87 results about "Acoustic frequency" patented technology

The invention relates to the technical field of oil-water detection equipment, and discloses an oil-water detector and method based on a liquid mass resonance measurement principle. The oil-water detector based on the liquid mass resonance measurement principle comprises a parameter sensing unit which is used for contacting an oil-water mixed medium in a pipeline and comprises a current carrying body with a measurement cavity, a measurement probe arranged in the measurement cavity and a resonance body arranged in the measurement probe; and the data processing unit is in signal connection with the parameter sensing unit and comprises a signal transmitting module which is used for transmitting an audio frequency sweep frequency signal to the resonant body to excite liquid column resonance and transmitting electromagnetic short waves with a preset frequency to an oil-water mixed medium at the same time. According to the invention, direct measurement of the density and the dielectric constant is fused, the phase state is identified by using an intelligent algorithm, and the model is switched, so that the problem of failure of a single principle technology in a specific phase state is solved, and high-precision measurement in a water-in-oil state or an oil-in-water state in a full range from pure water to pure oil is realized.

A method for detecting interference between a transducer of acoustic signals and a sensor having a mechanical resonance frequency with a frequency band that includes transmitting an acoustic signal within a known range of frequencies, in a sequence during a predetermined time window, monitoring the output signal from the sensor within said time window, comparing the transmitted signal with the sensor output signal and detecting deviations in the sensor output signal corresponding to frequencies in the acoustic signal, and determining the acoustic frequencies interfering with the sensor signal. A system for detecting interference including a transducer, configured to emit a sequence of acoustic signals, and a sensor configured to produce an output signal, an analysis unit adapted to monitor said output signal with the acoustic signal.

The invention provides an acoustic modal test method and device, electronic equipment and a storage medium, and the method comprises the steps: controlling at least one sound source device to output a preset audio signal at the same time; acquiring response signals detected by the plurality of sensors; the plurality of sensors are used for respectively executing sound detection at a plurality of detection positions in a compartment area; establishing a geometric model based on the audio signal, the detection position and a response signal detected by the sensor; and analyzing the geometric model to obtain an acoustic modal test result. According to the embodiment of the invention, the acoustic modal test result measured by the method is beneficial to improving the riding experience of passengers.

The invention provides a special gas box for a multifunctional audio-frequency environment-friendly drilling machine, which comprises a gas outlet end assembly and a gas inlet end assembly, the gas outlet end assembly comprises a gas outlet end mandrel and a gas outlet end mandrel jacket, the gas outlet end mandrel is provided with a through upper central gas passage, and the gas outlet end mandrel jacket is provided with a gas outlet communicated with the upper central gas passage; the air inlet end assembly comprises an air inlet end mandrel and an air inlet end mandrel outer sleeve, a double-wall inner pipe is arranged in the center of the air inlet end mandrel, and the double-wall inner pipe is provided with a lower center air channel and an annular air channel. The air inlet end mandrel outer sleeve is provided with an air inlet communicated with the annular air channel. The top of the air inlet end mandrel is connected with the bottom of the air outlet end mandrel; the air outlet end mandrel outer sleeve and the air inlet end mandrel outer sleeve are connected through a connecting piece. After the air box is installed on the multifunctional audio frequency environment-friendly drilling machine, the reverse circulation down-the-hole hammer can be used on the multifunctional audio frequency environment-friendly drilling machine.

In order to adapt the frequency response of headphones, various filters are used, including shelving or frequency-shelving filters. However, these are usually implemented electronically. In the case of wired headphones without their own voltage supply, however, no electronic signal processing is possible. In order to realise an acoustic shelving filter, an acoustic damping element (DD) having a flat, acoustically effective damping material, which has a defined specific acoustic resistance, is placed in front of the radiating surface of the sound transducer at a small distance (d) in relation to the diameter of the acoustic damping element. It thus forms a flat air gap (AG), which is open at the edge, with respect to the radiating surface of the transducer. Acoustic properties of the shelving filter can be controlled by the size and material of the damping element (DD) and its distance from the sound panel (SW) or from the transducer (W).

There is disclosed a thermoacoustic system. The system comprises a thermocouple junction and an electronic signal generator for generating an acoustic frequency driving signal across the junction, which causes the system to generate an acoustic wave via the Peltier effect.

