CN113286233A - Loudspeaker simulation method, loudspeaker simulation device, loudspeaker and electronic equipment - Google Patents

Loudspeaker simulation method, loudspeaker simulation device, loudspeaker and electronic equipment Download PDF

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CN113286233A
CN113286233A CN202110554428.0A CN202110554428A CN113286233A CN 113286233 A CN113286233 A CN 113286233A CN 202110554428 A CN202110554428 A CN 202110554428A CN 113286233 A CN113286233 A CN 113286233A
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CN113286233B (en
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蒋国珠
李伟
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Vivo Mobile Communication Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

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Abstract

The application discloses a loudspeaker simulation method, a loudspeaker simulation device, a loudspeaker and electronic equipment, which belong to the technical field of model simulation, wherein the method comprises the following steps: based on the lumped parameter model and the voice coil vibration related parameters, establishing a nonlinear equation system of the loudspeaker module, wherein the loudspeaker module comprises a loudspeaker unit and a voice cavity, and the voice coil vibration related parameters comprise: relevant parameters of a magnetic circuit and a vibration component in the loudspeaker unit and coupling parameters between the loudspeaker unit and the sound cavity; establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set; acquiring a TS parameter and a first nonlinear parameter of the loudspeaker unit and a second nonlinear parameter of the sound cavity; and inputting the TS parameters, the first nonlinear parameters and the second nonlinear parameters into the nonlinear distortion simulation model, and calculating a nonlinear distortion result of the loudspeaker module.

Description

Loudspeaker simulation method, loudspeaker simulation device, loudspeaker and electronic equipment
Technical Field
The embodiment of the invention relates to the technical field of model simulation, in particular to a loudspeaker simulation method, a loudspeaker simulation device, a loudspeaker and electronic equipment.
Background
As the electronic device structure becomes extremely thin and light, the structure of the speaker module for generating sound therein becomes increasingly complex. The extremely complicated sound cavity structure in the speaker module has the risk of exciting noise and distortion, so that the design personnel need to consider the extremely complicated structure and high-quality tone quality when designing the speaker module.
Total Harmonic Distortion (THD) is a general indicator for evaluating sound quality, and the purity of sound can be known through a THD curve, and the sound quality level of a speaker assembly can be determined to a certain extent, such as the efficiency of research and development of the speaker assembly can be greatly improved by simulating THD. The existing THD simulation method for the loudspeaker simplifies the loudspeaker into a 2D axisymmetric structure for simulation, is effective for a circular axisymmetric loudspeaker, does not contain the simulation of a sound cavity part, and cannot be suitable for the nonlinear distortion simulation of a loudspeaker component with a complex structure arranged in electronic equipment.
Disclosure of Invention
The embodiment of the application aims to provide a loudspeaker simulation method, a loudspeaker simulation device, a loudspeaker and electronic equipment, and can solve the problem that the existing THD simulation method cannot be applied to nonlinear distortion simulation of loudspeaker components with complex structures.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a loudspeaker simulation method, where the method includes: based on the lumped parameter model and the voice coil vibration related parameters, establishing a nonlinear equation system of the loudspeaker module, wherein the loudspeaker module comprises a loudspeaker unit and a voice cavity, and the voice coil vibration related parameters comprise: relevant parameters of a magnetic circuit and a vibration component in the loudspeaker unit and coupling parameters between the loudspeaker unit and the sound cavity; establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set; acquiring a TS parameter and a first nonlinear parameter of the loudspeaker unit and a second nonlinear parameter of the sound cavity; and inputting the TS parameters, the first nonlinear parameters and the second nonlinear parameters into the nonlinear distortion simulation model, and calculating a nonlinear distortion result of the loudspeaker module.
In a second aspect, an embodiment of the present application provides a loudspeaker simulation apparatus, where the apparatus includes: the first establishing module is used for establishing a nonlinear equation set of the loudspeaker module based on the lumped parameter model and the voice coil vibration related parameters, wherein the loudspeaker module comprises a loudspeaker unit and a voice cavity, and the voice coil vibration related parameters comprise: relevant parameters of a magnetic circuit and a vibration component in the loudspeaker unit and coupling parameters between the loudspeaker unit and the sound cavity; the second establishing module is used for establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set; the parameter acquisition module is used for acquiring a TS parameter and a first nonlinear parameter of the loudspeaker unit and a second nonlinear parameter of the sound cavity; and the calculation module is used for inputting the TS parameters, the first nonlinear parameters and the second nonlinear parameters into the nonlinear distortion simulation model and calculating a nonlinear distortion result of the loudspeaker module.
