阅读说明：本技术 体积声源的校准装置 (Calibrating device for volume sound source ) 是由 赵莹 郑浩锐 魏亮 李平 于 2021-06-07 设计创作，主要内容包括：本申请涉及一种体积声源的校准装置。所述装置包括：体积声源,用于产生声波；声波导管,所述声波导管的一端与所述体积声源连接,所述声波导管用于传导声波,所述体积声源的工作频率小于所述声波导管的截止频率；测量分析模块,所述测量分析模块与所述体积声源和所述声波导管连接,所述测量分析模块用于采集所述声波在所述声波导管中传导时的声压和声强以及所述体积声源通过所述声波导管传导声波时内置传感器的输出电压,所述声压、所述声强和所述输出电压联合用于校准所述体积声源的灵敏度与频率响应。采用本装置能够对体积声源进行校准。(The present application relates to a calibration device for a volumetric sound source. The device comprises: a volume sound source for generating sound waves; an acoustic waveguide having one end connected to the bulk acoustic source, the acoustic waveguide being configured to conduct acoustic waves, the bulk acoustic source having an operating frequency less than a cutoff frequency of the acoustic waveguide; the measuring and analyzing module is connected with the volume sound source and the sound wave guide pipe, the measuring and analyzing module is used for collecting sound pressure and sound intensity of the sound wave when the sound wave is conducted in the sound wave guide pipe and output voltage of the built-in sensor when the volume sound source conducts the sound wave through the sound wave guide pipe, and the sound pressure, the sound intensity and the output voltage are jointly used for calibrating the sensitivity and the frequency response of the volume sound source. The device can be used for calibrating the volume sound source.)

1. An apparatus for calibrating a volumetric sound source, the apparatus comprising:

a volume sound source for generating sound waves;

an acoustic waveguide having one end connected to the bulk acoustic source, the acoustic waveguide being configured to conduct acoustic waves, the bulk acoustic source having an operating frequency less than a cutoff frequency of the acoustic waveguide;

the measuring and analyzing module is connected with the volume sound source and the sound wave guide pipe, the measuring and analyzing module is used for collecting sound pressure and sound intensity of the sound wave when the sound wave is conducted in the sound wave guide pipe and output voltage of the built-in sensor when the volume sound source conducts the sound wave through the sound wave guide pipe, and the sound pressure, the sound intensity and the output voltage are jointly used for calibrating the sensitivity and the frequency response of the volume sound source.

2. The apparatus of claim 1, wherein the acoustic waveguide is a rectangular acoustic waveguide or a cylindrical acoustic waveguide.

3. The apparatus of claim 2, wherein a cutoff frequency of the acoustic waveguide is much higher than an upper operating frequency limit of the bulk acoustic source.

4. The apparatus of claim 2, wherein the acoustic waveguide has a cross-sectional area greater than an area of a sound emitting opening of the volumetric sound source, and a length greater than one-half of a wavelength corresponding to a lower operating frequency limit of the volumetric sound source.

5. The apparatus of claim 1, wherein the measurement and analysis module comprises an acoustic intensity meter and a multi-channel acoustic analyzer;

the sound intensity measuring instrument is connected with the other end of the two ends of the sound wave guide pipe;

the first channel of the multi-channel acoustic analyzer is connected with the sound intensity measuring instrument and is used for collecting sound pressure and sound intensity of sound waves generated by the volume sound source when the sound waves are conducted in the sound wave guide pipe through the sound intensity measuring instrument; and a second channel of the multi-channel acoustic analyzer is connected with the volume sound source and is used for collecting the output voltage of the built-in sensor when the volume sound source transmits sound waves through the sound wave guide pipe.

6. The apparatus of claim 5, wherein the measurement function of the first channel of the multi-channel acoustic analyzer is a self-power spectrum function of the sound intensity and a self-power spectrum function of the sound pressure of the sound wave propagating in the sound wave guide, and the measurement function of the second channel of the multi-channel acoustic analyzer is a self-power spectrum function of the voltage of the built-in sensor when the volume sound source transmits the sound wave through the sound wave guide.

7. The apparatus of claim 5, wherein the customized function of the multichannel acoustic analyzer is a particle motion velocity function, and the particle motion velocity function is independent of the sound intensity self-power spectrum function and the sound pressure self-power spectrum function.

