40 results about "Acoustic camera" patented technology

An acoustic camera comprises a first sound pick-up device, a second sound pick-up device, and a switch. The switch is respectively connected to the first sound pick-up device and the second pick-up device and used to select the first sound pick-up device or the second sound pick-up device to reconstruct the sound field of the sound source of a detected object. The first sound pick-up device has a first microphone array, and the first microphone array is a near-field uniform microphone array. The second sound pick-up device has a second microphone array, and the second microphone array is a far-field non-uniform microphone array.

An acoustic camera for using a MEMS microphone array comprises: an acoustic sensor apparatus (30) comprising a print circuit board (20) on which the plural of MEMS microphone (10) are mounted, to send signals for the detected sound to a data collection unit (40); a data collection unit (40) connected to the acoustic sensor apparatus (30), which samples analog signals related to sound transmitted from the acoustic sensor apparatus (30) to transform into digital signals and transmit them to the central processing unit (40); a central processing unit (50) connected to the data collection unit (40), which calculates noise level based on digital signals related to sound transmitted from the data collection unit (40); and a display unit (60) which is connected to the central processing unit (50), which displays in color the noise level calculated at the central processing unit.

The present invention discloses an acoustic camera which comprises an array of arranged microphones. The microphone arrangement can be organized in planar or non-planar form. The device can be handheld, and it comprises a touch screen for interacting with the user. The acoustic camera measures acoustic signal inten-sities in the pointed direction and simultaneously takes an optical image of the measured area, and shows the acoustic signal strengths with the taken image on the screen. The device analyzes the acoustic signals and makes a classification for the sound based on the analysis. If necessary, an alarm is given by the acoustic camera. Besides the handheld manual use, the device can be fixed on a immobile structure or fixed to a movable or rotatable device or a vehicle, such as to a drone.

The invention discloses a fault detection method for a phased array three-dimensional acoustic camera sonar system. The method includes a step 1 of main chip electrifying start state detection; a step 2 of system data link transmission state detection; a step 3 of front-end large-scale signal conditioning circuit and A / D collection circuit state detection; a step 4 of state detection of a wave beam forming algorithm module of a complex high-speed digital system. According to the invention, BIT design requirements are taken as the rule, faults of the three-dimensional acoustic camera sonar system are positioned automatically and accurately, the detection coverage rate is high, the fault positioning period is short and the equipment testability is improved substantially.

The invention discloses a diagnosis and improvement method for low-frequency abnormal sound of an air conditioning compressor under an idling working condition of a blade electric vehicle. The diagnosis and improvement method mainly comprises the following steps that abnormal sound sources are analyzed, and through simulating calculation and spectral analysis, a sound source part is determined preliminarily; then a final sound source part is determined by adopting an acoustic camera imaging technology; then sound source noise analysis is performed, specifically, noise time domain and frequencydomain analysis, sound filter analysis and sound quality analysis are involved; a rotor shaft vibration frequency response test is performed on air conditioning compressors of the blade electric vehicle and a competitive vehicle model, and a structure which generates the noise of the blade electric vehicle is determined; then, a rotor shaft starting control strategy of the air conditioning compressor of the blade electric vehicle is adjusted, and rotor shaft positioning starting is changed to rotor shaft non-positioning starting; and finally, improvement is performed in two aspects of the structure design and the manufacturing machining technology of the air conditioning compressor of the blade electric vehicle. According to the diagnosis and improvement method, the abnormal noise of theair conditioning compressor can be effectively detected and lowered.

It is provided a system for localizing a sound source and a method therefor. The system includes a movable unit, being adapted for free movement and being integrated with a microphone; a motion tracking unit; and a processing unit, being adapted for receiving microphone signal and motion tracking unit signal and obtaining information on a direction from which sound from the sound source arrives using the microphone signal and motion tracking unit signal obtained during movement of the movable unit. By having the system and the method therefor, it is helpful for solving at least one of the technical problems: the complexity and a large volume of an acoustic camera for localization of a sound source; the restriction of the movement of the microphone in a sound source localization system.

The invention relates to a high precision acoustic sensing device using a microphone array. A plurality of MEMS microphones (10) are arranged in a printed circuit board (20). The invention also relates to an acoustic camera using the microphone array, comprising an acoustic sensing device (30) arranged on the printed circuit board (20) by the plurality of microphones (10); a data collection part (40) for sampling analog signals related with the acoustic sound from the acoustic sensing device (30) and converting the analog signals into digital signals and sending out the digital signals to a central processor (50); the central processor (50) for calculating noise levels respectively related with each microphone (10); a display part (60) for displaying the noise levels respectively related with each microphone (10) and calculated by the central processor (50) in different colors. The high precision acoustic sensing device and the acoustic camera using the microphone array can be used for electronic equipment produced by the existing microphones, such as mobile phones.

