WO2021248527A1

WO2021248527A1 - Non-linear compensation method, system and device for loudspeaker and storage medium

Info

Publication number: WO2021248527A1
Application number: PCT/CN2020/096693
Authority: WO
Inventors: 黄远芳; 蓝睿智; 叶利剑
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-06-12
Filing date: 2020-06-18
Publication date: 2021-12-16
Also published as: CN111741408A

Abstract

Disclosed in the embodiments of the present invention is a nonlinear compensation method for a loudspeaker, comprising: obtaining the terminal voltage of a loudspeaker at the moment previous to a current moment; obtaining a state variable of the loudspeaker at the current moment according to the terminal voltage; obtaining a signal to be processed, modifying original linear parameters of the loudspeaker, and performing linear processing on the signal according to the modified linear parameters to obtain a linearly processed signal; and performing non-linear processing on the linearly processed signal according to nonlinear parameters of the loudspeaker and the state variable at the current moment to obtain a non-linear signal, and outputting the non-linear signal to the loudspeaker. Further disclosed are a nonlinear compensation system and device for a loudspeaker and a storage medium, which may effectively improve the output sound quality of the loudspeaker and prolong the service life of the loudspeaker.

Description

Non-linear compensation method, system, equipment and storage medium of loudspeaker

Technical field

The present invention relates to the technical field of loudspeakers, and in particular to a method, system, equipment and storage medium for nonlinear compensation of loudspeakers.

Background technique

The inherent nonlinearity of the loudspeaker causes the fundamental frequency of the loudspeaker to be compressed under large signals. This nonlinearity is usually related to the physical limitations of the loudspeaker and the characteristics of the materials used. Among them, the nonlinearity of the mechanical resistance plays a major role in the compression of the fundamental frequency at the resonance frequency, and the nonlinearity of the force factor and the stiffness of the mechanical suspension not only causes the fundamental frequency compression below the resonance frequency, but also produces a displacement DC. In addition, the nonlinearity of the force factor and mechanical suspension stiffness determines the total harmonic distortion of the resonance frequency, and the nonlinearity of the force factor and mechanical suspension stiffness is the main source of the total harmonic distortion of the loudspeaker at low frequencies.

In the application of loudspeaker nonlinear compensation, the nonlinear distortion is compensated while the nonlinear compression is also released. At this time, the displacement amplitude of the loudspeaker under a large signal will exceed the physical limit of the actual loudspeaker, especially at the resonance frequency. Abnormal sounds such as bottoming can even cause permanent damage.

Application content

Based on this, it is necessary to propose a method, system, equipment and storage medium for nonlinear compensation of loudspeakers in response to the above-mentioned problems.

A method for nonlinear compensation of a loudspeaker includes: obtaining the terminal voltage of the loudspeaker at a moment before the current moment; obtaining the state variable of the loudspeaker at the present moment according to the terminal voltage; obtaining a signal to be processed, and modifying the original linearity of the loudspeaker Parameters: perform linear processing on the signal to be processed according to the modified linear parameters to obtain a linear processing signal; perform nonlinear processing on the linear processing signal according to the nonlinear parameters of the loudspeaker and the state variable at the current moment to obtain Non-linear signal, outputting the non-linear signal to the speaker.

A nonlinear compensation system for a loudspeaker, including: a delay module, used to obtain the terminal voltage of the speaker at the previous moment; a state estimation module, used to obtain the state variable of the loudspeaker at the current moment according to the terminal voltage; linear filtering The module is used to obtain the signal to be processed, modify the original linear parameters of the speaker, and perform linear processing on the signal to be processed according to the modified linear parameters to obtain the linearly processed signal; the nonlinear filtering module is used to The non-linear parameter and the state variable at the current moment perform non-linear processing on the linearly processed signal, obtain a non-linear signal, and output the non-linear signal to the speaker.

A non-linear compensation device of Yangshengqi includes: a processor and a memory, the processor is coupled to the memory, the memory is stored with a computer program, and the processor executes the computer program to realize the above The method described.

