CN111741409A - Method for compensating for non-linearity of speaker, speaker apparatus, device, and storage medium - Google Patents

Method for compensating for non-linearity of speaker, speaker apparatus, device, and storage medium Download PDF

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CN111741409A
CN111741409A CN202010537957.5A CN202010537957A CN111741409A CN 111741409 A CN111741409 A CN 111741409A CN 202010537957 A CN202010537957 A CN 202010537957A CN 111741409 A CN111741409 A CN 111741409A
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loudspeaker
signal
power amplifier
parameter
speaker
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黄远芳
蓝睿智
吴锐兴
叶利剑
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AAC Technologies Pte 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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2203/00—Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups

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  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

The embodiment of the invention discloses a nonlinear compensation method of a loudspeaker, which is applied to loudspeaker equipment comprising an intelligent power amplifier, and comprises the following steps: performing displacement compression filtering processing on an original input signal at the current moment to generate a processed input signal; obtaining a loudspeaker state variable and a loudspeaker system parameter at the current moment, and calculating a predistortion signal corresponding to the processed input signal according to the loudspeaker state variable and the loudspeaker system parameter; acquiring system response parameters and frequency domain response parameters of the intelligent power amplifier, and calculating compensation signals corresponding to the pre-distortion signals according to the system response parameters and the frequency domain response parameters; and inputting the compensation signal into an intelligent power amplifier to obtain a playing signal, and inputting the playing signal into a loudspeaker. The invention also provides a speaker device, an apparatus and a storage medium. The invention can carry out nonlinear compensation on the loudspeaker equipment comprising the intelligent power amplifier and improve the playing tone quality of the loudspeaker.

Description

Method for compensating for non-linearity of speaker, speaker apparatus, device, and storage medium
Technical Field
The invention relates to the technical field of intelligent power amplification, in particular to a nonlinear compensation method of a loudspeaker, loudspeaker equipment, a device and a storage medium.
Background
The rapid development and popularization of portable intelligent terminal equipment, and multimedia applications such as video entertainment and the like are receiving more and more attention. Good sound playback is an important part of the user experience of multimedia applications. The wide use of the large-amplitude miniature loudspeaker and the intelligent power amplifier greatly improves the sound reproduction effect of the portable intelligent terminal. However, due to the size limitation of the micro-speaker, its nonlinear distortion is very significant at large amplitudes. Non-linear compensation is required for large amplitude micro-speakers. General nonlinear compensation is only suitable for fixed power amplification, and intelligent power amplification can cause the nonlinear compensation effect to be poor or even completely fail due to the existence of loudspeaker protection (such as amplitude protection and temperature protection), circuit boosting and other processing.
Disclosure of Invention
In view of the above, it is necessary to propose a nonlinear compensation method of a speaker, a speaker device, an apparatus, and a storage medium in view of the above-mentioned problems.
A nonlinear compensation method of a loudspeaker is applied to loudspeaker equipment comprising a smart power amplifier, and comprises the following steps: performing attenuation processing on an original input signal at the current moment to generate a processed input signal; obtaining a loudspeaker state parameter and a loudspeaker system parameter at the current moment, and calculating a predistortion signal corresponding to the processing input signal according to the loudspeaker state parameter and the loudspeaker system parameter; acquiring system response parameters and frequency domain response parameters of the intelligent power amplifier, and filtering the pre-distortion signal according to the system response parameters to acquire a compensation signal; and inputting the compensation signal into the intelligent power amplifier to obtain a playing signal, and inputting the playing signal into a loudspeaker.
A speaker apparatus for a speaker device including a smart power amplifier, comprising: the offset processing module is used for carrying out attenuation processing on the original input signal at the current moment to generate a processed input signal; the nonlinear module is used for acquiring the loudspeaker state parameter and the loudspeaker system parameter at the current moment, and calculating a predistortion signal corresponding to the processing input signal according to the loudspeaker state parameter and the loudspeaker system parameter; the power amplifier equalization module is used for acquiring a system response parameter and a frequency domain response parameter of the intelligent power amplifier, and filtering the predistortion signal according to the system response parameter to acquire a compensation signal; and the intelligent power amplifier module is used for inputting the compensation signal into the intelligent power amplifier, acquiring a playing signal and inputting the playing signal into a loudspeaker.
