Loudspeaker parameter determination method and system

Abstract

The invention discloses a method and a system for determining parameters of a loudspeaker. The parameter determination method of the loudspeaker comprises the following steps: acquiring an impedance curve of the loudspeaker under different position offsets; wherein the position offset is the distance between the circle center of the voice coil and the circle center of the magnetic circuit of the loudspeaker, and the impedance curve is a change curve of the impedance of the loudspeaker along with the frequency; respectively fitting the impedance curves of the loudspeaker under the different position offsets to obtain a calculation formula of the impedance corresponding to the different position offsets relative to the frequency; wherein the calculation formula of the impedance about the frequency at least comprises first equivalent inductance; and constructing a change curve of the first equivalent inductance along with the position offset according to a calculation formula of the impedance corresponding to different position offsets relative to the frequency. According to the invention, the accuracy of describing the inductance characteristic of the loudspeaker can be improved, and the product design period of the loudspeaker can be shortened.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of loudspeaker technology, and particularly relate to a parameter determination method and system for a loudspeaker. BACKGROUND

[0002] The inductance parameter of a loudspeaker is a key factor affecting its electrical and acoustic performance, and is crucial in impedance characteristics, frequency response and distortion analysis.

[0003] However, the inductance of the magnetic circuit of a loudspeaker is related to frequency, and in the prior art, the inductance of a loudspeaker can only be measured at a certain frequency. At different frequencies, the inductance of the loudspeaker is different, and the trend of the inductance curve of the loudspeaker at different frequencies is also different, so the inductance characteristics of the loudspeaker cannot be accurately described. SUMMARY

[0004] The present application provides a parameter determination method and system for a loudspeaker to improve the accuracy of describing the inductance characteristics of the loudspeaker and shorten the product design cycle of the loudspeaker.

[0005] In a first aspect, embodiments of the present application provide a parameter determination method for a loudspeaker, the loudspeaker comprising a loudspeaker magnetic circuit and a voice coil, the voice coil being located inside the loudspeaker magnetic circuit, the parameter determination method for the loudspeaker comprising:

[0006] obtaining impedance curves of the loudspeaker at different position offsets; wherein the position offset is the distance between the center of the voice coil and the center of the loudspeaker magnetic circuit, and the impedance curve is the curve of the impedance of the loudspeaker varying with frequency;

[0007] fitting the impedance curves of the loudspeaker at different position offsets respectively to obtain impedance calculation formulas about frequency corresponding to different position offsets; wherein the impedance calculation formula about frequency includes at least a first equivalent inductance, and the first equivalent inductance is the inductance of the loudspeaker in a first frequency range;

[0008] constructing a curve of the first equivalent inductance varying with the position offset according to the impedance calculation formulas about frequency corresponding to different position offsets.

[0009] Optionally, obtaining the impedance curves of the loudspeaker at different position offsets comprises:

[0010] controlling the center of the voice coil to move relative to the center of the loudspeaker magnetic circuit;

[0011] obtaining the impedance curves of the loudspeaker at different position offsets.

[0012] Optionally, before the impedance curve of the loudspeaker under different position offsets is obtained, the method further comprises:

[0013] obtaining a three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and the voice coil;

[0014] establishing a finite element model in finite element simulation software according to the three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and the voice coil to simulate the loudspeaker.

[0015] Optionally, the impedance curve of the loudspeaker under different position offsets is fitted respectively to obtain a calculation formula of the impedance about frequency corresponding to different position offsets, comprising:

[0016] the impedance curve of the loudspeaker under different position offsets is fitted respectively to obtain a calculation formula of the impedance about frequency corresponding to different position offsets;

[0017] The calculation formula of the impedance of the loudspeaker about frequency satisfies:

[0018]

[0019] wherein, Z e is the impedance of the loudspeaker, Z e (f) represents the impedance of the loudspeaker varying with frequency, f is the frequency of the loudspeaker, R e is a first equivalent resistance, the first equivalent resistance R e is the resistance of the loudspeaker at a first preset frequency, ω is an angular frequency, ω=2πf, j is an imaginary unit, L e is a first equivalent inductance, R2 is a second equivalent resistance, the second equivalent resistance R2 is the resistance of the loudspeaker at a second preset frequency, L2 is a second equivalent inductance, the second equivalent inductance L2 is the inductance of the loudspeaker in a second frequency range, and the inductance parameters include the first equivalent inductance L e , the second equivalent resistance R2 and the second equivalent inductance L2; in the calculation formula of the impedance about frequency corresponding to the same position offset, the first equivalent resistance R e , the first equivalent inductance L e , the second equivalent resistance R2 and the second equivalent inductance L2 are constants.

[0020] Optionally, a curve of the first equivalent inductance varying with the position offset is constructed according to the calculation formula of the impedance about frequency corresponding to different position offsets, comprising:

[0021] extracting the first equivalent inductance L in the calculation formula of the impedance corresponding to different position offsets with respect to frequency e ;

[0022] extracting the first equivalent inductance L in the calculation formula of the impedance corresponding to different position offsets with respect to frequency e , constructing the first equivalent inductance L e with the position offset.

