collected once every five minutes; the noise data comprises 8-20Hz infrasonic wave signals, and the meteorological data comprises air pressure data, wind speed data and temperature data; s3, screening the noise data to obtain an effective infrasonic wave signal; and S4, performing spectrum analysis and feature extraction on the effective infrasonic wave signals to obtain infrasonic wave features and the like. According to the method and system, a physical coupling mechanism of'typhoon infrasonic wave-barometric gradient-sea surface wind field 'is established through coupling modeling of ocean background noise infrasonic wave features (8-20 Hz) and meteorological parameters, and typhoon path deviation is pre-warned 6-12 hours in advance.

The application discloses a kind of mud-rock flow monitoring positioning early warning systems based on infrasound wave, comprising the following steps: step S1: for the mud-rock flow prone area of complex mountainous area in construction period, infrasound sensor array is laid out;Step S2: by real-time acquisition infrasound signal, by 4G or Beidou wireless communication technology data transmission to data processing center;Step S3: the infrasound signal of acquisition is carried out data processing and analysis identification;Step S4: based on comprehensive consideration infrasound signal energy attenuation model and sound reach time difference (TDOA) algorithm, the energy attenuation data of multiple sensors received to infrasound signal and time difference calculate the position of mud-rock flow infrasound wave source;Step S5: system according to monitoring result and set threshold, automatically trigger early warning mechanism, to public warning;Step S6: by visual monitoring platform, real-time display mud-rock flow infrasound signal waveform, mud-rock flow position and early warning state.

The invention discloses an infrasound event positioning method and system, and relates to the field of infrasound monitoring, and the method comprises the steps: carrying out the discretization of a research region, and obtaining grid nodes; reading an infrasonic wave form from a sensor of the station, and preprocessing the infrasonic wave form; back-projecting the preprocessed infrasonic waveform based on the infrasonic velocity and the distance between the grid node and the station; extracting envelope energy based on a back projection infrasonic waveform, stacking extracted infrasonic waveform envelopes, taking a grid node corresponding to a maximum stacking value as a preliminarily positioned infrasonic source position, and taking the position as a center to select a new research area so as to re-determine the infrasonic source position; selecting a new infrasound speed, and obtaining a plurality of new infrasound source positions based on the new infrasound speed; and taking the position with the maximum stacking value in all the positions of the infrasound source as the final position of the infrasound source. According to the method and the device, the accuracy of infrasound event positioning can be ensured under the condition that the station is only arranged for a single sensor.

An audio signal processing method and device, an earphone and a storage medium, the method is applied to the earphone, comprising: outputting a test audio signal through a loudspeaker, the test audio signal is obtained by mixing a basic audio signal and a infrasound signal; collecting a received audio signal corresponding to the test audio signal through a feedback microphone; determining a first equalization parameter corresponding to the basic audio signal and a second equalization parameter corresponding to the infrasound signal according to the received audio signal, wherein the first equalization parameter is used for performing ear shape adaptive equalization matched with the ear shape of the user on a target audio signal to be output, and the second equalization parameter is used for performing wearing leakage adaptive equalization matched with the wearing state of the earphone on the target audio signal. By implementing the embodiments of the present application, the earphone can provide personalized ear shape adaptive equalization and wearing leakage adaptive equalization for different users, thereby helping to improve the effectiveness of the earphone in actively reducing noise on the audio signal.

The invention belongs to the technical field of infrasonic waves, and particularly discloses a plasma acoustic element layer and phased array combined infrasonic wave orienting device which comprises a phased array, a corona discharger and a shell, and the shell is used for fixing the phased array and the corona discharger. According to the device, the acoustic characteristics of an acoustic metasurface film are changed through a piezoelectric transducer in a phase control array, incident infrasonic waves are regulated and controlled, the emitted infrasonic waves have certain directivity, and therefore initial focusing orientation of the infrasonic waves is achieved. After the phase control array emits infrasonic waves with certain directivity, the infrasonic waves are subjected to further refraction regulation and control through the plasma acoustic element layer formed by the corona discharger, so that the infrasonic waves are refocused to the expected direction to improve the orientation effect. By combining the two-layer structure of the phase control array and the corona discharger, accurate orientation of infrasonic waves is achieved, and the technical problems that an existing infrasonic wave orientation device is poor in orientation effect and too large in size are solved.

The utility model discloses a microphone housing and a bottom structure, the microphone housing comprises an upper cover and a lower cover provided with a gap, the lower cover is fixedly installed on the upper cover, the upper cover is provided with an upper cavity, the lower cover is provided with a lower cavity, and when the lower cover is fixedly installed on the upper cover, the upper cavity and the lower cavity form an accommodating cavity. The upper cover is provided with at least one fan-shaped hole, and the upper cover is provided with a light guide hole. The damping silica gel sleeve and the flexible body can absorb and reduce resonance generated by mechanical vibration, noise is reduced from the source, sound waves pass through the fan-shaped holes and the silencing holes in sequence in the transmission process, so that the sound waves rub with media and are treated for multiple times, the amplitude of the sound waves is effectively reduced, the maximum noise reduction effect is achieved, and the noise reduction effect is improved. And the influence caused by noise is greatly reduced, so that a sound absorption and micropore noise reduction system is established, and the sound insulation effect of the microphone is ensured.

