Method for determining size of microphone probe

Abstract

The invention relates to the technical field of microphones, and provides a method for determining the size of a microphone probe, which comprises the following steps: determining the width of a gap formed in the side surface of the microphone probe according to the size of a to-be-tested sample, the microphone probe being connected with a recording part of a microphone, and the microphone being used for performing an acoustic test on the to-be-tested sample; determining the radius of a microphone probe and the target length range of the microphone probe according to the diameter of the microphone; based on the gap width, the microphone probe radius and the target length range, a plurality of simulation models of different target lengths corresponding to the microphone probe are constructed, the corresponding sound transmission efficiency is calculated, the optimal probe length is obtained, and the gap length of each simulation model is equal to the corresponding target length; the dimensions of the microphone probe include a slot width, a microphone probe radius, and an optimal probe length. The problems that the production cost is low and the testing efficiency and accuracy are high while the microphone is difficult to be protected from being damaged by a large-particle sample in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of microphones, and in particular to a method for determining the size of a microphone probe. Background Art

[0002] During the process of acoustic testing of particulate samples, the problem of foreign objects entering the microphone has always existed, which not only affects the test results but may also damage the microphone device.

[0003] Currently, the market uses waterproof sound-permeable membranes, electric field adsorption technology, dust-proof nets or electric field combination technology to protect the microphone, which can effectively resist the invasion of dust on the microphone. However, when testing large particulate samples, such as corn kernel samples or soybean samples, the above-mentioned related technologies are difficult to effectively prevent the large particulate samples from blocking on the outer shell of the microphone. Even when making adaptive adjustments for large particulate samples, there are problems of large signal transmission loss and poor assembly flexibility, resulting in high costs for mass production, as well as low test efficiency and accuracy.

[0004] Regarding the problem that the related technologies are difficult to protect the microphone from damage by large particulate samples while taking into account low production costs, high test efficiency and high accuracy, no effective solution has been proposed yet. Summary of the Invention

[0005] The method for determining the size of a microphone probe provided by the embodiments of the present invention can at least solve the problem that the related technologies are difficult to protect the microphone from damage by large particulate samples while taking into account low production costs, high test efficiency and high accuracy.

[0006] The embodiments of the present invention provide a method for determining the size of a microphone probe, including: determining the width of the gap of the microphone probe according to the size of the sample to be measured, wherein the gap is opened on the side surface of the microphone probe, the microphone probe is connected to the recording component of the microphone, and the microphone is used for acoustic testing of the sample to be measured; determining the radius of the microphone probe and the target length range of the microphone probe according to the diameter of the microphone; based on the width of the gap, the radius of the microphone probe, and the target length range, constructing a plurality of simulation models of the microphone probe corresponding to different target lengths, calculating the sound transmission efficiency of each simulation model, and obtaining the optimal probe length, wherein the target length is the length in the target length range, and the length of the gap of each simulation model is equal to the corresponding target length; the size of the microphone probe includes the width of the gap, the radius of the microphone probe, and the optimal probe length.

[0007] The embodiments of the present invention provide a method for determining the size of a microphone probe. The method for calculating the sound transmission efficiency of each simulation model includes: calculating the side-slit sound transmission efficiency of each simulation model based on the width of the slit, the radius of the microphone probe, and the target length corresponding to each simulation model; determining the sound wave attenuation factor and the sound wave phase delay of each simulation model based on the radius of the microphone probe and the target length corresponding to each simulation model; determining the transfer function of each simulation model based on the side-slit sound transmission efficiency, the sound wave attenuation factor, and the sound wave phase delay, and calculating the sound transmission efficiency of each simulation model.

[0008] The embodiments of the present invention provide a method for determining the size of a microphone probe. Based on the width of the slit, the radius of the microphone probe, and the target length corresponding to each simulation model, calculating the side-slit sound transmission efficiency of each simulation model includes: calculating the slit area of each simulation model based on the width of the slit and the target length corresponding to each simulation model; calculating the cross-sectional area of the microphone probe based on the radius of the microphone probe; determining the side-slit sound transmission efficiency of each simulation model based on the ratio of the slit area to the cross-sectional area of each simulation model.

[0009] The embodiments of the present invention provide a method for determining the size of a microphone probe. Based on the radius of the microphone probe and the target length corresponding to each simulation model, determining the sound wave attenuation factor and the sound wave phase delay of each simulation model includes: based on the radius a of the microphone probe and the target length x corresponding to each simulation model, determining the sound wave attenuation factor of each simulation model , ; where represents the natural constant, represents the angular frequency of the sound wave, represents the air viscosity, represents the air density; based on the target length x corresponding to each simulation model, determining the sound wave phase delay of each simulation model ; where represents the imaginary unit, represents the wave number.

[0010] The embodiments of the present invention provide a method for determining the size of a microphone probe. Based on the side-slit sound transmission efficiency, the sound wave attenuation factor, and the sound wave phase delay, determining the transfer function of each simulation model and calculating the sound transmission efficiency of each simulation model includes: calculating the transfer function of each simulation model according to the following formula : ; where represents the side-slit sound transmission efficiency corresponding to each simulation model, represents the sound wave attenuation factor corresponding to each simulation model, Represents the acoustic phase delay corresponding to each simulation model; based on the numerical calculation algorithm, and the transfer function of each simulation model , calculate the sound transmission efficiency of each simulation model.