[0023] Optionally, the impedance curves of the loudspeaker under different position offsets are fitted respectively, including:

[0024] The impedance curves of the loudspeaker under different position offsets are fitted respectively using the least square method.

[0025] Optionally, when the first equivalent inductance is constructed according to the change curve of the first equivalent inductance with the position offset according to the calculation formula of the impedance corresponding to different position offsets with respect to frequency, the method further includes:

[0026] extracting the second equivalent resistance R2 and the second equivalent inductance L2 in the calculation formula of the impedance corresponding to different position offsets with respect to frequency;

[0027] constructing the change curve of the second equivalent resistance R2 with the position offset according to the second equivalent resistance R2 under different position offsets;

[0028] constructing the change curve of the second equivalent inductance L2 with the position offset according to the second equivalent inductance L2 under different position offsets.

[0029] In a second aspect, the embodiments of the present application also provide a parameter determination system of a loudspeaker, which is used to execute the parameter determination method of the loudspeaker in any embodiment of the present application, and the parameter determination system of the loudspeaker includes:

[0030] The acquisition module is used to acquire impedance curves of the loudspeaker under different position offsets; wherein the position offset is the distance between the center of the voice coil and the center of the magnetic circuit of the loudspeaker, and the impedance curve is the change curve of the impedance of the loudspeaker with respect to frequency;

[0031] The fitting module is used to fit the impedance curves of the loudspeaker under different position offsets respectively, to obtain calculation formulas of the impedance corresponding to different position offsets with respect to frequency; wherein the calculation formula of the impedance with respect to frequency at least includes a first equivalent inductance, and the first equivalent inductance is the inductance of the loudspeaker in a first frequency range.

[0032] A curve construction module is configured to construct a curve of the first equivalent inductance varying with the position offset according to the calculation formula of the impedance about the frequency corresponding to different position offsets.

[0033] Optionally, the parameter determination system of the loudspeaker further comprises:

[0034] An emulation module is configured to acquire a three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and the voice coil, and establish a finite element model according to the three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and the voice coil to emulate the loudspeaker; wherein the emulation module comprises a finite element emulation software.

[0035] Optionally, the acquisition module comprises:

[0036] A control unit is configured to control the center of the voice coil to move relative to the center of the loudspeaker magnetic circuit.

[0037] An acquisition unit is configured to acquire an impedance curve of the loudspeaker under different position offsets.

[0038] The present application provides a parameter determination method and system of a loudspeaker, the parameter determination method of the loudspeaker acquires an impedance curve of the loudspeaker under different position offsets, the position offset is the distance between the center of the voice coil and the center of the loudspeaker magnetic circuit, and the impedance curve is a curve of the impedance of the loudspeaker varying with the frequency, which can reflect the variation of the impedance of the loudspeaker with the frequency, the impedance curves of the loudspeaker under different position offsets are fitted respectively, a calculation formula of the impedance about the frequency corresponding to different position offsets can be obtained, the calculation formula of the impedance about the frequency can describe the impedance characteristics of the loudspeaker, the calculation formula of the impedance about the frequency includes a first equivalent inductance, a curve of the first equivalent inductance varying with the position offset can be constructed according to the calculation formula of the impedance about the frequency corresponding to different position offsets, the first equivalent inductance is related to the position offset and does not vary with the frequency of the loudspeaker, which can more accurately reflect the inductance characteristics of the loudspeaker, thereby shortening the product design cycle of the trial production, testing and improvement process of the loudspeaker. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A flowchart of a parameter determination method of a loudspeaker is provided for the embodiments of the present application.

[0040] Figure 2 A structural schematic diagram of a loudspeaker is provided for the embodiments of the present application.

[0041] Figure 3 A schematic diagram of an impedance curve of a loudspeaker under different position offsets is provided for the embodiments of the present application.

[0042] Figure 4 A flowchart of another method for determining the parameters of a loudspeaker provided in an embodiment of the present invention;

[0043] Figure 5 A graph showing the variation of the first equivalent inductance with position offset provided in an embodiment of the present invention;

[0044] Figure 6 The graphs showing the inductance of the loudspeaker at different frequencies are provided for embodiments of the present invention.

[0045] Figure 7 This is a graph showing the variation of the second equivalent resistance with position offset provided in an embodiment of the present invention.

[0046] Figure 8 This is a graph showing the variation of the second equivalent inductance with position offset provided in an embodiment of the present invention.

[0047] Figure 9 This is a schematic diagram of the speaker parameter determination system in an embodiment of the present invention;

[0048] Figure 10 This is a schematic diagram of another speaker parameter determination system according to an embodiment of the present invention. Detailed Implementation

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0050] This invention provides a method for determining the parameters of a loudspeaker. This embodiment is applicable to loudspeaker simulation analysis. By constructing a curve showing the change of a first equivalent inductance with position offset, the inductive characteristics of the loudspeaker can be reflected more accurately, thereby shortening the product design cycle for loudspeakers. This method can be executed by a loudspeaker parameter determination system, which can be implemented in hardware and / or software. Figure 1 This is a flowchart illustrating a method for determining the parameters of a loudspeaker according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a loudspeaker provided in an embodiment of the present invention, such as... Figure 2 As shown, the loudspeaker 100 includes a loudspeaker magnetic circuit 110 and a voice coil 120, with the voice coil 120 located inside the loudspeaker magnetic circuit 110, as... Figure 1 As shown, the method for determining the parameters of a loudspeaker includes:

[0051] S110, obtain an impedance curve of the loudspeaker under different position offsets; wherein, the position offset is a distance between a center of the voice coil and a center of a magnetic circuit of the loudspeaker, and the impedance curve is a curve of impedance of the loudspeaker varying with frequency.