The invention provides an acoustic field reconstruction plane confirming method in an acoustic camera system, belonging to the noise analysis and control technical field. First of all, sign points are pasted on the moving object to be tested; the synchronous images in two cameras in the system go through sign point identification through a template matching method, and the identified result is matched to find the corresponding image-point pairs; the matched image-point pairs are space-oriented through a binocular stereo vision method to obtain the coordinates of the sign points corresponding to the selected coordinate system; then a spatial plane of the sign points is calculated, and the plane serves as the reconstruction plane of the acoustic field. The method provides acoustic field reconstruction plane parameters for the acoustic camera system, and establishes the basis for the integration of the acoustic field images and the video images.

A multi-channel ultrasonic acoustic camera for mechanical state monitoring includes an ultrasonic wave sensing board formed by arranging a plurality of MEMS ultrasonic wave sensors sensing ultrasonic waves with a waveband of 20 to 1000 KHz produced from mechanical emission; an ultrasonic wave collecting part connected with the ultrasonic sensing board and converting the ultrasonic waves received by the MEMS ultrasonic wave sensors to digital signals and sending the digital signals to a central processing part; a camera lens shooting images in the facing direction of the ultrasonic wave sensing board; an image processing part converting signals of images shot by utilizing the camera lens to electric signals and sending the signals to the central processing part; the central processing part performing analysis and treatment on the ultrasonic signals received through the ultrasonic wave collecting part and the image signals received through the image processing part; and a display part enabling an ultrasonic wave sound field obtained through calculation of the central processing part to be synchronized with images and to be displayed.

The invention relates to a noise source visualized data accumulation display method,comprising a step S10 of providing a sound and video signal collecting means 100; an initial signal collecting step S20; an initial analyzing step S30; an initial developing step S40; an accumulating signal collecting step S50; an accumulating signal analyzing step S60; and an accumulating displaying step S70, wherein in the display unit 50, the accumulated sound data are displayed on an image in which the initial sound data and the image data are superimposed on each other.

The invention discloses an intermittently-operable intelligence bird dispeller for high-voltage towers, which comprises a bird dispeller body, a solar panel to power the bird dispeller, a radar detector, a microprocessing component to control the bird dispeller to hibernate or not, a subsonic generator, an LED strobe light, an acoustic camera, a pneumatic bird-dispelling rod, an intelligent acoustic camera, and a fastening mechanism for connecting the bird dispeller to a high-voltage tower. The radar detector is an RCWL-0516 radar detector; the microprocessing component to control the bird dispeller to hibernate or not is compose of a 37G13-50001 AMP type relay and a SPCE061A single-chip microcomputer; the subsonic generator is an IC 555-P type subsonic generator having a frequency of 10 Hz; the LED strobe light is a high-frequency red-blue strobe light; the acoustic camera is of F1-B type, can rotate by 360 degrees and can connect to a cellphone APP for control. The intermittently-operable intelligence bird dispeller for high-voltage towers is effective in preventing a nest from being built on a tower.

The invention relates to the technical field of sound source positioning, in particular to a sound source positioning method adopting a fisheye lens, and equipment for the method. According to the method, by combining with the fisheye lens, a sound source is positioned through an incident straight line or an incident angle of a sound wave. The advantages of the sound source positioning method adopting the fisheye lens, and the equipment for the method include but not limited to the advantages that in general, the specific coordinates of the sound source are calculated without a formula by angle positioning instead of position positioning through the characteristics of the fisheye lens, so that an acoustic camera can realize wide-range and large-angle sound source positioning; and the number of microphones can be reduced through an algorithm, so that the acoustic camera is miniaturized, the cost can be greatly reduced, and the popularity of the acoustic camera is greatly improved.

The invention discloses a broadband DOA estimation method based on time-varying mixed signal blind separation. The method comprises the following steps: acquiring multi-sound-source reverberation dataof an acoustic camera system; forming a deep blind beam forming algorithm through a GPR-UKF-NMFD blind separation algorithm, a variational Bayesian blind separation algorithm, a time-varying online blind separation algorithm, a GCC-PHAT algorithm and an MVDR beam forming algorithm; performing time-varying blind source separation, reverberation removal and DOA estimation on multi-sound-source reverberation data through a depth blind beam forming algorithm. Based on the GPR-UKF-NMFD blind separation method, the variational Bayesian blind separation method, the time-varying online blind separation method, the DOA estimation method of GCC-PHAT and the MVDR beam forming method, the invention provides the depth blind beam forming algorithm of an acoustic camera system suitable for DOA estimation of multiple sound sources, and the algorithm is transplanted into the acoustic camera system. Time-varying blind separation, positioning and de-reverberation of multiple actually-measured sound sources are realized through a semi-physical simulation experiment.