8. The apparatus of claim 5, wherein the multichannel acoustic analyzer is further configured to calculate a particle motion velocity magnitude across the acoustic waveguide based on the acoustic pressure and the acoustic intensity; determining the sensitivity of the volume sound source after calibration according to the particle motion velocity amplitude and the output voltage; and determining the frequency response of the volume sound source after calibration according to the sensitivity of the volume sound source after calibration.

9. The apparatus of claim 8, wherein the multichannel acoustic analyzer is further configured to uniformly pick a plurality of measurement points across a cross-section of the acoustic waveguide; taking the ratio of the sound intensity and the sound pressure of each measuring point under the reference frequency as a corresponding particle motion velocity amplitude; and respectively determining the volume velocity sound source sensitivity after the volume sound source is calibrated, the volume acceleration sound source sensitivity after the volume sound source is calibrated and the volume displacement sound source sensitivity after the volume displacement sound source is calibrated under the reference frequency according to the particle motion velocity amplitude on the cross section under the reference frequency.

10. The apparatus of claim 8, wherein the multi-channel acoustic analyzer is further configured to obtain the calibrated sensitivity of the bulk acoustic source at each operating frequency; and obtaining the frequency response of the volume sound source after calibration according to the deviation between the sensitivity of the volume sound source after calibration under each working frequency and the sensitivity of the volume sound source after calibration under the reference frequency.

Technical Field

The present application relates to the field of sound source calibration, and in particular, to a calibration device for a volume sound source.

Background

With the development of science and technology, the volume sound source is widely applied to the process of improving and optimizing the NVH performance of products in the fields of automobiles, ships, airplanes and large-scale machinery. Typically, the calibration of the sound source is performed on the point source hypothesis. However, the assumption of a point source is that the geometric dimensions of the source are much smaller than the wavelength of the sound waves, and the assumption of a point source is not satisfied for some volume sources, especially low frequency volume sources, so that the calibration of these volume sources cannot be performed.

Disclosure of Invention

In view of the above, it is necessary to provide a calibration apparatus for a volume sound source.

An apparatus for calibrating a volumetric sound source, the apparatus comprising:

a volume sound source for generating sound waves;

an acoustic waveguide having one end connected to the bulk acoustic source, the acoustic waveguide being configured to conduct acoustic waves, the bulk acoustic source having an operating frequency less than a cutoff frequency of the acoustic waveguide;

the measuring and analyzing module is connected with the volume sound source and the sound wave guide pipe, the measuring and analyzing module is used for collecting sound pressure and sound intensity of the sound wave when the sound wave is conducted in the sound wave guide pipe and output voltage of the built-in sensor when the volume sound source conducts the sound wave through the sound wave guide pipe, and the sound pressure, the sound intensity and the output voltage are jointly used for calibrating the sensitivity and the frequency response of the volume sound source.

In one embodiment, the acoustic waveguide is a rectangular acoustic waveguide or a cylindrical acoustic waveguide.

In one embodiment, the cutoff frequency of the acoustic waveguide is much higher than the upper operating frequency limit of the bulk acoustic source.

In one embodiment, the cross-sectional area of the acoustic waveguide is greater than the area of the sound outlet of the volume sound source, and the length of the acoustic waveguide is greater than one-half of the wavelength corresponding to the lower limit of the operating frequency of the volume sound source.

In one embodiment, the measurement and analysis module comprises an acoustic intensity meter and a multi-channel acoustic analyzer;

the sound intensity measuring instrument is connected with the other end of the two ends of the sound wave guide pipe;

the first channel of the multi-channel acoustic analyzer is connected with the sound intensity measuring instrument and is used for collecting sound pressure and sound intensity of sound waves generated by the volume sound source when the sound waves are conducted in the sound wave guide pipe through the sound intensity measuring instrument; and a second channel of the multi-channel acoustic analyzer is connected with the volume sound source and is used for collecting the output voltage of the built-in sensor when the volume sound source transmits sound waves through the sound wave guide pipe.

In one embodiment, the measurement function of the first channel of the multi-channel acoustic analyzer is a self-power spectrum function of the sound intensity and a self-power spectrum function of the sound pressure when the sound wave propagates in the sound wave guide, and the measurement function of the second channel of the multi-channel acoustic analyzer is a self-power spectrum function of the voltage of the built-in sensor when the volume sound source transmits the sound wave through the sound wave guide.

In one embodiment, the customized function of the multi-channel acoustic analyzer is a particle motion velocity function, and the particle motion velocity function takes the sound intensity self-power spectrum function and the sound pressure self-power spectrum function as arguments.