A storage medium that stores a computer program, and the computer program can be executed by a processor to implement the method described above.

The embodiments of the present invention have the following beneficial effects:

By obtaining the state variables of the speaker at the current time according to the terminal voltage of the speaker at the previous time, modify the original linear parameters of the speaker, perform linear processing on the signal to be processed according to the modified linear parameters, and obtain the linear processed signal according to the non-linear parameters of the speaker Perform nonlinear processing on the linear processing signal with the current state variables, output the acquired nonlinear signal to the loudspeaker, and modify the linear response of the loudspeaker by modifying the linear parameters while performing nonlinear compensation, which can prevent part of the loudspeaker during nonlinear compensation. When the compensation voltage near the resonance frequency is too large, the output sound quality of the speaker is effectively improved and the service life of the speaker is prolonged.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

in:

FIG. 1 is a schematic flowchart of a first embodiment of a method for non-linear compensation of a loudspeaker provided by the present invention;

2 is a schematic flowchart of a second embodiment of a method for non-linear compensation of a loudspeaker provided by the present invention;

FIG. 3 is a schematic diagram of the effect of compression processing in the nonlinear compensation method of the loudspeaker provided by the present invention;

4 is a schematic flowchart of a third embodiment of a method for non-linear compensation of a loudspeaker provided by the present invention;

Fig. 5 is a schematic diagram of the variation of the stiffness coefficient variation coefficient with displacement provided by the present invention;

Fig. 6 is a schematic structural diagram of an embodiment of a speaker nonlinear compensation system provided by the present invention

Fig. 7 is a schematic structural diagram of an embodiment of a speaker nonlinear compensation device provided by the present application

FIG. 8 is a schematic structural diagram of an embodiment of a storage medium provided by the present application.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The inherent nonlinearity of the loudspeaker causes the fundamental frequency compression of the loudspeaker under a large signal. In the application of loudspeaker nonlinear compensation, the nonlinear distortion is compensated while the nonlinear compression is also released. At this time, the loudspeaker is The displacement amplitude will exceed the physical limit of the actual speaker, abnormal sounds such as bottoming will appear, and even permanent damage will occur.

In order to solve the above-mentioned problems, the present invention provides a nonlinear compensation method of a loudspeaker, which can effectively improve the output sound quality of the loudspeaker and prolong the service life of the loudspeaker.

Please refer to Fig. 1. Fig. 1 is a schematic flowchart of a first embodiment of a method for non-linear compensation of a loudspeaker provided by the present invention. The non-linear compensation method of loudspeaker provided by the present invention includes the following steps:

S101: Acquire the terminal voltage of the speaker at the previous moment at the current moment, and acquire the state variable of the speaker at the current moment according to the terminal voltage.

In a specific implementation scenario, the terminal voltage at the moment before the current moment of the speaker is obtained. For example, a voltage sensor can be configured, and the terminal voltage at both ends of the speaker can be obtained through the voltage sensor. Obtain the current state variable of the speaker according to the terminal voltage. The state variables at the current moment include the displacement, speed and current of the speaker, etc. The speaker state variables at the current moment can be obtained according to the linear parameters and non-linear parameters of the speaker at the current moment. Specifically, the displacement, speed and current of the speaker can be obtained according to the following formula:

x(n)=σ _x u _e (n)-a ₁ x(n-1)-a ₂ x(n-2)

(n) = 0.8038f _s ((n)-x(n-2))-0.5358v(n-1)-0.0718v(n-2)

Bl(x) can be calculated according to the following formula:

It can be calculated according to the following formula:

a ₁ , a ₂ and σ _x can be calculated according to the following formulas:

ω _z can be calculated according to the following formula:

ω _z =ω ₀ /f _s

ζ can be calculated according to the following formula:

K _ms (x) can be calculated according to the following formula:

R _ms (v) can be calculated according to the following formula:

Among them, x(n) is the displacement of the loudspeaker, v(n) is the speed of the loudspeaker, and i(n) is the current of the loudspeaker. voltage u _e speaker, R _e is the resistance of the speaker, L _e is the inductance of the speaker, f _s is the sampling frequency, bl ₀ of the force factor of the loudspeaker, k ₀ is the stiffness coefficient of the speaker, r ₀ is the damping coefficient of the speaker , Bl(x) is the total force factor of the loudspeaker, K _ms (x) is the total stiffness coefficient of the loudspeaker, and R _ms (v) is the total damping coefficient of the loudspeaker.