[0011] An embodiment of the present invention provides a method for determining the size of a microphone probe, which determines the radius of the microphone probe and the target length range of the microphone probe based on the diameter of the microphone, including: determining the radius of the microphone probe based on 0.4-0.45 times the diameter of the microphone; determining the maximum value of the target length range based on 2 times the diameter of the microphone; and determining the target length range based on preset minimum and maximum values.

[0012] An embodiment of the present invention provides a method for determining the size of a microphone probe. After obtaining the optimal probe length, the method further includes: determining the size of the target gap based on the width of the gap and the optimal probe length; determining the number of target gaps based on the strength requirements of the microphone probe; wherein the size of the microphone probe includes the size and number of the target gaps.

[0013] The present invention also provides a non-transitory machine-readable medium storing computer instructions, where the computer instructions are used to enable a computer to execute any of the above-mentioned size determination methods.

[0014] The present invention also provides an electronic device, wherein the program includes instructions, and when the instructions are executed by a processor, the processor executes any of the above-mentioned size determination methods.

[0015] The present invention also provides a method for manufacturing a microphone probe, comprising: determining the size of the microphone probe according to any of the above-mentioned size determination methods; and manufacturing the microphone probe based on the size of the microphone probe.

[0016] The invention provides a method for determining the size of a microphone probe, which determines the width of a gap of the microphone probe according to the size of a sample to be tested, thereby preventing large particles of the sample to be tested from clogging the microphone.

[0017] The gap is opened on the side of the microphone probe. Compared with the case where the gap is opened at the top end of the microphone probe, that is, the end of the microphone probe far from the microphone, it can reduce the limitation of the cross-sectional area of the microphone probe on the gap area, so that the side-gap sound transmission efficiency can be improved by increasing the gap area. The length of the gap of the microphone probe is equal to the corresponding target length, which can characterize the side-gap sound transmission efficiency, the acoustic wave attenuation factor and the acoustic wave phase delay inside the microphone probe through a single variable of the target length of the microphone probe, reducing the calculation difficulty of the sound transmission efficiency of the simulation model of the microphone probe. At the same time, the longer the target length, the higher the side-gap sound transmission efficiency, but the greater the loss caused by the acoustic wave attenuation factor and the acoustic wave phase delay. Therefore, among multiple target lengths, there is an optimal probe length with the highest sound transmission efficiency, so that the finally determined microphone probe can improve the detection accuracy of the microphone.

[0018] In addition, determining the radius of the microphone probe according to the diameter of the microphone helps to manufacture a microphone probe that supports plug-and-play subsequently. The dimensions of the microphone probe include the gap width, the radius, and the optimal probe length, with a simple and flexible structure. On the one hand, it can significantly reduce the cost of mass production, and on the other hand, it is convenient for the microphone to test the sample to be measured, thereby improving the test efficiency of the microphone.

[0019] In summary, a method for determining the dimensions of a microphone probe provided by an embodiment of the present invention can solve the problem that it is difficult to protect the microphone from damage by large-particle samples in the related art while taking into account relatively low production costs, relatively high test efficiency and accuracy. Description of the Drawings

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other embodiments based on these drawings without creative efforts.

[0021] Figure 1 It is a flowchart of the steps of a method for determining the dimensions of a microphone probe in an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of the test results of the influence of a microphone probe with a length of 5 mm to 50 mm on the microphone to obtain a recording signal in an embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram of the test results of the influence of the opening positions where the gaps are located 1 mm - 39 mm away from the end of the microphone probe on the microphone to obtain a recording signal in an embodiment of the present invention.

[0024] Figure 4 It is a schematic diagram of the test results of the influence of a slit with a length of 1 mm to 45 mm on the microphone for obtaining a recording signal in an embodiment of the present invention.

[0025] Figure 5 It is a schematic diagram of the test results of the influence of a microphone probe on the microphone for obtaining a recording signal at a sound wave frequency of 1000 - 2000 Hz in an embodiment of the present invention.

[0026] Figure 6 It is a schematic diagram of the test results of the influence of a microphone probe on the microphone for obtaining a recording signal at a sound wave frequency of 5000 - 6000 Hz in an embodiment of the present invention.

[0027] Figure 7 It is a schematic diagram of the result of the simulation comparison of the microphone probe lengths of 6 mm and 10 mm in an embodiment of the present invention.

[0028] Figure 8 It is a schematic diagram of the result of the actual measurement comparison of the microphone probe lengths of 6 mm and 10 mm in an embodiment of the present invention.

[0029] Figure 9 It is a schematic diagram of the test results of using a half microphone in an embodiment of the present invention.

[0030] Figure 10 It is a schematic diagram of the test results of using an eighth microphone in an embodiment of the present invention.

[0031] Figure 11 It is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. Detailed implementation manners

[0032] Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0033] Currently, in the market, waterproof sound-permeable membranes, electrokinetic adsorption technologies, dust-proof nets, or electrokinetic combination technologies are used to protect microphones, which can effectively resist the invasion of dust on microphones. However, when testing large-particle samples, such as corn kernel samples or soybean samples, the above-mentioned related technologies are difficult to effectively prevent large-particle samples from clogging on the outer shell of the microphone. Even if adaptive adjustments are made for large-particle samples, there are still problems of large signal transmission loss and poor assembly flexibility, resulting in high costs for mass production, as well as low test efficiency and accuracy.