[0052] As shown in Figure 2 , the loudspeaker magnetic circuit 110 can be composed of a T-shaped magnet and a magnet, and there is a gap between the T-shaped magnet and the magnet, the voice coil 120 can be located in the gap between the T-shaped magnet and the magnet of the loudspeaker magnetic circuit 110 and does not contact the loudspeaker magnetic circuit 110, and the position of the voice coil 120 in the gap can be adjusted to have different position offsets.

[0053] Specifically, to obtain the impedance curve of the loudspeaker under different position offsets, the loudspeaker 100 can be simulated in simulation software, and the impedance curve of the loudspeaker 100 under different position offsets can be obtained by adjusting the distance between the center of the voice coil 120 and the center of the loudspeaker magnetic circuit 110 in the simulation software; or the distance between the center of the voice coil 120 and the center of the loudspeaker magnetic circuit 110 can be directly adjusted by experiment, and the impedance curve of the loudspeaker 100 under different position offsets can be obtained by testing. The position offset is the distance between the center of the voice coil 120 and the center of the loudspeaker magnetic circuit 110, and the center of the voice coil 120 can be offset relative to the center of the loudspeaker magnetic circuit 110 in a first direction, and the position offset is positive, and the center of the voice coil 120 can be offset relative to the center of the loudspeaker magnetic circuit 110 in a second direction, and the position offset is negative, and the first direction and the second direction are opposite directions, for example, the first direction is up and the second direction is down. The impedance curve is a curve of impedance of the loudspeaker 100 varying with frequency, Figure 3 A schematic diagram of the impedance curve of the loudspeaker under different position offsets provided by the embodiment of the present application is shown in Figure 3 , under the same position offset, the impedance of the loudspeaker 100 is different at different frequencies; under different position offsets x, the impedance Z e of the loudspeaker 100 in the frequency range of 100-1000Hz will also be different, for example, the position offset x can be -4, -3, -2, -1, 0, 1, 2, 3, 4mm, and the impedance curve Ze(f) of the loudspeaker 100 under different position offsets x can be obtained to obtain a calculation formula of the impedance of the loudspeaker 100 with respect to frequency.

[0054] S120, respectively fit the impedance curves of the loudspeaker under different position offsets to obtain a calculation formula of the impedance with respect to frequency corresponding to different position offsets; wherein, the calculation formula of the impedance with respect to frequency at least includes a first equivalent inductance, and the first equivalent inductance is an inductance of the loudspeaker in a first frequency range.

[0055] Specifically, the impedance curves of the loudspeaker 100 under different position offsets are fitted respectively to obtain the impedance calculation formula about frequency corresponding to different position offsets, for example, the impedance curves of the loudspeaker 100 under different position offsets can be fitted respectively by using the least square method or other fitting methods to obtain the impedance calculation formula about frequency corresponding to different position offsets, the impedance calculation formula about frequency at least includes the first equivalent inductance, the first equivalent inductance can be a coefficient in the impedance calculation formula about frequency, and in the same impedance calculation formula about frequency, the first equivalent inductance is a constant, the first equivalent inductance can be used as the inductance of the loudspeaker 100 in the first frequency range, and the first equivalent inductance can reflect the inductance characteristics of the loudspeaker 100 under the corresponding position offset.

[0056] In S130, a first equivalent inductance change curve with position offset is constructed according to the impedance calculation formula about frequency corresponding to different position offsets.

[0057] Specifically, to describe the inductance characteristics of the loudspeaker 100 under different position offsets, the first equivalent inductance change curve with position offset can be constructed according to the first equivalent inductance in the impedance calculation formula about frequency corresponding to different position offsets, the first equivalent inductance in the first equivalent inductance change curve with position offset is related to the position offset and does not change with the frequency of the loudspeaker 100, which can more accurately reflect the inductance characteristics of the loudspeaker 100, thereby shortening the product design cycle of the trial production, testing and improvement process of the loudspeaker 100.

[0058] The loudspeaker parameter determination method provided by the embodiment of the present application can obtain the impedance curves of the loudspeaker under different position offsets, the position offset is the distance between the center of the voice coil and the center of the magnetic circuit of the loudspeaker, and the impedance curve is the change curve of the impedance of the loudspeaker with frequency, which can reflect the change of the impedance of the loudspeaker with frequency, the impedance calculation formula about frequency corresponding to different position offsets can be obtained by fitting the impedance curves of the loudspeaker under different position offsets respectively, the impedance calculation formula about frequency can describe the impedance characteristics of the loudspeaker, the first equivalent inductance is included in the impedance calculation formula about frequency, the first equivalent inductance change curve with position offset can be constructed according to the impedance calculation formula about frequency corresponding to different position offsets, the first equivalent inductance is related to the position offset and does not change with the frequency of the loudspeaker, which can more accurately reflect the inductance characteristics of the loudspeaker, thereby shortening the product design cycle of the trial production, testing and improvement process of the loudspeaker.

