175 results about "Acoustic testing" patented technology

A system for self-testing an acoustic monitor includes a memory that stores a reference acoustic power of a reference acoustic signal; a digital signal processor (DSP) that computes a real-time acoustic power spectrum of background noise in a frequency range of about 20 Hz to about 80 kHz; a microphone including analog signal conditioning circuitry that receives an acoustic test signal at a test frequency and sound pressure level (SPL), the SPL including an attenuation level; and a processor that compares a measured acoustic power at the test frequency with a calculated acoustic power of the acoustic test signal, the calculated acoustic power including the reference acoustic power and the attenuation level; where the acoustic monitor includes the DSP in signal communication with the microphone.

The invention provides a testing device and an audio automatic testing system and method for a mobile terminal. The testing device includes a soundproof box used for providing a testing environment for the mobile terminal; an acoustic simulating device used for simulating the auditory senses of the human ears and a phonation effect of a human mouth; and a testing clamp used for fixing the mobile terminal and the acoustic simulating device. The acoustic simulating device is fixed on the testing clamp. The testing clamp is fixed in the soundproof box. Through adoption of the testing device, and the audio acoustic testing system and the method for the mobile terminal, a rapid quantizing test can be performed on the mobile terminal efficiently and human factors can be eliminated so that test accuracy is improved and manpower cost is reduced.

The invention pertains to sonar receive arrays. More particularly, the invention pertains to a process for calibrating the amplitude, position and phase angle of an array of underwater receive hydrophones with respect to one another. The process requires projecting an acoustic test signal at a known frequency from a towed underwater acoustic projector toward an array of towed, underwater, interconnected, receive hydrophones; detecting and determining the response of the receive hydrophones to said test signal by signal processing means; and calibrating at least one parameter for the operation of the receive hydrophones resulting from the response. Calibrated parameters include the amplitude, position and phase angle of the receive hydrophones relative to one another.

A direct field acoustic testing system includes at least one control microphone, a controller operatively coupled to the control microphone such that the controller receives at least one input signal from the control microphone, and at least four acoustic transducers operatively coupled to the controller such that each transducer is separately controllable by the controller such that a separate output signal is received by each transducer from the controller. A setup is applied to each of the acoustical transducers. The acoustic output of each of the acoustical transducers is monitored using the at least one control microphone. The output signal of each control microphone with respect to each acoustical transducer is compared to a reference spectrum to create a matrix of error functions, and a corrected drive signal computed for each acoustical transducer is applied to the respective acoustical transducer.

The invention provides a system and a method for testing the single noise quality in a multi-source noise environment, and relates to the field of acoustic measurement and sound quality analysis. An apparatus comprises a computer with a built-in signal processing module, a result output display module and a control module, an analog/digital conversion plate, a gain amplifier and a double-microphone array. The method includes: firstly, arranging the double-microphone array according to the position and the direction of a noise source; acquiring signals, calculating the sound intensity, and performing noise separation; and calculating the loudness and sharpness according to the sound intensity, and performing sound quality evaluation. According to the method, sound quality parameters are employed to evaluate the acoustic characteristics of a specific component in the mixed noise, the method is in accordance with the ear acoustic characteristic, the test is more targeted, and the noises can be more effectively controlled. According to the system, the realization is easy, the operation is convenient, the test precision is high, the blanks in the fields of acoustic tests and sound quality analysis are filled in, and the system can be widely applied to noise control engineering in multiple fields such as automobiles, spaceflight, and household electrical appliances etc.

The invention discloses a construction method for wholly removing a drilling pile head, which belongs to building construction methods and comprises the following steps: 1) sheathing and fixing sleeves on the upper end of a main steel bar of an exposed bearing platform of a rebar cage and the upper end of an acoustic testing pipe; 2) placing a rebar cage sheathed with a sleeve in a pile hole and pouring concrete so as to form a pile foundation; 3) excavating a bearing platform pit when the pile foundation reaches to certain strength; 4) drilling on a position about 10cm above top elevation of a preset pile top in the radial direction along the pile foundation diameter after a foundation pit is excavated; 5) inserting a separating wedge into each drilling hole, hitting the wedges with external force till that the pile head and a pile body are completely separated; and 6) lifting away the pile head from the pile body by a lifting device. The construction method for wholly removing the drilling pile head has a wide application range, materials are easily accessible, and the method is simple and convenient in construction and operation, fast in construction speed, reliable in construction quality, and economical and reasonable. The construction method can well remove the pile head, reduce labor intensity, reduce dust and noise to the greatest extent, and also protect environment and meet green construction requirements.