In a third aspect, an embodiment of the present application provides an electronic device, which includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and when executed by the processor, the program or instructions implement the steps of the method according to the first aspect.
In a fourth aspect, an embodiment of the present application provides a speaker, where the speaker is prepared according to relevant parameters after verifying a nonlinear distortion result according to the steps in the speaker simulation method according to the first aspect.
In a fifth aspect, the present embodiments provide a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the first aspect.
In a sixth aspect, an embodiment of the present application provides a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the method according to the first aspect.
In the embodiment of the application, a nonlinear equation set comprising a loudspeaker unit and an audio cavity loudspeaker module is established based on a lumped parameter model and voice coil vibration related parameters; and establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set, wherein the established nonlinear distortion simulation model comprises the simulation of both the loudspeaker unit and the sound cavity. Obtaining TS parameters and first nonlinear parameters of a loudspeaker unit and second nonlinear parameters of a sound cavity; and inputting the TS parameter, the first nonlinear parameter and the second nonlinear parameter into a nonlinear distortion simulation model, calculating a nonlinear distortion result of the loudspeaker module, and comprehensively considering the influence of the loudspeaker unit and the sound cavity on the audio nonlinear distortion, so that the simulated nonlinear distortion result is more reliable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a flow chart illustrating the steps of a loudspeaker simulation method according to an embodiment of the present application;
fig. 2 is a sectional view showing a speaker module according to an embodiment of the present application;
FIG. 3 is a BL (x) simulation model illustrating an embodiment of the present application;
FIG. 4 is a non-linear parametric simulation model of a chamber illustrating an embodiment of the present application;
FIG. 5 is a diagram illustrating transient waveforms in accordance with an embodiment of the present application;
FIG. 6 is a spectrum diagram illustrating an embodiment of the present application;
fig. 7 is a block diagram showing a configuration of a speaker simulation apparatus according to an embodiment of the present application;
fig. 8 is a block diagram showing a configuration of an electronic apparatus according to an embodiment of the present application;
fig. 9 is a schematic diagram showing a hardware configuration of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The speaker simulation method provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 1, a flowchart illustrating steps of a speaker simulation method according to an embodiment of the present application is shown.
The loudspeaker simulation method comprises the following steps:
step 101: and establishing a nonlinear equation set of the loudspeaker module based on the lumped parameter model and the voice coil vibration related parameters.
The loudspeaker simulation method provided by the embodiment of the application is used for simulating the nonlinear distortion of the loudspeaker module comprising the loudspeaker unit and the sound cavity structure. Fig. 2 shows a cross-sectional view of a speaker module, which includes a speaker unit 201, a front cavity 202, a rear cavity 203, a dust screen 204, a sound guide channel 205, and the like, wherein the sound guide channel includes a channel formed in the speaker module and a channel formed by a sound outlet hole and the like of a whole structure portion. The front cavity 202, the rear cavity 203 and the sound guide channel 205 constitute a sound cavity of the speaker module.
The lumped parameter model is the simplest model in unsteady heat conduction, and each variable of the model in the lumped parameter model is independent of the space position, and the variable is regarded as uniform in the whole system, and is an algebraic equation for the steady-state model and an ordinary differential equation for the dynamic model. The parameters related to the vibration of the voice coil include: relevant parameters of a magnetic circuit and a vibration component in the loudspeaker unit and coupling parameters between the loudspeaker unit and the sound cavity. When a nonlinear equation set is established based on the lumped parameter model and the voice coil vibration related parameters, all the components in the loudspeaker unit are represented by lumped parameters, and the nonlinear parameters of the loudspeaker unit and the voice cavity are added into the lumped parameters of all the components to form a nonlinear array. And constructing a nonlinear equation set by combining kirchhoff law and Newton's second law.
The nonlinear equation system of the vibration of the constructed loudspeaker module in the time domain is as follows:
Figure BDA0003076576040000051
Figure BDA0003076576040000052
Figure BDA0003076576040000053
wherein e (t) represents the transient input voltage signal, i1、i2Representing the current through the voice coil and the current of the quasi-inductor, Le, Re, L, respectively2、R2Respectively, inductance, quasi-resistance, BL is force coefficientThe Mms, the Rms and the Kms respectively represent the equivalent mass, the equivalent mechanical resistance and the equivalent elastic coefficient of the vibration system, and the above parameters are related to the loudspeaker unit. FanlAnd ZmAnd v respectively represents the reaction force of the back cavity and the front cavity to the diaphragm and is a coupling parameter between the loudspeaker unit and the sound cavity. In the formula, the parameter suffixed (x) represents a variation curve with the displacement x.