In one embodiment, the multi-channel acoustic analyzer is further configured to calculate a particle motion velocity magnitude on the acoustic waveguide cross-section from the acoustic pressure and the acoustic intensity; determining the sensitivity of the volume sound source after calibration according to the particle motion velocity amplitude and the output voltage; and determining the frequency response of the volume sound source after calibration according to the sensitivity of the volume sound source after calibration.

In one embodiment, the multi-channel acoustic analyzer is further configured to uniformly select a plurality of measurement points on a cross-section of the acoustic waveguide; taking the ratio of the sound intensity and the sound pressure of each measuring point under the reference frequency as a corresponding particle motion velocity amplitude; and respectively determining the volume velocity sound source sensitivity after the volume sound source is calibrated, the volume acceleration sound source sensitivity after the volume sound source is calibrated and the volume displacement sound source sensitivity after the volume displacement sound source is calibrated under the reference frequency according to the particle motion velocity amplitude on the cross section under the reference frequency.

In one embodiment, the multichannel acoustic analyzer is further configured to obtain the calibrated sensitivity of the volume acoustic source at each operating frequency; and obtaining the frequency response of the volume sound source after calibration according to the deviation between the sensitivity of the volume sound source after calibration under each working frequency and the sensitivity of the volume sound source after calibration under the reference frequency.

The calibrating device for the volume sound source is based on the characteristic that sound waves are transmitted in the sound wave guide tube, namely, the sound waves are represented by the prior knowledge of one-dimensional plane sound waves when the sound wave frequency is lower than the cut-off frequency of the sound wave guide tube, the sound waves generated by the volume sound source to be calibrated are transmitted in the sound wave guide tube, then the sound pressure, the sound intensity and the output voltage of the built-in sensor are collected, according to the transmission characteristic of the one-dimensional plane sound waves, the sound pressure of the calibrating device does not change along with the distance, the sensitivity and the frequency response of the volume sound source can be determined based on the collected data, therefore, the sensitivity and the frequency response can be used for calibrating in the use of the volume sound source, and the calibration of the volume sound source is realized.

Drawings

FIG. 1 is a block diagram showing a configuration of a device for calibrating a volume sound source according to an embodiment;

FIG. 2 is a schematic view of an acoustic waveguide in one embodiment;

fig. 3 is a block diagram showing a structure of a calibration apparatus for a volume sound source in another embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

With the development of the technology, the volume sound source is widely applied to the process of improving and optimizing the NVH (Noise, Vibration and Harshness) performance of products in the fields of automobiles, ships, airplanes and large machines, in particular to the process of Transmitting Path Analysis (TPA) of air sound or structure sound in Noise source identification, and the analysis method is divided into a direct method and a reciprocal method. The direct method is that a volume sound source is placed at a position which can generate energy excitation, and the response sound pressure level of each receiving point is measured; the reciprocity method uses the reciprocity principle, places a volume sound source at a sound vibration receiving point, measures at an excitation source using a microphone or an accelerometer, and then obtains a frequency response function from the noise source to the receiving point through an excited volume value Q and a measured sound pressure level P or acceleration a.

Specifically, the frequency response function obtained by the direct method is shown in formula (1):

in the above formula (1):

H_QP-the acoustic transfer function of the recipient to the noise source;

P_R-the sound pressure level of the recipient;

Q_S-the volume velocity of the noise source.

Furthermore, after the frequency response function of each possible transmission path is obtained, a main noise source is found through a transmission path analysis algorithm, and therefore the NVH performance of the product is optimally designed. The most common volume sound source is a volume velocity sound source, and besides, a volume acceleration sound source and a volume displacement sound source.

As can be seen from equation (1), in the Transmission Path Analysis (TPA), the magnitude of the volume velocity (or volume displacement, or volume acceleration) is directly related to the frequency response function of the analysis acoustic-acoustic or acoustic-vibration transmission path, and further affects the recognition result of the noise source, which puts requirements on the accuracy of the volume velocity value (or volume acceleration value, or volume displacement value) of the volume sound source. It will be appreciated that the reference volume velocity (or volume displacement or volume acceleration) is typically indicated when the product is shipped from the factory, but as the product is used, these parameters change, thus necessitating metrological calibration of the volume sound source.