A speaker apparatus, comprising: a processor coupled to the memory and a memory having a computer program stored therein, the processor executing the computer program to implement the method as described above.
A readable storage medium storing a computer program executable by a processor to implement the method as described above.
The embodiment of the invention has the following beneficial effects:
the method comprises the steps of obtaining a processed input signal by attenuating an original input signal, calculating a state parameter of a loudspeaker at the current moment according to the original input signal and an accepted feedback signal, calculating nonlinear distortion of the loudspeaker according to the current state parameter of the loudspeaker, generating a corresponding predistortion signal, carrying out frequency response equalization on the predistortion signal, compensating the frequency response distortion of an intelligent power amplifier, carrying out nonlinear compensation on loudspeaker equipment comprising the intelligent power amplifier, and improving the playing tone quality of the loudspeaker.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
fig. 1 is a schematic flow chart of a first embodiment of a non-linearity compensation method for a loudspeaker provided by the present invention;
FIG. 2a is a schematic diagram of a waveform of a system response of the smart power amplifier provided by the present invention;
fig. 2b is a waveform diagram of the inverse system response of the smart power amplifier provided by the present invention.
Fig. 3 is a schematic flow chart of a non-linearity compensation method for a loudspeaker according to a second embodiment of the present invention;
FIG. 4a is a schematic diagram of an SPL (Sound Pressure Level) waveform using the method of the present embodiment;
FIG. 4b is a schematic representation of a THD (Total Harmonic Distortion) waveform using the method of the present embodiment;
fig. 5 is a schematic structural diagram of an embodiment of a speaker apparatus provided in the present invention;
fig. 6 is a schematic structural diagram of an embodiment of a speaker apparatus provided by the present invention;
FIG. 7 is a schematic structural diagram of an embodiment of a storage medium provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Due to the size limitation of the micro-speaker, the nonlinear distortion is very significant at large amplitudes. Non-linear compensation is required for large amplitude micro-speakers. General nonlinear compensation is only suitable for fixed power amplification, and intelligent power amplification can cause the nonlinear compensation effect to be poor or even completely fail due to the existence of loudspeaker protection (such as amplitude protection and temperature protection), voltage Boost and the like.
In order to solve the above problems, the present invention provides a nonlinear compensation method for a speaker, which can perform nonlinear compensation on speaker devices including an intelligent power amplifier, and improve the playing sound quality of the speaker.
Referring to fig. 1, fig. 1 is a flowchart illustrating a non-linearity compensation method for a speaker according to a first embodiment of the present invention. The nonlinear compensation method of the loudspeaker provided by the invention comprises the following steps:
s101: and carrying out attenuation processing on the original input signal at the current moment to generate a processed input signal.
In a specific implementation scenario, the original input signal is attenuated, the loudspeaker displacement response is adjusted, the output displacement of the loudspeaker is limited, and the processed input signal is obtained. This may keep the signal input to the loudspeaker below a certain limit. If the signal amplitude is too large, the speaker will produce non-linear distortion or will be irreparably damaged. One cause of this non-linear distortion or damage is excessive vibrational displacement of the diaphragm coil assembly of the loudspeaker. By carrying out attenuation processing on the original input signal, the amplitude of the signal can be effectively limited within a preset range, and at least partial characteristics of the original signal are reserved.
S102: and obtaining the loudspeaker state parameter and the loudspeaker system parameter at the current moment, and calculating a predistortion signal corresponding to the processed input signal according to the loudspeaker state parameter and the loudspeaker system parameter.
In this implementation scenario, the original input signal at the current time and the speaker output feedback signal at the current time may be obtained, and the speaker state parameter at the current time may be obtained according to the original input signal at the current time and the speaker output feedback signal at the current time. And calculating and processing the predistortion signal of the input signal according to the loudspeaker state parameter and the loudspeaker system parameter at the current moment.
The speaker system parameters may be set by the user or fixed values corresponding to each speaker. The loudspeaker system parameters comprise linear parameters and nonlinear parameters; the linear parameter comprises at least one item of voice coil vibration equivalent mass, voice coil direct current resistance, voice coil inductance, voice coil factor linearity, stiffness coefficient linearity and force resistance linearity; the non-linearity parameter includes at least one of a force factor, a stiffness coefficient, and a resistance to force.