Step 102: and establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set.
In the step, a nonlinear distortion simulation model of the loudspeaker module is constructed by using a programming technology and a typical nonlinear equation solving algorithm on the basis of the constructed nonlinear equation set. The adopted typical nonlinear equation solving algorithm can be a parameter spline difference method, a harmonic balance method or a Runge-Kutta method and the like. Preferably, a parameter spline difference method is adopted, the solving algorithm of the parameter spline difference method is high in solution precision, more harmonic components can be obtained, and the calculation amount is small.
The construction of the solving logic in the nonlinear distortion simulation model is completed through step 102, and the operation can be completed only by inputting the linear TS parameter describing the performance of the loudspeaker unit, the nonlinear parameter of the loudspeaker unit and the nonlinear parameter of the cavity. The non-linearity parameter of the speaker unit can be expressed as a first non-linearity parameter, and the cavity non-linearity parameter can be expressed as a second non-linearity parameter.
Step 103: and acquiring the TS parameter and the first nonlinear parameter of the loudspeaker unit and the second nonlinear parameter of the sound cavity.
T in TS represents mr. Thiele, S represents mr. snermor, TS parameter is mr. Thiele, and S represents relevant parameters of the speaker unit described in the relevant literature on testing and design of the speaker unit published by mr. snermor. The TS parameters include small signal parameters and large signal parameters, wherein the small signal parameters include: the resonance frequency of a vibration system of the speaker unit, the equivalent volume of the acoustic compliance of the speaker unit, the mechanical damping factor of the speaker unit, and the electromagnetic damping factor of the speaker unit; the large signal parameters include: maximum power rating determined by the heat dissipation capability of the speaker unit, volume pushed by the diaphragm at maximum amplitude.
The first non-linearity parameters include, but are not limited to: BL (x), Cms (x), and Le (x), which are key parameters describing the nonlinear characteristics of the speaker unit, wherein BL (x), Cms (x), Le (x) respectively represent the variation curves of the force coefficient BL, the compliance Cms of the vibration system, and the inductance Le at different displacements x.
The second non-linearity parameters include, but are not limited to: nonlinear air resistance Rp (v), nonlinear air stiffness Ca (x).
In this step, the manner of obtaining the first nonlinear parameter and the second nonlinear parameter is not particularly limited.
Step 104: and inputting the TS parameter, the first nonlinear parameter and the second nonlinear parameter into a nonlinear distortion simulation model, and calculating a nonlinear distortion result of the loudspeaker module.
After the TS parameter, the first nonlinear parameter, and the second nonlinear parameter are input into the nonlinear distortion simulation model, the specified frequency may be input to obtain the Total Harmonic Distortion (THD) at the specified frequency. Parameters in the nonlinear distortion simulation model are related to frequencies, THD under each frequency can be obtained by establishing frequency scanning, a simulation THD curve can be established by the THD under each frequency, and the established simulation THD curve is a nonlinear distortion result. The frequency scanning is the operation of automatically inputting different frequencies into the nonlinear distortion simulation model by the system.
Comparing the simulated THD curve with the actually measured THD curve, and enabling the trend of the THD curve obtained by simulation to be consistent with that of the actually measured THD curve.
According to the loudspeaker simulation method provided by the embodiment of the application, a nonlinear equation set comprising a loudspeaker unit and an audio cavity loudspeaker module is established based on a lumped parameter model and voice coil vibration related parameters; and establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set, wherein the established nonlinear distortion simulation model comprises the simulation of both the loudspeaker unit and the sound cavity. Obtaining TS parameters and first nonlinear parameters of a loudspeaker unit and second nonlinear parameters of a sound cavity; and inputting the TS parameter, the first nonlinear parameter and the second nonlinear parameter into a nonlinear distortion simulation model, calculating a nonlinear distortion result of the loudspeaker module, and comprehensively considering the influence of the loudspeaker unit and the sound cavity on the audio nonlinear distortion, so that the simulated nonlinear distortion result is more reliable.
In an alternative embodiment, the manner of obtaining the TS parameter and the first non-linearity parameter of the speaker unit may be as follows: testing TS parameters of the loudspeaker unit through a Klippel LPM module; the first non-linearity parameter of the speaker unit is tested by the Klippel LSI module.
The Klippel analyzer is a computer and its corollary equipment used in the technical field of electronics and communications, and mainly includes Modules such as LPM (Library of Parameterized Modules), LSI (Large-scale integrated circuit), and SIM (Subscriber Identity Module).