In one embodiment of the present application, as shown in fig. 1, there is provided a calibration apparatus for a volumetric sound source, which includes a volumetric sound source 100, a sound wave guide 200, and a measurement and analysis module 300. Wherein, the volume sound source 100 is used for generating sound waves; one end of the sound wave guide 200 is connected to the volume sound source 100 for conducting sound waves; the operating frequency of the bulk acoustic source 100 is less than the cutoff frequency of the acoustic waveguide 200; the measurement and analysis module 300 is connected to the volume sound source 100 and the acoustic waveguide 200, and is configured to collect sound pressure and sound intensity when the sound wave is conducted through the acoustic waveguide 200, and an output voltage of the internal sensor when the volume sound source 100 conducts the sound wave through the acoustic waveguide.

In this application, the measured sound pressure, sound intensity and output voltage are used in combination to calibrate the sensitivity and frequency response of the bulk acoustic source.

In one embodiment, the volumetric sound source is a sound source having a geometric size. The acoustic waveguide may be used for acoustic conduction. In particular embodiments, the acoustic waveguide can be a rectangular acoustic waveguide, a cylindrical acoustic waveguide, or other acoustic waveguide that can achieve acoustic wave propagation in a one-dimensional plane. For example, FIG. 2 is a schematic view of an acoustic waveguide in one embodiment.

In a specific embodiment, the cutoff frequencies of different acoustic waveguides are calculated differently, and the calculation of the rectangular acoustic waveguide and the cylindrical acoustic waveguide is as follows:

cut-off frequency of rectangular acoustic waveguide:

in the above formula (2):

f_c-the cut-off frequency of the rectangular sound wave guide tube in Hz;

c₀-the speed of propagation of the sound waves in air, in m/s;

l_x,ythe larger of the rectangular acoustic duct cross-sectional width and height, in m.

Cut-off frequency of the cylindrical conduit:

in the above formula (3):

a-the cross-sectional radius of the cylindrical conduit, m.

It will be appreciated that based on the theoretical knowledge that sound waves exhibit one-dimensional planar sound waves for rectangular or cylindrical sound waveguides where the frequency of the sound wave is below the cutoff frequency of the sound waveguide, the sound waveguide can be selected to be of a size corresponding to the operating frequency of the volume sound wave, and the sound waveguide with a cutoff frequency above the operating frequency of the volume sound source can be obtained to calibrate the volume sound source.

In one embodiment, the cutoff frequency of the acoustic waveguide should be above the upper operating frequency limit of the bulk acoustic source; preferably, the cutoff frequency of the acoustic waveguide may be much higher than the upper operating frequency limit of the bulk acoustic source.

In one embodiment, the cross-sectional area of the acoustic waveguide is greater than the area of the sound outlet of the volumetric sound source, and the length of the acoustic waveguide is greater than one-half of the wavelength corresponding to the lower operating frequency limit of the volumetric sound source.

It should be noted that, according to the propagation characteristics of the one-dimensional plane acoustic wave, the sound pressure amplitude p (x, t) and the particle motion velocity amplitude v (x, t) of the one-dimensional plane acoustic wave do not change with the change of the propagation distance x, and when selecting the acoustic waveguide for calibrating the volume acoustic source, the working frequency range of the volume acoustic source needs to be considered, and the upper limit of the working frequency range of the volume acoustic source to be calibrated should be lower than, and preferably far lower than, the cut-off frequency of the acoustic waveguide, so that the acoustic wave radiated by the acoustic source in the acoustic waveguide is represented as the one-dimensional plane wave, and the propagation characteristics of the acoustic wave conform to the propagation characteristics of the one-dimensional plane acoustic wave.

The selection principle of the acoustic waveguide is therefore: according to the working frequency range of the calibrated volume sound source, the upper limit of the working frequency is represented by fH, and the lower limit of the working frequency is represented by fL, according to the formula (2) or the formula (3), the section size (height, width or radius) of the sound guide pipe is selected, so that the corresponding cut-off frequency of the sound guide pipe is higher than the upper limit of the working frequency fH, the section area of the sound guide pipe is larger than the area of the sound emitting port of the sound source, and the length of the sound guide pipe is larger than half of the wavelength corresponding to the lower limit of the working frequency fL of the volume sound source.

In one embodiment, the acoustic waveguide is a uniform cross-section waveguide made of a hard-walled material such as stainless steel.