The invention discloses a mobile telephone and a correction method of an internal electroacoustic component of the mobile telephone. The mobile telephone comprises a native machine, a handfree earphone and a detection module. The correction method comprises the following steps that: the detection module turns on a voice frequency generator of the mobile telephone to generate a first voice frequency electric signal; the first voice frequency electric signal is converted into a first acoustical signal for displaying through an electrical-acoustical conversion component; the electrical-acoustical conversion component is placed near an acoustical-electrical conversion component, wherein the acoustical-electrical conversion component receives the first acoustical signal which is converted into a second voice frequency electric signal to be transmitted back to the detection module; and the detection module compares the difference of the first and second voice frequency electric signals, and judges whether the parameters of the internal electroacoustic component are within a preset range or not according to the comparison result, if so, 'normal' is displayed, if not, 'abnormal' is displayed, and the parameters of the internal electroacoustic component are adjusted. According to the invention, the internal electroacoustic component of the mobile telephone can be corrected at different sites to ensure stable sounding volume just by providing the portable standard handfree earphone without extra acoustic testing instrument.

The invention discloses a complicated stable sound field sound pressure testing device relating to an acoustic testing device. The testing device comprises a driving mechanism I used for driving the whole device to move, an acoustic probe array elevating and rotating driving mechanism II, an acoustic probe array telescopic driving mechanism III, an acoustic probe array IV, an acoustic probe array testing channel correcting driving mechanism V, a sound source reference position measuring column VI, and a point sound source standard sound wave generator VII. The complicated stable sound field sound pressure testing device is advantageous in that the testing device is small and light; the installation and the debugging of the testing device are relatively simple; during the measurement, the labor force and the material force can be greatly reduced, and the labor intensity can be reduced, and in addition, the precision of the measurement data can be increased, and at the same time, the testing device is especially suitable for the on-site operation of the large-scale complicated stable sound field.

A device and method for improving the performance of an electro-acoustic transducer. An acoustic test signal is generated through the electro-acoustic transducer. The acoustic test signal is measured at multiple points on an ambient surface around the electro-acoustic transducer to create measured acoustic data. Based on the measured acoustic data, an acoustic power frequency response of the electro-acoustic transducer is calculated. A correction impulse response for the electro-acoustic transducer is determined based on the acoustic power frequency response. A correction filter applies the correction impulse response to a sound signal input to generate a sound signal output for playback through the electro-acoustic transducer.

The invention relates to a method for sound source localization based on horizontal audiometry. The method comprises the following steps: (1) in a standard sound-insulating dark room, eight loudspeakers are distributed uniformly in a circle with a 50 cm radius, a test subject is the centre of the circle and at the same height as the circle, and the included angle of two adjacent loudspeakers is kept at 45 degrees; (2) eyes of the subject are covered with a black fabric; (3) one of the eight loudspeakers is randomly allowed to make a sound for 40 microseconds with a time interval of 5 seconds, totally 100 times in one test cycle; and (4) the total error is calculated, which is the sum of absolute values of difference between actual position and estimated position of the sound source in the total 100 tests, and the test accuracy rate is calculated, which is the percentage of times when the subject accurately judges the sound source position. The method is simple and feasible, and has high test accuracy and complete functions.

A direct field acoustic testing system includes at least one control microphone, a controller operatively coupled to the control microphone such that the controller receives at least one input signal from the control microphone, and at least four acoustic transducer groups operatively coupled to the controller such that each transducer is separately controllable by the controller such that a separate output signal is received by each transducer from the controller. A setup signal is applied to each of the acoustical transducers. The acoustic output of each of the acoustical transducers is monitored using the at least one control microphone. Assumptions regarding the relationship between the acoustic fields measured by the control microphones are made to enable the controller to reduce the number of calculations needed to compute error functions and corrected drive signals to be applied to the acoustic transducer groups.

System and method for tracking of a head comprising generating and radiating at least one acoustical test signal; receiving the radiated acoustical test signal(s) at two locations at the head under investigation and generating electrical measurement signals therefrom; and evaluating the two measurement signals for determining the position and/or angle of rotation φ from the measurement signals; the evaluation step comprises a cross power spectrum operation of the test signal(s) and the signals from the receivers in the frequency domain.