The invention relates to a novel multiple spectra acoustic camera and an identification method. The novel multiple spectra acoustic camera is used for ultrasonically imaging and identifying human body or object under a complex environment so as to identify the human body and object information. The novel multiple spectra acoustic camera comprises a hardware component and an image processing component; the hardware component comprises a fixing plate and an ultrasonic generator array and a receiver array which are arranged on the fixing plate; the ultrasonic generator array and the receiver array are simultaneously connected with a collecting processing circuit; the image processing component comprises an emitting / collecting processing module and an imaging and identifying processing module. The invention has the following advantages: 1) the novel multiple spectra acoustic camera can be used for detecting under a bad optical environment, such as night, has wider practicability and can work under a complex working condition; 2) the state information of human body and object can be acquired in real time through imaging and identification according to the invention and the worker can conveniently observe and treat; 3) due to the special nature that the ultrasonic wave is different from the optics, a human body image formed by an ultrasonic camera contains no excessive privacy information and has higher confidentiality.

The invention relates to a detection system for detecting non-conventional targets of automotive chassis. The detection system comprises a positioning subsystem, an acoustic camera subsystem, a hyperspectral subsystem and a data processing subsystem, wherein the positioning subsystem is used for positioning detection positions by utilizing a fused laser technology, and acquiring and recording thedetection positions and detection paths by utilizing an ultra-wideband technology and a carrier-free communication technology; the acoustic camera subsystem is used for acquiring sound signals sent byabnormal sounds of non-conventional targets of automotive chassis, and carrying out sound source positioning on the sound signals to obtain sound intensity of the abnormal sounds of the non-conventional targets of the automotive chassis and then generate sound images; the hyperspectral subsystem is used for acquiring hyperspectral image information of external features at automotive chassis areasthrough hyperspectral sensors carried on different space platforms so as to generate hyperspectral images; and the data processing subsystem is used for carrying out image registration by adoption ofa grey information method or a transformation domain method or a feature method, synthesizing the sound images with the hyperspectral images to generate images of the non-conventional targets of theautomotive chassis, so as to realize detection for the non-conventional targets of the automotive chassis.

The invention relates to a vehicle chassis noise problem source positioning system and positioning method. The method is characterized in that the relative movement of a chassis sound pickup row formed by more than two chassis sound pickups arranged side by side in the width direction of a vehicle body relative to a vehicle chassis directly above in the vehicle length direction is acquired to detect sound intensity of each part of the vehicle chassis, and the noise problem source location of the vehicle chassis is determined by a data processor based on the value picked up by the chassis soundpickup row and vehicle length and width values inputted previously. The method is advantaged in that sound intensity distribution of the vehicle chassis can be detected through the chassis sound pickup row formed by more than two chassis sound pickups arranged side by side in the width direction of the vehicle body in cooperation with the data processor, the noise problem source location of the vehicle chassis is determined in combination with the vehicle length and width values inputted previously into the data processor, an acoustics camera in the prior art is replaced, not only the structure is simple, but also cost is quite low, and practicality is strong.

The invention discloses an acoustic sensor array control circuit for an acoustic camera. The acoustic sensor array control circuit comprises an acoustic sensor array, a digital acoustic signal processing module and a main control unit. The main control unit comprises a crystal oscillator, a bit clock phase-locked loop, a byte phase-locked loop, a bit clock allocation unit, a byte clock allocationunit and converters. The acoustic sensor array is provided with 8 branches, and each branch is uniformly provided with 8 acoustic sensor units. The 8 acoustic sensor units comprise 4 main channel sensors and 4 accessory channel sensors. The beneficial effects are that the plurality of acoustic sensor units arranged on the acoustic sensor array comprise the main channel sensors and the corresponding accessory channel sensors; and the same main control unit sends a clock source signal, and the signal is distributed to the sensor units of the array through a distributor, so that clock signals from the same clock source are transmitted to the acoustic sensors, and clock signal synchronization of the acoustic sensor units is guaranteed.

The invention provides an acoustic camera positioning error correction method based on a point sound source. The method sequentially comprises the following steps that the point sound source is fixedto the diagonal position of a full anechoic chamber; equipment to be calibrated is placed in the same diagonal line of the point sound source position; a point sound source and an annular lamp are switched on; the equipment identifies the position of the annular lamp through a video image and determines the position of the point sound source in the picture; the position of the electric point soundsource in the acoustic image is identified through a microphone array; fusion parameters of the acoustic image point sound source position and the video picture point sound source position are calculated by an algorithm; the deflection equipment enables the point sound source to fall on the other position of the picture; the steps are repeated to test the position of the point sound source for multiple times; after calibration of a certain frequency point is completed, the point sound source is switched to other frequency points for calibration; and the steps are repeated to complete a complete calibration process. According to the method, the positioning error of the acoustic camera can be corrected, and the acoustic image can accurately coincide with the video image.