The invention relates to an ear sound production instrument, a detection method, a medium and computer equipment, and the instrument comprises an ear canal detection probe which is suitable for being inserted into an ear canal of a tested object and forms sealing fit with the wall of the ear canal, and the ear canal detection probe comprises an acoustic output unit which transmits an audio signal to the ear canal, the acoustic input unit is used for receiving a reflected wave of the audio signal in an ear canal; the sound insulation cover is arranged outside the auditory meatus detection probe in a sleeving mode and covers the auditory meatus detection probe and an auditory meatus opening so as to weaken noise and improve the signal-to-noise ratio of reflected waves, otoacoustic emission detection can be carried out without depending on a special sound insulation room environment, and the accuracy and clinical applicability of a detection result are guaranteed.

A sound reproduction apparatus comprising a plurality of spaced-apart sound sources, and the sound sources providing multiple arrays comprising a first array arranged to emit at least a first acoustic frequency range and a second array arranged to emit at least a second acoustic frequency range; and wherein the first array is arranged to emit a sound frequency range which is higher than the frequency range emitted by the second array, and further wherein a lateral extent of the first array is less than a lateral extent of the second array, and yet further wherein the lateral extent of each of the multiple arrays decreases as the frequency band output by an array increases.

The invention discloses a piano tuning auxiliary positioning system, belongs to the technical field of musical instrument tuning, and aims to solve the problem of positioning deviation caused by neglecting string tension dynamic evolution and environmental disturbance in the prior art. The system comprises a tuning peg state sensing module, a string tension evolution monitoring module, a central cooperative controller, a man-machine interaction guide module and an audio feedback verification module. Through fusion of triple information of tuning peg angular displacement, tension steady state discrimination and acoustic frequency feedback, staged accurate guidance and dynamic decision are realized. The system rapidly approaches the target in the coarse tuning stage, premature termination is avoided in the fine tuning stage according to the tension steady state, the tuning accuracy is ensured through audio closed-loop verification, and the tuning precision, efficiency and robustness are remarkably improved.

The invention discloses a two-dimensional acoustic crystal based on a microstructure. A functional material layer of the two-dimensional acoustic crystal comprises square acoustic cells which are periodically arranged in an xy plane according to a square lattice; a scatterer in the acoustic cell has rotational symmetry and is composed of a cross structure and four identical semicircles, the cross structure is composed of two identical rectangular strips in an orthogonal mode, the diameter of the semicircle is collinear with the short edge of the rectangular strip at the tail end where the semicircle is located, and the diameter of the semicircle is larger than the length of the short edge of the rectangular strip. The rotation angle of the scatterer is matched with the geometric parameter of the scatterer, so that the physical energy band structure of the two-dimensional acoustic crystal generates a triple degeneracy point formed by the first three physical energy bands at the M point of the Brillouin region, and further a stable boundary state with global characteristics is realized. Furthermore, an acoustic frequency beam splitter is constructed on the basis of the boundary state, and sound waves of different frequency bands are split to form included angles of 180 degrees and 90 degrees.

This application discloses a method and system for dynamic mapping of partial discharge audio signals based on multimodal intelligent sensing, relating to the field of signal processing. The method includes: acquiring ambient audio signals and partial discharge signals; performing frequency domain conversion on the ambient audio signals to obtain a frequency domain energy distribution; calculating the masking sound pressure level based on the frequency domain energy distribution and constructing a global masking threshold curve; traversing the global masking threshold curve to extract the center frequency of the frequency band, and determining the center frequency of the frequency band with the lowest value as the dynamic carrier frequency; extracting the discharge pulse amplitude and pulse rise time characteristics from the partial discharge signal; mapping the inverse ratio of the pulse rise time characteristics to the modulation frequency, and mapping the direct ratio of the discharge pulse amplitude to the frequency modulation index; generating a synthesized audio stream; and outputting the synthesized audio stream to external headphones. This application can effectively sense and identify the converted partial discharge audio signal in complex noise backgrounds.