[0059] To further accurately reflect the inductance characteristics of the loudspeaker, the embodiment of the present application further provides another loudspeaker parameter determination method, Figure 4A flowchart of another parameter determination method of a loudspeaker provided by an embodiment of the present application is shown in Figure 4 The parameter determination method of the loudspeaker comprises:

[0060] S210, obtain the three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and voice coil; in a finite element simulation software, establish a finite element model according to the three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and voice coil, to simulate the loudspeaker.

[0061] Specifically, the three-dimensional model of the loudspeaker magnetic circuit and voice coil can be drawn by a three-dimensional drawing software, and the three-dimensional model of the loudspeaker magnetic circuit and voice coil is input into the finite element simulation software. In the finite element simulation software, the material parameters and voice coil design parameters of the loudspeaker magnetic circuit and voice coil can be defined, so as to establish a finite element model. In addition, the load and boundary of the loudspeaker magnetic circuit and voice coil in the finite element model can be defined to improve the accuracy of the finite element model.

[0062] S220, control the center of the voice coil to move relative to the center of the loudspeaker magnetic circuit; obtain the impedance curve of the loudspeaker under different position offsets.

[0063] Specifically, referring to Figure 2 , by controlling the center of the voice coil 120 to move relative to the center of the loudspeaker magnetic circuit 110, the distance between the center of the voice coil 120 and the center of the loudspeaker magnetic circuit 110 is a preset distance, which constitutes different position offsets x, for example, the position offset x can be -4, -3, -2, -1, 0, 1, 2, 3, 4 mm. Under different position offsets x, the impedance curve of the loudspeaker 100 is obtained respectively, so that the impedance curve of the loudspeaker 100 under different position offsets can be obtained. By obtaining the impedance curve Ze(f) of the loudspeaker 100 under different position offsets x, the calculation formula of the impedance about frequency under different position offsets can be obtained.

[0064] S230, respectively fit the impedance curves of the loudspeaker under different position offsets to obtain the calculation formula of the impedance about frequency corresponding to different position offsets; wherein the calculation formula of the impedance about frequency at least includes a first equivalent inductance, and the first equivalent inductance is the inductance of the loudspeaker in a first frequency range.

[0065] S240, construct a curve of the first equivalent inductance changing with the position offset according to the calculation formula of the impedance about frequency corresponding to different position offsets.

[0066] In some embodiments of the present application, the impedance curves of the loudspeaker under different position offsets are respectively fitted to obtain the calculation formula of the impedance about frequency corresponding to different position offsets, which comprises:

[0067] The impedance curves of the loudspeaker under different position offsets are fitted respectively to obtain the impedance calculation formula about frequency corresponding to different position offsets; the impedance calculation formula about frequency of the loudspeaker satisfies:

[0068]

[0069] Wherein, Z e is the impedance of the loudspeaker, Z e (f) represents the impedance of the loudspeaker varying with frequency, f is the frequency of the loudspeaker, R e is the first equivalent resistance, the first equivalent resistance R e is the resistance of the loudspeaker at the first preset frequency, ω is the angular frequency, ω = 2πf, j is the imaginary unit, L e is the first equivalent inductance, the first equivalent inductance L e is the inductance of the loudspeaker in the first frequency range, R2 is the second equivalent resistance, the second equivalent resistance R2 is the resistance of the loudspeaker at the second preset frequency, L2 is the second equivalent inductance, the second equivalent inductance L2 is the inductance of the loudspeaker in the second frequency range, and the inductance parameters include the first equivalent inductance L e , the second equivalent resistance R2 and the second equivalent inductance L2; in the impedance calculation formula about frequency corresponding to the same position offset, the first equivalent resistance R e , the first equivalent inductance L e , the second equivalent resistance R2 and the second equivalent inductance L2 are constants.

[0070] Specifically, the impedance curves of the loudspeaker under different position offsets are fitted respectively to obtain the impedance calculation formula about frequency corresponding to different position offsets, and each position offset has a corresponding impedance calculation formula about frequency. In the impedance calculation formula about frequency, the first equivalent resistance R e , the first equivalent inductance L e , the second equivalent resistance R2 and the second equivalent inductance L2 are constants, and the impedance Z e of the loudspeaker varies with the frequency f. The minimum value in the first frequency range is greater than the maximum value in the second frequency range, and the first preset frequency is less than the second preset frequency. The first equivalent resistance R e is the resistance of the loudspeaker at the first preset frequency, and the first preset frequency is the lowest frequency of the loudspeaker. The low-frequency impedance of the loudspeaker is close to the direct current resistance, so the first equivalent resistance R e can be obtained by extracting the impedance Z e of the lowest frequency of the loudspeaker. The first equivalent inductance L eThe first equivalent inductance L1 can be used as the inductance of the speaker in the first frequency range, and the second equivalent inductance L2 can be used as the inductance of the speaker in the second frequency range. The first frequency range can be the mid-high frequency range, and the second frequency range can be the mid-frequency range. The first equivalent inductance L2... e The second equivalent inductance L2 can represent the inductance of the loudspeaker in different frequency ranges, reflecting the inductance characteristics of the loudspeaker in different frequency ranges.