[0034] For this reason, please refer to Figure 1 As shown, the embodiment of the present invention provides a method for determining the size of a microphone probe, including step S101 to step S103.

[0035] Step S101, determine the width of the gap of the microphone probe according to the size of the sample to be measured, wherein the gap is opened on the side surface of the microphone probe, the microphone probe is connected to the recording component of the microphone, and the microphone is used for acoustic testing of the sample to be measured.

[0036] Step S102, determine the radius of the microphone probe and the target length range of the microphone probe according to the diameter of the microphone.

[0037] Step S103, based on the width of the gap, the radius of the microphone probe, and the target length range, construct multiple simulation models of the microphone probe corresponding to different target lengths, calculate the sound transmission efficiency of each simulation model, and obtain the optimal probe length, wherein the target length is the length in the target length range, and the length of the gap of each simulation model is equal to the corresponding target length; the size of the microphone probe includes the width of the gap, the radius of the microphone probe, and the optimal probe length.

[0038] It can be understood that the sample to be measured includes but is not limited to large-particle samples, such as soybean samples and corn kernel samples. The "large" of the large particles is relative to dust.

[0039] The size of the sample to be measured needs to be determined by those skilled in the art according to prior values and actual situations.

[0040] For example, when the shape of the sample to be measured is granular or approximately spherical, the size of the sample to be measured is the diameter or thickness of the sample to be measured. Considering that there may be a large difference in size between individuals of the same type of sample to be measured, in order to accurately determine the width of the gap of the microphone probe and avoid the sample to be measured from clogging the microphone and the microphone probe, the above-mentioned size of the sample to be measured is the average diameter or average thickness of the sample to be measured.

[0041] It can be understood that when the slit of the microphone probe is opened at the top end, that is, the end of the microphone probe far from the microphone, the area of the slit cannot exceed the cross-sectional area of the microphone probe, which is not conducive to improving the sound transmission efficiency of the slit. Therefore, the slit of the microphone probe in this embodiment is opened on the side of the microphone probe. Among them, when the above-mentioned slit is opened on the side of the microphone probe, the above-mentioned sound transmission efficiency of the slit is expressed as the sound transmission efficiency of the side slit, and the description of the sound transmission efficiency of the side slit will be specifically introduced later.

[0042] In addition, the width of the slit of the microphone probe in this embodiment needs to be smaller than the size of the sample to be measured to avoid blockage. However, if the width is too small, the area of the slit will be too small, resulting in a reduction in the sound transmission efficiency of the side slit of the microphone probe. Therefore, in this embodiment, it is preferably to use 0.85 - 0.95 times the average diameter of the sample to be measured as the width of the slit of the microphone probe. For example, 0.85 times, 0.9 times, 0.95 times.

[0043] It can be understood that the size of the slit area is also positively correlated with the length of the slit. When the width of the slit has been determined, the longer the slit, the larger the slit area, and the higher the sound transmission efficiency of the side slit.

[0044] Considering that when using a microphone to perform an acoustic test on a sample to be measured, the microphone probe needs to be inserted into the pile of samples to be measured, which requires the microphone probe to have necessary structural strength. For this reason, in this embodiment, it is preferably to open a linear slit on the microphone probe. One end of the above-mentioned linear slit is close to the connection between the microphone probe and the recording component of the microphone, and the other end is close to the top end of the microphone probe, that is, the end of the microphone probe far from the microphone.

[0045] Compared with spiral or other shaped slits, the above-mentioned linear slit has higher structural strength and lower processing difficulty. Obviously, different materials of the microphone probe will also affect the structural strength of the microphone probe. Regarding the structural strength of the microphone probe, the shape and number of the slits will be further described later.

[0046] It can be understood that the lengths of the slits of each simulation model are equal to the corresponding target lengths, and the sound transmission efficiency of the side slit related to the slit length and the internal loss of the probe related to the target length of the microphone probe can be characterized by this one variable of the target length, thereby reducing the calculation difficulty of the sound transmission efficiency of the simulation model of the microphone probe. Among them, the internal loss of the probe includes the loss caused by the acoustic wave attenuation factor and the loss caused by the acoustic wave phase delay. The specific corresponding relationship between the target length and the acoustic wave attenuation factor and the acoustic wave phase delay will be further described later.

[0047] It can be understood that those skilled in the art can determine the radius of the microphone probe and the target length range of the microphone probe based on the prior value and the actual situation according to the diameter of the microphone. Preferred examples will be given later in this embodiment.

[0048] It can be understood that the target length is the length within the target length range. The more the number of target lengths, the more accurate the obtained optimal probe length. However, too many target lengths will increase the calculation time. Therefore, those skilled in the art need to select a reasonable number of target lengths.

[0049] For example, when the accuracy requirement for the optimal probe length is relatively low, the number of target lengths is selected to be three. When the accuracy requirement for the optimal probe length is relatively high, the number of target lengths is selected to be four to seven.

[0050] In summary, the method for determining the size of the microphone probe provided in this embodiment determines the width of the gap of the microphone probe according to the size of the sample to be measured, which can prevent large-particle samples to be measured from blocking the microphone. The gap is opened on the side of the microphone probe, which is beneficial to improving the sound transmission efficiency of the side gap.