There is provided a respiratory support device for providing pressurized air to a subject. The respiratory support device comprises a conduit, an acoustic generator, and an acoustic sensor. The conduit is for conveying an airflow. The conduit has an opening. The acoustic generator is adapted to generate an acoustic signal in the conduit at an acoustic frequency. The acoustic sensor is arranged outside the conduit. The acoustic sensor is adapted to generate a sensor signal representative of the acoustic signal. The respiratory support device comprises a membrane arranged to cover the opening to separate the acoustic sensor and the airflow from each other. The membrane is adapted to resonate at the acoustic frequency.

Mixing a liquid sample and at least one reagent in microchannel of a microfluidic device includes preparing a segment of the liquid sample in contact with the reagent(s) within the microchannel. The liquid segment has a volume of 2 μL or less and defines a proximal gas-liquid interface and a distal liquid-gas interface. The gas of the proximal gas-liquid interface is in gaseous communication with a distal liquid-gas interface of another amount of liquid disposed proximally to the liquid segment within the microchannel of the microfluidic channel. The gas of the distal liquid-gas interface is disposed distally to the liquid segment within the microfluidic channel. With the liquid of the liquid segment in contact with the reagent(s) within the microchannel, the gas of the distal liquid-gas interface and / or the gas of the proximal gas-liquid interface is / are oscillated at an acoustic frequency to induce mixing of the liquid and the reagent(s).

The invention relates to the technical field of ceramic production waste heat utilization, in particular to a kiln waste heat gradient utilization method which comprises the steps that after a ceramic tile enters a cooling zone from a firing zone, the preset cooling duration of a cooling section is determined according to the thickness of the ceramic tile, and after the preset cooling duration is over, hot air is extracted according to the preset heat extraction rate and the preset extraction amount; judging whether the extraction of the waste heat meets a preset standard or not according to the thermal deformation characterization value of the ceramic tile; when the thermal deformation characterization value is larger than or equal to a second preset thermal deformation characterization value, it is judged that extraction of the waste heat does not conform to a preset standard, and an extraction adjustment strategy when extraction of the waste heat does not conform to the preset standard is determined according to the audio frequency energy change rate of the ceramic tile within the preset frequency band; and according to the utilization grade and the processing strategy determined by the hot air utilization evaluation value, gradient utilization is conducted on the extracted hot air. The waste heat recovery efficiency of the kiln is improved.

This invention relates to the field of medical auxiliary diagnostic technology, and discloses an intelligent auxiliary diagnostic system and method for grading the urgency of stroke. The system includes: an acquisition and control module that acquires electrocardiogram (ECG), bilateral photoplethysmography (PPG), and audio signals, and updates the driving current of the bilateral photoelectric acquisition pathways based on the ECG signal; a preprocessing module that divides the physiological perturbation time axis according to the energy distribution of the audio signals, and performs normalization processing on the original photoelectric signals using the driving current; a feature extraction module that calculates the instantaneous gradient sequence of the normalized photoelectric signals and extracts the formant dispersion sequence of the audio signals within the perturbation phase; and an analysis and grading module that calculates the time-domain cross-correlation function of the two sequences to generate a neurovascular decoupling index, and outputs the urgency grading result by combining the transient recovery hysteresis coefficient extracted within the recovery phase. This invention can quantify the temporal decoupling and recovery hysteresis characteristics across neural regulatory pathways, improving the accuracy of stroke grading.

The application relates to the technical field of urban underground pipe network safety monitoring, and discloses a wave corrugation compensator leakage positioning method and system based on an Internet of Things, which is applied to an Internet of Things system comprising a cloud server and a plurality of sensing nodes, and the sensing nodes are installed in the interlayer space of the wave corrugation compensator. The method comprises the following steps: collecting pressure and temperature data of the interlayer space by the nodes at a low frequency, triggering an adjacent node to enter a high-frequency acoustic sampling mode when the pressure change rate is greater than a dynamic threshold value; collecting an acoustic emission signal, filtering mechanical noise through a noise reduction model, and extracting fluid jet noise characteristics; performing cross-correlation analysis on the acoustic signals between the nodes to calculate the actual sound wave conduction distance, and verifying whether real leakage occurs by comparing with a physical topological distance; and finally evaluating the leakage grade according to the steady-state peak value of the pressure data and the acoustic frequency energy data, and outputting device coordinate information. The application has both ultra-low power consumption and strong anti-interference capability, and realizes accurate element-level leakage positioning.

