CN113340409A - Method and device for calibrating volume sound source, computer equipment and storage medium - Google Patents
Method and device for calibrating volume sound source, computer equipment and storage medium Download PDFInfo
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Abstract
The application relates to a method, an apparatus, a computer device and a storage medium for calibrating a volume sound source. The method comprises the following steps: collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide; collecting output voltage of an internal sensor when the volume sound source conducts sound waves through the sound wave guide pipe; determining the sensitivity and frequency response of the volume sound source after calibration according to the sound pressure, the sound intensity and the output voltage; the sensitivity and the frequency response are used in the use of the volumetric sound source. By adopting the method, the volume sound source can be calibrated more effectively.
Description
Technical Field
The present application relates to the field of computer technologies, and in particular, to a method and an apparatus for calibrating a volume sound source, a computer device, and a storage medium.
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 method, an apparatus, a computer device and a storage medium for calibrating a volume sound source.
A method of calibrating a volumetric sound source, the method comprising:
collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide;
collecting output voltage of an internal sensor when the volume sound source conducts sound waves through the sound wave guide pipe;
determining the sensitivity and frequency response of the volume sound source after calibration according to the sound pressure, the sound intensity and the output voltage; the sensitivity and the frequency response are used in the use of the volumetric sound source.
In one embodiment, the acquiring sound pressure and sound intensity of sound waves generated by a volume sound source when conducted in a sound wave guide connected to the volume sound source comprises:
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 a sound intensity measuring instrument connected with one end of the sound wave guide pipe and a multi-channel sound analyzer connected with the sound intensity measuring instrument; the volume sound source is connected with the other end of the two ends of the sound wave guide pipe.
In one embodiment, said acquiring an output voltage of an internal transducer when said volumetric sound source conducts sound through said sound duct comprises:
collecting the output voltage amplitude of the built-in sensor when the volume sound source transmits sound waves through the sound wave guide pipe through the multi-channel sound analyzer; the first channel of the multichannel sound analyzer is connected with the sound intensity measuring instrument, and the second channel of the multichannel sound analyzer is connected with the volume sound source.
In one embodiment, the determining the calibrated sensitivity and frequency response of the volume sound source from the sound pressure, the sound intensity and the output voltage comprises:
calculating the particle motion velocity amplitude on the section of the acoustic waveguide according to the sound pressure and the sound 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.
In one embodiment, said calculating a particle velocity magnitude across said sonic duct cross-section from said acoustic pressure and said acoustic intensity comprises:
uniformly selecting a plurality of measuring points on the 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 obtaining the particle motion velocity amplitude on the cross section under the reference frequency according to the particle motion velocity amplitude of each measuring point.
In one embodiment, the determining the calibrated sensitivity of the volume sound source according to the particle motion velocity amplitude and the output voltage includes:
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 determining the calibrated frequency response of the volume sound source according to the sensitivity of the volume sound source includes:
acquiring the sensitivity of the 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 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.
An apparatus for calibrating a volumetric sound source, the apparatus comprising:
the acquisition module is used for acquiring sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide; collecting output voltage of an internal sensor when the volume sound source conducts sound waves through the sound wave guide pipe;
the calibration module is used for determining the sensitivity and the frequency response of the volume sound source after calibration according to the sound pressure, the sound intensity and the output voltage; the sensitivity and the frequency response are used in the use of the volumetric sound source.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide;
collecting output voltage of an internal sensor when the volume sound source conducts sound waves through the sound wave guide pipe;
determining the sensitivity and frequency response of the volume sound source after calibration according to the sound pressure, the sound intensity and the output voltage; the sensitivity and the frequency response are used in the use of the volumetric sound source.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide;
collecting output voltage of an internal sensor when the volume sound source conducts sound waves through the sound wave guide pipe;
determining the sensitivity and frequency response of the volume sound source after calibration according to the sound pressure, the sound intensity and the output voltage; the sensitivity and the frequency response are used in the use of the volumetric sound source.