The method for optionally acquiring the relevant parameters of the loudspeaker unit is based on the existing Klippel analysis instrument to test the relevant parameters of the loudspeaker unit, does not need to add extra test equipment, and is easy to implement.
In addition to testing the first nonlinear parameter of the speaker unit by the Klippel LSI module, finite element modeling may be performed on a pertinence basis to obtain the first nonlinear parameter of the speaker unit.
The finite element modeling logic simulates the change of a first nonlinear parameter of the loudspeaker unit when the voice coil vibrates up and down, and a specific model needs to be established according to a physical field mainly influenced by each parameter. An exemplary bl (x) simulation model is shown in fig. 3, and includes: the soft iron 301, the voice coil 302 and the permanent magnet 303, in order to simplify the calculation, 1/4 magnetic circuit structures can be selected according to the symmetry, and the change of BL value received by the voice coil along with x can be solved by moving the position of the voice coil.
In an alternative embodiment, the manner of obtaining the second non-linearity parameter of the sound cavity may include the following sub-steps:
the first substep: and constructing a finite element simulation model of the nonlinear parameter of the sound cavity.
Wherein, the schematic diagram of the sound cavity nonlinear parameter finite element simulation model is shown in fig. 4, and the sound cavity nonlinear parameter finite element simulation model comprises: a front cavity channel 401, a sound inlet 402 and a sound outlet 403, the first side of the sound inlet facing the voice coil diaphragm.
And a second substep: the first surface of the sound inlet is attached to the voice coil vibrating diaphragm, and a piston radiation boundary condition is set at the sound outlet to simulate an outward radiation environment.
And a third substep: and adjusting the initial flow value of the inlet orifice for multiple times, and solving the nonlinear air resistance of the sound cavity at different flow velocities.
And a fourth substep: and calculating the nonlinear air stiffness of the sound cavity based on the change of the equivalent area of the voice coil diaphragm along with the vibration displacement of the diaphragm and the physical equation of the adiabatic process.
The non-linear air stiffness of the sound cavity can be expressed as ca (x), when the closed type speaker unit operates in a large signal state, the non-linear effect will be generated by the air stiffness of the sound cavity, and further the performance of the speaker module is affected, and the non-linear effect will be generated by characterizing the air stiffness of the sound cavity by the non-linear air stiffness of the sound cavity.
In this way, the second non-linear parameter of the sound cavity can be optionally obtained, and the obtained second linear parameter has high accuracy.
In an optional embodiment, the manner of inputting the TS parameter, the first nonlinear parameter and the second nonlinear parameter into the nonlinear distortion simulation model to obtain the nonlinear distortion result of the speaker module may include the following sub-steps:
the first substep: and inputting the TS parameter, the first nonlinear parameter and the second nonlinear parameter into a nonlinear distortion simulation model.
After the nonlinear equation set of the loudspeaker module is converted into the nonlinear distortion simulation model, the nonlinear distortion simulation operation can be carried out only by constructing a solving logic in the nonlinear distortion simulation model and inputting a linear TS parameter for describing the performance of the loudspeaker unit, a nonlinear parameter of the loudspeaker unit and a cavity nonlinear parameter.
And a second substep: and inputting different frequency values into the nonlinear distortion simulation model respectively to obtain the transient sound pressure of the audio frequency of the loudspeaker module radiating to the test point under different frequencies.
After the frequency is input into the nonlinear distortion simulation model, the simulated transient waveform diagram and the simulated frequency spectrogram are respectively shown in fig. 5 and fig. 6. And determining the transient sound pressure radiated to the test point by the audio of the loudspeaker module at the input frequency through the transient waveform diagram and the spectrogram.
And a third substep: and calculating the total harmonic distortion of the audio frequency of the loudspeaker module radiating to the test point under different frequencies according to the transient sound pressures.
Substep two and substep three are THD solution processes. In the solving process, the vibration velocity u (t) of the outlet of the speaker module on the time domain can be solved, and the transient sound pressure p (t) radiated to the test point by the speaker module is calculated, and then the THD on the frequency domain of the test point position is obtained through conversion of the transient sound pressure p (t). Each frequency corresponds to one total harmonic distortion, and a THD curve, namely a nonlinear distortion result, can be generated based on the total harmonic distortion corresponding to a plurality of frequencies.
The method optionally simulates the nonlinear distortion result of the loudspeaker model, and the obtained nonlinear distortion result has high accuracy.