The invention provides an EQ filter parameter optimization method and device, a storage medium and electronic equipment, and is applied to the technical field of audio signal processing. The method comprises the following steps: acquiring original acoustic frequency response data and target acoustic frequency response data corresponding to a hearing scene; according to the hearing scene, target EQ filter configuration is determined from a preset filter configuration strategy, and the target EQ filter configuration comprises a filter type, a filter number and initial filter parameters; based on the initial filter parameters, performing optimization fitting on the original acoustic frequency response data to obtain fitted acoustic frequency response data; constructing a target function based on the difference between the fitting acoustic frequency response data and the target acoustic frequency response data; and the optimization objective function is taken as an objective, and the filter parameter optimization result corresponding to the hearing scene is iteratively determined, so that the efficiency, the accuracy and the intelligent level are improved.

The invention relates to the technical field of vehicles, in particular to a vehicle body abnormal sound test method and device, electronic equipment and a storage medium, and the method comprises the steps: determining a target test parameter based on a current test demand, and testing a to-be-tested vehicle according to the target test parameter, abnormal sound data of the to-be-tested vehicle in the testing process and audio frequency signals collected by a plurality of acoustic cameras are obtained; and generating an acoustic cloud picture according to the audio signal, and obtaining an abnormal sound test result of the vehicle body according to the acoustic cloud picture and the abnormal sound data. Therefore, the problems that a specific implementation method for vehicle vibration collection is lacked, vibration displacement of vehicle-mounted assemblies and parts cannot be collected and processed, a vehicle body abnormal sound source is difficult to visually position, a special monitoring method is not provided for specific assemblies, and related technologies are high in cost, long in consumed time and the like are solved; accurate and efficient monitoring of vehicle vibration and abnormal sound sources is achieved, monitoring cost and time consumption are reduced, and reliable support is provided for optimization of vehicle NVH performance.

The invention provides a DAS water content identification method based on shaft axial acoustic attenuation characteristics. The method comprises the following steps: acquiring DAS acoustic time-domain signals of a plurality of axial positions of a shaft by using a distributed optical fiber; performing preprocessing and frequency domain transformation on the time domain signal to obtain an acoustic frequency spectrum distributed along the axial direction of the shaft; according to the law that the acoustic spectrum amplitude changes along with the position, calculating an acoustic space attenuation feature alpha (f) by adopting least square fitting based on the distance; constructing an attenuation spectrum based on the spatial attenuation characteristics, and extracting attenuation characteristic parameters related to the moisture content from the attenuation spectrum; constructing a training set and establishing a support vector machine (SVM) moisture content identification model based on a radial basis function (RBF); and inputting the actual attenuation characteristic parameters into the trained SVM model to obtain the predicted moisture content. The invention further discloses a water content identification system for executing the method and a storage medium, and the system and the storage medium are suitable for identifying the water content of the oil well shaft fluid.

A method for identifying biological markers using acoustic frequency response is disclosed. The method includes obtaining acoustic information from a received signal from a target location; classifying the acoustic information to provide classified acoustic information based on photoacoustic imaging response using a trained classifier; providing an indication of the classified acoustic information at the target location; and estimating concentration levels from mixtures of photoacoustic-sensitive materials.

The present application relates to the technical field of broken yarn detection, and particularly relates to a ring spinning broken yarn detection method and system based on signal processing. The method comprises the following steps: collecting video data of a ring spinning operation process to obtain ring spinning operation process video data; extracting audio signals from the ring spinning operation process video data and performing parallel baseline drift removal processing to obtain audio signal baseline optimized data; performing ring spinning broken yarn audio signal condition analysis according to the audio signal baseline optimized data to obtain broken yarn audio signal condition data; performing broken yarn factor analysis according to the broken yarn audio signal condition data and performing spinning behavior control optimization to obtain spinning behavior control optimization data; performing control time period intervention on the broken yarn factor data and performing data encoding to obtain signal condition time period intervention encoding data and send the signal condition time period intervention encoding data to a cloud platform to perform ring spinning broken yarn detection. The present application optimizes the broken yarn detection technology to make the detection technology more accurate.

