82 results about "Echo sounding" patented technology

Provided is a sound processing system and a sound processing device, which are capable of detecting attachment/detachment of an earphone microphone without adding a signal wire for detection. The sound processing system includes an earphone microphone and a sound processing device. The earphone microphone includes a speaker and a microphone. The speaker outputs an output sound. The microphone outputs a collected sound signal corresponding to collected sounds, and collects echo sound of the output sound echoed in an external acoustic meatus in a state where the earphone microphone is placed in the external acoustic meatus. The sound processing device includes an attachment determinator, which determines whether or not the earphone microphone is placed in the external acoustic meatus based on a variation of the collected sound signal.

The present invention discloses a shallow river water depth surveying and mapping system and method based on unmanned aerial vehicle multi-view shooting. The method comprises step S1: determining a surveying time, a surveying area and surveying precision; S2: setting ground control points GCPs in the surveying area, and using a positioning instrument to perform positioning on the control points; S3: planning a flight line of an unmanned aerial vehicle, and performing aerial shooting according to the pre-determined air line; and S4: using unmanned aerial vehicle image analysis software to process an image of the multi-view shooting in step S3, surveying an orthoimage and a digital surface elevation model of the area, and applying an optical model water depth inverse program to perform refraction correction and to perform inversion to obtain a water depth value of a shallow river. Compared with conventional GPS measurement, total station measurement and echo sounding, the method is time-saving, labor-saving and cost-saving, causes no damage to a water body and a river bed, and has relative high execution efficiency; and water depth surveying and mapping is extended from point measurement to face measurement, a relatively high spatial resolution is provided, and water depth measurement precision and a spatial resolution are also improved.

The present invention achieves the wideband operation of a bolted Langevin-type echo sounder transducer by enabling low frequency operation with securing a sound pressure level above a certain level without changing the external dimensions of the echo sounder transducer. This is an echo sounder transducer includes a Langevin-type vibrator having a front mass and a rear mass, and a cylindrical active vibrator which is sandwiched between the front mass and rear mass, a bend vibrator constituted of a diaphragm arranged in an acoustic radiation surface section of the front mass of the Langevin-type vibrator, and a disc type active vibrator fixed to the diaphragm. This has such structure that a slit, communicating from an outer peripheral side face toward an axial center, is provided on the circumference in the side of the lower portion of the front mass of the Langevin-type vibrator toward the rear mass.

The invention discloses an underwater river landform measurement device and a measurement method for large rivers. The device comprises a control base station and an exploitation ship, wherein a radarcollision-avoiding sonar is arranged in the front of the exploitation ship; a combined sonar, a communication antenna, a GPS (Global Positioning System) antenna and a sailing system are arranged on the exploitation ship; the combined sonar comprises a lateral scanning sonar and a multi-beam echo sounder; by using the combined sonar on the exploitation ship, landform information of the bottom of ariver is measured, obstacle information on a sailing line is acquired by using the radar collision-avoiding sonar, communication with the control bases station is realized through the communication antenna, real-time position signals are acquired through the GPS antenna, and the sailing speed and the sailing direction of the exploitation ship are controlled by the control station through the sailing system. The device is based on a multi-beam echo sounding technique, is applicable to river bottom landforms, is capable of exploring obstacles in a forwarding direction of the exploitation ship through the foresight collision-avoiding sonar in the front of the exploitation ship, ensuring the sailing security of the exploitation ship and greatly alleviating working intensity, and is high in measurement efficiency.

The invention relates to a method for correcting sound velocity of edge beam water depth data based on vertical beam water depth, and a multi-beam echo sounder system (Multi-beam Echo Sounder System, namely MBES) beam refraction correction technology method. Aiming at the actual situation that the edge beam water depth data of the current multi-beam survey system has large errors and a large number of edge beam data are deleted during data processing, the present invention proposes: perform initial processing on the original data of the multi-beam survey, take the vertical beam water depth data as a benchmark, and compare the same From the water depth data measured by the edge beams at the position, the beam travel time corresponding to each beam water depth data, the initial beam launch angle and the attitude data at this time are extracted, an equivalent sound velocity profile is inverted, and the sound ray tracking is performed on the edge beams, and the solution is calculated More accurate bathymetry and position data.