[0071] In some embodiments of the present invention, the impedance curves of the loudspeaker under different positional offsets are fitted, including:

[0072] The least squares method was used to fit the impedance curves of the speaker at different position offsets.

[0073] Specifically, the least squares method can find the best function match for the data by minimizing the sum of squares of the errors. By using the least squares method, the impedance curve of the loudspeaker can be fitted to obtain the formula for calculating the impedance of the loudspeaker with respect to frequency.

[0074] In some embodiments of the present invention, a curve showing the change of the first equivalent inductance with respect to the position offset is constructed based on the formula for calculating the impedance with respect to frequency corresponding to different position offsets, including:

[0075] Extract the first equivalent inductance L from the impedance calculation formula with respect to frequency corresponding to different position offsets. e The first equivalent inductance L in the formula for calculating the impedance with respect to frequency based on the offset at different positions. e Construct the first equivalent inductance L e Curve showing how positional offset changes.

[0076] Specifically, by extracting the first equivalent inductance L from the formula for calculating the impedance with respect to frequency corresponding to different position offsets... e The first equivalent inductance L can be constructed by fitting the data. e Curve showing how positional offset changes. Figure 5 The graph showing the change of the first equivalent inductance with position offset provided in the embodiments of the present invention is as follows: Figure 5 As shown, in the first equivalent inductance L e Curve L of position offset e In (x), the first equivalent inductance L e The electrical and acoustic performance of the loudspeaker varies with the position offset x, thus shortening the product design cycle of the loudspeaker's prototyping, testing, and improvement processes.

[0077] In related technologies, when using finite element simulation software to perform frequency domain simulation of the magnetic field of a loudspeaker's magnetic circuit and voice coil, the voice coil inductance at a certain frequency (e.g., 1kHz) is extracted. The voice coil position is then moved up and down for simulation, yielding the inductance nonlinearity curves at different displacements x. However, the inductance of a loudspeaker's magnetic circuit is frequency-dependent. This method only provides the inductance at a specific frequency; the inductance differs at different frequencies, and the trend of the inductance nonlinearity curve also differs, failing to accurately describe the loudspeaker's inductance characteristics. Figure 6 The following are curves showing the inductance of a loudspeaker at different frequencies, as provided in embodiments of the present invention. Figure 6 As shown, at the same frequency, the inductance L of the speaker changes with the position offset x. The inductance curve L(x) of the speaker also differs at different frequencies. For example, the frequency can include 500Hz, 1000Hz, 2000Hz, and 4000Hz. Because the inductance curve L(x) of the speaker differs at different frequencies, this inductance curve L(x) cannot accurately describe the inductance characteristics of the speaker, that is, it cannot accurately describe the change in the speaker's inductance with the position offset x. To describe the inductance characteristics of the speaker, in this embodiment of the invention, the first equivalent inductance L in the impedance-frequency calculation formula is used. e Characterizing the inductance characteristics of a loudspeaker, the first equivalent inductance L e It is related to the position offset and does not change with the frequency of the speaker, so it can more accurately reflect the inductive characteristics of the speaker, thereby shortening the product design cycle through the prototyping, testing and improvement process of the speaker.

[0078] In some embodiments of the present invention, when constructing the curve of the change of the first equivalent inductance with respect to the position offset based on the calculation formula of impedance with respect to frequency corresponding to different position offsets, the method for determining the parameters of the loudspeaker further includes:

[0079] S250, extract the second equivalent resistance R2 and the second equivalent inductance L2 from the formula for calculating the impedance with respect to frequency corresponding to different position offsets.

[0080] Specifically, the impedance calculation formula with respect to frequency includes a second equivalent resistance R2 and a second equivalent inductance L2. The second equivalent resistance R2 can be the resistance of the speaker at a second preset frequency, and the second equivalent inductance L2 can be the inductance of the speaker in the second frequency range. Both the second equivalent resistance R2 and the second equivalent inductance L2 also reflect the acoustic performance of the speaker. After obtaining the impedance calculation formulas with respect to frequency for different positional offsets, by extracting the second equivalent resistance R2 and the second equivalent inductance L2 from these formulas, curves for the second equivalent resistance R2 and the second equivalent inductance L2 can be constructed. These curves demonstrate the nonlinear relationship between the second equivalent resistance R2 and the second equivalent inductance L2.

[0081] S260, a second equivalent resistance R2 change curve with position offset is constructed according to the second equivalent resistance R2 under different position offsets.