[0051] The length of the gap of the microphone probe is equal to the corresponding target length, which can characterize the sound transmission efficiency of the side gap, the acoustic wave attenuation factor and the acoustic wave phase delay inside the microphone probe through this one variable of the target length of the microphone probe, reducing the calculation difficulty of the sound transmission efficiency of the simulation model of the microphone probe. At the same time, the longer the target length, the higher the sound transmission efficiency of the side gap, but the greater the loss caused by the acoustic wave attenuation factor and the acoustic wave phase delay. Therefore, there is an optimal probe length with the highest sound transmission efficiency among multiple target lengths, so that the finally determined microphone probe can improve the detection accuracy of the microphone.

[0052] In addition, determining the radius of the microphone probe according to the diameter of the microphone helps to manufacture a microphone probe that supports plug-and-play later. The size of the microphone probe includes the gap width, the probe radius, and the optimal probe length, with a simple and flexible structure. On the one hand, it can significantly reduce the cost of mass production, and on the other hand, it is convenient for the microphone to test the sample to be measured, thereby improving the test efficiency of the microphone.

[0053] In other words, the above method for determining the size of the microphone probe can solve the problem that it is difficult in the related art to protect the microphone from damage by large-particle samples while taking into account relatively low production costs, relatively high test efficiency and accuracy.

[0054] Specifically, before step S101, the method for determining the size of the microphone probe further includes step S100 of obtaining the size of the sample to be measured and the diameter of the microphone, specifically: measuring the size of the sample to be measured and the diameter of the microphone.

[0055] Alternatively, based on the variety type of the sample to be measured, look up the corresponding size in the standard database for the variety type of the sample to be measured. Based on the type of the microphone, look up the corresponding diameter in the standard database for the type of the microphone.

[0056] Among them, the standard database includes the sizes corresponding to multiple different varieties of samples to be measured, and the diameters corresponding to multiple types of microphones.

[0057] For example, the types of microphones include half-inch microphones, quarter-inch microphones, one-sixth-inch microphones, and one-eighth-inch microphones.

[0058] A half-inch microphone, that is, a 1 / 2-inch microphone, has a diameter of 12.7 mm.

[0059] A quarter-inch microphone, that is, a 1 / 4-inch microphone, has a diameter of 6.35 mm.

[0060] A one-sixth-inch microphone, that is, a 1 / 6-inch microphone, has a diameter of 4.23 mm.

[0061] A one-eighth-inch microphone, that is, a 1 / 8-inch microphone, has a diameter of 3.175 mm.

[0062] Preferably, in step S102, determining the radius of the microphone probe and the target length range of the microphone probe according to the diameter of the microphone includes steps S1021 to S1023.

[0063] Step S1021, determine the radius of the microphone probe according to 0.4 - 0.45 times the diameter of the microphone.

[0064] For example, the radius of the microphone probe is 0.4 times the diameter of the microphone.

[0065] Alternatively, the radius of the microphone probe is 0.45 times the diameter of the microphone.

[0066] It can be understood that the larger the radius of the microphone probe, the larger the cross-sectional area of the microphone probe. When the side seam area of the microphone probe remains unchanged, the sound transmission efficiency of the side seam of the microphone probe is smaller.

[0067] When the radius of the microphone probe is 0.4 - 0.45 times the diameter of the microphone, on the one hand, it can have a relatively large side seam sound transmission efficiency, and on the other hand, it is convenient to manufacture a plug-and-play microphone probe to improve the efficiency and flexibility of microphone acoustic testing.

[0068] Step S1022, determine the maximum value of the target length range according to 2 times the diameter of the microphone.

[0069] Refer to the sound propagation attenuation formula in a circular pipe: ; Among them, represents the attenuation coefficient, with the unit of Np / m; represents the angular frequency, with the unit of rad / s; represents the medium density, with the unit of kg / m 3 ; represents the sound speed, with the unit of m / s; represents the pipe radius, with the unit of m; represents the dynamic viscosity, with the unit of Pa s; represents the specific heat ratio; represents the thermal conductivity, with the unit of W / (m K); represents the Prandtl number.

[0070] It can be understood that the larger the diameter of the microphone, that is, the larger the pipe radius R, the smaller the attenuation coefficient , the smaller the loss of the sound wave during transmission in the microphone. However, the larger the diameter of the microphone, the larger the radius of the microphone probe. With the gap area of the microphone probe remaining unchanged, the side-gap transmission efficiency of the microphone probe is smaller. Therefore, it is necessary to increase the target length of the microphone probe to increase the gap area and improve the side-gap transmission efficiency.

[0071] In other words, the target length of the microphone probe needs to increase with the increase in the diameter of the microphone. The optimal probe length of the microphone probe is positively correlated with the diameter of the microphone. Therefore, in this embodiment, it is preferably to determine the maximum value of the target length range based on the diameter of the microphone.

[0072] It can be understood that when the maximum value of the target length range is twice the diameter of the microphone, it is helpful to obtain an accurate optimal probe length.

[0073] In addition, those skilled in the art can also determine the maximum value of the target length range based on 3 - 5 times the diameter of the microphone and correspondingly increase the number of target lengths, so as to further improve the accuracy of the obtained optimal probe length.