The application relates to the technical field of marine disaster early warning, and discloses a typhoon path inversion method and system based on marine background noise spectrum characteristics, which comprises the following steps: S1, constructing an LSTM-Attention feature fusion model; S2, collecting noise data and meteorological data of at least three nodes, once every 5 minutes; the noise data comprises 8-20 Hz infrasound wave signals, and the meteorological data comprises air pressure data, wind speed data and temperature data; S3, performing screening processing on the noise data to obtain effective infrasound wave signals; and S4, performing spectrum analysis and feature extraction on the effective infrasound wave signals to obtain infrasound wave features and the like; the method and system are coupled with meteorological parameters through marine background noise infrasound wave features (8-20 Hz) to model, a physical coupling mechanism of a 'typhoon infrasound wave-air pressure gradient-sea surface wind field' is established, and typhoon path deviation can be early warned for 6-12 hours.

A system is provided for detecting an anomaly in a monitored device having one or more internal components that are mechanically displaced during operation of the monitored device which produces pressure variations internal to the monitored device. For example, a system comprises a passive infrasound sensor mounted to an exterior wall of the monitored device to detect infrasound produced by the pressure variations and a monitoring device comprising a controller. The controller is configured to receive data from the passive infrasound sensor corresponding to the detected infrasound, compare the data received from the passive infrasound sensor to a plurality of infrasound reference signals to determine if the detected infrasound is indicative of an anomaly in at least one of the one or more internal components.

The present invention discloses a refrigeration equipment drain pipe blockage monitoring device and monitoring system, belonging to the field of sound wave detection, including an exciter and an infrasound receiver. The exciter is used to excite the outer wall of the refrigeration equipment drain pipe to generate infrasound waves, and the infrasound receiver is used to receive the infrasound wave signal. The device also includes: a mounting base fixedly connected to a connecting plate at both ends, the connecting plate having a connecting hole and an arc-shaped slide, the arc-shaped slide and the connecting hole being concentrically arranged; the exciter and the infrasound receiver are mounted on the mounting base; a fixed plate fixedly connected to the two ends of the arc-shaped plate, the fixed plate rotatably connected to the connecting hole, the fixed plate having a screw hole, a screw threaded in the screw hole, a fitting fixedly connected to the end of the screw, the fitting being able to press the outer wall of the refrigeration equipment drain pipe; and the screw being located in the arc-shaped slide. This invention has the advantage of being able to measure from multiple angles.

The application discloses a resonant cavity pressure feedback control method for infrasound wave generation and relates to the technical field of industrial control. The resonant cavity pressure feedback control method for infrasound wave generation comprises the following steps: S1, obtaining pre-wave cavity pressure observation data and performing time axis repositioning and period scale unification; S2, calculating a peak value phase difference, and evaluating pre-wave pressure window adaptation; S3, evaluating cavity pressure loss sequence deviation, and performing cavity pressure loss state feature matching; and S4, constructing a control direction matrix, writing a closed-loop control vector into a controller, and generating a lock identification. The application effectively improves the stability of resonant cavity pressure concentration, pressure relief control and frequency lowering in the infrasound wave generation process, and solves the problem that existing infrasound wave generating equipment can only rely on driving frequency or driving power adjustment, and it is difficult to determine whether an effective pressure window is formed in front of a quarter wavelength in the cavity.

This invention relates to the field of sound monitoring technology, specifically to a wildlife sound detection system, method, and device based on voiceprint recognition. The system includes: a multimodal sound acquisition module, a voiceprint feature extraction engine, an acoustic fingerprint database, a species identification decision module, and an ecological behavior analysis unit. The multimodal sound acquisition module integrates an array microphone and an infrasound sensor, supporting full-band environmental acoustic signal acquisition. The voiceprint feature extraction engine uses an adaptive frequency band segmentation algorithm to extract animal voiceprint biometrics. The acoustic fingerprint database stores acoustic feature templates for multiple species and environmental noise samples. The species identification decision module constructs a voiceprint classification model based on a deep residual network. The ecological behavior analysis unit generates wildlife activity pattern reports through a spatiotemporal distribution map of acoustic events. This solves the problems of severe environmental noise interference, low individual feature differentiation, and difficulty in identifying species with small samples in existing technologies.

The present invention discloses a broadband infrasound calibrator with adjustable amplitude, comprising a sound mouth, a sinusoidal small piston, a pressure-regulating large piston, a sinusoidal driver, a pressure-regulating driver, a cam, a small piston connecting rod, a pressure chamber, a controller, and a displacement sensor; the sinusoidal driver is used to drive the cam, which is connected to the sinusoidal small piston via the small piston connecting rod and is used to drive the sinusoidal small piston to vibrate up and down, thereby generating a single-frequency sinusoidal sound wave in the pressure chamber and outputting a pressure sound wave from the sound mouth; the displacement sensor is installed at the bottom of the sinusoidal small piston and is used to monitor the amplitude of the sinusoidal small piston vibration; the pressure-regulating driver is used to drive the pressure-regulating large piston to move up and down, which can change the volume of the pressure chamber, thereby changing the pressure amplitude of the generated sinusoidal sound wave; the controller is connected to the sinusoidal driver and the pressure-regulating driver and is used to control the sinusoidal driver and the pressure-regulating driver. The present invention can generate broadband sinusoidal sound waves with adjustable amplitude.