The invention discloses an electric push rod type environment sampling closed pressure maintaining drilling tool and a using method thereof, belongs to the technical field of drilling equipment, and aims to solve the problems that pollution exists in existing deep well environment sampling, and deep liquid and gas components cannot be obtained. When used, the drilling tool is matched with an audio frequency drilling machine, and efficient sampling is achieved through high-frequency vibration; after sampling is completed, the electric push rod is started, the ball valve is driven to rotate through gear and rack transmission, the ball valve is tightly attached to the ball valve sealing piece, the sampling device is closed, and then a mixed sample containing gas, liquid and solid is obtained; meanwhile, the core inner pipe and the ball valve assembly form a closed space, the original pressure of a sample is kept in the drilling tool lifting process, and pollution and component loss are avoided; the drilling tool is reasonable in structure and convenient to operate, can meet the requirements of the fields of geological exploration, oil and gas field development and environment monitoring for deep well high-quality sampling, and has good practicability and application prospects.

The invention discloses a microwave frequency measuring device based on a Fano resonator, and belongs to the field of microwave photon signal detection. Traditional single-time frequency measurement is divided into two stages, the first stage is based on FTTM, interference, beat frequency and filtering processes between a linear frequency modulation laser and optical signals output by a tunable continuous wave laser which modulates signals to be measured are utilized, and time intervals of time domain pulses appearing on an oscilloscope are calculated; and reversely deducing the to-be-measured frequency to realize rough measurement. In the second stage, an ACF is constructed in the resonance bandwidth of the Fano resonator based on FTPM to serve as a frequency measurement reference, a signal to be measured and a specific local oscillation signal are subjected to intermediate frequency conversion and then are sent into the I / Q lithium niobate optical fiber modulator, the Fano resonator and other elements, the voltage ratio output by the oscilloscope at the moment is compared with the ACF, the frequency of the intermediate frequency signal at the moment can be calculated, and the frequency of the Fano resonator is calculated. And the difference value between the intermediate frequency and the local frequency is calculated, so that the optimization of the measurement precision is realized.

The invention relates to the technical field of municipal engineering, and particularly discloses a sewage treatment plant closed biochemical pool sound wave inspection system, which comprises a base station, a guide rail, a sound robot, an access cover plate, an intelligent control platform and a top plate, the top plate is provided with an access hole, the access cover plate covers the access hole, and the access cover plate can be automatically opened and closed; the base station is in wireless communication with the sound robot, and the base station is connected with the intelligent control platform; when the sound robot slides into the biochemical pool, sound wave audio data of the aerator and position data of the sound robot can be collected, the intelligent control platform can judge whether the aerator is abnormal or not according to the sound wave audio data of the aerator, and when the aerator is abnormal, the position data of the sound robot can be acquired. And determining the position data of the aerator according to the position data of the sound robot, and giving an alarm. According to the invention, inspection can be carried out under the top plate of the biochemical pool, and damage of the aerator is intelligently judged by monitoring sound wave and audio frequency abnormity of the aerator of the biochemical pool, so that the labor intensity of inspectors is reduced, and an equipment maintenance basis is provided.

The application discloses a fan blade diagnosis method and system based on voiceprint perception, relates to the technical field of intelligent monitoring of wind power equipment, and comprises the following steps: performing frequency domain compensation processing based on a set of wind flow characteristic parameters, stripping environmental wind noise components, and generating a pure voiceprint signal; identifying a sensitive acoustic frequency band of a fan blade based on the pure voiceprint signal, exciting a sound wave phase coordination effect in the sensitive acoustic frequency band, and generating a strengthened voiceprint signal; quantifying the internal damage depth of the fan blade material according to the strengthened voiceprint signal, and calculating an acoustic energy flow disorder degree index; determining the health state of the fan blade according to the acoustic energy flow disorder degree index through a multi-dimensional acoustic characteristic state space mapping mechanism, and generating a three-dimensional health evaluation report; and through physical-level wind noise stripping technology, generating a transfer function matrix based on vortex interference modeling and sound wave-air flow phase offset correction, realizing frequency energy reweighting decoupling, and accurately stripping environmental wind noise in a strong turbulent flow environment.