S103: and acquiring system response parameters and frequency domain response parameters of the intelligent power amplifier, and filtering the pre-distortion signal according to the system response parameters to acquire a compensation signal.
In the implementation scene, the frequency response equalization is carried out on the predistortion signal, and the frequency response distortion of the intelligent power amplifier is compensated. Specifically, in a target frequency range, for example, 100HZ to 1000HZ, the frequency response of the smart power amplifier is not ideal, and the gain of different frequencies is different, so that the compensation effect may be affected if the predistortion signal is directly used for compensation. Therefore, the constructed system inverse Response is used for carrying out FIR (Finite Impulse Response) filtering operation on the predistortion signal to obtain a compensation signal, and the compensation signal can solve the problem of nonlinear compensation failure caused by nonlinear processing of the intelligent power amplifier.
Assuming that the system response parameter of the smart power amplifier is H, the frequency domain response parameter H of the smart power amplifier can be calculated according to the following formula:
Figure BDA0002537715950000041
constructing an inverse system response hinvMake its corresponding frequency domain response Hinv＝H-1According to the inverse system response hinvA compensation signal corresponding to the pre-distorted signal is obtained. Referring to fig. 2a and fig. 2b, fig. 2a is a schematic waveform diagram of a system response of the smart power amplifier provided by the present invention, and fig. 2b is a schematic waveform diagram of an inverse system response of the smart power amplifier provided by the present invention.
S104: and inputting the compensation signal into an intelligent power amplifier to obtain a playing signal, and inputting the playing signal into a loudspeaker.
In this implementation scenario, the compensation signal is input to the smart power amplifier, and the smart power amplifier adjusts the compensation signal according to a preset protection rule, such as amplitude protection, temperature protection, or according to a preset processing rule, such as changing voltage, changing current, and the like, to obtain a playing signal, and inputs the playing signal to the speaker, so that the quality of the audio output by the speaker is effectively improved.
As can be seen from the above description, in this embodiment, the original input signal is attenuated to obtain the processed input signal, the state parameter of the speaker at the current time is calculated according to the original input signal and the received feedback signal, the nonlinear distortion of the speaker is calculated according to the current state parameter of the speaker, and a corresponding predistortion signal is generated, frequency response equalization is performed on the predistortion signal to compensate the frequency response distortion of the smart power amplifier, so that the problem of nonlinear compensation failure caused by nonlinear processing of the smart power amplifier can be solved, and the playing tone quality of the speaker is improved.
Referring to fig. 3, fig. 3 is a flowchart illustrating a non-linearity compensation method for a speaker according to a second embodiment of the present invention. The nonlinear compensation method of the loudspeaker provided by the invention comprises the following steps:
s201: and obtaining the loudspeaker diaphragm displacement corresponding to the original input signal, and judging whether the loudspeaker diaphragm displacement exceeds the preset maximum displacement.
In this implementation scenario, the loudspeaker diaphragm displacement corresponding to the original input signal is obtained according to a nonlinear loudspeaker diaphragm displacement response function, where the nonlinear loudspeaker diaphragm displacement response function is the voice coil vibration equivalent mass m according to the linear parameter in the loudspeaker system parameterstVoice coil DC resistance ReLinear term of voice coil force factor b0Linear term of stiffness coefficient k0And the non-linear parameter factor Bl (x), the stiffness coefficient kt(x) Resistance to harmony Rm(v) And (4) calculating. An accurate prediction of diaphragm displacement for a non-linear loudspeaker can be made for a particular audio signal.
The method comprises the steps of obtaining the preset maximum displacement of a loudspeaker, judging whether the displacement of a diaphragm of the loudspeaker exceeds the preset maximum displacement, and if so, performing compression filtering processing on an original input signal at the current moment to avoid reducing tone quality and avoiding damaging the loudspeaker.
S202: and obtaining the attenuation coefficient of the current moment, performing compression filtering processing on the original input signal of the current moment according to the attenuation coefficient, and adjusting the loudspeaker displacement response.
In a specific implementation scenario, the signal transmission characteristic at the current time is an IIR (infinite impulse Response) filter of the second order, and the transmission function in the z-domain is as follows:
Figure BDA0002537715950000061
wherein σtIs the characteristic gain of the filter, b1And b2As a loudspeaker feedforward coefficient, a1And a2Is the loudspeaker feedback coefficient. Sigmat、b1、b2、a1、a2Can be calculated and obtained according to the current loudspeaker state parameters.