The invention discloses a seafloor shallow stratum sound energy attenuation model building and two important sound energy attenuation feature parameter extraction method. The method mainly comprises the following steps: (1) according to a sonar equation, the sound energy level of reflected waves from the seafloor received by a receiving transducer is calculated; (2) starting from the seafloor, the echo sound energy level of each layers of seafloor shallow stratum sediments is calculated sequentially; (3) according to a surveying adjustment theory, the mathematical model for the whole sound energy propagation process of the shallow stratum is deduced; and (4) according to a slow change rule of sediment types of the shallow stratum in a transverse small range and further according to a least square rule, the back scattering difference and the attenuation compensation residual of neighboring traces on the same stratum are approximately equal. The attenuation rule of sound waves in the seafloor shallow stratum sediments is disclosed, two important acoustic parameters capable of reflecting physical features of the sediments are deduced, important acoustic feature parameters can be provided for classification of shallow stratumsediment types, and the sediment classification precision is better improved.

The invention discloses a real-time dynamic focusing wave beam forming method and system. The method specifically comprises the following steps: echo sound signals are pre-processed by an analog front end and are processed by an analog-to-digital converter so as to be converted into digital signals; the digital signals are subjected to orthogonal transformation, and the plural form Vm of echo signals is obtained; according to a preset angle theta k, a sampling point number n and an array element number m formed by wave beams, calculating a phase shift parameter tau mk of a current array element in real time according to a dynamic focusing wave beam forming method; Vm rotates by the corresponding phase shift parameter tau mk, V'm is obtained, and each channel result is accumulated so as to obtain a real-time dynamic focusing wave beam forming result V(theta k) in a theta k direction; according to an equiangular or equidistance mode, presetting a wave beam angle theta k, repeating the above steps, and completing real-time dynamic focusing wave beam formation. According to the real-time dynamic focusing wave beam forming method and system, the dynamic focusing wave beam formation precision is not lost, the quick calculation capability is achieved, the structure is simple, the method and the system are easy to achieve, and a near field efficiency problem can be greatly solved; and the real-time dynamic focusing wave beam forming method and system can be widely applied to the multiple-wave-beam depth-sounding sonar shallow water depth-sounding field.

An echo chamber including a high-strength, structurally rigid receptacle and a weight bearing grate through which the water from an artificial outdoor waterfall may pass, which grate can support considerable weight loads exerted by materials such as rocks, stones, and the like. The receptacle functions as a substitute for a flexible artificial waterfall water sump liner and receives recirculating water of an artificial waterfall. When constructing a disappearing artificial waterfall using a chamber constructed according to the present invention, rocks or other material are placed on the chamber's grate. As water cascades through the material on the grate and falls into the chamber, an echo sound is generated. Differing configurations of the stones on the grate and changes in water level in the receptacle produce echoes of different pitch and intensity.

A transducer identification system provides transducer characteristic information to an echosounder. The echosounder, in turn, utilizes the transducer characteristic information to alter its functionality or parameters to optimize its performance. The transducer characteristic information can be any combination of a) the resonant frequencies of the transducer; b) the impedances of the transducer at the transducer's resonant frequencies; c) the transducer's power rating; d) the date of manufacture of the transducer; e) the peak transmitting voltage response of the transducer; f) the receiving voltage response of the transducer; g) the figure of merit of the transducer; h) the model number of the transducer; i) the serial number of the transducer; j) the transducer's aging coefficient; k) information regarding the configuration of the transducer, such as the housing style, arrangement of piezoelectric elements, and type of acoustic window; l) the beam width of the transducer; m) configuration and calibration information regarding an included temperature sensor; and n) configuration and calibration information regarding an included speed sensor.