In an alternative embodiment, the manner of calculating the total harmonic distortion of the audio radiated to the test point by the speaker module at different frequencies according to the transient sound pressures can be as follows:
firstly, aiming at each transient sound pressure, obtaining each harmonic corresponding to the transient sound pressure through the fast Fourier transform of a time domain and a frequency domain;
the harmonics corresponding to the transient sound pressure include: fundamental, 2 nd harmonic, 3 rd harmonic, etc.
And secondly, determining total harmonic distortion of the audio radiation of the loudspeaker module to the test point according to each harmonic and the transient sound pressure.
In practical implementation, THD can be calculated by the following formula:
Figure BDA0003076576040000101
wherein Pt is transient sound pressure, P1 is fundamental wave amplitude, P2 is secondary wave amplitude, and Pn means n-order wave amplitude.
The process of determining the THD of the audio radiation of the loudspeaker module at the specified frequency to the test point based on the transient sound pressure at the specified frequency is described above, and in the actual implementation process, the process can be repeatedly executed to respectively determine the THD corresponding to the transient sound pressure at each frequency.
The mode of optionally determining the THD of the audio radiation of the loudspeaker module to the test point has small calculation amount and high accuracy.
It should be noted that, in the loudspeaker simulation method provided in the embodiment of the present application, the execution main body may be a simulation device, or a control module in the simulation device for executing the simulation method. In the embodiment of the present application, a method for executing speaker simulation by using a simulation apparatus is taken as an example to describe the simulation apparatus provided in the embodiment of the present application.
Fig. 7 is a block diagram of a speaker simulation apparatus for implementing an embodiment of the present application.
The speaker simulation apparatus 700 according to the embodiment of the present application includes:
a first establishing module 701, configured to establish a nonlinear equation set of a speaker module based on a lumped parameter model and a voice coil vibration-related parameter, where the speaker module includes a speaker unit and a sound cavity, and the voice coil vibration-related parameter includes: relevant parameters of a magnetic circuit and a vibration component in the loudspeaker unit and coupling parameters between the loudspeaker unit and the sound cavity;
a second establishing module 702, configured to establish a nonlinear distortion simulation model of the speaker module according to the nonlinear equation set;
a parameter obtaining module 703, configured to obtain a TS parameter and a first nonlinear parameter of the speaker unit, and a second nonlinear parameter of the sound cavity;
a calculating module 704, configured to input the TS parameter, the first nonlinear parameter, and the second nonlinear parameter into the nonlinear distortion simulation model, and calculate a nonlinear distortion result of the speaker module.
Optionally, the parameter obtaining module includes:
a first sub-module for testing TS parameters of the speaker unit by a Klippel LPM module;
a second sub-module for testing a first non-linearity parameter of the speaker unit by a Klippel LSI module.
Optionally, the parameter obtaining module includes:
the construction submodule is used for constructing a sound cavity nonlinear parameter finite element simulation model, wherein the finite element simulation model comprises: the front cavity channel, the sound inlet and the sound outlet are formed, and the first surface of the sound inlet is opposite to the voice coil vibrating diaphragm;
the simulation submodule is used for attaching the first surface of the sound inlet to the voice coil vibrating diaphragm and setting a piston radiation boundary condition at the sound outlet so as to simulate an outward radiation environment;
the adjusting submodule is used for adjusting the initial flow value of the inlet orifice for multiple times and solving the nonlinear air resistance of the sound cavity at different flow speeds;
and the first calculation submodule is used for calculating the nonlinear air stiffness of the sound cavity based on the change of the equivalent area of the voice coil diaphragm along with the vibration displacement of the diaphragm and a physical equation of the adiabatic process.
Optionally, the calculation module comprises:
the first input submodule is used for inputting the TS parameter, the first nonlinear parameter and the second nonlinear parameter into the nonlinear distortion simulation model;
the second input submodule is used for inputting different frequency values into the nonlinear distortion simulation model respectively to obtain transient sound pressure of the audio frequency of the loudspeaker module radiating to a test point under different frequencies;
and the second calculation submodule is used for calculating the total harmonic distortion of the audio frequency of the loudspeaker module radiating to the test point under different frequencies according to the transient sound pressures.
Optionally, the second computation submodule includes:
the transformation unit is used for obtaining each harmonic corresponding to the transient sound pressure through the fast Fourier transform of a time domain and a frequency domain aiming at each transient sound pressure;
and the determining unit is used for determining total harmonic distortion of the audio radiation of the loudspeaker module to a test point according to the subharmonics and the transient sound pressure.