The state variable method is also suitable for scenarios where the speaker parameters are updated or not updated in real time. The nonlinear system at this time is regarded as a linear system whose parameters change in real time, and the real-time state of x, v, i can be obtained _{by real-time calculation of a 1} , a ₂ , σ _{x and other parameters.} This state variable calculation method avoids the calculation of intermediate variables (force) while considering parameter changes, and changes from voltage-force-displacement state conversion to direct voltage-displacement conversion. In addition, a ₁ , a ₂ , and σ _x can be directly used in the feedforward displacement protection algorithm, and the multiplexing of intermediate variables can greatly reduce the calculation amount and memory consumption of the DSP.

S102: Obtain a signal to be processed, modify the original linear parameter of the speaker, perform linear processing on the signal to be processed according to the modified linear parameter, and acquire the linear processed signal.

In this implementation scenario, the signal to be processed may be the original input signal or a signal obtained after compressing the original input signal. Performing linear processing on the signal to be processed according to the linear parameters of the loudspeaker can make the loudspeaker exhibit a desired loudspeaker response. Linear loudspeaker parameters includes a resistor R _e, the inductance L _e, power factor bl _0, mass m _t, stiffness coefficient k _0, the damping coefficient r _0.

In the application of speaker nonlinear compensation, the compensation voltage of some speakers near the resonance frequency is too large, which not only cannot reduce the distortion, but also may cause the distortion after compensation to be greater than the distortion before compensation. Since the linear parameters of the loudspeaker determine the response of the linear filter, the linear behavior of the loudspeaker can be modified by modifying the linear parameters, thereby achieving the function of controlling the compensation signal voltage.

S103: Perform nonlinear processing on the linear processing signal according to the nonlinear parameter of the speaker and the state variable at the current moment, obtain the nonlinear signal, and output the nonlinear signal to the speaker.

In this implementation scenario, performing nonlinear processing on the linearly processed signal according to the nonlinear parameters of the loudspeaker can eliminate the nonlinear behavior of the loudspeaker, thereby reducing the distortion of the loudspeaker. The nonlinear parameters of the loudspeaker include the total force factor Bl (x), the total stiffness coefficient K _ms (x), and the total damping coefficient R _ms (v).

In this implementation scenario, a nonlinear model of the loudspeaker is established:

Wherein, u _e is the voltage of the speaker, R _e is the resistance of the speaker, L _e is the inductance of the speaker, Bl (x) is the total force factor of the loudspeaker, K _ms (x) is the total stiffness coefficient of the speaker, R _ms (v ) Is the total damping coefficient of the speaker.

According to the nonlinear model of the loudspeaker, the linear processing signal is inversely filtered to obtain the nonlinear signal, and the nonlinear signal is input to the loudspeaker.

It can be seen from the above description that in this embodiment, the state variables of the speaker at the current time are obtained according to the terminal voltage of the speaker at the current time and the previous time, the original linear parameters of the speaker are modified, and the signal to be processed is linearly processed according to the modified linear parameters to obtain Linear processing signal, according to the nonlinear parameters of the loudspeaker and the current state variables to perform nonlinear processing on the linear processing signal, output the obtained nonlinear signal to the loudspeaker, and modify the linearity of the loudspeaker by modifying the linear parameters while performing nonlinear compensation The response can prevent excessive compensation voltage of some speakers near the resonance frequency during nonlinear compensation, effectively improve the output sound quality of the speaker, and prolong the service life of the speaker.