[0074] Step S1023, determine the target length range based on the preset minimum value and maximum value.

[0075] It can be understood that if the optimal target length is too small, it lacks practical application value and cannot play the protective role and auxiliary sound transmission role of the microphone probe for microphone testing. Therefore, it is necessary to limit the minimum value of the target length range. In this embodiment, the preset minimum value is used as the minimum value of the target length range, and the preset minimum value can be determined by those skilled in the art according to prior values and actual situations.

[0076] For example, the preset minimum value is 1 mm or 2 mm.

[0077] Preferably, in step S103, the method for calculating the sound transmission efficiency of each simulation model includes steps S1031 to S1033.

[0078] Step S1031: Calculate the side slit sound transmission efficiency of each simulation model based on the width of the slit, the radius of the microphone probe, and the target length corresponding to each simulation model.

[0079] Step S1032: Determine the sound wave attenuation factor and the sound wave phase delay of each simulation model based on the radius of the microphone probe and the target length corresponding to each simulation model.

[0080] Step S1033: Determine the transfer function of each simulation model based on the side slit sound transmission efficiency, the sound wave attenuation factor, and the sound wave phase delay, and calculate the sound transmission efficiency of each simulation model.

[0081] It can be understood that step S103 is implemented by parametric scanning of the simulation model.

[0082] The simulation software is any one of COMSOL, ANSYS, and SolidWorks Simulation. Those skilled in the art can select according to the actual situation, or other software with similar functions can also be used for simulation.

[0083] Preferably, in step S1031, calculating the side slit sound transmission efficiency of each simulation model based on the width of the slit, the radius of the microphone probe, and the target length corresponding to each simulation model includes steps S10311 to S10313.

[0084] Step S10311: Calculate the slit area of each simulation model based on the width of the slit and the target length corresponding to each simulation model.

[0085] For example, in the case where the slit is a linear slit, the width of the slit is multiplied by the target length to obtain the corresponding slit area.

[0086] Step S10312: Calculate the cross-sectional area of the microphone probe based on the radius of the microphone probe.

[0087] For example, in the case where the microphone probe is a cylinder, the cross-sectional area of the microphone probe is equal to the area of a circle with the radius of the microphone probe.

[0088] In the case where the microphone probe is a semi-cylinder, the cross-sectional area of the microphone probe is equal to the area of a semi-circle with the radius of the microphone probe.

[0089] Step S10313: Determine the lateral slit sound transmission efficiency of each simulation model based on the ratio of the slit area to the cross-sectional area of each simulation model : ; Wherein, represents the slit area, represents the cross-sectional area.

[0090] Preferably, in step S1032, based on the radius of the microphone probe and the target length corresponding to each simulation model, determine the acoustic attenuation factor and the acoustic phase delay of each simulation model, including steps S10321 to S10322.

[0091] Step S10321: Based on the radius a of the microphone probe and the target length x corresponding to each simulation model, determine the acoustic attenuation factor of each simulation model , ; Wherein, represents the natural constant, represents the acoustic angular frequency, represents the air viscosity, represents the air density.

[0092] It can be understood that as the target length x increases, the attenuation loss of the sound wave transmitted in the microphone probe due to thermo-viscous effects becomes greater, and the value of the acoustic attenuation factor decreases.

[0093] Step S10322: Based on the target length x corresponding to each simulation model, determine the acoustic phase delay of each simulation model ; Wherein, represents the imaginary unit, represents the wave number.

[0094] It can be understood that as the target length x increases, the delay loss due to the phase delay becomes greater as the sound wave travels along the microphone probe towards the microphone, and the value of the acoustic phase delay decreases.

[0095] Preferably, in step S1033, based on the lateral slit sound transmission efficiency, the acoustic attenuation factor, and the acoustic phase delay, determine the transfer function of each simulation model and calculate the sound transmission efficiency of each simulation model, including steps S10331 to S10332.

[0096] Step S10331: Calculate the transfer function of each simulation model according to the following formula : ; It can be understood that as the target length x increases, The value increases, and the value decreases.

[0097] Step S10332, based on the numerical calculation algorithm and the transfer functions of the respective simulation models , calculate the sound transmission efficiency of each simulation model.

[0098] The above numerical calculation algorithms include, but are not limited to, numerical integration method, overlap save method, algorithms based on fast Fourier transform (FFT) and frequency domain integration.

[0099] Calculating the sound transmission efficiency of each simulation model based on the above numerical calculation algorithm and transfer function belongs to the prior art, and will not be elaborated herein in this embodiment.

[0100] Preferably, after obtaining the optimal probe length, the method for determining the size of the above microphone probe further includes steps S1041 to S1042.

[0101] Step S1041, determine the size of the target slit based on the width of the slit and the optimal probe length.

[0102] It can be understood that the length of the target slit is equal to the optimal probe length.

[0103] Step S1042, determine the number of target slits based on the strength requirement of the microphone probe.

[0104] It can be understood that the size of the microphone probe includes the size and number of the target slits.

[0105] In order to further improve the side-slit sound transmission efficiency of the microphone probe, multiple target slits can be opened on the microphone probe. Taking the number of target slits as N as an example, at this time the side-slit sound transmission efficiency .

[0106] Considering that the microphone probe needs to have the necessary structural strength, N cannot be too large. For example, N is 2 or 3.