Based on the characteristic that sound waves propagate in the sound wave guide tube, namely the prior knowledge that the sound waves are represented as one-dimensional plane sound waves when the frequency of the sound waves 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 propagated in the sound wave guide tube, then the sound pressure, the sound intensity and the output voltage of the built-in sensor are collected, and according to the characteristic that the sound pressure of the one-dimensional plane sound waves does not change along with the distance, the sensitivity and the frequency response of the volume sound source after calibration can be determined based on the collected data, so that the calibrated sensitivity and the calibrated frequency response can be applied in the subsequent use of the volume sound source.
Drawings
FIG. 1 is a schematic flow chart of a method for calibrating a volumetric sound source according to an embodiment;
FIG. 2 is a schematic view of an acoustic waveguide in one embodiment;
FIG. 3 is a schematic diagram of the calibration of a volumetric sound source in one embodiment;
FIG. 4 is a schematic diagram of measurement point selection in one embodiment;
FIG. 5 is a block diagram showing a configuration of a calibration apparatus for a volume sound source according to an embodiment;
FIG. 6 is a diagram illustrating an internal structure of a computer device according to an 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.
In one embodiment, as shown in fig. 1, a method for calibrating a volume sound source is provided, which is described by taking the method as an example applied to a computer device, where the computer device may be a terminal or a server, the terminal may be, but is not limited to, various personal computers, laptops, smartphones, tablets and portable wearable devices, and the server may be implemented by a stand-alone server or a server cluster consisting of a plurality of servers. The calibration method of the volume sound source comprises the following steps:
step 102, collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume source is less than the cutoff frequency of the acoustic waveguide.
Wherein the volume sound source has a geometrical size of the sound source. The acoustic waveguide may be used for acoustic conduction. Such as a rectangular acoustic waveguide or a cylindrical waveguide. FIG. 2 is a schematic view of an acoustic waveguide in one embodiment.
In a specific embodiment, the cutoff frequency of the sonic wave guide is calculated as follows:
cut-off frequency of rectangular acoustic waveguide:
in the above formula:
fc-the cut-off frequency of the rectangular sound wave guide tube in Hz;
c0the sound waves being in airThe propagation speed of (a) is in m/s;
lx,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:
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, acquiring sound pressure and sound intensity of sound waves generated by a volumetric sound source as they are conducted in a sound waveguide connected to the volumetric sound source comprises: collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in the sound wave guide tube through a sound intensity measuring instrument connected with one end of the sound wave guide tube and a multi-channel sound analyzer connected with the sound intensity measuring instrument; the volume sound source is connected to the other of the two ends of the acoustic waveguide.
Referring to fig. 3, a schematic diagram of the calibration of a volumetric sound source in one embodiment is shown. It can be seen from fig. 3 that the volume sound source is placed on one side of the sound wave guide tube, the sound intensity measuring instrument is placed 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 first channel of the multi-channel sound analyzer, and the output channel of the sound intensity measuring instrument is connected to the second channel of the multi-channel sound analyzer. The computer device may set the second channel measurement function of the multi-channel acoustic analyzer to a self-power spectral function of sound intensity and a self-power spectral function of sound pressure. Therefore, the sound pressure and the sound 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.
And 104, acquiring 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, acquiring an output voltage of an internal transducer when a volumetric sound source conducts sound through a sound duct, comprises: acquiring the output voltage amplitude of the built-in sensor when a volume sound source transmits sound waves through a sound wave guide pipe through a multi-channel sound analyzer; the first channel of the multi-channel acoustic analyzer is connected with the sound intensity measuring instrument, and the second channel of the multi-channel acoustic analyzer is connected with the volume sound source.