Please refer to FIG. 2. FIG. 2 is a schematic flowchart of a second embodiment of a method for non-linear compensation of a loudspeaker provided by the present invention. The non-linear compensation method of loudspeaker provided by the present invention includes the following steps:

S201: Obtain an original input signal, obtain a predicted terminal signal of the speaker, perform compression processing on the original input signal according to the predicted terminal signal, and obtain a signal to be processed.

In a specific implementation scenario, the original input signal is obtained, according to the linear parameters of the speaker, including voice coil vibration equivalent mass mt, voice coil DC resistance Re, voice coil force factor linear term b0, stiffness coefficient linear term k0 and non-linearity The linear parameter factor Bl(x), stiffness coefficient kt(x) and force resistance Rm(v) are calculated to obtain the predicted terminal signal of the loudspeaker. According to the predicted terminal signal and the preset maximum displacement of the loudspeaker, the coefficient for compression processing is judged, According to the coefficient, the original input signal is compressed.

In this implementation scenario, after the original input signal is compressed, the obtained signal is smoothed to avoid signal distortion due to compression. Furthermore, the original input signal gain and the smoothed signal gain are obtained according to two The signal gain gap adjusts the gain of the smoothed signal to further improve the signal quality. In this implementation scenario, the original input signal is compressed, smoothed, and adjusted according to the speaker's response time, release time, voltage threshold, and inflection point width. Please refer to FIG. 3 in combination. FIG. 3 is a schematic diagram of the effect of compression processing in the nonlinear compensation method of the loudspeaker provided by the present invention. Among them, u _T is the voltage threshold of the loudspeaker, and u _w is the width of the inflection point. u _x (t) is the original input signal, u _y (t) is the signal to be processed.

S202: Acquire the terminal voltage of the speaker at the previous moment at the current moment, and acquire the state variable of the speaker at the current moment according to the terminal voltage.

In this implementation scenario, step S202 is basically the same as step S101 in the first embodiment of the speaker nonlinear compensation method provided by the present invention, and will not be repeated here.

S203: Increase the damping coefficient of the loudspeaker to reduce the mechanical quality factor of the loudspeaker.

In this implementation scenario, the speaker damping coefficient r _{0 is} increased, and the mechanical quality factor Q _ms can be calculated according to the following formula:

Among them, K _ms (x) is the total stiffness coefficient _{of the loudspeaker, and m t} is the quality of the loudspeaker.

When the other parameters of the loudspeaker remain unchanged, the damping coefficient r _{0 of the} loudspeaker increases, and the mechanical quality factor Q _ms decreases, so that the sound pressure output of the loudspeaker decreases. Under the loudspeaker parameters of this embodiment, the Q _ms value decreases by 5%, and the output loudspeaker The sound pressure level is reduced by 0.5dB.

S204: Perform non-linear processing on the linear processing signal according to the non-linear parameters of the speaker and the state variable at the current moment to obtain the non-linear signal, and output the non-linear signal to the speaker.

In this implementation scenario, step S204 is basically the same as step S103 in the first embodiment of the speaker nonlinear compensation method provided by the present invention, and will not be repeated here.

According to the above description, in this embodiment, the damping coefficient of the speaker is increased to reduce the mechanical quality factor of the speaker, so that the sound pressure output of the speaker is reduced, which can effectively avoid the problem of excessive compensation voltage of the speaker near the resonance frequency. The signal is compressed to further ensure that the compensation voltage will not be too large, which effectively improves the output sound quality of the speaker and prolongs the service life of the speaker.

Please refer to FIG. 4, which is a schematic flowchart of a third embodiment of a method for non-linear compensation of a loudspeaker provided by the present invention. The non-linear compensation method of loudspeaker provided by the present invention includes the following steps:

S301: Acquire the terminal voltage of the speaker at the previous moment at the current moment, and acquire the state variable of the speaker at the current moment according to the terminal voltage.

In this implementation scenario, step S301 is basically the same as step S101 in the first embodiment of the speaker nonlinear compensation method provided by the present invention, and will not be repeated here.

S302: Modify the stiffness coefficient of the speaker.