This invention belongs to the field of fluid-structure interaction dynamics analysis technology, and specifically discloses a method and system for analyzing the dynamic characteristics of an acoustic-frequency resonant hybrid system. The method includes: introducing an external excitation force vector and a fluid feedback force vector into the dynamic control equations of the acoustic-frequency resonant hybrid system to form coupled dynamic equations; numerically characterizing the fluid feedback force using a multi-harmonic fitting method to obtain a fluid force model; based on the fluid force model, obtaining the dominant frequency component of the fluid force and mapping it equivalently to an additional mass parameter and an equivalent damping parameter; then fitting the optimal functional form of the additional mass parameter and the equivalent damping parameter relative to the excitation acceleration; updating the coupled dynamic equations based on the optimal functional form to achieve dynamic characteristic analysis under different excitation acceleration conditions. This invention can accurately analyze the dynamic characteristics of an acoustic-frequency resonant hybrid system under high-acceleration vibration environments to address nonlinear dynamic problems induced by fluid-structure interaction.

The application discloses a resonant cavity-based optical beat method light speed measuring device and measuring method, and belongs to the light speed measuring field. The measuring device comprises a laser emitter. One side of the laser emitter comprises, in sequence along the light path direction, an acousto-optic device, two plane mirrors, a half-transmitting and half-reflecting mirror and an illuminance detector. The laser emitter generates monochromatic light. The monochromatic light enters the acousto-optic device to obtain two light waves with a frequency difference, and coupling is performed to obtain one beat wave. The beat wave changes direction after passing through the two plane mirrors and enters the half-transmitting and half-reflecting mirror. The half-transmitting and half-reflecting mirror transmits the beat wave, and at the same time, reflects a part of the beat wave reflected by the illuminance detector, so that the beat wave is reflected back and forth between the half-transmitting and half-reflecting mirror and the illuminance detector. The illuminance detector receives the beat wave on a light-sensitive surface thereof while reflecting a part of the beat wave, so as to measure the illuminance value of the beat wave. The measuring device further comprises a frequency meter, and the frequency meter displays the acoustic frequency of the acousto-optic device. The light speed can be measured by using the measuring device.

The invention discloses a polygonatum kingianum seed seedling raising method, and belongs to the technical field of medicinal plant cultivation. The method comprises the following steps: carrying out micro-electrophysiological signal detection on disinfected polygonatum kingianum seeds, and when the membrane potential is lower than a threshold value, applying quantum electromagnetic induction in a range of 0.1-5THz to realize dormancy awakening; a water film with a certain thickness is formed above the seeds, and sound waves with a specific frequency band are applied, so that the water film generates standing waves and vortexes to improve water absorption and gas exchange; the membrane potential and the change rate are obtained in real time through the micro-electrophysiological signal acquisition array in the whole seedling raising process, electromagnetic and sound wave parameters are dynamically adjusted according to the frequency correction model, and electrophysiology, physical field and environmental data are input into the digital twinborn model; and the electromagnetic frequency, the sound wave frequency and the temperature, humidity and light conditions are subjected to combined self-adaptive regulation and control based on multi-objective optimization. The method can accelerate the germination of the polygonatum kingianum seeds, improve the germination rate and the emergence uniformity and reduce the unit energy consumption, and is suitable for seedling production of polygonatum kingianum and other deep dormancy medicinal plants.

1. The name of the design product: sound card (aio2). 2. The use of the design product: sound card for adjusting sound frequency. 3. The design points of the design product: the combination of shape and pattern. 4. The picture or photo that best shows the design points: perspective view 1.

The utility model relates to the technical field of fishing gears, in particular to a compact type magnetic force synchronous adjusting device which comprises a protective shell. The top end of the interior of the protective shell is rotationally connected with the magnetic force adjusting knob, the right side of the magnetic force adjusting knob is provided with the adjusting gear, and the right side of the adjusting gear is provided with the multiple ticking grooves at equal intervals; a driven gear is arranged at the position, corresponding to the adjusting gear, in the protective shell and meshed with the adjusting gear, a magnetic steel sleeve is arranged at the position, corresponding to the driven gear, of the right side of the protective shell, and a ticking ball is arranged at the position, corresponding to the ticking groove, of the left side of the magnetic steel sleeve. The adjusting gear and the driven gear are driven by the magnetic adjusting knob to be in meshing transmission, the ticking groove periodically presses the ticking ball in the rotating process of the gear, the resistance threshold value is fed back and adjusted in real time through mechanical collision audio signals, and an acoustic prompting mechanism for dynamically sensing the resistance is formed.