With continued reference to fig. 3, the computer device may set a self-power spectral function of the second channel measurement voltage of the multi-channel acoustic analyzer. Therefore, the output voltage of the built-in sensor can be acquired when the volume sound source transmits sound waves through the sound wave guide pipe. Wherein, the sensor in the volume sound source can also be a microphone carried by the volume sound source.
It will be appreciated that the first and second channels of the multi-channel acoustic analyser are both channels of the multi-channel acoustic analyser and that "first" and "second" are for distinction only and may be replaced.
In one embodiment, determining the calibrated sensitivity and frequency response of the volumetric sound source from the sound pressure, sound intensity and output voltage comprises: calculating the particle motion velocity amplitude on the section of the sound wave guide pipe according to the sound pressure and the sound 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.
In one embodiment, calculating a particle motion velocity magnitude across a section of the sonic duct based on sound pressure and sound intensity comprises: uniformly selecting a plurality of measuring points on the 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; and obtaining the particle motion velocity amplitude on the cross section under the reference frequency according to the particle motion velocity amplitude of each measurement point.
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 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 as shown in fig. 4. 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 calculatedi。
Further, the average value of the particle motion velocity amplitude at each measurement point is taken
Particle 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 source
Can be obtained by the following formula:
in the above formula, the first and second carbon atoms are,s is the cross-sectional area of the acoustic waveguide in m2。
Volumetric acceleration of a volumetric sound source
Can be obtained by the following formula:
in the above formula, f is the operating frequency of the volume sound source and is in 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) volume sound source sensitivity at a reference frequency (volume velocity sound source sensitivity unit: V/(m3/s), volume acceleration sound source sensitivity unit: V/(m3/s2), volume displacement sound source sensitivity unit: V/m 3).
(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.
According to the calibration method of the volume sound source, based on the characteristic that sound waves are transmitted in the sound wave guide tube, namely the prior knowledge that the sound waves are expressed as 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, the sound pressure, the sound intensity and the output voltage of the built-in sensor are further collected, according to the characteristic that the sound pressure of the one-dimensional plane sound waves does not change along with the distance, the sensitivity and the frequency response of the volume sound source after calibration can be determined based on the collected data, and therefore the calibrated sensitivity and the frequency response can be applied in the subsequent use of the volume sound source.
The method for calibrating the volume sound source based on the sound wave guide tube can calibrate various volume sound sources including a volume velocity sound source, a volume displacement sound source, a volume acceleration sound source and volume sound sources with various frequency ranges and overall sizes.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In one embodiment, as shown in fig. 5, there is provided an apparatus for calibrating a volume sound source, which may be a part of a computer device using a software module or a hardware module, or a combination of the two modules, the apparatus specifically comprising: an acquisition module 501 and a calibration module 502, wherein,
the acquisition module 501 is used for acquiring sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide; collecting output voltage of a built-in sensor when a volume sound source transmits sound waves through a sound wave guide pipe;
a calibration module 502, configured to determine, according to the sound pressure, the sound intensity, and the output voltage, a sensitivity and a frequency response of the volume sound source after calibration; sensitivity and frequency response are used in the use of a volumetric sound source.
In one embodiment, the acquisition module 501 is further configured to acquire 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 tube through a sound intensity measuring instrument connected to one end of the sound wave guide tube and a multi-channel sound analyzer connected to the sound intensity measuring instrument; the volume sound source is connected to the other of the two ends of the acoustic waveguide.
In one embodiment, the acquisition module 501 is further configured to acquire, by the multi-channel acoustic analyzer, an output voltage amplitude of the internal sensor when the volume sound source transmits sound through the sound guide; the first channel of the multi-channel acoustic analyzer is connected with the sound intensity measuring instrument, and the second channel of the multi-channel acoustic analyzer is connected with the volume sound source.
In one embodiment, the calibration module 502 is further configured to calculate a particle 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.
In one embodiment, calibration module 502 is further configured to pick a plurality of measurement points uniformly across the 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; and obtaining the particle motion velocity amplitude on the cross section under the reference frequency according to the particle motion velocity amplitude of each measurement point.