In the present embodiment the scene, by adjusting the stiffness coefficient k to modify the resonance frequency to attenuate the displacement output of the speaker _0, may coefficient [lambda] _k by modifying the stiffness coefficient change by _k _₀ = λ k k _0, to achieve the stiffness coefficient k is adjusted to _zero.

According to the response time and release time of the loudspeaker, peak detection and smoothing of the displacement of the loudspeaker are carried out to obtain the displacement of the pre-processed signal. Obtain the preprocessing signal displacement according to the following formula:

x(t)=max(γx(t-1)+(1-γ)|x(t)|, |x(t)|)

x _out (t)=αx _out (t-1)+(1-α)x(t)

Among them, τ _α is the response time of the speaker (attack time), and τ _γ is the release time of the speaker (release time). f _s is the sampling rate, x(t) is the displacement of the loudspeaker, and x _out (t) is the displacement of the preprocessed signal.

The coefficient of change of stiffness coefficient λ _k can be obtained according to the following formula:

Among them, λ _k is the stiffness coefficient change coefficient, σ _k is the elastic coefficient change rate, B _k determines the initial value of _{λ k} _{, when B k} =1 and A _k =0, then λ _kms =1, and the elastic coefficient k _{0 is} not variable, x _T is the spring constant curve over a displacement associated with, the speaker may be adjusted such that the displacement x _T is not smaller than the specified compression displacement x _T is usually set to two-thirds of the maximum displacement of the speaker.

Please refer to FIG. 5 in combination. FIG. 5 is a schematic diagram of the variation of the stiffness coefficient variation coefficient with the displacement provided by the present invention.

By adjusting the stiffness coefficient k ₀ , the degree of displacement compression can be controlled, thereby achieving the effect of reducing the compensation voltage.

S303: Perform non-linear processing on the linear processing signal according to the non-linear parameters of the speaker and the state variable at the current moment, to obtain the non-linear signal, and output the non-linear signal to the speaker.

In this implementation scenario, step S303 is basically the same as step S103 in the first embodiment of the speaker nonlinear compensation method provided by the present invention, and will not be repeated here.

S304: Perform compression processing on the nonlinear signal, obtain the compressed signal, and output the compressed signal to the speaker.

In this implementation scenario, the nonlinear signal is compressed to obtain the compressed signal, which further prevents the speaker from being damaged due to excessive compensation voltage. The specific compression processing steps are basically similar to the steps of performing compression processing on the original input signal in step S201 of the second embodiment of the speaker nonlinear compensation method provided by the present invention, replacing u _x (t) with a nonlinear signal, Replace u _y (t) with the compressed signal.

It can be seen from the above description that in this embodiment, the stiffness coefficient of the speaker is modified to control the displacement compression degree of the speaker, thereby achieving the effect of reducing the compensation voltage, and compressing the nonlinear signal to further prevent the speaker from being damaged due to excessive compensation voltage. Effectively improve the output sound quality of the speaker and prolong the service life of the speaker.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of an embodiment of a nonlinear compensation system for a loudspeaker provided by the present invention. The speaker nonlinear compensation system 10 provided by the present invention includes: a delay module 11, a state estimation module 12, a linear filter module 13, and a nonlinear filter module 14.

The delay module 11 is used to obtain the terminal voltage of the speaker at a time before the current time. The state estimation module 12 is used to obtain the state variables of the speaker at the current moment according to the terminal voltage. The linear filter module 13 is used to obtain the signal to be processed, modify the original linear parameters of the loudspeaker, and perform linear processing on the signal to be processed according to the modified linear parameters to obtain the linear processed signal. The non-linear filtering module 14 is used to perform non-linear processing on the linear processing signal according to the non-linear parameters of the speaker and the state variable at the current moment, obtain the non-linear signal, and output the non-linear signal to the speaker.

Wherein, the linear parameter of the speaker includes at least one of resistance, inductance, force factor, mass, stiffness coefficient, and damping coefficient. The nonlinear parameters of the loudspeaker include at least one of the total force factor, the total stiffness coefficient, and the total damping coefficient. The state variables at the current moment include at least one of the displacement, speed, and current of the speaker.