In one embodiment, as shown in FIG. 3, the measurement and analysis module includes an acoustic intensity meter and a multi-channel acoustic analyzer; the sound intensity measuring instrument is connected with the other end of the two ends of the sound wave guide pipe; the first channel of the multi-channel acoustic analyzer is connected with the sound intensity measuring instrument and is used for collecting sound pressure and sound intensity of sound waves generated by the volume sound source when the sound waves are conducted in the sound wave guide pipe through the sound intensity measuring instrument; the second channel of the multi-channel acoustic analyzer is connected with the volume sound source and used for collecting the output voltage of the built-in sensor when the volume sound source transmits sound waves through the sound wave guide pipe.

It can be seen from fig. 3 that the volume sound source is disposed on one side of the sound wave guide tube, the sound intensity measuring instrument 301 is disposed on the other side of the sound wave guide tube, the output signal of the built-in sensor of the volume sound source is connected to the second channel of the multi-channel sound analyzer 302, and the output channel of the sound intensity measuring instrument 301 is connected to the first channel of the multi-channel sound analyzer 302.

In one embodiment, the measurement function of the first channel of the multi-channel acoustic analyzer is a self-power spectrum function of sound intensity and a self-power spectrum function of sound pressure when the sound wave propagates in the sound wave guide, and the measurement function of the second channel of the multi-channel acoustic analyzer is a self-power spectrum function of voltage of the built-in sensor when the volume sound source transmits the sound wave through the sound wave guide.

It can be understood that the first channel measurement function of the multi-channel acoustic analyzer can be set as an acoustic intensity power spectrum function and an acoustic pressure self-power spectrum function, so that the acoustic pressure and the acoustic intensity of the sound wave generated by the volume sound source when the sound wave is conducted in the sound wave guide tube can be acquired. The first channel measurement function of the multi-channel acoustic analyzer can be set as a voltage self-power spectrum function of the built-in sensor when the volume sound source transmits sound through the sound wave guide pipe, so that the output voltage of the built-in sensor when the volume sound source transmits sound through the sound wave guide pipe can be collected.

It should be noted that the first channel and the second channel of the multi-channel acoustic analyzer are both channels of the multi-channel acoustic analyzer, and the "first" and "second" are only used for distinction, and the two channels may be replaced.

In one embodiment, the customized function of the multi-channel acoustic analyzer is a particle motion velocity function, and the particle motion velocity function takes a sound intensity self-power spectrum function and a sound pressure self-power spectrum function as arguments. Therefore, the multi-channel acoustic analyzer can calculate a particle motion velocity function according to the sound intensity self-power spectrum function and the sound pressure self-power spectrum function during sound wave conduction

In one embodiment, the multi-channel acoustic analyzer is further configured to calculate a particle motion velocity magnitude across the acoustic waveguide cross-section based on the acoustic pressure and intensity; determining the sensitivity of the volume sound source after calibration according to the particle motion velocity amplitude and the output voltage; and determining the frequency response of the volume sound source after calibration according to the sensitivity of the volume sound source after calibration.

In one embodiment, the multi-channel acoustic analyzer is further configured to uniformly select a plurality of measurement points on a cross-section of the acoustic waveguide; taking the ratio of the sound intensity and the sound pressure of each measurement point under the reference frequency as a corresponding particle motion velocity amplitude; according to the particle motion velocity amplitude on the section under the reference frequency, the volume velocity sound source sensitivity after the volume sound source calibration under the reference frequency, the volume acceleration sound source sensitivity after the calibration and the volume displacement sound source sensitivity after the calibration are respectively determined.

In one embodiment, the multi-channel acoustic analyzer is further configured to obtain the calibrated sensitivity of the volume acoustic source at each operating frequency; and obtaining the frequency response of the volume sound source after calibration according to the deviation of the sensitivity of the volume sound source after calibration under each working frequency and the sensitivity of the volume sound source after calibration under the reference frequency.

Specifically, according to the propagation characteristics of the one-dimensional plane acoustic wave, the sound pressure amplitude p (x, t) and the particle motion velocity amplitude v (x, t) of the one-dimensional plane acoustic wave do not change with the change of the propagation distance x, so that a plurality of measurement points can be uniformly selected on the section of the acoustic waveguide, and the particle motion velocity of any section of the acoustic waveguide can be calculated. The particle motion speed is related to the sound intensity and the sound pressure of the one-dimensional plane sound wave, the sound intensity and the sound pressure of the one-dimensional plane sound wave can be measured by a sound intensity measuring instrument, and then the relationship between the sound intensity I and the sound pressure p of the one-dimensional plane sound wave and the particle motion speed v is based on: and v is I/p, and the particle motion velocity amplitude v of each measurement point is calculated_i。

Further, the average value of the particle motion velocity amplitude at each measurement point is takenParticle velocity amplitude for cross section:

where n is the number of measurement points.