In one embodiment, the calibration module 502 is further configured to determine a calibrated volume velocity sound source sensitivity, a calibrated volume acceleration sound source sensitivity, and a calibrated volume displacement sound source sensitivity of the volume sound source at the reference frequency according to the particle motion velocity amplitude values on the cross section at the reference frequency.
In one embodiment, the calibration module 502 is further configured to obtain the calibrated sensitivity of the volume sound 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.
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 prior knowledge that the sound waves are represented by 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 characteristic that the sound pressure of the one-dimensional plane sound waves does not change along with the distance, the calibrated sensitivity and frequency response of the volume sound source can be determined based on the collected data, and therefore the calibrated sensitivity and frequency response can be applied to subsequent use of the volume sound source.
For the specific definition of the calibration means of the volume sound source, reference may be made to the above definition of the calibration method of the volume sound source, which is not described herein again. The modules in the calibration device for the volume sound source can be wholly or partially realized by software, hardware and a combination thereof. 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.
In one embodiment, a computer device is provided, the internal structure of which may be as shown in FIG. 6. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing the collected related data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a method of calibrating a volumetric sound source. Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program: collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide; collecting output voltage of a built-in sensor when a volume sound source transmits sound waves through a sound wave guide pipe; determining the sensitivity and frequency response of the volume sound source after calibration according to the sound pressure, the sound intensity and the output voltage; sensitivity and frequency response are used in the use of a volumetric sound source.
In one embodiment, acquiring sound pressure and sound intensity of sound waves generated by a volumetric sound source as they are conducted in a sound waveguide connected to the volumetric sound source comprises: collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in the sound wave guide tube through a sound intensity measuring instrument connected with one end of the sound wave guide tube and a multi-channel sound analyzer connected with the sound intensity measuring instrument; the volume sound source is connected to the other of the two ends of the acoustic waveguide.
In one embodiment, acquiring an output voltage of an internal transducer when a volumetric sound source conducts sound through a sound duct, comprises: acquiring the output voltage amplitude of the built-in sensor when a volume sound source transmits sound waves through a sound wave guide pipe through a multi-channel sound analyzer; the first channel of the multi-channel acoustic analyzer is connected with the sound intensity measuring instrument, and the second channel of the multi-channel acoustic analyzer is connected with the volume sound source.
In one embodiment, determining the calibrated sensitivity and frequency response of the volumetric sound source from the sound pressure, sound intensity and output voltage comprises: calculating the particle motion velocity amplitude on the section of the sound wave guide pipe according to the sound pressure and the sound 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.
In one embodiment, calculating a particle motion velocity magnitude across a section of the sonic duct based on sound pressure and sound intensity comprises: uniformly selecting a plurality of measuring points on the 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; and obtaining the particle motion velocity amplitude on the cross section under the reference frequency according to the particle motion velocity amplitude of each measurement point.
In one embodiment, determining the calibrated sensitivity of the volume acoustic source based on the particle 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 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.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of: collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide; collecting output voltage of a built-in sensor when a volume sound source transmits sound waves through a sound wave guide pipe; determining the sensitivity and frequency response of the volume sound source after calibration according to the sound pressure, the sound intensity and the output voltage; sensitivity and frequency response are used in the use of a volumetric sound source.
In one embodiment, acquiring sound pressure and sound intensity of sound waves generated by a volumetric sound source as they are conducted in a sound waveguide connected to the volumetric sound source comprises: collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in the sound wave guide tube through a sound intensity measuring instrument connected with one end of the sound wave guide tube and a multi-channel sound analyzer connected with the sound intensity measuring instrument; the volume sound source is connected to the other of the two ends of the acoustic waveguide.