The loudspeaker simulation device provided by the embodiment of the application establishes a nonlinear equation set comprising a loudspeaker unit and a sound cavity loudspeaker module based on a lumped parameter model and voice coil vibration related parameters; and establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set, wherein the established nonlinear distortion simulation model comprises the simulation of both the loudspeaker unit and the sound cavity. Obtaining TS parameters and first nonlinear parameters of a loudspeaker unit and second nonlinear parameters of a sound cavity; and inputting the TS parameter, the first nonlinear parameter and the second nonlinear parameter into a nonlinear distortion simulation model, calculating a nonlinear distortion result of the loudspeaker module, and comprehensively considering the influence of the loudspeaker unit and the sound cavity on the audio nonlinear distortion, so that the simulated nonlinear distortion result is more reliable.
The speaker simulation apparatus shown in fig. 7 in the embodiment of the present application may be an apparatus, or may be a component, an integrated circuit, or a chip in a terminal. The device can be mobile electronic equipment or non-mobile electronic equipment. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a Network Attached Storage (NAS), a personal computer (personal computer, PC), a Television (TV), a teller machine, a self-service machine, and the like, and the embodiments of the present application are not limited in particular.
The speaker simulation apparatus shown in fig. 7 in the embodiment of the present application may be an apparatus having an operating system. The operating system may be an Android operating system (Android), an iOS operating system, or other possible operating systems, which is not specifically limited in the embodiments of the present application.
The loudspeaker simulation apparatus shown in fig. 7 provided in the embodiment of the present application can implement each process implemented by the method embodiments of fig. 1 to fig. 6, and is not described here again to avoid repetition.
Optionally, as shown in fig. 8, an electronic device 800 is further provided in this embodiment of the present application, and includes a processor 801, a memory 802, and a program or an instruction stored in the memory 802 and executable on the processor 801, where the program or the instruction is executed by the processor 801 to implement each process of the above-mentioned speaker simulation method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and the non-mobile electronic devices described above.
Fig. 9 is a schematic diagram of a hardware structure of an electronic device implementing an embodiment of the present application.
The electronic device 900 includes, but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909, and a processor 910. Those skilled in the art will appreciate that the electronic device 900 may further include a power source (e.g., a battery) for supplying power to various components, and the power source may be logically connected to the processor 910 through a power management system, so as to manage charging, discharging, and power consumption management functions through the power management system. The electronic device structure shown in fig. 9 does not constitute a limitation of the electronic device, and the electronic device may include more or less components than those shown, or combine some components, or arrange different components, and thus, the description is not repeated here.
The processor 910 is configured to establish a nonlinear equation set of a speaker module based on a lumped parameter model and a voice coil vibration-related parameter, where the speaker module includes a speaker unit and a sound cavity, and the voice coil vibration-related parameter includes: relevant parameters of a magnetic circuit and a vibration component in the loudspeaker unit and coupling parameters between the loudspeaker unit and the sound cavity;
establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set;
acquiring a TS parameter and a first nonlinear parameter of the loudspeaker unit and a second nonlinear parameter of the sound cavity;
and inputting the TS parameters, the first nonlinear parameters and the second nonlinear parameters into the nonlinear distortion simulation model, and calculating a nonlinear distortion result of the loudspeaker module.
According to the electronic equipment provided by the embodiment of the application, a nonlinear equation set comprising a loudspeaker unit and an audio cavity loudspeaker module is established on the basis of a lumped parameter model and voice coil vibration related parameters; and establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set, wherein the established nonlinear distortion simulation model comprises the simulation of both the loudspeaker unit and the sound cavity. Obtaining TS parameters and first nonlinear parameters of a loudspeaker unit and second nonlinear parameters of a sound cavity; and inputting the TS parameter, the first nonlinear parameter and the second nonlinear parameter into a nonlinear distortion simulation model, calculating a nonlinear distortion result of the loudspeaker module, and comprehensively considering the influence of the loudspeaker unit and the sound cavity on the audio nonlinear distortion, so that the simulated nonlinear distortion result is more reliable.
Optionally, when the processor 910 obtains the TS parameter and the first nonlinear parameter of the speaker unit, it is specifically configured to:
testing the TS parameters of the loudspeaker unit through a Klippel LPM module; the first non-linearity parameter of the speaker unit is tested by a Klippel LSI module.
Optionally, when the processor 910 obtains the second non-linearity parameter of the sound cavity, it is specifically configured to: constructing a finite element simulation model of the nonlinear parameter of the sound cavity, wherein the finite element simulation model comprises the following steps: the front cavity channel, the sound inlet and the sound outlet are formed, and the first surface of the sound inlet is opposite to the voice coil vibrating diaphragm; attaching the first surface of the sound inlet to the voice coil diaphragm, and setting a piston radiation boundary condition at the sound outlet so as to simulate an outward radiation environment; adjusting the initial flow value of the inlet orifice for multiple times, and solving the nonlinear air resistance of the sound cavity at different flow velocities; and calculating the nonlinear air stiffness of the sound cavity based on the change of the equivalent area of the voice coil diaphragm along with the vibration displacement of the diaphragm and the physical equation of the adiabatic process.