In one embodiment, determining the sensitivity of a volume sound source based on the particle motion velocity magnitude and the output voltage comprises: according to the particle motion velocity amplitude on the section under the reference frequency, the volume velocity sound source sensitivity after the volume sound source calibration under the reference frequency, the volume acceleration sound source sensitivity after the calibration and the volume displacement sound source sensitivity after the calibration are respectively determined.

In particular, the volume velocity of the volume sound sourceCan be obtained by the following formula:

upper type (5)Wherein S is the cross-sectional area of the acoustic waveguide in m²。

Volumetric acceleration of a volumetric sound sourceCan be obtained by the following formula:

in the above formula (6), f is the operating frequency of the volume sound source and has a unit of Hz.

The volume displacement Q of the volume sound source can be obtained by:

specifically, in the transmission path analysis process, the volume parameter of the volume sound source is generally obtained by converting an electrical signal output by a microphone of the volume sound source itself, the output voltage of the microphone of the volume sound source is proportional to the volume parameter of the volume sound source, the volume parameter of the volume sound source includes volume velocity, volume acceleration and volume displacement, the proportional factor is the sensitivity of the volume sound source, and therefore, the calibration of the volume sound source is actually the calibration of the sensitivity of the internal sensor and the frequency response characteristic thereof.

According to the working principle and the characteristics of the volume sound source, the following 2 items are determined for the calibration parameters:

(1) volumetric sound source sensitivity at a reference frequency.

The volume sound source sensitivity includes a volume velocity sound source sensitivity, a volume acceleration sound source sensitivity, and a volume displacement sound source sensitivity. Wherein the volume velocity sound source sensitivity unit is V/(m)³The sensitivity unit of the sound source of the volume acceleration is V/(m)³/s²) And the volume displacement sound source sensitivity unit is V/m³。

(2) The volumetric sound source frequency response.

According to the calibration principle diagram shown in fig. 3, the volume sound source to be detected and the sound intensity measuring instrument are installed, the volume sound source is started to work under the reference frequency, and the reference frequency is selected according to the volume sound source specification. Measuring the average value of the particle motion speed of 5 points, collecting the output voltage amplitude U of the built-in sensor, and calculating the sensitivity of the volume velocity sound source according to the following formula:

for a volume acceleration sound source, the volume acceleration sound source sensitivity is calculated as follows:

for a volume-shifted sound source, the volume-shifted sound source sensitivity is calculated as:

in one embodiment, determining a calibrated frequency response of a volumetric sound source based on a sensitivity of the volumetric sound source comprises: acquiring the sensitivity of a volume sound source after calibration under each working frequency; and obtaining the frequency response of the volume sound source after calibration according to the deviation of the sensitivity of the volume sound source after calibration under each working frequency and the sensitivity of the volume sound source after calibration under the reference frequency.

Specifically, according to the calibration schematic diagram shown in fig. 3, the operating frequency of the volume sound source is changed, the sensitivity value of each frequency point of the volume sound source in the nominal operating frequency range of the volume sound source is measured, and the deviation of the sensitivity at each frequency point from the sensitivity at the reference frequency is the frequency response of the volume sound source.

The calibrating device for the volume sound source is based on the characteristic that sound waves are transmitted in the sound wave guide tube, namely, the sound waves are represented by the prior knowledge of one-dimensional plane sound waves when the sound wave frequency is lower than the cut-off frequency of the sound wave guide tube, the sound waves generated by the volume sound source to be calibrated are transmitted in the sound wave guide tube, then the sound pressure, the sound intensity and the output voltage of the built-in sensor are collected, according to the transmission characteristic of the one-dimensional plane sound waves, the sound pressure of the calibrating device does not change along with the distance, the sensitivity and the frequency response of the volume sound source can be determined based on the collected data, therefore, the sensitivity and the frequency response can be used for calibrating in the use of the volume sound source, and the calibration of the volume sound source is realized.

In other embodiments, all or part of the modules in the calibrating device of the volume sound source can be implemented by software, hardware and their combination. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.