In order to acquire echo sound information about a long-distance target, an active sonar comprises a fan beam transmitter, a fan beam receiver, a propagation path calculator, a path time calculator, and a horizontal distance calculator. The active sonar transmits a plurality of transmitted fan beams horizontally wide and vertically narrow, and the elevation angles of them are mutually deferent, and receives received fan beams vertically wide and horizontally narrow. The propagation path calculator calculates a propagation path of each of the transmitted fan beams based on the profile of medium and the elevation angle of the transmission. The path time calculator calculates a path time which is the time period from the transmission to the reception. The horizontal distance calculator calculates a horizontal distance from the active sonar to a generation source point of each echo sounds based on the propagation path and the path time.

The invention relates to an echo sounder. The echo sounder comprises an upper computer, a sounder main board, a power distribution module, a displayer and a transducer. The upper computer is connected with the sounder main board, the power distribution module and the displayer, the power distribution module is connected with the sounder main board and the displayer, the transducer is connected with the sounder main board, and the sounder main board comprises an MCU, an emitting driver, an emitting power amplifier, a boosting unit, an impedance matching unit and a receiving power amplifier. The receiving power amplifier comprises a prime amplifier, a gain control amplifier, a band-pass filter, a post amplifier and an envelope detector. By means of the echo sounder of the structure, an echo sounder circuit is simplified, miniaturization of the structure of the sounder is achieved, the weight of the sounder is reduced, and the sounder is accordingly portable, convenient to fix and wide in application range.

A method, system, and apparatus are provided for focused ultrasonic acoustic imaging of objects within a body of water. A plurality of echo soundings are collected, the soundings produced by an ultrasonic transmitter and detected by an ultrasonic receiver. Spatial location information of the transmitter and receiver is collected and associated with each collected echo sounding. A focused signal spatial location is selected. One or more of the collected echo soundings are selected. An echo signal from each selected echo sounding is selected. The echo signal selection is determined by a calculation of which echo signal from the selected echo sounding corresponds to a focused signal occurring at the selected focused signal spatial location. The calculation is based on the selected focused signal spatial location and on the collected spatial information associated with the selected echo sounding. The selected echo signals are combined, whereby a focused echo signal is formed. The focused echo signals are graphed based on their respective selected focused signal spatial locations, whereby a focused image is produced.

The embodiment of the invention discloses a pressure sensor equipped inverted echo sounder comprising a hollow glass floating ball and a protection shell arranged outside the glass floating ball. The glass floating ball has two hemispherical balls; a support plate is installed in the glass floating ball; and a circuit board and batteries of a pressure sensor equipped inverted echo sounder are fixed by the support plate. A pressure sensor hole is formed in a lower hemispherical ball case of the glass floating ball and thus an external connector of the pressure sensor is arranged by a watertight port; and a pressure sensor is arranged in the glass floating ball. Besides, a vacuumizing hole is formed in a case of the glass floating ball and is used for realizing vacuumizing processing inside the glass floating ball. The material employed by the glass floating ball has the higher corrosion-resistant property than that of the metal material and the high-strength protection shell is also used for protection, so that usage security of the pressure sensor equipped inverted echo sounder for long time can be improved. Moreover, the glass floating ball is processed by vacuumizing and thus the great floating force can be provided, so that great convenience can be provided for underwater work.

The invention discloses a rapid dynamic focusing method for a shallow-water multi-beam echo sounder. The method comprises the steps that underwater acoustic transducer array elements collect echo sound signals of the multi-beam echo sounder, and the sound signals are converted into electric signals and then processed to obtain digital signals; the digital signals are converted to obtain the plural form V<m> of the echo sound signals; a preset angle theta <k> is selected, and a phase shift parameter tau<mki> of the ith array element is rapidly figured out according to the sampling point number N and the array element number m; the plural form of the phase shift parameters of the array elements and the plural form V<m> of the echo sound signals are correspondingly multiply-accumulated according to the channel number and the sampling point number, and a single-beam dynamic focusing result is obtained; whether a preset angle which is not selected exists or not is judged, if yes, the third step and the fourth step are executed again, and if not, all single-beam dynamic focusing results are output. The rapid dynamic focusing method has the rapid calculating ability with no reduction of the precision of dynamic focusing carried out during multi-beam sounding, and is high in precision, simple in structure and easy to implement.