The loudspeaker displacement response can be matched with the vibration diaphragm displacement amplitude of the loudspeaker according to the signals after attenuation processing, and the quality of the audio output by the loudspeaker can be effectively improved.
S203: and acquiring signals loaded at two ends of the loudspeaker at the last moment of the current moment, and calculating the state parameters of the loudspeaker at the current moment according to the signals and the parameters of the loudspeaker system.
In this implementation scenario, the signals loaded at the two ends of the speaker at the previous time of the current time are obtained, for example, a voltage sensor is configured on the smart power amplifier, and the voltage signals at the two ends of the speaker are obtained through the voltage sensor. In other implementation scenarios, the predistortion signal at the previous moment and the power amplifier gain of the intelligent power amplifier at the current moment are obtained, and the signals loaded at the two ends of the loudspeaker at the previous moment are estimated according to the predistortion signal at the previous moment and the power amplifier gain of the intelligent power amplifier at the current moment. Specifically, the voltage signal applied across the speaker at the previous time at the present time is calculated according to the following formula:
ve(t)＝u(t)*g(t)
wherein u (t) is a predistortion signal at the last moment of the current moment, g (t) is the power amplifier gain of the intelligent power amplifier, and v (t) is the predistortion signal at the last moment of the current momenteAnd (t) is a voltage signal loaded at two ends of the loudspeaker at the last moment of the current moment.
S204: a predistortion signal corresponding to the processed input signal is calculated based on the speaker state parameter and the speaker system parameter.
In this implementation scenario, the speaker state parameter is x ═ i, x, v]TWherein i is the voice coil current, x is the diaphragm displacement, and v is the diaphragm velocity. The loudspeaker system parameters include a linearity parameter and a non-linearity parameter. The linear parameter comprises the equivalent mass m of the voice coil vibrationtVoice coil DC resistance ReVoice coil inductance LeLinear term of voice coil force factor b0Linear term of stiffness coefficient k0Linear term of sum force resistance r0. The non-linear parameters include force factor Bl (x), stiffness coefficient kt(x) Resistance to harmony Rm(v)。
The predistortion signal is calculated according to the following formula:
Figure BDA0002537715950000071
s205: and obtaining system response parameters and frequency domain response parameters of the intelligent power amplifier, and calculating a compensation signal corresponding to the predistortion signal according to the system response parameters and the frequency domain response parameters.
S206: and inputting the compensation signal into an intelligent power amplifier to obtain a playing signal, and inputting the playing signal into a loudspeaker.
In this implementation scenario, steps S204 to S205 are substantially the same as steps S103 to S104 in the first embodiment of the method for compensating for nonlinearity of a speaker provided by the present invention, and are not described herein again.
Referring to fig. 4a and 4b in combination, fig. 4a is a schematic diagram of a SPL (Sound pressure level) waveform using the method of the present embodiment, and fig. 4b is a schematic diagram of a THD (Total harmonic distortion) waveform using the method of the present embodiment.
As can be seen from the above description, in this embodiment, the attenuation coefficient at the current moment is obtained through calculation according to the current speaker state parameter, the speaker state parameter at the current moment is calculated according to the signals loaded at the two ends of the speaker at the previous moment and the speaker system parameter, the predistortion signal corresponding to the processed input signal is calculated according to the speaker state parameter and the speaker system parameter, the compensation signal corresponding to the predistortion signal is calculated according to the system response parameter and the frequency domain response parameter of the smart power amplifier, the nonlinear compensation can be performed on the speaker device including the smart power amplifier, and the playing tone quality of the speaker is improved.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a speaker device according to an embodiment of the present invention. The speaker device 10 is applied to a speaker apparatus including an intelligent power amplifier, and includes: the device comprises an offset processing module 11, a nonlinear module 12, a power amplifier balancing module 13 and an intelligent power amplifier module 14.