[0082] Specifically, after obtaining the second equivalent resistance R2 under different position offsets, the second equivalent resistance R2 corresponding to different position offsets can be regarded as the change of the second equivalent resistance R2 with the position offset x, and accordingly, the second equivalent resistance R2 change curve with position offset can be constructed. Figure 7 The second equivalent resistance change curve with position offset provided by the embodiment of the present application is shown in FIG. 2. Figure 7 As shown in the second equivalent resistance R2 change curve with position offset R2(x), the second equivalent resistance R2 changes with the position offset x, the position offset x is the distance between the center of the voice coil and the center of the magnetic circuit of the loudspeaker, the positive direction can be defined as that the center of the voice coil is offset upward relative to the center of the magnetic circuit of the loudspeaker, the position offset x is greater than 0, the positive direction can be defined as that the center of the voice coil is offset downward relative to the center of the magnetic circuit of the loudspeaker, the position offset x is less than 0, when the position offset x is 0, the second equivalent resistance R2 is maximum, and when the absolute value |x| of the position offset gradually increases from 0, the second equivalent resistance R2 gradually decreases.

[0083] S270, a second equivalent inductance L2 change curve with position offset is constructed according to the second equivalent inductance L2 under different position offsets.

[0084] Specifically, after obtaining the second equivalent inductance L2 under different position offsets, the second equivalent inductance L2 corresponding to different position offsets can be regarded as the change of the second equivalent inductance L2 with the position offset x, and accordingly, the second equivalent inductance L2 change curve with position offset can be constructed. Figure 8 The second equivalent inductance change curve with position offset provided by the embodiment of the present application is shown in FIG. 3. Figure 8 As shown in the second equivalent inductance L2 change curve with position offset L2(x), the second equivalent inductance L2 changes with the position offset x, and the second equivalent inductance L2 is maximum when the position offset x is -1. By constructing the second equivalent resistance R change curve with position offset and the second equivalent inductance L2 change curve with position offset, the nonlinear relationship between the second equivalent resistance R2 change curve with position offset and the second equivalent inductance L2 change curve with position offset can be considered when the loudspeaker is analyzed for distortion, and the accuracy of the distortion calculation is further improved.

[0085] The loudspeaker parameter determination method provided by the embodiment of the present application can construct the first equivalent inductance Le a curve of the second equivalent inductance L2 changing with the position offset, a curve of the second equivalent resistance R2 changing with the position offset, a curve of the second equivalent inductance L2 changing with the position offset, a curve of the second equivalent resistance R2 changing with the position offset γ The curve of the second equivalent inductance L2 changing with the position offset can more accurately reflect the inductance characteristics of the loudspeaker, thereby shortening the product design cycle of the trial production, testing and improvement process of the loudspeaker,

[0086] The embodiment of the present application also provides a parameter determination system of a loudspeaker, Figure 9 For a structural schematic diagram of the parameter determination system of the loudspeaker in the embodiment of the present application, the parameter determination system of the loudspeaker in the embodiment of the present application is used to execute the parameter determination method of the loudspeaker in any embodiment of the present application, as shown in the figure, Figure 9 The parameter determination system of the loudspeaker comprises:

[0087] The acquisition module 10 is used to acquire the impedance curves of the loudspeaker under different position offsets; wherein the position offset is the distance between the center of the voice coil and the center of the magnetic circuit of the loudspeaker, and the impedance curve is the curve of the impedance of the loudspeaker changing with the frequency.

[0088] The fitting module 20 is used to fit the impedance curves of the loudspeaker under different position offsets respectively to obtain the calculation formula of the impedance about the frequency corresponding to different position offsets; wherein the calculation formula of the impedance about the frequency at least comprises the first equivalent inductance, and the first equivalent inductance is the inductance of the loudspeaker in the first frequency range.

[0089] The curve construction module 30 is used to construct the curve of the first equivalent inductance changing with the position offset according to the calculation formula of the impedance about the frequency corresponding to different position offsets.

[0090] Specifically, referring to Figure 2 The acquisition module 10 can acquire the impedance curves of the loudspeaker 100 under different position offsets, the position offset is the distance between the center of the voice coil 120 and the center of the magnetic circuit 110 of the loudspeaker, and the impedance curve is the curve of the impedance of the loudspeaker 100 changing with the frequency. The fitting module 20 fits the impedance curves of the loudspeaker 100 under different position offsets respectively to obtain the calculation formula of the impedance about the frequency corresponding to different position offsets. In order to describe the inductance characteristics of the loudspeaker 100 under different position offsets, the curve construction module 30 can construct the curve of the first equivalent inductance changing with the position offset according to the first equivalent inductance in the calculation formula of the impedance about the frequency corresponding to different position offsets. The first equivalent inductance in the curve of the first equivalent inductance changing with the position offset is related to the position offset and does not change with the frequency of the loudspeaker 100. The curve of the first equivalent inductance changing with the position offset can more accurately reflect the inductance characteristics of the loudspeaker 100, thereby shortening the product design cycle of the trial production, testing and improvement process of the loudspeaker 100.