[0107] The N target slits are preferably opened on the microphone probe at uniform intervals, and can have relatively high stability.

[0108] In addition, the material of the microphone probe is any one of aluminum alloy, stainless steel, and engineering plastic, and those skilled in the art can also select other materials that can provide the necessary structural strength according to actual needs.

[0109] Obviously, from the perspective of further reducing the cost of mass production, the material of the microphone probe is preferably engineering plastic.

[0110] Exemplarily, this embodiment also provides an experimental verification of the optimal probe length, which is as follows: A quarter microphone with a diameter of 1 / 4 Inch = 6.35 mm is selected. The length of the slit on the microphone probe is 1 mm. One end of the slit is close to the connection between the microphone probe and the recording component of the microphone. The influence of microphone probes with lengths ranging from 5 mm to 50 mm on the recording signal obtained by the microphone is tested. For the test results, please refer to Figure 2 as shown. Among them, the opening indicates the position where the slit is located.

[0111] It can be seen that when the sound transmission efficiency of the side slit remains unchanged, the difference between the sound pressure level of the sound wave received at the microphone and the sound pressure level of the sound wave at the opening increases with the increase of the length of the microphone probe, indicating that the greater the length of the microphone probe, the lower the sound transmission efficiency.

[0112] A quarter microphone with a diameter of 6.35 mm is selected. The length of the microphone probe is 40 mm. The length of the slit on the microphone probe is 1 mm. The influence of the opening positions of the slit located 1 mm - 39 mm away from the end of the microphone probe on the recording signal obtained by the microphone is tested. For the test results, please refer to Figure 3 as shown. Among them, the end of the microphone probe is the end of the microphone probe far from the microphone.

[0113] It can be seen that when the sound wave attenuation factor and the sound wave phase delay remain unchanged, the difference between the sound pressure level of the sound wave received at the microphone and the sound pressure level of the sound wave at the opening decreases with the increase of the distance between the opening position of the slit and the end of the microphone probe, indicating that the farther the slit is from the end of the microphone probe, that is, the closer the slit is to the microphone, the higher the sound transmission efficiency.

[0114] A quarter microphone with a diameter of 6.35 mm is selected. The length of the microphone probe is 50 mm. One end of the slit is close to the connection between the microphone probe and the recording component of the microphone. The influence of slits with lengths ranging from 1 mm to 45 mm on the recording signal obtained by the microphone is tested. For the test results, please refer to Figure 4 as shown.

[0115] It can be seen that when the length of the microphone probe remains unchanged, the difference between the sound pressure level of the sound wave received at the microphone and the sound pressure level of the sound wave at the opening decreases with the increase of the length of the slit, indicating that the longer the slit, the higher the sound transmission efficiency.

[0116] Based on the above verification results, for the method for determining the size of the microphone probe provided in this embodiment, the lengths of the gaps of each simulation model are set to be equal to the corresponding target lengths. On the one hand, the influence of the different distances between the gaps and the microphone on the microphone obtaining the recording signal can be ignored. On the other hand, the side-gap sound transmission efficiency related to the gap length and the probe internal loss related to the target length of the microphone probe can be characterized by this one variable of the target length, reducing the calculation difficulty of the sound transmission efficiency while improving the accuracy of the obtained sound transmission efficiency.

[0117] Further, a quarter microphone with a diameter of 6.35 mm is selected. Based on the above method, the target length range of the microphone probe is set to 1 mm - 12.7 mm, and in this test, the above target length range is expanded to 1 mm - 15 mm to improve the accuracy. Five target lengths are selected from the above target length range: 1 mm, 5 mm, 6 mm, 10 mm, 15 mm, and the gap length is equal to the corresponding target length. The influence of the microphone probes with the above 5 target lengths on the microphone obtaining the recording signal is tested. For the test results, please refer to Figure 5 and Figure 6 as shown. Among them, Figure 5 the sound wave frequency used in Figure 6 is 1000 - 2000 Hz, and

[0118] Combined with Figure 5 and Figure 6 it can be seen that when the target length of the microphone probe is 6 mm or 10 mm, the sound transmission efficiency is relatively high at the sound wave frequencies of 1000 - 2000 Hz and 5000 - 6000 Hz. Therefore, based on the above 5 target lengths, the optimal probe length of the quarter microphone is determined to be 6 mm or 10 mm.

[0119] Further, the sound pressure amplitudes of the sound waves obtained by the microphone in three cases: without a microphone probe, with a microphone probe length of 6 mm, and with a microphone probe length of 10 mm are tested. For the test results, please refer to Figure 7 and Figure 8 as shown. Among them, Figure 7 is the simulation test result of the corresponding model in the simulation software, Figure 8 and

[0120] Combined with Figure 7 and Figure 8It can be known that when the sound wave frequency does not exceed 3000 Hz, there is no obvious difference in the sound pressure amplitude of the sound waves obtained by the microphone in the above three cases. When the sound wave frequency exceeds 3000 Hz, as the sound wave frequency increases, in Figure 7 the simulation results, compared with the case where the microphone probe length is 10 mm, the sound pressure amplitude of the sound waves obtained by the microphone when the microphone probe length is 6 mm is closer to the sound pressure amplitude of the sound waves obtained by the microphone without a microphone probe; in Figure 8 the measured results, there is no obvious difference between the case where the microphone probe length is 6 mm and the case where the microphone probe length is 10 mm. Therefore, the optimal probe length of the quarter microphone is determined to be 6 mm.