The offset processing module 11 is configured to perform attenuation processing on an original input signal at a current time to generate a processed input signal. The nonlinear module 12 is configured to obtain a speaker state parameter and a speaker system parameter at the current time, and calculate a predistortion signal corresponding to the processed input signal according to the speaker state parameter and the speaker system parameter. The power amplifier equalization module 13 is configured to obtain a system response parameter and a frequency domain response parameter of the intelligent power amplifier, and filter the predistortion signal according to the system response parameter to obtain a compensation signal. The intelligent power amplifier module 14 is used for inputting the compensation signal into the intelligent power amplifier, acquiring the playing signal, and inputting the playing signal into the loudspeaker.
The loudspeaker device 10 further includes an offset prediction module 15, configured to obtain a loudspeaker diaphragm displacement corresponding to the original input signal, and determine whether the loudspeaker diaphragm displacement exceeds a preset maximum displacement; and if the displacement of the loudspeaker diaphragm exceeds the preset maximum displacement, obtaining the attenuation coefficient at the current moment, and attenuating the original input signal at the current moment.
The offset processing module 11 is configured to obtain an attenuation coefficient at the current time, perform compression filtering processing on an original input signal at the current time according to the attenuation coefficient, and adjust a loudspeaker displacement response.
The power amplifier equalization module 13 is further configured to perform finite-length single-bit impulse response filtering on the predistortion signal.
The speaker apparatus 10 further includes a speaker model module 16, configured to obtain signals loaded at two ends of the speaker at a previous time of the current time, and calculate a speaker state parameter at the current time according to the signals and the speaker system parameters.
The speaker model module 16 is further configured to obtain the predistortion signal at the previous time of the current time and the power amplifier gain of the intelligent power amplifier, and estimate the signals loaded at the two ends of the speaker at the previous time of the current time according to the predistortion signal at the previous time of the current time and the power amplifier gain of the intelligent power amplifier.
Wherein the loudspeaker system parameters comprise linear parameters and nonlinear parameters; the linear parameter comprises at least one item of voice coil vibration equivalent mass, voice coil direct current resistance, voice coil inductance, voice coil factor linearity, stiffness coefficient linearity and force resistance linearity; the non-linearity parameter comprises at least one of a force factor, a stiffness coefficient and a mechanical resistance; the loudspeaker state parameter includes at least one of a voice coil current, a diaphragm displacement, and a diaphragm velocity.
It can be known from the above description that, the speaker device in this embodiment obtains the processing input signal by performing attenuation processing on the original input signal, calculates the speaker state parameter at the current moment according to the original input signal and the received feedback signal, calculates the nonlinear distortion of the speaker according to the current speaker state parameter, and generates a corresponding predistortion signal, performs frequency response equalization on the predistortion signal, compensates the frequency response distortion of the smart power amplifier, can perform nonlinear compensation on the speaker device including the smart power amplifier, and improves the playing tone quality of the speaker.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a speaker device provided in the present application. The touch terminal 20 includes a processor 21 and a memory 22. The processor 21 is coupled to a memory 22. The memory 22 has stored therein a computer program which is executed by the processor 21 in operation to implement the method as shown in fig. 1 and 3. The detailed methods can be referred to above and are not described herein.
It can be known from the above description that, in this embodiment, the speaker device performs attenuation processing on the original input signal to obtain the processed input signal, calculates the speaker state parameter at the current moment according to the original input signal and the received feedback signal, calculates the nonlinear distortion of the speaker according to the current speaker state parameter, and generates a corresponding predistortion signal, performs frequency response equalization on the predistortion signal, compensates the frequency response distortion of the smart power amplifier, can perform nonlinear compensation on the speaker device including the smart power amplifier, and improves the playing tone quality of the speaker.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a storage medium according to an embodiment of the present disclosure. The storage medium 30 stores at least one computer program 31, and the computer program 31 is used for being executed by a processor to implement the method shown in fig. 1 and fig. 3, and the detailed method can be referred to above and is not described herein again. In one embodiment, the storage medium 30 may be a memory chip in a terminal, a hard disk or other storage writing tool such as a mobile hard disk or a flash disk, an optical disk, or the like, and may also be a server or the like.
As can be seen from the above description, the computer program in the storage medium in this embodiment may be configured to perform attenuation processing on an original input signal, obtain a processed input signal, calculate a speaker state parameter at a current moment according to the original input signal and an accepted feedback signal, calculate nonlinear distortion of a speaker according to the current speaker state parameter, generate a corresponding predistortion signal, perform frequency response equalization on the predistortion signal, compensate for frequency response distortion of an intelligent power amplifier, perform nonlinear compensation on speaker equipment including the intelligent power amplifier, and improve the playing tone quality of the speaker.