[0091] The embodiment of the present application provides a parameter determination system of a loudspeaker, the parameter determination system of the loudspeaker obtains the impedance curve of the loudspeaker under different position offsets through an acquisition module, the position offset is the distance between the center of the voice coil and the center of the magnetic circuit of the loudspeaker, the impedance curve is the curve of the impedance of the loudspeaker changing with the frequency, which can reflect the change of the impedance of the loudspeaker with the frequency, the fitting module can obtain the calculation formula of the impedance about the frequency corresponding to different position offsets by fitting the impedance curve of the loudspeaker under different position offsets respectively, the calculation formula of the impedance about the frequency can describe the impedance characteristics of the loudspeaker, the calculation formula of the impedance about the frequency includes the first equivalent inductance, the curve construction module can construct the curve of the first equivalent inductance changing with the position offset according to the calculation formula of the impedance about the frequency corresponding to different position offsets, the first equivalent inductance is related to the position offset and does not change with the frequency of the loudspeaker, which can more accurately reflect the inductance characteristics of the loudspeaker, so as to shorten the product design cycle of the trial production, testing and improvement process of the loudspeaker.

[0092] In some embodiments of the present application, the parameter determination system of the loudspeaker further comprises a simulation module, Figure 10 For another structure diagram of the parameter determination system of the loudspeaker in the embodiment of the present application, as Figure 10 shown, the parameter determination system of the loudspeaker further comprises a simulation module 40 for obtaining the three-dimensional model of the loudspeaker magnetic circuit and the voice coil, the material parameters and the voice coil design parameters, establishing a finite element model according to the three-dimensional model of the loudspeaker magnetic circuit and the voice coil, the material parameters and the voice coil design parameters to simulate the loudspeaker; wherein the simulation module 40 comprises a finite element simulation software.

[0093] Specifically, the simulation module 40 can include a finite element simulation software, the simulation module 40 can simulate the loudspeaker by using the finite element simulation software, and the finite element simulation software can include Maxwell, Cosmol.

[0094] Specifically, the simulation module 40 can obtain the three-dimensional model of the loudspeaker magnetic circuit and the voice coil, the material parameters and the voice coil design parameters, the three-dimensional model of the loudspeaker magnetic circuit and the voice coil can be drawn by a three-dimensional drawing software, and the three-dimensional model of the loudspeaker magnetic circuit and the voice coil is input into the finite element simulation software, a finite element model is established according to the three-dimensional model of the loudspeaker magnetic circuit and the voice coil, the material parameters and the voice coil design parameters to simulate the loudspeaker. In the finite element simulation software, the simulation module 40 can define the material parameters and the voice coil design parameters of the loudspeaker magnetic circuit and the voice coil, so as to establish the finite element model, in addition, the load and the boundary of the loudspeaker magnetic circuit and the voice coil in the finite element model can also be defined to improve the accuracy of the finite element model.

[0095] Optionally, the acquisition module 10 comprises a control unit and an acquisition unit, the control unit is used for controlling the center of the voice coil to move relative to the center of the magnetic circuit of the loudspeaker, and the acquisition unit is used for acquiring the impedance curve of the loudspeaker under different position offsets.

[0096] Specifically, the control unit is used for controlling the center of the voice coil to move relative to the center of the magnetic circuit of the loudspeaker, so that the distance between the center of the voice coil and the center of the magnetic circuit of the loudspeaker is a preset distance, forming different position offsets x, for example, the position offset x can be-4, -3, -2, -1, 0, 1, 2, 3, 4mm, and the acquisition unit acquires the impedance curve of the loudspeaker under different position offsets x, respectively, so that the impedance curve of the loudspeaker under different position offsets can be obtained, and the impedance of the loudspeaker under different position offsets about the frequency calculation formula can be calculated by acquiring the impedance curve Ze(f) of the loudspeaker under different position offsets x.

[0097] In addition, the parameter determination system of the loudspeaker of the embodiment of the present application includes but is not limited to the above modules, and the parameter determination system of the loudspeaker of the embodiment of the present application can adaptively set the functional modules related to the parameter determination method of the loudspeaker in any embodiment of the present application to realize the functions and technical effects of the parameter determination method of the loudspeaker in any embodiment of the present application.

[0098] The embodiment of the present application provides a parameter determination system of a loudspeaker, and the parameter determination system of the loudspeaker curve construction module can construct the first equivalent inductance change curve with the position offset according to the impedance about the frequency calculation formula corresponding to the different position offsets, the first equivalent inductance is related to the position offset and does not change with the frequency of the loudspeaker, which can more accurately reflect the inductance characteristics of the loudspeaker, thereby shortening the product design cycle of the trial production, testing and improvement process of the loudspeaker.

[0099] Note that the above is only the preferred embodiment of the present application and the technical principle applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A method of parameter determination of a loudspeaker, characterized by, The loudspeaker comprises a loudspeaker magnetic circuit and a voice coil, the voice coil is located at the inner side of the loudspeaker magnetic circuit, and the parameter determination method of the loudspeaker comprises: Obtaining the impedance curve of the loudspeaker under different position offsets; wherein the position offset is the distance between the center of the voice coil and the center of the loudspeaker magnetic circuit, and the impedance curve is the curve of the impedance of the loudspeaker changing with frequency; Fitting the impedance curve of the loudspeaker under different position offsets respectively to obtain the calculation formula of the impedance about frequency corresponding to different position offsets; wherein the calculation formula of the impedance about frequency at least comprises a first equivalent inductance, and the first equivalent inductance is the inductance of the loudspeaker in a first frequency range; According to the calculation formula of the impedance about frequency corresponding to different position offsets, a curve of the first equivalent inductance changing with the position offset is constructed.