[0121] It can be understood that those skilled in the art can choose either 6 mm or 10 mm as the optimal probe length of the quarter microphone. The above test result of determining the optimal probe length of the quarter microphone to be 6 mm is only a preferred example.

[0122] In addition, a half microphone with a diameter of 12.7 mm is selected to test the influence of microphone probes with target lengths of 12 mm, 13 mm, and 14 mm on the recording signal obtained by the microphone. For the test results, please refer to Figure 9 as shown, and the optimal probe length of the half microphone is determined to be 13 mm.

[0123] An eighth microphone with a diameter of 3.175 mm is selected to test the influence of microphone probes with target lengths of 1 mm, 3 mm, 5 mm, and 7 mm on the recording signal obtained by the microphone. For the test results, please refer to Figure 10 as shown, and the optimal probe length of the eighth microphone is determined to be 1 mm.

[0124] It can be understood that considering that the optimal probe length of the microphone probe is positively correlated with the diameter of the microphone, based on the test result that the optimal probe length of the quarter microphone is 6 mm, the target length in the case of selecting a half microphone is preferably greater than 6 mm, which is set to be greater than 10 mm in this test; the target length in the case of selecting an eighth microphone is preferably less than 6 mm, and in this test, the test case with a target length of 7 mm is added for comparison.

[0125] The embodiment of the present invention also provides a non-transitory machine-readable medium storing a computer program, wherein the above computer program, when executed by a processor of a computer, is used to cause the computer to execute the size determination method of the embodiment of the present invention.

[0126] An embodiment of the present invention further provides a computer program product, including a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the size determination method of the embodiment of the present invention.

[0127] An embodiment of the present invention further provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor. The memory stores a computer program capable of being executed by the at least one processor, and the computer program, when executed by the at least one processor, is used to cause the electronic device to execute the size determination method of the embodiment of the present invention.

[0128] Reference Figure 11 , the structural block diagram of an electronic device that can be a server or a client of an embodiment of the present invention will now be described. It is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device is intended to represent various forms of digital electronic computer devices, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processors, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0129] As Figure 11 shown, the electronic device includes a computing unit 1101, which can execute various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 1102 or a computer program loaded from a storage unit 1108 into a random access memory (RAM) 1103. In the RAM 1103, various programs and data required for the operation of the electronic device can also be stored. The computing unit 1101, the ROM 1102, and the RAM 1103 are connected to each other through a bus 1104. An input / output (I / O) interface 1105 is also connected to the bus 1104.

[0130] Multiple components in the electronic device are connected to the I / O interface 1105, including: an input unit 1106, an output unit 1107, a storage unit 1108, and a communication unit 1109. The input unit 1106 can be any type of device capable of inputting information to the electronic device. The input unit 1106 can receive input digital or character information and generate key signal inputs related to the user settings and / or function controls of the electronic device. The output unit 1107 can be any type of device capable of presenting information and can include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 1108 can include, but is not limited to, a magnetic disk and an optical disk. The communication unit 1109 allows the electronic device to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks and can include, but is not limited to, a modem, a network card, an infrared communication device, and / or a wireless communication transceiver, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0131] The computing unit 1101 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 1101 include, but are not limited to, a CPU, a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing units, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 1101 executes the various methods and processes described above. For example, in some embodiments, the method embodiments of the present invention can be implemented as a computer program tangibly contained in a machine-readable medium, such as the storage unit 1108. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device via the ROM 1102 and / or the communication unit 1109. In some embodiments, the computing unit 1101 can be configured to execute the above-described dimension determination method in any other suitable manner (e.g., by means of firmware).

[0132] The computer program for implementing the dimension determination method of the embodiments of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to the processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing devices, such that when the computer programs are executed by the processor or controller, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer programs can be executed entirely on the machine, partially on the machine, executed partially on the machine as an independent software package and partially on a remote machine, or executed entirely on a remote machine or server.

[0133] In the context of embodiments of the present inventive concept, a machine-readable medium may be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable signal medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, or infrared system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0134] Embodiments of the present inventive concept also provide a method for manufacturing a microphone probe, including:

[0135] Determining the size of the microphone probe according to any of the foregoing size determination methods.

[0136] Manufacturing the microphone probe based on the size of the microphone probe.

[0137] It can be understood that the above-mentioned manufactured microphone probe is detachable and has high flexibility and environmental adaptability.

[0138] Preferably, the above manufacturing method further includes:

[0139] Mounting the physical microphone probe manufactured on the corresponding microphone and measuring the actual sound transmission efficiency of the above microphone during recording.

[0140] In the case where the actual sound transmission efficiency is less than a preset threshold, re-determining the target length range in the above size determination method, or adjusting the number of target lengths in the above size determination method to obtain a new optimal probe length.

[0141] Based on the new optimal probe length, the gap width and the microphone probe radius in the above size determination method, manufacturing a new microphone probe.

[0142] The microphone probe manufactured by the method provided in this embodiment can avoid large-particle samples to be measured from blocking the microphone. It has high sound transmission efficiency, can improve the accuracy of the microphone for acoustic testing of samples to be measured. It has a simple and flexible structure, can significantly reduce the cost of large-scale production, and improve the testing efficiency of the microphone.