Optionally, the processor 910 inputs the TS parameter, the first nonlinear parameter, and the second nonlinear parameter into the nonlinear distortion simulation model, and when a nonlinear distortion result of the speaker module is obtained, the processor is specifically configured to:
inputting the TS parameters, the first nonlinear parameters and the second nonlinear parameters into the nonlinear distortion simulation model;
inputting different frequency values into the nonlinear distortion simulation model respectively to obtain transient sound pressure of the audio frequency of the loudspeaker module radiating to a test point under different frequencies;
and calculating total harmonic distortion of the audio frequency of the loudspeaker module radiating to the test point under different frequencies according to the transient sound pressures.
Optionally, the processor 910 is specifically configured to, when calculating total harmonic distortion of the audio frequency of the speaker module radiating to the test point at different frequencies according to the transient sound pressures, respectively:
aiming at each transient sound pressure, obtaining each harmonic corresponding to the transient sound pressure through the fast Fourier transform of a time domain and a frequency domain;
and determining total harmonic distortion of the audio radiation of the loudspeaker module to the test point according to the subharmonics and the transient sound pressure.
It should be understood that, in the embodiment of the present application, the input Unit 904 may include a Graphics Processing Unit (GPU) 9041 and a microphone 9042, and the Graphics Processing Unit 9041 processes image data of a still picture or a video obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 907 includes a touch panel 9071 and other input devices 9072. A touch panel 9071 also referred to as a touch screen. The touch panel 9071 may include two parts, a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein. Memory 909 can be used to store software programs as well as various data including, but not limited to, application programs and operating systems. The processor 910 may integrate an application processor, which primarily handles operating systems, user interfaces, applications, etc., and a modem processor, which primarily handles wireless communications. It is to be appreciated that the modem processor described above may not be integrated into processor 910.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the embodiment of the speaker simulation method, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and so on.
The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement each process of the embodiment of the speaker simulation method, and can achieve the same technical effect, and is not described herein again to avoid repetition.
The embodiment of the application also provides a loudspeaker, and the loudspeaker is prepared according to the relevant parameters after the nonlinear distortion result is verified according to the steps in the embodiments of the loudspeaker simulation method.
It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-on-chip, system-on-chip or system-on-chip, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (13)

1. A method for loudspeaker emulation, the method comprising:
based on the lumped parameter model and the voice coil vibration related parameters, establishing a nonlinear equation system of the loudspeaker module, wherein the loudspeaker module comprises a loudspeaker unit and a voice cavity, and the voice coil vibration related parameters comprise: relevant parameters of a magnetic circuit and a vibration component in the loudspeaker unit and coupling parameters between the loudspeaker unit and the sound cavity;
establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set;
acquiring a TS parameter and a first nonlinear parameter of the loudspeaker unit and a second nonlinear parameter of the sound cavity;
and inputting the TS parameters, the first nonlinear parameters and the second nonlinear parameters into the nonlinear distortion simulation model, and calculating a nonlinear distortion result of the loudspeaker module.
2. The method of claim 1, wherein the step of obtaining the TS parameter and the first non-linearity parameter of the speaker unit comprises:
testing the TS parameters of the loudspeaker unit through a Klippel LPM module;
the first non-linearity parameter of the speaker unit is tested by a Klippel LSI module.
3. The method of claim 1, wherein the step of obtaining the second non-linearity parameter of the acoustic cavity comprises:
constructing a finite element simulation model of the nonlinear parameter of the sound cavity, wherein the finite element simulation model comprises the following steps: the front cavity channel, the sound inlet and the sound outlet are formed, and the first surface of the sound inlet is opposite to the voice coil vibrating diaphragm;
attaching the first surface of the sound inlet to the voice coil diaphragm, and setting a piston radiation boundary condition at the sound outlet so as to simulate an outward radiation environment;
adjusting the initial flow value of the inlet orifice for multiple times, and solving the nonlinear air resistance of the sound cavity at different flow velocities;
and calculating the nonlinear air stiffness of the sound cavity based on the change of the equivalent area of the voice coil diaphragm along with the vibration displacement of the diaphragm and the physical equation of the adiabatic process.