2. The parameter determination method of a loudspeaker according to claim 1, characterized in that, Obtaining the impedance curve of the loudspeaker under different position offsets, comprising: Controlling the center of the voice coil to move relative to the center of the loudspeaker magnetic circuit; Obtaining the impedance curve of the loudspeaker under different position offsets.

3. The parameter determination method of a loudspeaker according to claim 1, characterized in that, Before obtaining the impedance curve of the loudspeaker under different position offsets, further comprising: Obtaining the three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and the voice coil; In a finite element simulation software, a finite element model is established according to the three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and the voice coil to simulate the loudspeaker.

4. The parameter determination method of a loudspeaker according to claim 1, characterized in that, Fitting the impedance curve of the loudspeaker under different position offsets respectively to obtain the calculation formula of the impedance about frequency corresponding to different position offsets, comprising: Fitting the impedance curve of the loudspeaker under different position offsets respectively to obtain the calculation formula of the impedance about frequency corresponding to different position offsets; The calculation formula of the impedance of the loudspeaker about frequency satisfies: wherein Z e is the impedance of the loudspeaker, Z e (f) represents the impedance of the loudspeaker as a function of frequency, f is the frequency of the loudspeaker, R e is a first equivalent resistance, the first equivalent resistance R e is the resistance of the loudspeaker at a first predetermined frequency, ω is the angular frequency, ω = 2πf, j is the imaginary unit, L e is the first equivalent inductance, R2 is a second equivalent resistance, the second equivalent resistance R2 is the resistance of the loudspeaker at a second predetermined frequency, L2 is a second equivalent inductance, the second equivalent inductance L2 is the inductance of the loudspeaker in a second frequency range, the inductance parameters comprising the first equivalent inductance L e , the second equivalent resistance R2 and the second equivalent inductance L2; in the calculation formula of the impedance about frequency corresponding to the same said position offset, the first equivalent resistance R e , the first equivalent inductance L e , the second equivalent resistance R2 and the second equivalent inductance L2 are constants.

5. The parameter determination method of a loudspeaker according to claim 4, characterized in that, According to the calculation formula of the impedance about frequency corresponding to different position offsets, a curve of the first equivalent inductance changing with the position offset is constructed, comprising: extracting the first equivalent inductance L in the calculation formula of the impedance about frequency corresponding to different position offsets e ; The first equivalent inductance L in the calculation formula of the impedance about frequency corresponding to different position offsets e , the first equivalent inductance L is constructed e The curve of the change of the position offset.

6. The parameter determination method of a loudspeaker according to claim 5, wherein, Fitting the impedance curve of the loudspeaker under different position offsets respectively, comprising: Using the least square method to fit the impedance curve of the loudspeaker under different position offsets respectively.

7. The parameter determination method of a loudspeaker according to claim 4, wherein, According to the calculation formula of the impedance about frequency corresponding to different position offsets, a curve of the first equivalent inductance changing with the position offset is constructed, further comprising: Extracting the second equivalent resistance R2 and the second equivalent inductance L2 in the calculation formula of the impedance about frequency corresponding to different position offsets; According to the second equivalent resistance R2 under different position offsets, a curve of the second equivalent resistance R2 changing with the position offset is constructed; According to the second equivalent inductance L2 under different position offsets, a curve of the second equivalent inductance L2 changing with the position offset is constructed.

8. A parameter determination system of a loudspeaker, characterized by, The parameter determination system of the loudspeaker is used to execute the parameter determination method of the loudspeaker in any one of claims 1-7, and the parameter determination system of the loudspeaker comprises: An obtaining module is configured to obtain impedance curves of the loudspeaker at different position offsets, wherein the position offset is a distance between a center of the voice coil and a center of a magnetic circuit of the loudspeaker, and the impedance curve is a curve of impedance of the loudspeaker varying with frequency; A fitting module is configured to fit the impedance curves of the loudspeaker at different position offsets respectively to obtain impedance calculation formulas about frequency corresponding to the different position offsets, wherein the impedance calculation formula about frequency at least includes a first equivalent inductance, and the first equivalent inductance is an inductance of the loudspeaker in a first frequency range; A curve constructing module is configured to construct a curve of the first equivalent inductance varying with the position offset according to the impedance calculation formulas about frequency corresponding to the different position offsets.

9. The parameter determination system of a loudspeaker according to claim 8, characterized in that, Further comprising: An emulation module is configured to obtain a three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and the voice coil, and establish a finite element model according to the three-dimensional model, material parameters and voice coil design parameters of the loudspeaker magnetic circuit and the voice coil to emulate the loudspeaker, wherein the emulation module includes a finite element emulation software.

10. The parameter determination system of claim 8, wherein, The obtaining module comprises: A control unit is configured to control the center of the voice coil to move relative to the center of the loudspeaker magnetic circuit; An obtaining unit is configured to obtain the impedance curves of the loudspeaker at different position offsets.

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