The invention discloses a vocal cavity testing system, method and device and a readable storage medium, and relates to the technical field of acoustic testing. According to the specific implementationscheme, the method comprises the steps of: obtaining a test instruction; sending an audio excitation signal to the loudspeaker according to the test instruction, and receiving an audio response signal sent by the loudspeaker and collected by the audio collection device; analyzing the audio response signal to generate a control signal; and sending the control signal to the driving equipment, so that the driving equipment changes the volume of the volume-variable rear vocal cavity according to the control signal. According to the embodiment of the invention, the technical problems of time and labor waste and low efficiency in the rear vocal cavity design process are solved, the design efficiency is improved, and the design period is shortened.

The invention discloses an automatic acoustic testing device applied to a notebook computer, for the automatic acoustic testing device, an automatic acoustic testing component in a box body of a soundproof box comprises a testing fixed installation rack, the testing fixed installation rack comprises a fixed installation rack base plate, a fixed installation rack top plate and a fixed installationrack column, and a loudspeaker installation rack on an upper surface of the fixed installation rack base plate is provided with a loudspeaker for test; an upper end side of the fixed installation racktop plate is provided with a computer transfer movable plate driven by a computer transfer driving mechanism, and a computer locating placement plate is installed on the upper surface of the computertransfer movable plate by screws; an upper end side of the fixed installation rack top plate is provided with a microphone component, the microphone component comprises a microphone movable installation rack, a microphone transfer driving mechanism, a microphone support frame, a microphone for test and a computer hold-down mechanism; and a movable hole plugger driven by a hole plugging driving component is arranged between the computer transfer movable plate and the loudspeaker for test. By the design above, the automatic acoustic testing device applied to the notebook computer has the advantages of novel structure design, high automation degree and high working efficiency.

The invention discloses a movable type intelligent noise continuous acquisition system for a transformer substation. The system comprises an acoustic measurement module, a video monitoring module, a measurement control module and a measurement data analysis module; the acoustic measurement module is used for acquiring noise time domain data through an acoustic testing device; the video monitoringmodule is used for recording corresponding noise equipment in real time during noise signal measurement through a video monitoring device; the measurement control module is used for controlling a mobile robot to walk according to routes and time so as to complete the continuous noise measurement of the transformer substation, wherein the routes and time are set according to the distribution conditions of the equipment of the transformer substation; the measurement data analysis module is used for extracting characteristic quantities corresponding to various kinds of information of the equipment in the transformer substation from the acoustic data of all measuring points and corresponding videos, generating a test data report and a noise sound source intensity display image according to thecharacteristic quantities, and drawing a transformer substation sound field distribution cloud diagram. With the movable type intelligent noise continuous acquisition system for the transformer substation of the invention adopted, the automation and intelligentization of noise monitoring are achieved; problems such as the finite point measurement of the transformer substation and inaccurate noisetransmission path judgment can be solved; and the problem that measurement time is limited by weather and operation conditions can be also solved.

An acoustic testing apparatus for testing a laminate material comprising at least one layer of a first material having a first velocity for a first vibration mode and at least one layer, adjacent to said first layer, of a second material having a velocity for a second vibration mode, approximately equal to said first velocity, said acoustic testing apparatus comprising: a first transducer for projecting an acoustic test signal onto a first layer of said at least one layer of a first material disposed in a testing zone, wherein a second transducer for receiving said test signal from said testing zone, and in that said first transducer is adapted to project said test signal at an angle so as to generate in said first layer vibrations of at least said first vibration mode, wherein said vibrations of said first vibration mode are incident on an interface with said layer of said second material under an incidence angle so as to produce in said second layer vibrations of at least said second vibration mode, so that refraction of said test signal at said interface is suppressed.

The invention belongs to the technical field of sediment acoustics and particularly relates to a high-pressure triaxial acoustic testing system. According to the high-pressure triaxial acoustic testing system, a pressure chamber is a vertical cabin, and the upper end and the lower end of the cabin are provided with an upper end cover and a lower end cover respectively; the upper end cover is provided with a spoke type pressure transmitter and an exhaust hole; the lower end cover is provided with a water filling/draining hole, a confining pressure loading hole, a counter pressure loading hole,a hole pressure detecting hole and a watertight cable connecting hole; the lower end cover is connected with a confining pressure loading system, a counter pressure loading system and an axial loadingcylinder, wherein the axial loading cylinder is connected with an axial pressure loading system; a sample testing unit is arranged inside the cabin. The high-pressure triaxial acoustic testing systemcan achieve sound velocity and attenuation measurement of bottom sediment samples under pressure combined environments different in confining pressure, axial pressure and counter pressure and environments of consolidated undrained test, consolidated drained test and unconsolidated undrained test, and meanwhile, can achieve synchronous measurement of pore water pressure, and axial deformation andsize deformation of the bottom sediment samples under different pressure environment conditions.