The linear filter module 13 is also used to increase the damping coefficient of the loudspeaker to reduce the mechanical quality factor of the loudspeaker.

The linear filter module 13 is also used to modify the stiffness coefficient of the speaker.

The linear filter module 13 is also used to obtain the response time, release time, elastic coefficient change rate and the displacement corresponding to the transition zone of the elastic coefficient change curve of the loudspeaker, according to the response time, release time, elastic coefficient change rate and the transition zone corresponding to the elastic coefficient change curve The displacement modifies the stiffness coefficient of the speaker.

The nonlinear compensation system 10 further includes a first limiting module 15 for performing compression processing on the nonlinear signal, obtaining the compressed signal, and outputting the compressed signal to the loudspeaker. The nonlinear compensation system 10 also includes a second limiting module 16 configured to obtain the original input signal, obtain the predicted terminal signal of the loudspeaker, and perform compression processing on the original input signal according to the predicted terminal signal to obtain the signal to be processed.

The first restriction module 15 and the second restriction module 16 are used to obtain the response time, release time, voltage threshold and inflection point width of the speaker, and perform compression processing according to the response time, release time, voltage threshold and inflection point width.

According to the above description, the nonlinear compensation system of the loudspeaker in this embodiment modifies the original linear parameters of the loudspeaker, performs linear processing on the signal to be processed according to the modified linear parameters, and obtains the linearly processed signal according to the nonlinear parameters of the loudspeaker and the current time. The state variable of the linear processing signal is nonlinearly processed, and the acquired nonlinear signal is output to the loudspeaker. The linear response of the loudspeaker can be modified by modifying the linear parameters while the nonlinear compensation is performed, which can prevent some loudspeakers from resonant frequency during nonlinear compensation The nearby compensation voltage is too large, which effectively improves the output sound quality of the speaker and prolongs the service life of the speaker.

Please refer to FIG. 7. FIG. 7 is a schematic structural diagram of an embodiment of a speaker nonlinear compensation device provided by the present application. The nonlinear compensation 20 of the loudspeaker includes a processor 21 and a memory 22. The processor 21 is coupled to the memory 22. A computer program is stored in the memory 22, and the processor 21 executes the computer program when working to implement the methods shown in FIGS. 1, 2 and 4. The detailed method can be referred to the above, and will not be repeated here.

It can be seen from the above description that the nonlinear compensation device of the loudspeaker in this embodiment modifies the original linear parameters of the loudspeaker, performs linear processing on the signal to be processed according to the modified linear parameters, and obtains the linearly processed signal according to the nonlinear parameters of the loudspeaker and the current time. The state variable of the linear processing signal is nonlinearly processed, and the acquired nonlinear signal is output to the loudspeaker. The linear response of the loudspeaker can be modified by modifying the linear parameters while the nonlinear compensation is performed, which can prevent some loudspeakers from resonant frequency during nonlinear compensation The nearby compensation voltage is too large, which effectively improves the output sound quality of the speaker and prolongs the service life of the speaker.

Please refer to FIG. 8. FIG. 8 is a schematic structural diagram of an embodiment of a storage medium provided by the present application. At least one computer program 31 is stored in the storage medium 30, and the computer program 31 is used to be executed by the processor to implement the methods shown in FIGS. In an embodiment, the storage medium 30 may be a storage chip in a terminal, a hard disk, or a mobile hard disk, a USB flash drive, an optical disk, or other tools for writing storage, or a server or the like.

It can be seen from the above description that the computer program in the storage medium in this embodiment can be used to modify the original linear parameters of the loudspeaker, perform linear processing on the signal to be processed according to the modified linear parameters, and obtain the linear processed signal according to the nonlinear parameters of the loudspeaker and The current state variables perform nonlinear processing on the linear processing signal, output the acquired nonlinear signal to the speaker, and modify the linear response of the speaker by modifying the linear parameters while performing nonlinear compensation, which can prevent some speakers from being If the compensation voltage near the resonance frequency is too large, the output sound quality of the speaker is effectively improved and the service life of the speaker is prolonged.