Different from the prior art, the invention considers the nonlinear distortion in the actual work of the loudspeaker and also considers the nonlinear problem processed by the intelligent power amplifier, reasonably predicts the compensation signal, can carry out nonlinear compensation on the loudspeaker equipment comprising the intelligent power amplifier, and improves the playing tone quality of the loudspeaker.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims (10)

1. A nonlinear compensation method of a loudspeaker is applied to loudspeaker equipment comprising an intelligent power amplifier, and comprises the following steps:
performing attenuation processing on an original input signal at the current moment to generate a processed input signal;
obtaining a loudspeaker state parameter and a loudspeaker system parameter at the current moment, and calculating a predistortion signal corresponding to the processing input signal according to the loudspeaker state parameter and the loudspeaker system parameter;
acquiring system response parameters and frequency domain response parameters of the intelligent power amplifier, and filtering the pre-distortion signal according to the system response parameters to acquire a compensation signal;
and inputting the compensation signal into the intelligent power amplifier to obtain a playing signal, and inputting the playing signal into a loudspeaker.
2. The method of claim 1, wherein the step of attenuating the original input signal at the current time comprises:
obtaining loudspeaker diaphragm displacement corresponding to the original input signal, and judging whether the loudspeaker diaphragm displacement exceeds a preset maximum displacement;
and if the loudspeaker diaphragm displacement exceeds the preset maximum displacement, obtaining the attenuation coefficient at the current moment, and attenuating the original input signal at the current moment.
3. The method of claim 2, wherein the step of obtaining the attenuation coefficient at the current time comprises:
and obtaining the attenuation coefficient at the current moment according to the filter gain characteristic, the feedforward coefficient and the feedback coefficient of the loudspeaker.
4. The method of claim 1, wherein the step of filtering the pre-distorted signal comprises:
and carrying out finite-length unit impulse response filtering on the predistortion signal.
5. The method of claim 1, wherein the speaker system parameters include a linearity parameter and a non-linearity parameter;
the linear parameter comprises at least one of voice coil vibration equivalent mass, voice coil direct current resistance, voice coil inductance, voice coil factor linearity, stiffness coefficient linearity term and force resistance linearity term;
the non-linearity parameter comprises at least one of a force factor, a stiffness coefficient and a resistance to force;
the loudspeaker state parameter includes at least one of a voice coil current, a diaphragm displacement, and a diaphragm velocity.
6. The method of claim 1, wherein the step of determining the speaker state parameter at the current time comprises:
and obtaining signals loaded at two ends of the loudspeaker at the last moment of the current moment, and calculating the loudspeaker state parameter at the current moment according to the signals and the loudspeaker system parameters.
7. The method of claim 6, wherein the step of obtaining the signals loaded at two ends of the speaker at the previous moment of the current moment comprises:
and estimating signals loaded at two ends of a loudspeaker at the last moment according to the predistortion signal at the last moment and the power amplifier gain of the intelligent power amplifier.
8. A speaker device, for speaker equipment including a smart power amplifier, comprising:
the offset processing module is used for carrying out attenuation processing on the original input signal at the current moment to generate a processed input signal;
the nonlinear module is used for acquiring the loudspeaker state parameter and the loudspeaker system parameter at the current moment, and calculating a predistortion signal corresponding to the processing input signal according to the loudspeaker state parameter and the loudspeaker system parameter;
the power amplifier equalization module is used for acquiring a system response parameter and a frequency domain response parameter of the intelligent power amplifier, and filtering the predistortion signal according to the system response parameter to acquire a compensation signal;
and the intelligent power amplifier module is used for inputting the compensation signal into the intelligent power amplifier, acquiring a playing signal and inputting the playing signal into a loudspeaker.
9. A speaker apparatus, comprising: a processor coupled to the memory and a memory having a computer program stored therein, the processor executing the computer program to implement the method of any of claims 1-7.
10. A readable storage medium, in which a computer program is stored, which computer program is executable by a processor to implement the method according to any one of claims 1-7.
CN202010537957.5A 2020-06-12 2020-06-12 Method for compensating for non-linearity of speaker, speaker apparatus, device, and storage medium Pending CN111741409A (en)

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