The invention relates to the technical field of robots and especially relates to a belt conveyor post robot. The robot comprises a robot shell, a remote control terminal, a double-vision high-definition camera, an acoustic camera, a multi-parameter gas sensor and a control circuit, wherein the center of the bottom of the robot shell is sunken to form a mounting part, a first mounting position is further arranged at the bottom of the robot shell, and the double-vision high-definition camera is arranged on the mounting part and used for collecting visual images and thermal imaging data in real time; the acoustic camera is arranged on the first mounting position and is used for accurately positioning a sound source; and the multi-parameter gas sensor is arranged on the first mounting positionand is used for acquiring various gas data in real time. Working efficiency can be improved, labor cost is reduced, and the probability of work errors is reduced.

The invention discloses a random distribution microphone array. The random distribution microphone array comprises an array frame, an array fixing support, an acoustic camera and three-dimensional sound intensity probe supports. Microphone measuring points are optimized by means of mixed Gaussian distribution so that the array can be used for not only medium-low-frequency medium-far-distance near-field acoustic holographic positioning but also a medium-high-frequency medium-far-distance beam forming positioning technology. At the same time, three-dimensional sound intensity probes can also beinstalled on the array frame for performing three-dimensional sound intensity measurement. Compared with a conventional single-form array frame structure, a random distribution microphone array framedevice has the advantages of having more functions and a wider application range.

The invention provides a single-sensor acoustic camera based on a space folding acoustic metamaterial. The camera comprises one or more acoustic channel modules and an acoustic sensor; acoustic channels with space folding structures are formed in the acoustic channel modules, one end of each acoustic channel is an acoustic input end, and the other end of each acoustic channel is an acoustic outputend; different acoustic channel modules are adjacently placed, and the acoustic output ends face the same position; the acoustic sensor is arranged on the position where the acoustic output ends face; a sound wave enters the acoustic channels from the acoustic input ends of the acoustic channel modules, and the incident sound wave is subjected to directional modulation, then output by the acoustic output ends and acquired by the acoustic sensor. The camera only contains one acoustic sensor, a model can be manufactured through 3D printing, and the camera has the advantages of wide frequency bandwidth, high precision, small size, low cost and the like.

The invention provides a variable matrix sound positioning system and a positioning method. The variable matrix sound positioning system comprises a plurality of sound sensors, a data processing device and a plurality of data transmission lines with equal lengths, wherein the plurality of sound sensors are used for constructing a three-dimensional coordinate system and picking up sound data; the data processing device is used for constructing the three-dimensional coordinate system based on the positions of the plurality of sensors, marking the position of each sensor in the three-dimensionalcoordinate system, receiving the sound data picked up by the sound sensors, calculating the distance between a sound source and each sound sensor, and calculating the position of the sound source in the three-dimensional coordinate system based on the position data of each sensor; and each data transmission line is connected between each sound sensor and the data processing device. Compared with some acoustic cameras or stethoscopes, the positioning system provided by the invention can arrange a detection matrix according to the will of a user or a use site, is not limited by the application environment, and can meet the positioning of abnormal sound sources in a chassis and a cabin of a vehicle in the running process.

In one embodiment, a field-deployable acoustic camera system is provided for measuring a two-dimensional velocity field in a large scale flow in a turbid environment. The system includes an acoustic camera and a concentrator lens. The concentrator lens operates to reduce a spreading angle of the acoustic camera. The system is configured to apply planar cross-correlation velocimetry to collected images of native micro-bubble and / or suspended particle motion collected in turbid environments such as lake circulation, riverine, estuarine, and coastal flows, as well as turbid flows that occur near dredging operations.

An acoustic camera includes an acoustic transmitter disposed at one longitudinal end of a housing. The transmitter has a convex radiating surface. A diameter of the transmitter is about four times a wavelength of acoustic energy emitted by the transmitter. A plurality of acoustic receivers is disposed at spaced locations in a pattern extending laterally from the housing. A signal processor is in signal communication with the acoustic receivers. The signal processor is configured to cause the acoustic receivers to be sensitive along steered beams. The signal processor is configured to cause an end of the steered beams to move through a selected pattern within a beam width of the acoustic energy emitted by the acoustic transmitter. The signal processor is configured to operate a visual display device to generate a visual representation corresponding to acoustic energy detected by the acoustic receivers. A visual display device is in signal communication with the signal processor.