[0143] It should be noted that the term "including" and its variants used in the embodiments of the present invention are open-ended, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more". The descriptions of terms such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0144] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the embodiments of the present invention are all information and data that have been authorized by the user or fully authorized by all parties. And the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions, and corresponding operation entrances are provided for users to choose to authorize or refuse.

[0145] In the method embodiments provided by the embodiments of the present invention, the steps recorded can be executed in different orders and / or executed in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The protection scope of the present invention is not limited in this regard.

[0146] The term "embodiment" in this specification means that the specific features, structures, or characteristics described in combination with the embodiment may be included in at least one embodiment of the present invention. The phrase appears in various positions in the specification does not necessarily mean the same embodiment, nor does it mean being independent or alternative to other embodiments and mutually exclusive. The various embodiments in this specification are all described in a related manner, and the same or similar parts among the various embodiments are referred to each other. In particular, for device, equipment, and system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiments.

[0147] The above-described embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation of the protection scope. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A method for determining the size of a microphone probe, characterized in that Including: Determine the width of the gap of the microphone probe according to the size of the sample to be measured. The gap is opened on the side of the microphone probe, and the microphone probe is connected to the recording component of the microphone, and the microphone is used for acoustic testing of the sample to be measured; Determine the radius of the microphone probe and the target length range of the microphone probe according to the diameter of the microphone; Based on the width of the gap, the radius of the microphone probe, and the target length range, construct multiple simulation models of the microphone probe corresponding to different target lengths, calculate the sound transmission efficiency of each simulation model, and obtain the optimal probe length. The target length is the length in the target length range, and the length of the gap of each simulation model is equal to the corresponding target length; the size of the microphone probe includes the width of the gap, the radius of the microphone probe, and the optimal probe length.

2. The method according to claim 1, wherein The method for calculating the sound transmission efficiency of each simulation model includes: Based on the width of the gap, the radius of the microphone probe, and the target length corresponding to each simulation model, calculate the side-gap sound transmission efficiency of each simulation model; Based on the radius of the microphone probe and the target length corresponding to each simulation model, determine the sound wave attenuation factor and the sound wave phase delay of each simulation model; Based on the side-gap sound transmission efficiency, the sound wave attenuation factor, and the sound wave phase delay, determine the transfer function of each simulation model, and calculate the sound transmission efficiency of each simulation model.

3. The method according to claim 2, wherein Based on the width of the gap, the radius of the microphone probe, and the target length corresponding to each simulation model, calculating the side-gap sound transmission efficiency of each simulation model includes: Based on the width of the gap and the target length corresponding to each simulation model, calculate the gap area of each simulation model; Calculate the cross-sectional area of the microphone probe based on the radius of the microphone probe; Based on the ratio of the gap area to the cross-sectional area of each simulation model, determine the side-gap sound transmission efficiency of each simulation model.

4. The method according to claim 2, wherein Based on the radius of the microphone probe and the target length corresponding to each simulation model, determining the sound wave attenuation factor and the sound wave phase delay of each simulation model includes: Determine the acoustic attenuation factor of each of the simulation models based on the radius a of the microphone probe and the target length x corresponding to each of the simulation models , wherein, represents the natural constant, represents the acoustic angular frequency, represents the air viscosity, represents the air density; Determine the acoustic wave phase delay of each of the simulation models based on the target length x corresponding to each of the simulation models ; where represents the imaginary unit represents the wave number 5. The method according to claim 2, characterized in that, Based on the side-gap sound transmission efficiency, the sound wave attenuation factor, and the sound wave phase delay, determining the transfer function of each simulation model, and calculating the sound transmission efficiency of each simulation model includes: Calculate the transfer function of each of the simulation models according to the following formula : ； Among them, represents the side-seam sound transmission efficiency corresponding to each of the simulation models, represents the sound wave attenuation factor corresponding to each of the simulation models, represents the sound wave phase delay corresponding to each of the simulation models; Based on numerical calculation algorithms and the transfer functions of each of the simulation models , calculate the sound transmission efficiency of each of the simulation models.

6. The method according to claim 1, wherein According to the diameter of the microphone, determining the radius of the microphone probe and the target length range of the microphone probe includes: Determine the radius of the microphone probe according to 0.4 - 0.45 times the diameter of the microphone; Determine the maximum value of the target length range according to 2 times the diameter of the microphone; Based on the preset minimum value and the maximum value, determine the target length range.

7. The method according to claim 1, characterized in that, After obtaining the optimal probe length, the method further includes: Based on the width of the gap and the optimal probe length, determine the size of the target gap; Based on the strength requirement of the microphone probe, determine the number of the target gaps. Wherein, the size of the microphone probe includes the size and quantity of the target slit.

8. A non-transitory machine-readable medium storing computer instructions, characterized in that, The computer instructions are for causing the computer to execute the method according to any one of claims 1 to 7.

9. An electronic device, comprising: A processor, and a memory storing a program, wherein the program includes instructions which, when executed by the processor, cause the processor to execute the method according to any one of claims 1 to 7.

10. A manufacturing method of a microphone probe, characterized in that, Comprising: Determining the size of the microphone probe according to the method according to any one of claims 1 to 7; Manufacturing the microphone probe based on the size of the microphone probe.

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