Different from the prior art, the present invention modifies the original linear parameters of the loudspeaker to modify the linear behavior of the loudspeaker, thereby achieving the function of controlling the compensation signal voltage. The original input signal and/or the nonlinear signal are compressed to further prevent the loudspeaker from being caused by excessive compensation voltage. Damage, effectively improve the output sound quality of the speaker and prolong the service life of the speaker.

The above-disclosed are only preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

A method for non-linear compensation of loudspeaker, which is characterized in that it comprises:

Obtain the terminal voltage of the speaker at the moment before the current moment;

Acquiring the current state variable of the speaker according to the terminal voltage;

Acquiring a signal to be processed, modifying the original linear parameter of the speaker, performing linear processing on the signal to be processed according to the linear parameter after the modification, to obtain a linear processing signal;

Perform non-linear processing on the linear processing signal according to the non-linear parameter of the speaker and the state variable at the current moment to obtain a non-linear signal, and output the non-linear signal to the speaker.
The nonlinear compensation method of a loudspeaker according to claim 1, wherein the linear parameters of the loudspeaker include at least one of resistance, inductance, force factor, mass, stiffness coefficient, and damping coefficient;

The nonlinear parameters of the loudspeaker include at least one of a total force factor, a total stiffness coefficient, and a total damping coefficient;

The state variable at the current moment includes at least one of the displacement, speed, and current of the speaker.
The nonlinear compensation method of the loudspeaker according to claim 1, wherein the step of modifying the original linear parameters of the loudspeaker comprises:

Increase the damping coefficient of the speaker to reduce the mechanical quality factor of the speaker; or

Modify the stiffness coefficient of the speaker.
The nonlinear compensation method of the loudspeaker according to claim 3, wherein the step of modifying the stiffness coefficient of the loudspeaker comprises:

Obtain the response time, release time, elastic coefficient change rate, and the displacement corresponding to the transition zone of the elastic coefficient change curve of the speaker, according to the response time, the release time, the elastic coefficient change rate and the elastic coefficient change curve The displacement corresponding to the transition zone modifies the stiffness coefficient of the speaker.
The nonlinear compensation method of the loudspeaker according to claim 1, wherein the step of outputting the nonlinear signal to the loudspeaker comprises:

Compression processing is performed on the non-linear signal, a compressed signal is obtained, and the compressed signal is output to the speaker.
The nonlinear compensation method of the loudspeaker according to claim 1, wherein the step of outputting the nonlinear signal to the loudspeaker comprises:

The step of acquiring the signal to be processed includes:

Obtain an original input signal, obtain a predicted terminal signal of the speaker, perform compression processing on the original input signal according to the predicted terminal signal, and obtain the signal to be processed.
The speaker nonlinear compensation method according to claim 5 or 6, wherein the step of performing compression processing comprises:

Obtain the response time, release time, voltage threshold, and inflection point width of the speaker, and perform compression processing according to the response time, release time, voltage threshold, and inflection point width.
A nonlinear compensation system for loudspeakers, which is characterized in that it comprises:

The delay module is used to obtain the terminal voltage of the speaker at the moment before the current moment;

The state estimation module is configured to obtain the state variable of the speaker at the current moment according to the terminal voltage;

A linear filter module, configured to obtain a signal to be processed, modify the original linear parameter of the speaker, perform linear processing on the signal to be processed according to the linear parameter after the modification, to obtain a linear processed signal;

The non-linear filtering module is used to perform non-linear processing on the linear processing signal according to the non-linear parameters of the speaker and the state variable at the current moment, to obtain a non-linear signal, and to output the non-linear signal to the speaker.
A non-linear compensation device for a sounder, characterized by comprising: a processor and a memory, the processor is coupled to the memory, the memory is stored with a computer program, and the processor executes the computer program to Implement the method according to any one of claims 1-7.
A storage medium, characterized by storing a computer program, which can be executed by a processor to implement the method according to any one of claims 1-7.