In one embodiment, acquiring an output voltage of an internal transducer when a volumetric sound source conducts sound through a sound duct, comprises: acquiring the output voltage amplitude of the built-in sensor when a volume sound source transmits sound waves through a sound wave guide pipe through a multi-channel sound analyzer; the first channel of the multi-channel acoustic analyzer is connected with the sound intensity measuring instrument, and the second channel of the multi-channel acoustic analyzer is connected with the volume sound source.
In one embodiment, determining the calibrated sensitivity and frequency response of the volumetric sound source from the sound pressure, sound intensity and output voltage comprises: calculating the particle motion velocity amplitude on the section of the sound wave guide pipe according to the sound pressure and the sound 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.
In one embodiment, calculating a particle motion velocity magnitude across a section of the sonic duct based on sound pressure and sound intensity comprises: uniformly selecting a plurality of measuring points on the 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; and obtaining the particle motion velocity amplitude on the cross section under the reference frequency according to the particle motion velocity amplitude of each measurement point.
In one embodiment, determining the calibrated sensitivity of the volume acoustic source based on the particle 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 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.
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), for example.
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.
Claims (10)
1. A method of calibrating a volumetric sound source, the method comprising:
collecting sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide;
collecting output voltage of an internal sensor when the volume sound source conducts sound waves through the sound wave guide pipe;
determining the sensitivity and frequency response of the volume sound source after calibration according to the sound pressure, the sound intensity and the output voltage; the sensitivity and the frequency response are used in the use of the volumetric sound source.
2. The method of claim 1, wherein collecting the sound pressure and intensity of sound waves generated by a volumetric sound source as they are conducted in a sound waveguide connected to the volumetric sound source comprises:
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 a sound intensity measuring instrument connected with one end of the sound wave guide pipe and a multi-channel sound analyzer connected with the sound intensity measuring instrument; the volume sound source is connected with the other end of the two ends of the sound wave guide pipe.
3. The method of claim 2, wherein said acquiring an output voltage of a built-in sensor when said volumetric sound source conducts sound through said sound duct comprises:
collecting the output voltage amplitude of the built-in sensor when the volume sound source transmits sound waves through the sound wave guide pipe through the multi-channel sound analyzer; the first channel of the multichannel sound analyzer is connected with the sound intensity measuring instrument, and the second channel of the multichannel sound analyzer is connected with the volume sound source.
4. The method of claim 1, wherein said determining a calibrated sensitivity and frequency response of said volumetric sound source from said sound pressure, said sound intensity and said output voltage comprises:
calculating the particle motion velocity amplitude on the section of the acoustic waveguide according to the sound pressure and the sound 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.
5. The method of claim 4, wherein said calculating a particle velocity magnitude across said acoustic waveguide cross-section from said acoustic pressure and said acoustic intensity comprises:
uniformly selecting a plurality of measuring points on the 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 obtaining the particle motion velocity amplitude on the cross section under the reference frequency according to the particle motion velocity amplitude of each measuring point.
6. The method of claim 5, wherein determining the calibrated sensitivity of the volumetric sound source based on the particle motion velocity magnitude and the output voltage comprises:
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.
7. The method of claim 5, wherein determining the calibrated frequency response of the volumetric sound source based on the sensitivity of the volumetric sound source comprises:
acquiring the sensitivity of the 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 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.
8. An apparatus for calibrating a volumetric sound source, the apparatus comprising:
the acquisition module is used for acquiring sound pressure and sound intensity of sound waves generated by a volume sound source when the sound waves are conducted in a sound wave guide pipe connected with the volume sound source; the operating frequency of the volume sound source is less than the cutoff frequency of the acoustic waveguide; collecting output voltage of an internal sensor when the volume sound source conducts sound waves through the sound wave guide pipe;
the calibration module is used for determining the sensitivity and the frequency response of the volume sound source after calibration according to the sound pressure, the sound intensity and the output voltage; the sensitivity and the frequency response are used in the use of the volumetric sound source.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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