4. The method of claim 1, wherein the step of inputting the TS parameter, the first nonlinear parameter, and the second nonlinear parameter into the nonlinear distortion simulation model to obtain a nonlinear distortion result of the speaker module comprises:
inputting the TS parameters, the first nonlinear parameters and the second nonlinear parameters into the nonlinear distortion simulation model;
inputting different frequency values into the nonlinear distortion simulation model respectively to obtain transient sound pressure of the audio frequency of the loudspeaker module radiating to a test point under different frequencies;
and calculating total harmonic distortion of the audio frequency of the loudspeaker module radiating to the test point under different frequencies according to the transient sound pressures.
5. The method of claim 4, wherein the step of calculating the total harmonic distortion of the speaker module audio radiated to the test point at different frequencies according to each of the transient sound pressures comprises:
aiming at each transient sound pressure, obtaining each harmonic corresponding to the transient sound pressure through the fast Fourier transform of a time domain and a frequency domain;
and determining total harmonic distortion of the audio radiation of the loudspeaker module to the test point according to the subharmonics and the transient sound pressure.
6. A loudspeaker emulation apparatus, the apparatus comprising:
the first establishing module is used for establishing a nonlinear equation set of the loudspeaker module based on the lumped parameter model and the voice coil vibration related parameters, wherein the loudspeaker module comprises a loudspeaker unit and a voice cavity, and the voice coil vibration related parameters comprise: relevant parameters of a magnetic circuit and a vibration component in the loudspeaker unit and coupling parameters between the loudspeaker unit and the sound cavity;
the second establishing module is used for establishing a nonlinear distortion simulation model of the loudspeaker module according to the nonlinear equation set;
the parameter acquisition module is used for acquiring a TS parameter and a first nonlinear parameter of the loudspeaker unit and a second nonlinear parameter of the sound cavity;
and the calculation module is used for inputting the TS parameters, the first nonlinear parameters and the second nonlinear parameters into the nonlinear distortion simulation model and calculating a nonlinear distortion result of the loudspeaker module.
7. The apparatus of claim 6, wherein the parameter obtaining module comprises:
a first sub-module for testing TS parameters of the speaker unit by a Klippel LPM module;
a second sub-module for testing a first non-linearity parameter of the speaker unit by the KlippelLSI module.
8. The apparatus of claim 6, wherein the parameter obtaining module comprises:
the construction submodule is used for constructing a sound cavity nonlinear parameter finite element simulation model, wherein the finite element simulation model comprises: the front cavity channel, the sound inlet and the sound outlet are formed, and the first surface of the sound inlet is opposite to the voice coil vibrating diaphragm;
the simulation submodule is used for attaching the first surface of the sound inlet to the voice coil vibrating diaphragm and setting a piston radiation boundary condition at the sound outlet so as to simulate an outward radiation environment;
the adjusting submodule is used for adjusting the initial flow value of the inlet orifice for multiple times and solving the nonlinear air resistance of the sound cavity at different flow speeds;
and the first calculation submodule is used for calculating the nonlinear air stiffness of the sound cavity based on the change of the equivalent area of the voice coil diaphragm along with the vibration displacement of the diaphragm and a physical equation of the adiabatic process.
9. The apparatus of claim 6, wherein the computing module comprises:
the first input submodule is used for inputting the TS parameter, the first nonlinear parameter and the second nonlinear parameter into the nonlinear distortion simulation model;
the second input submodule is used for inputting different frequency values into the nonlinear distortion simulation model respectively to obtain transient sound pressure of the audio frequency of the loudspeaker module radiating to a test point under different frequencies;
and the second calculation submodule is used for calculating the total harmonic distortion of the audio frequency of the loudspeaker module radiating to the test point under different frequencies according to the transient sound pressures.
10. The apparatus of claim 9, wherein the second computation submodule comprises:
the transformation unit is used for obtaining each harmonic corresponding to the transient sound pressure through the fast Fourier transform of a time domain and a frequency domain aiming at each transient sound pressure;
and the determining unit is used for determining total harmonic distortion of the audio radiation of the loudspeaker module to the test point according to the subharmonics and the transient sound pressure.
11. An electronic device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, which program or instructions, when executed by the processor, implement the steps of the loudspeaker emulation method of any of claims 1-5.
12. A loudspeaker prepared according to the relevant parameters after verifying the nonlinear distortion results according to the steps in the loudspeaker simulation method as claimed in any one of claims 1 to 5.
13. A readable storage medium, on which a program or instructions are stored, which program or instructions, when executed by a processor, carry out the steps of the loudspeaker simulation method according to any one of claims 1-5.
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